11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * INET An implementation of the TCP/IP protocol suite for the LINUX 31da177e4SLinus Torvalds * operating system. INET is implemented using the BSD Socket 41da177e4SLinus Torvalds * interface as the means of communication with the user level. 51da177e4SLinus Torvalds * 61da177e4SLinus Torvalds * Checksumming functions for IPv6 71da177e4SLinus Torvalds * 81da177e4SLinus Torvalds * Authors: Jorge Cwik, <jorge@laser.satlink.net> 91da177e4SLinus Torvalds * Arnt Gulbrandsen, <agulbra@nvg.unit.no> 101da177e4SLinus Torvalds * Borrows very liberally from tcp.c and ip.c, see those 111da177e4SLinus Torvalds * files for more names. 121da177e4SLinus Torvalds * 131da177e4SLinus Torvalds * This program is free software; you can redistribute it and/or 141da177e4SLinus Torvalds * modify it under the terms of the GNU General Public License 151da177e4SLinus Torvalds * as published by the Free Software Foundation; either version 161da177e4SLinus Torvalds * 2 of the License, or (at your option) any later version. 171da177e4SLinus Torvalds */ 181da177e4SLinus Torvalds 191da177e4SLinus Torvalds /* 201da177e4SLinus Torvalds * Fixes: 211da177e4SLinus Torvalds * 221da177e4SLinus Torvalds * Ralf Baechle : generic ipv6 checksum 231da177e4SLinus Torvalds * <ralf@waldorf-gmbh.de> 241da177e4SLinus Torvalds */ 251da177e4SLinus Torvalds 261da177e4SLinus Torvalds #ifndef _CHECKSUM_IPV6_H 271da177e4SLinus Torvalds #define _CHECKSUM_IPV6_H 281da177e4SLinus Torvalds 291da177e4SLinus Torvalds #include <asm/types.h> 301da177e4SLinus Torvalds #include <asm/byteorder.h> 311da177e4SLinus Torvalds #include <net/ip.h> 321da177e4SLinus Torvalds #include <asm/checksum.h> 331da177e4SLinus Torvalds #include <linux/in6.h> 348663e02aSVlad Yasevich #include <linux/tcp.h> 358663e02aSVlad Yasevich #include <linux/ipv6.h> 361da177e4SLinus Torvalds 371da177e4SLinus Torvalds #ifndef _HAVE_ARCH_IPV6_CSUM 38*acb3e041SCong Wang __sum16 csum_ipv6_magic(const struct in6_addr *saddr, 3956649d5dSAl Viro const struct in6_addr *daddr, 4056649d5dSAl Viro __u32 len, unsigned short proto, 41*acb3e041SCong Wang __wsum csum); 421da177e4SLinus Torvalds #endif 438663e02aSVlad Yasevich 448663e02aSVlad Yasevich static __inline__ __sum16 tcp_v6_check(int len, 458663e02aSVlad Yasevich const struct in6_addr *saddr, 468663e02aSVlad Yasevich const struct in6_addr *daddr, 478663e02aSVlad Yasevich __wsum base) 488663e02aSVlad Yasevich { 498663e02aSVlad Yasevich return csum_ipv6_magic(saddr, daddr, len, IPPROTO_TCP, base); 508663e02aSVlad Yasevich } 518663e02aSVlad Yasevich 528663e02aSVlad Yasevich static inline void __tcp_v6_send_check(struct sk_buff *skb, 538663e02aSVlad Yasevich const struct in6_addr *saddr, 548663e02aSVlad Yasevich const struct in6_addr *daddr) 558663e02aSVlad Yasevich { 568663e02aSVlad Yasevich struct tcphdr *th = tcp_hdr(skb); 578663e02aSVlad Yasevich 588663e02aSVlad Yasevich if (skb->ip_summed == CHECKSUM_PARTIAL) { 598663e02aSVlad Yasevich th->check = ~tcp_v6_check(skb->len, saddr, daddr, 0); 608663e02aSVlad Yasevich skb->csum_start = skb_transport_header(skb) - skb->head; 618663e02aSVlad Yasevich skb->csum_offset = offsetof(struct tcphdr, check); 628663e02aSVlad Yasevich } else { 638663e02aSVlad Yasevich th->check = tcp_v6_check(skb->len, saddr, daddr, 648663e02aSVlad Yasevich csum_partial(th, th->doff << 2, 658663e02aSVlad Yasevich skb->csum)); 668663e02aSVlad Yasevich } 678663e02aSVlad Yasevich } 688663e02aSVlad Yasevich 698663e02aSVlad Yasevich static inline void tcp_v6_send_check(struct sock *sk, struct sk_buff *skb) 708663e02aSVlad Yasevich { 718663e02aSVlad Yasevich struct ipv6_pinfo *np = inet6_sk(sk); 728663e02aSVlad Yasevich 738663e02aSVlad Yasevich __tcp_v6_send_check(skb, &np->saddr, &np->daddr); 748663e02aSVlad Yasevich } 758663e02aSVlad Yasevich 76*acb3e041SCong Wang int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh, int proto); 771da177e4SLinus Torvalds #endif 78