1 // SPDX-License-Identifier: GPL-2.0 1 // SPDX-License-Identifier: GPL-2.0
2 #include <net/ip.h> 2 #include <net/ip.h>
3 #include <net/udp.h> 3 #include <net/udp.h>
4 #include <net/udplite.h> 4 #include <net/udplite.h>
5 #include <asm/checksum.h> 5 #include <asm/checksum.h>
6 6
7 #ifndef _HAVE_ARCH_IPV6_CSUM 7 #ifndef _HAVE_ARCH_IPV6_CSUM
8 __sum16 csum_ipv6_magic(const struct in6_addr 8 __sum16 csum_ipv6_magic(const struct in6_addr *saddr,
9 const struct in6_addr 9 const struct in6_addr *daddr,
10 __u32 len, __u8 proto, 10 __u32 len, __u8 proto, __wsum csum)
11 { 11 {
12 12
13 int carry; 13 int carry;
14 __u32 ulen; 14 __u32 ulen;
15 __u32 uproto; 15 __u32 uproto;
16 __u32 sum = (__force u32)csum; 16 __u32 sum = (__force u32)csum;
17 17
18 sum += (__force u32)saddr->s6_addr32[0 18 sum += (__force u32)saddr->s6_addr32[0];
19 carry = (sum < (__force u32)saddr->s6_ 19 carry = (sum < (__force u32)saddr->s6_addr32[0]);
20 sum += carry; 20 sum += carry;
21 21
22 sum += (__force u32)saddr->s6_addr32[1 22 sum += (__force u32)saddr->s6_addr32[1];
23 carry = (sum < (__force u32)saddr->s6_ 23 carry = (sum < (__force u32)saddr->s6_addr32[1]);
24 sum += carry; 24 sum += carry;
25 25
26 sum += (__force u32)saddr->s6_addr32[2 26 sum += (__force u32)saddr->s6_addr32[2];
27 carry = (sum < (__force u32)saddr->s6_ 27 carry = (sum < (__force u32)saddr->s6_addr32[2]);
28 sum += carry; 28 sum += carry;
29 29
30 sum += (__force u32)saddr->s6_addr32[3 30 sum += (__force u32)saddr->s6_addr32[3];
31 carry = (sum < (__force u32)saddr->s6_ 31 carry = (sum < (__force u32)saddr->s6_addr32[3]);
32 sum += carry; 32 sum += carry;
33 33
34 sum += (__force u32)daddr->s6_addr32[0 34 sum += (__force u32)daddr->s6_addr32[0];
35 carry = (sum < (__force u32)daddr->s6_ 35 carry = (sum < (__force u32)daddr->s6_addr32[0]);
36 sum += carry; 36 sum += carry;
37 37
38 sum += (__force u32)daddr->s6_addr32[1 38 sum += (__force u32)daddr->s6_addr32[1];
39 carry = (sum < (__force u32)daddr->s6_ 39 carry = (sum < (__force u32)daddr->s6_addr32[1]);
40 sum += carry; 40 sum += carry;
41 41
42 sum += (__force u32)daddr->s6_addr32[2 42 sum += (__force u32)daddr->s6_addr32[2];
43 carry = (sum < (__force u32)daddr->s6_ 43 carry = (sum < (__force u32)daddr->s6_addr32[2]);
44 sum += carry; 44 sum += carry;
45 45
46 sum += (__force u32)daddr->s6_addr32[3 46 sum += (__force u32)daddr->s6_addr32[3];
47 carry = (sum < (__force u32)daddr->s6_ 47 carry = (sum < (__force u32)daddr->s6_addr32[3]);
48 sum += carry; 48 sum += carry;
49 49
50 ulen = (__force u32)htonl((__u32) len) 50 ulen = (__force u32)htonl((__u32) len);
51 sum += ulen; 51 sum += ulen;
52 carry = (sum < ulen); 52 carry = (sum < ulen);
53 sum += carry; 53 sum += carry;
54 54
55 uproto = (__force u32)htonl(proto); 55 uproto = (__force u32)htonl(proto);
56 sum += uproto; 56 sum += uproto;
57 carry = (sum < uproto); 57 carry = (sum < uproto);
58 sum += carry; 58 sum += carry;
59 59
60 return csum_fold((__force __wsum)sum); 60 return csum_fold((__force __wsum)sum);
61 } 61 }
62 EXPORT_SYMBOL(csum_ipv6_magic); 62 EXPORT_SYMBOL(csum_ipv6_magic);
63 #endif 63 #endif
64 64
65 int udp6_csum_init(struct sk_buff *skb, struct 65 int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh, int proto)
66 { 66 {
67 int err; 67 int err;
68 68
69 UDP_SKB_CB(skb)->partial_cov = 0; 69 UDP_SKB_CB(skb)->partial_cov = 0;
70 UDP_SKB_CB(skb)->cscov = skb->len; 70 UDP_SKB_CB(skb)->cscov = skb->len;
71 71
72 if (proto == IPPROTO_UDPLITE) { 72 if (proto == IPPROTO_UDPLITE) {
73 err = udplite_checksum_init(sk 73 err = udplite_checksum_init(skb, uh);
74 if (err) 74 if (err)
75 return err; 75 return err;
76 76
77 if (UDP_SKB_CB(skb)->partial_c 77 if (UDP_SKB_CB(skb)->partial_cov) {
78 skb->csum = ip6_comput 78 skb->csum = ip6_compute_pseudo(skb, proto);
79 return 0; 79 return 0;
80 } 80 }
81 } 81 }
82 82
83 /* To support RFC 6936 (allow zero che 83 /* To support RFC 6936 (allow zero checksum in UDP/IPV6 for tunnels)
84 * we accept a checksum of zero here. 84 * we accept a checksum of zero here. When we find the socket
85 * for the UDP packet we'll check if t 85 * for the UDP packet we'll check if that socket allows zero checksum
86 * for IPv6 (set by socket option). 86 * for IPv6 (set by socket option).
