projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 2874c5fd | 1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
| 1da177e4 LT |
2 | /* |
| 3 | * INET An implementation of the TCP/IP protocol suite for the LINUX | |
| 4 | * operating system. INET is implemented using the BSD Socket | |
| 5 | * interface as the means of communication with the user level. | |
| 6 | * | |
| 7 | * Checksumming functions for IPv6 | |
| 8 | * | |
| 9 | * Authors: Jorge Cwik, <jorge@laser.satlink.net> | |
| 10 | * Arnt Gulbrandsen, <agulbra@nvg.unit.no> | |
| 11 | * Borrows very liberally from tcp.c and ip.c, see those | |
| 12 | * files for more names. | |
| 1da177e4 LT |
13 | */ |
| 14 | ||
| 15 | /* | |
| 16 | * Fixes: | |
| 17 | * | |
| 18 | * Ralf Baechle : generic ipv6 checksum | |
| 19 | * <ralf@waldorf-gmbh.de> | |
| 20 | */ | |
| 21 | ||
| 22 | #ifndef _CHECKSUM_IPV6_H | |
| 23 | #define _CHECKSUM_IPV6_H | |
| 24 | ||
| 25 | #include <asm/types.h> | |
| 26 | #include <asm/byteorder.h> | |
| 27 | #include <net/ip.h> | |
| 28 | #include <asm/checksum.h> | |
| 29 | #include <linux/in6.h> | |
| 8663e02a VY |
30 | #include <linux/tcp.h> |
| 31 | #include <linux/ipv6.h> | |
| 1da177e4 LT |
32 | |
| 33 | #ifndef _HAVE_ARCH_IPV6_CSUM | |
| acb3e041 CW |
34 | __sum16 csum_ipv6_magic(const struct in6_addr *saddr, |
| 35 | const struct in6_addr *daddr, | |
| 1e940829 | 36 | __u32 len, __u8 proto, __wsum csum); |
| 1da177e4 | 37 | #endif |
| 8663e02a | 38 | |
| e4f45b7f TH |
39 | static inline __wsum ip6_compute_pseudo(struct sk_buff *skb, int proto) |
| 40 | { | |
| 41 | return ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr, | |
| 42 | &ipv6_hdr(skb)->daddr, | |
| 43 | skb->len, proto, 0)); | |
| 44 | } | |
| 45 | ||
| 8663e02a VY |
46 | static __inline__ __sum16 tcp_v6_check(int len, |
| 47 | const struct in6_addr *saddr, | |
| 48 | const struct in6_addr *daddr, | |
| 49 | __wsum base) | |
| 50 | { | |
| 51 | return csum_ipv6_magic(saddr, daddr, len, IPPROTO_TCP, base); | |
| 52 | } | |
| 53 | ||
| 54 | static inline void __tcp_v6_send_check(struct sk_buff *skb, | |
| 55 | const struct in6_addr *saddr, | |
| 56 | const struct in6_addr *daddr) | |
| 57 | { | |
| 58 | struct tcphdr *th = tcp_hdr(skb); | |
| 59 | ||
| 283c6b54 ED |
60 | th->check = ~tcp_v6_check(skb->len, saddr, daddr, 0); |
| 61 | skb->csum_start = skb_transport_header(skb) - skb->head; | |
| 62 | skb->csum_offset = offsetof(struct tcphdr, check); | |
| 8663e02a VY |
63 | } |
| 64 | ||
| 76eeb12b HK |
65 | static inline void tcp_v6_gso_csum_prep(struct sk_buff *skb) |
| 66 | { | |
| 67 | struct ipv6hdr *ipv6h = ipv6_hdr(skb); | |
| 68 | struct tcphdr *th = tcp_hdr(skb); | |
| 69 | ||
| 70 | ipv6h->payload_len = 0; | |
| 71 | th->check = ~tcp_v6_check(0, &ipv6h->saddr, &ipv6h->daddr, 0); | |
| 72 | } | |
| 73 | ||
| af5fcba7 TH |
74 | static inline __sum16 udp_v6_check(int len, |
| 75 | const struct in6_addr *saddr, | |
| 76 | const struct in6_addr *daddr, | |
| 77 | __wsum base) | |
| 78 | { | |
| 79 | return csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, base); | |
| 80 | } | |
| 81 | ||
| 82 | void udp6_set_csum(bool nocheck, struct sk_buff *skb, | |
| 83 | const struct in6_addr *saddr, | |
| 84 | const struct in6_addr *daddr, int len); | |
| 85 | ||
| acb3e041 | 86 | int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh, int proto); |
| 1da177e4 | 87 | #endif |