| 1 |
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| 2 | |
| 3 | * INET An implementation of the TCP/IP protocol suite for the LINUX
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| 4 | * operating system. INET is implemented using the BSD Socket
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| 5 | * interface as the means of communication with the user level.
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| 6 | *
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| 7 | * Checksumming functions for IPv6
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| 8 | *
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| 9 | * Authors: Jorge Cwik, <[email protected]>
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| 10 | * Arnt Gulbrandsen, <[email protected]>
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| 11 | * Borrows very liberally from tcp.c and ip.c, see those
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| 12 | * files for more names.
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| 13 |
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| 14 |
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| 15 | |
| 16 | * Fixes:
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| 17 | *
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| 18 | * Ralf Baechle : generic ipv6 checksum
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| 19 | * <[email protected]>
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| 20 |
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| 21 |
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| 22 | #ifndef _CHECKSUM_IPV6_H
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| 23 | #define _CHECKSUM_IPV6_H
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| 24 |
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| 25 | #include <asm/types.h>
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| 26 | #include <asm/byteorder.h>
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| 27 | #include <net/ip.h>
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| 28 | #include <asm/checksum.h>
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| 29 | #include <linux/in6.h>
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| 30 | #include <linux/tcp.h>
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| 31 | #include <linux/ipv6.h>
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| 32 |
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| 33 | #ifndef _HAVE_ARCH_IPV6_CSUM
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| 34 | __sum16 csum_ipv6_magic(const struct in6_addr *saddr,
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| 35 | const struct in6_addr *daddr,
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| 36 | __u32 len, __u8 proto, __wsum csum);
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| 37 | #endif
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| 38 |
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| 39 | static inline __wsum ip6_compute_pseudo(struct sk_buff *skb, int proto)
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| 40 | {
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| 41 | return ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
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| 42 | &ipv6_hdr(skb)->daddr,
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| 43 | skb->len, proto, 0));
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| 44 | }
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| 45 |
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| 46 | static __inline__ __sum16 tcp_v6_check(int len,
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| 47 | const struct in6_addr *saddr,
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| 48 | const struct in6_addr *daddr,
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| 49 | __wsum base)
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| 50 | {
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| 51 | return csum_ipv6_magic(saddr, daddr, len, IPPROTO_TCP, base);
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| 52 | }
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| 53 |
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| 54 | static inline void __tcp_v6_send_check(struct sk_buff *skb,
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| 55 | const struct in6_addr *saddr,
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| 56 | const struct in6_addr *daddr)
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| 57 | {
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| 58 | struct tcphdr *th = tcp_hdr(skb);
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| 59 |
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| 60 | th->check = ~tcp_v6_check(skb->len, saddr, daddr, 0);
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| 61 | skb->csum_start = skb_transport_header(skb) - skb->head;
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| 62 | skb->csum_offset = offsetof(struct tcphdr, check);
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| 63 | }
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| 64 |
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| 65 | static inline void tcp_v6_gso_csum_prep(struct sk_buff *skb)
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| 66 | {
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| 67 | struct ipv6hdr *ipv6h = ipv6_hdr(skb);
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| 68 | struct tcphdr *th = tcp_hdr(skb);
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| 69 |
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| 70 | ipv6h->payload_len = 0;
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| 71 | th->check = ~tcp_v6_check(0, &ipv6h->saddr, &ipv6h->daddr, 0);
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| 72 | }
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| 73 |
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| 74 | static inline __sum16 udp_v6_check(int len,
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| 75 | const struct in6_addr *saddr,
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| 76 | const struct in6_addr *daddr,
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| 77 | __wsum base)
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| 78 | {
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| 79 | return csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, base);
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| 80 | }
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| 81 |
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| 82 | void udp6_set_csum(bool nocheck, struct sk_buff *skb,
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| 83 | const struct in6_addr *saddr,
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| 84 | const struct in6_addr *daddr, int len);
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| 85 | #endif
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