1 // SPDX-License-Identifier: GPL-2.0
5 #include <asm/checksum.h>
18 	sum += (__force u32)saddr->s6_addr32[0];  in csum_ipv6_magic()
19 	carry = (sum < (__force u32)saddr->s6_addr32[0]);  in csum_ipv6_magic()
22 	sum += (__force u32)saddr->s6_addr32[1];  in csum_ipv6_magic()
23 	carry = (sum < (__force u32)saddr->s6_addr32[1]);  in csum_ipv6_magic()
26 	sum += (__force u32)saddr->s6_addr32[2];  in csum_ipv6_magic()
27 	carry = (sum < (__force u32)saddr->s6_addr32[2]);  in csum_ipv6_magic()
30 	sum += (__force u32)saddr->s6_addr32[3];  in csum_ipv6_magic()
31 	carry = (sum < (__force u32)saddr->s6_addr32[3]);  in csum_ipv6_magic()
34 	sum += (__force u32)daddr->s6_addr32[0];  in csum_ipv6_magic()
35 	carry = (sum < (__force u32)daddr->s6_addr32[0]);  in csum_ipv6_magic()
38 	sum += (__force u32)daddr->s6_addr32[1];  in csum_ipv6_magic()
39 	carry = (sum < (__force u32)daddr->s6_addr32[1]);  in csum_ipv6_magic()
42 	sum += (__force u32)daddr->s6_addr32[2];  in csum_ipv6_magic()
43 	carry = (sum < (__force u32)daddr->s6_addr32[2]);  in csum_ipv6_magic()
46 	sum += (__force u32)daddr->s6_addr32[3];  in csum_ipv6_magic()
47 	carry = (sum < (__force u32)daddr->s6_addr32[3]);  in csum_ipv6_magic()
69 	UDP_SKB_CB(skb)->partial_cov = 0;  in udp6_csum_init()
70 	UDP_SKB_CB(skb)->cscov = skb->len;  in udp6_csum_init()
77 		if (UDP_SKB_CB(skb)->partial_cov) {  in udp6_csum_init()
78 			skb->csum = ip6_compute_pseudo(skb, proto);  in udp6_csum_init()
83 	/* To support RFC 6936 (allow zero checksum in UDP/IPV6 for tunnels)  in udp6_csum_init()
84 	 * we accept a checksum of zero here. When we find the socket  in udp6_csum_init()
85 	 * for the UDP packet we'll check if that socket allows zero checksum  in udp6_csum_init()
91 	err = (__force int)skb_checksum_init_zero_check(skb, proto, uh->check,  in udp6_csum_init()
96 	if (skb->ip_summed == CHECKSUM_COMPLETE && !skb->csum_valid) {  in udp6_csum_init()
98 		if (skb->csum_complete_sw)  in udp6_csum_init()
101 		/* HW says the value is bad. Let's validate that.  in udp6_csum_init()
102 		 * skb->csum is no longer the full packet checksum,  in udp6_csum_init()
112 /* Function to set UDP checksum for an IPv6 UDP packet. This is intended
113  * for the simple case like when setting the checksum for a UDP tunnel.
122 		uh->check = 0;  in udp6_set_csum()
124 		uh->check = ~udp_v6_check(len, saddr, daddr, 0);  in udp6_set_csum()
125 	else if (skb->ip_summed == CHECKSUM_PARTIAL) {  in udp6_set_csum()
126 		uh->check = 0;  in udp6_set_csum()
127 		uh->check = udp_v6_check(len, saddr, daddr, lco_csum(skb));  in udp6_set_csum()
128 		if (uh->check == 0)  in udp6_set_csum()
129 			uh->check = CSUM_MANGLED_0;  in udp6_set_csum()
131 		skb->ip_summed = CHECKSUM_PARTIAL;  in udp6_set_csum()
132 		skb->csum_start = skb_transport_header(skb) - skb->head;  in udp6_set_csum()
133 		skb->csum_offset = offsetof(struct udphdr, check);  in udp6_set_csum()
134 		uh->check = ~udp_v6_check(len, saddr, daddr, 0);  in udp6_set_csum()