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