87 * 87 *
88 * Note, we are only interested in != 88 * Note, we are only interested in != 0 or == 0, thus the
89 * force to int. 89 * force to int.
90 */ 90 */
91 err = (__force int)skb_checksum_init_z 91 err = (__force int)skb_checksum_init_zero_check(skb, proto, uh->check,
92 92 ip6_compute_pseudo);
93 if (err) 93 if (err)
94 return err; 94 return err;
95 95
96 if (skb->ip_summed == CHECKSUM_COMPLET 96 if (skb->ip_summed == CHECKSUM_COMPLETE && !skb->csum_valid) {
97 /* If SW calculated the value, 97 /* If SW calculated the value, we know it's bad */
98 if (skb->csum_complete_sw) 98 if (skb->csum_complete_sw)
99 return 1; 99 return 1;
100 100
101 /* HW says the value is bad. L 101 /* HW says the value is bad. Let's validate that.
102 * skb->csum is no longer the 102 * skb->csum is no longer the full packet checksum,
103 * so don't treat is as such. 103 * so don't treat is as such.
104 */ 104 */
105 skb_checksum_complete_unset(sk 105 skb_checksum_complete_unset(skb);
106 } 106 }
107 107
108 return 0; 108 return 0;
109 } 109 }
110 EXPORT_SYMBOL(udp6_csum_init); 110 EXPORT_SYMBOL(udp6_csum_init);
111 111
112 /* Function to set UDP checksum for an IPv6 UD 112 /* Function to set UDP checksum for an IPv6 UDP packet. This is intended
113 * for the simple case like when setting the c 113 * for the simple case like when setting the checksum for a UDP tunnel.
114 */ 114 */
115 void udp6_set_csum(bool nocheck, struct sk_buf 115 void udp6_set_csum(bool nocheck, struct sk_buff *skb,
116 const struct in6_addr *sadd 116 const struct in6_addr *saddr,
117 const struct in6_addr *dadd 117 const struct in6_addr *daddr, int len)
118 { 118 {
119 struct udphdr *uh = udp_hdr(skb); 119 struct udphdr *uh = udp_hdr(skb);
120 120
121 if (nocheck) 121 if (nocheck)
122 uh->check = 0; 122 uh->check = 0;
123 else if (skb_is_gso(skb)) 123 else if (skb_is_gso(skb))
124 uh->check = ~udp_v6_check(len, 124 uh->check = ~udp_v6_check(len, saddr, daddr, 0);
125 else if (skb->ip_summed == CHECKSUM_PA 125 else if (skb->ip_summed == CHECKSUM_PARTIAL) {
126 uh->check = 0; 126 uh->check = 0;
127 uh->check = udp_v6_check(len, 127 uh->check = udp_v6_check(len, saddr, daddr, lco_csum(skb));
128 if (uh->check == 0) 128 if (uh->check == 0)
129 uh->check = CSUM_MANGL 129 uh->check = CSUM_MANGLED_0;
130 } else { 130 } else {
131 skb->ip_summed = CHECKSUM_PART 131 skb->ip_summed = CHECKSUM_PARTIAL;
132 skb->csum_start = skb_transpor 132 skb->csum_start = skb_transport_header(skb) - skb->head;
133 skb->csum_offset = offsetof(st 133 skb->csum_offset = offsetof(struct udphdr, check);
134 uh->check = ~udp_v6_check(len, 134 uh->check = ~udp_v6_check(len, saddr, daddr, 0);
135 } 135 }
136 } 136 }
137 EXPORT_SYMBOL(udp6_set_csum); 137 EXPORT_SYMBOL(udp6_set_csum);
138 138
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