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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
acb3e041 CW |
2 | #include <net/ip.h> |
3 | #include <net/udp.h> | |
4 | #include <net/udplite.h> | |
5 | #include <asm/checksum.h> | |
6 | ||
7 | #ifndef _HAVE_ARCH_IPV6_CSUM | |
8 | __sum16 csum_ipv6_magic(const struct in6_addr *saddr, | |
9 | const struct in6_addr *daddr, | |
1e940829 | 10 | __u32 len, __u8 proto, __wsum csum) |
acb3e041 CW |
11 | { |
12 | ||
13 | int carry; | |
14 | __u32 ulen; | |
15 | __u32 uproto; | |
16 | __u32 sum = (__force u32)csum; | |
17 | ||
18 | sum += (__force u32)saddr->s6_addr32[0]; | |
19 | carry = (sum < (__force u32)saddr->s6_addr32[0]); | |
20 | sum += carry; | |
21 | ||
22 | sum += (__force u32)saddr->s6_addr32[1]; | |
23 | carry = (sum < (__force u32)saddr->s6_addr32[1]); | |
24 | sum += carry; | |
25 | ||
26 | sum += (__force u32)saddr->s6_addr32[2]; | |
27 | carry = (sum < (__force u32)saddr->s6_addr32[2]); | |
28 | sum += carry; | |
29 | ||
30 | sum += (__force u32)saddr->s6_addr32[3]; | |
31 | carry = (sum < (__force u32)saddr->s6_addr32[3]); | |
32 | sum += carry; | |
33 | ||
34 | sum += (__force u32)daddr->s6_addr32[0]; | |
35 | carry = (sum < (__force u32)daddr->s6_addr32[0]); | |
36 | sum += carry; | |
37 | ||
38 | sum += (__force u32)daddr->s6_addr32[1]; | |
39 | carry = (sum < (__force u32)daddr->s6_addr32[1]); | |
40 | sum += carry; | |
41 | ||
42 | sum += (__force u32)daddr->s6_addr32[2]; | |
43 | carry = (sum < (__force u32)daddr->s6_addr32[2]); | |
44 | sum += carry; | |
45 | ||
46 | sum += (__force u32)daddr->s6_addr32[3]; | |
47 | carry = (sum < (__force u32)daddr->s6_addr32[3]); | |
48 | sum += carry; | |
49 | ||
50 | ulen = (__force u32)htonl((__u32) len); | |
51 | sum += ulen; | |
52 | carry = (sum < ulen); | |
53 | sum += carry; | |
54 | ||
55 | uproto = (__force u32)htonl(proto); | |
56 | sum += uproto; | |
57 | carry = (sum < uproto); | |
58 | sum += carry; | |
59 | ||
60 | return csum_fold((__force __wsum)sum); | |
61 | } | |
62 | EXPORT_SYMBOL(csum_ipv6_magic); | |
63 | #endif | |
64 | ||
65 | int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh, int proto) | |
66 | { | |
67 | int err; | |
68 | ||
69 | UDP_SKB_CB(skb)->partial_cov = 0; | |
70 | UDP_SKB_CB(skb)->cscov = skb->len; | |
71 | ||
72 | if (proto == IPPROTO_UDPLITE) { | |
73 | err = udplite_checksum_init(skb, uh); | |
74 | if (err) | |
75 | return err; | |
76 | } | |
77 | ||
4068579e TH |
78 | /* To support RFC 6936 (allow zero checksum in UDP/IPV6 for tunnels) |
79 | * we accept a checksum of zero here. When we find the socket | |
80 | * for the UDP packet we'll check if that socket allows zero checksum | |
81 | * for IPv6 (set by socket option). | |
c148d163 HFS |
82 | * |
83 | * Note, we are only interested in != 0 or == 0, thus the | |
84 | * force to int. | |
4068579e | 85 | */ |
c148d163 HFS |
86 | return (__force int)skb_checksum_init_zero_check(skb, proto, uh->check, |
87 | ip6_compute_pseudo); | |
acb3e041 CW |
88 | } |
89 | EXPORT_SYMBOL(udp6_csum_init); | |
af5fcba7 TH |
90 | |
91 | /* Function to set UDP checksum for an IPv6 UDP packet. This is intended | |
92 | * for the simple case like when setting the checksum for a UDP tunnel. | |
93 | */ | |
94 | void udp6_set_csum(bool nocheck, struct sk_buff *skb, | |
95 | const struct in6_addr *saddr, | |
96 | const struct in6_addr *daddr, int len) | |
97 | { | |
98 | struct udphdr *uh = udp_hdr(skb); | |
99 | ||
100 | if (nocheck) | |
101 | uh->check = 0; | |
102 | else if (skb_is_gso(skb)) | |
103 | uh->check = ~udp_v6_check(len, saddr, daddr, 0); | |
179bc67f EC |
104 | else if (skb->ip_summed == CHECKSUM_PARTIAL) { |
105 | uh->check = 0; | |
106 | uh->check = udp_v6_check(len, saddr, daddr, lco_csum(skb)); | |
107 | if (uh->check == 0) | |
108 | uh->check = CSUM_MANGLED_0; | |
d75f1306 | 109 | } else { |
af5fcba7 TH |
110 | skb->ip_summed = CHECKSUM_PARTIAL; |
111 | skb->csum_start = skb_transport_header(skb) - skb->head; | |
112 | skb->csum_offset = offsetof(struct udphdr, check); | |
113 | uh->check = ~udp_v6_check(len, saddr, daddr, 0); | |
af5fcba7 TH |
114 | } |
115 | } | |
116 | EXPORT_SYMBOL(udp6_set_csum); |