1 /* SPDX-License-Identifier: GPL-2.0-or-later * 1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /* 2 /*
3 * INET An implementation of the TCP/I 3 * INET An implementation of the TCP/IP protocol suite for the LINUX
4 * operating system. INET is imp 4 * operating system. INET is implemented using the BSD Socket
5 * interface as the means of comm 5 * interface as the means of communication with the user level.
6 * 6 *
7 * Checksumming functions for IPv 7 * Checksumming functions for IPv6
8 * 8 *
9 * Authors: Jorge Cwik, <jorge@laser.satli 9 * Authors: Jorge Cwik, <jorge@laser.satlink.net>
10 * Arnt Gulbrandsen, <agulbra@nvg 10 * Arnt Gulbrandsen, <agulbra@nvg.unit.no>
11 * Borrows very liberally from tc 11 * Borrows very liberally from tcp.c and ip.c, see those
12 * files for more names. 12 * files for more names.
13 */ 13 */
14 14
15 /* 15 /*
16 * Fixes: 16 * Fixes:
17 * 17 *
18 * Ralf Baechle : 18 * Ralf Baechle : generic ipv6 checksum
19 * <ralf@waldorf-gmbh.de> 19 * <ralf@waldorf-gmbh.de>
20 */ 20 */
21 21
22 #ifndef _CHECKSUM_IPV6_H 22 #ifndef _CHECKSUM_IPV6_H
23 #define _CHECKSUM_IPV6_H 23 #define _CHECKSUM_IPV6_H
24 24
25 #include <asm/types.h> 25 #include <asm/types.h>
26 #include <asm/byteorder.h> 26 #include <asm/byteorder.h>
27 #include <net/ip.h> 27 #include <net/ip.h>
28 #include <asm/checksum.h> 28 #include <asm/checksum.h>
29 #include <linux/in6.h> 29 #include <linux/in6.h>
30 #include <linux/tcp.h> 30 #include <linux/tcp.h>
31 #include <linux/ipv6.h> 31 #include <linux/ipv6.h>
32 32
33 #ifndef _HAVE_ARCH_IPV6_CSUM 33 #ifndef _HAVE_ARCH_IPV6_CSUM
34 __sum16 csum_ipv6_magic(const struct in6_addr 34 __sum16 csum_ipv6_magic(const struct in6_addr *saddr,
35 const struct in6_addr 35 const struct in6_addr *daddr,
36 __u32 len, __u8 proto, 36 __u32 len, __u8 proto, __wsum csum);
37 #endif 37 #endif
38 38
39 static inline __wsum ip6_compute_pseudo(struct 39 static inline __wsum ip6_compute_pseudo(struct sk_buff *skb, int proto)
40 { 40 {
41 return ~csum_unfold(csum_ipv6_magic(&i 41 return ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
42 &i 42 &ipv6_hdr(skb)->daddr,
43 sk 43 skb->len, proto, 0));
44 } 44 }
45 45
46 static __inline__ __sum16 tcp_v6_check(int len 46 static __inline__ __sum16 tcp_v6_check(int len,
47 const struc 47 const struct in6_addr *saddr,
48 const struc 48 const struct in6_addr *daddr,
49 __wsum base 49 __wsum base)
50 { 50 {
51 return csum_ipv6_magic(saddr, daddr, l 51 return csum_ipv6_magic(saddr, daddr, len, IPPROTO_TCP, base);
52 } 52 }
53 53
54 static inline void __tcp_v6_send_check(struct 54 static inline void __tcp_v6_send_check(struct sk_buff *skb,
55 const s 55 const struct in6_addr *saddr,
56 const s 56 const struct in6_addr *daddr)
57 { 57 {
58 struct tcphdr *th = tcp_hdr(skb); 58 struct tcphdr *th = tcp_hdr(skb);
59 59
60 th->check = ~tcp_v6_check(skb->len, sa 60 th->check = ~tcp_v6_check(skb->len, saddr, daddr, 0);
61 skb->csum_start = skb_transport_header 61 skb->csum_start = skb_transport_header(skb) - skb->head;
62 skb->csum_offset = offsetof(struct tcp 62 skb->csum_offset = offsetof(struct tcphdr, check);
63 } 63 }
64 64
65 static inline void tcp_v6_gso_csum_prep(struct 65 static inline void tcp_v6_gso_csum_prep(struct sk_buff *skb)
66 { 66 {
67 struct ipv6hdr *ipv6h = ipv6_hdr(skb); 67 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
68 struct tcphdr *th = tcp_hdr(skb); 68 struct tcphdr *th = tcp_hdr(skb);
69 69
70 ipv6h->payload_len = 0; 70 ipv6h->payload_len = 0;
71 th->check = ~tcp_v6_check(0, &ipv6h->s 71 th->check = ~tcp_v6_check(0, &ipv6h->saddr, &ipv6h->daddr, 0);
72 } 72 }
73 73
74 static inline __sum16 udp_v6_check(int len, 74 static inline __sum16 udp_v6_check(int len,
75 const struc 75 const struct in6_addr *saddr,
76 const struc 76 const struct in6_addr *daddr,
77 __wsum base 77 __wsum base)
78 { 78 {
79 return csum_ipv6_magic(saddr, daddr, l 79 return csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, base);
80 } 80 }
81 81
82 void udp6_set_csum(bool nocheck, struct sk_buf 82 void udp6_set_csum(bool nocheck, struct sk_buff *skb,
83 const struct in6_addr *sadd 83 const struct in6_addr *saddr,
84 const struct in6_addr *dadd 84 const struct in6_addr *daddr, int len);
85 85
86 int udp6_csum_init(struct sk_buff *skb, struct 86 int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh, int proto);
87 #endif 87 #endif
88 88
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