diff options
Diffstat (limited to 'pfinet/linux-src/include/net/checksum.h')
| -rw-r--r-- | pfinet/linux-src/include/net/checksum.h | 110 |
1 files changed, 110 insertions, 0 deletions
diff --git a/pfinet/linux-src/include/net/checksum.h b/pfinet/linux-src/include/net/checksum.h new file mode 100644 index 00000000..041d4760 --- /dev/null +++ b/pfinet/linux-src/include/net/checksum.h @@ -0,0 +1,110 @@ +/* + * INET An implementation of the TCP/IP protocol suite for the LINUX + * operating system. INET is implemented using the BSD Socket + * interface as the means of communication with the user level. + * + * Checksumming functions for IP, TCP, UDP and so on + * + * Authors: Jorge Cwik, <jorge@laser.satlink.net> + * Arnt Gulbrandsen, <agulbra@nvg.unit.no> + * Borrows very liberally from tcp.c and ip.c, see those + * files for more names. + * + * This program 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 of the License, or (at your option) any later version. + */ + +/* + * Fixes: + * + * Ralf Baechle : generic ipv6 checksum + * <ralf@waldorf-gmbh.de> + */ + +#ifndef _CHECKSUM_H +#define _CHECKSUM_H + +#include <asm/types.h> +#include <asm/byteorder.h> +#include <net/ip.h> +#include <asm/uaccess.h> +#include <asm/checksum.h> + +#ifndef _HAVE_ARCH_IPV6_CSUM + +static __inline__ unsigned short int csum_ipv6_magic(struct in6_addr *saddr, + struct in6_addr *daddr, + __u16 len, + unsigned short proto, + unsigned int csum) +{ + + int carry; + __u32 ulen; + __u32 uproto; + + csum += saddr->s6_addr32[0]; + carry = (csum < saddr->s6_addr32[0]); + csum += carry; + + csum += saddr->s6_addr32[1]; + carry = (csum < saddr->s6_addr32[1]); + csum += carry; + + csum += saddr->s6_addr32[2]; + carry = (csum < saddr->s6_addr32[2]); + csum += carry; + + csum += saddr->s6_addr32[3]; + carry = (csum < saddr->s6_addr32[3]); + csum += carry; + + csum += daddr->s6_addr32[0]; + carry = (csum < daddr->s6_addr32[0]); + csum += carry; + + csum += daddr->s6_addr32[1]; + carry = (csum < daddr->s6_addr32[1]); + csum += carry; + + csum += daddr->s6_addr32[2]; + carry = (csum < daddr->s6_addr32[2]); + csum += carry; + + csum += daddr->s6_addr32[3]; + carry = (csum < daddr->s6_addr32[3]); + csum += carry; + + ulen = htonl((__u32) len); + csum += ulen; + carry = (csum < ulen); + csum += carry; + + uproto = htonl(proto); + csum += uproto; + carry = (csum < uproto); + csum += carry; + + return csum_fold(csum); +} + +#endif + +#ifndef _HAVE_ARCH_COPY_AND_CSUM_FROM_USER +extern __inline__ +unsigned int csum_and_copy_from_user (const char *src, char *dst, + int len, int sum, int *err_ptr) +{ + if (verify_area(VERIFY_READ, src, len) == 0) + return csum_partial_copy_from_user(src, dst, len, sum, err_ptr); + + if (len) + *err_ptr = -EFAULT; + + return sum; +} +#endif + +#endif |