diff options
Diffstat (limited to 'arch/s390/include/asm/checksum.h')
| -rw-r--r-- | arch/s390/include/asm/checksum.h | 105 |
1 files changed, 61 insertions, 44 deletions
diff --git a/arch/s390/include/asm/checksum.h b/arch/s390/include/asm/checksum.h index 6813bfa1eeb7..a8c02cfbc712 100644 --- a/arch/s390/include/asm/checksum.h +++ b/arch/s390/include/asm/checksum.h @@ -13,21 +13,21 @@ #define _S390_CHECKSUM_H #include <linux/uaccess.h> +#include <linux/in6.h> /* - * computes the checksum of a memory block at buff, length len, - * and adds in "sum" (32-bit) + * 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 + * 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 + * 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 + * It's best to have buff aligned on a 32-bit boundary. */ -static inline __wsum -csum_partial(const void *buff, int len, __wsum sum) +static inline __wsum csum_partial(const void *buff, int len, __wsum sum) { register unsigned long reg2 asm("2") = (unsigned long) buff; register unsigned long reg3 asm("3") = (unsigned long) len; @@ -40,74 +40,91 @@ csum_partial(const void *buff, int len, __wsum sum) } /* - * Fold a partial checksum without adding pseudo headers + * Fold a partial checksum without adding pseudo headers. */ static inline __sum16 csum_fold(__wsum sum) { u32 csum = (__force u32) sum; - csum += (csum >> 16) + (csum << 16); + csum += (csum >> 16) | (csum << 16); csum >>= 16; return (__force __sum16) ~csum; } /* - * This is a version of ip_compute_csum() optimized for IP headers, - * which always checksum on 4 octet boundaries. - * + * This is a version of ip_compute_csum() optimized for IP headers, + * which always checksums on 4 octet boundaries. */ static inline __sum16 ip_fast_csum(const void *iph, unsigned int ihl) { - return csum_fold(csum_partial(iph, ihl*4, 0)); + __u64 csum = 0; + __u32 *ptr = (u32 *)iph; + + csum += *ptr++; + csum += *ptr++; + csum += *ptr++; + csum += *ptr++; + ihl -= 4; + while (ihl--) + csum += *ptr++; + csum += (csum >> 32) | (csum << 32); + return csum_fold((__force __wsum)(csum >> 32)); } /* - * computes the checksum of the TCP/UDP pseudo-header - * returns a 32-bit checksum + * Computes the checksum of the TCP/UDP pseudo-header. + * Returns a 32-bit checksum. */ -static inline __wsum -csum_tcpudp_nofold(__be32 saddr, __be32 daddr, __u32 len, __u8 proto, - __wsum sum) +static inline __wsum csum_tcpudp_nofold(__be32 saddr, __be32 daddr, __u32 len, + __u8 proto, __wsum sum) { - __u32 csum = (__force __u32)sum; + __u64 csum = (__force __u64)sum; csum += (__force __u32)saddr; - if (csum < (__force __u32)saddr) - csum++; - csum += (__force __u32)daddr; - if (csum < (__force __u32)daddr) - csum++; - - csum += len + proto; - if (csum < len + proto) - csum++; - - return (__force __wsum)csum; + csum += len; + csum += proto; + csum += (csum >> 32) | (csum << 32); + return (__force __wsum)(csum >> 32); } /* - * computes the checksum of the TCP/UDP pseudo-header - * returns a 16-bit checksum, already complemented + * Computes the checksum of the TCP/UDP pseudo-header. + * Returns a 16-bit checksum, already complemented. */ - -static inline __sum16 -csum_tcpudp_magic(__be32 saddr, __be32 daddr, __u32 len, __u8 proto, - __wsum sum) +static inline __sum16 csum_tcpudp_magic(__be32 saddr, __be32 daddr, __u32 len, + __u8 proto, __wsum sum) { - return csum_fold(csum_tcpudp_nofold(saddr,daddr,len,proto,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 + * Used for miscellaneous IP-like checksums, mainly icmp. */ - static inline __sum16 ip_compute_csum(const void *buff, int len) { return csum_fold(csum_partial(buff, len, 0)); } -#endif /* _S390_CHECKSUM_H */ - +#define _HAVE_ARCH_IPV6_CSUM +static inline __sum16 csum_ipv6_magic(const struct in6_addr *saddr, + const struct in6_addr *daddr, + __u32 len, __u8 proto, __wsum csum) +{ + __u64 sum = (__force __u64)csum; + + sum += (__force __u32)saddr->s6_addr32[0]; + sum += (__force __u32)saddr->s6_addr32[1]; + sum += (__force __u32)saddr->s6_addr32[2]; + sum += (__force __u32)saddr->s6_addr32[3]; + sum += (__force __u32)daddr->s6_addr32[0]; + sum += (__force __u32)daddr->s6_addr32[1]; + sum += (__force __u32)daddr->s6_addr32[2]; + sum += (__force __u32)daddr->s6_addr32[3]; + sum += len; + sum += proto; + sum += (sum >> 32) | (sum << 32); + return csum_fold((__force __wsum)(sum >> 32)); +} +#endif /* _S390_CHECKSUM_H */ |