58 static __always_inline __u16 csum_fold_helper(__u32 csum)  in csum_fold_helper()  argument
60 	return ~((csum & 0xffff) + (csum >> 16));  in csum_fold_helper()
64 				      __u32 *csum)  in ipv4_csum()  argument
66 	*csum = bpf_csum_diff(0, 0, data_start, data_size, *csum);  in ipv4_csum()
67 	*csum = csum_fold_helper(*csum);  in ipv4_csum()
85 	__u32 csum = 0;  in send_icmp4_too_big()  local
100 	ipv4_csum(icmp_hdr, ICMP_TOOBIG_PAYLOAD_SIZE, &csum);  in send_icmp4_too_big()
101 	icmp_hdr->checksum = csum;  in send_icmp4_too_big()
112 	csum = 0;  in send_icmp4_too_big()
113 	ipv4_csum(iph, sizeof(struct iphdr), &csum);  in send_icmp4_too_big()
114 	iph->check = csum;  in send_icmp4_too_big()