2  *  IP checksumming functions.
63     struct ip_header *ip;  in net_checksum_calculate()  local
99     /* Now check we have an IP header (with an optional VLAN header) */  in net_checksum_calculate()
104     ip = (struct ip_header *)((uint8_t *)data + mac_hdr_len);  in net_checksum_calculate()
106     if (IP_HEADER_VERSION(ip) != IP_HEADER_VERSION_4) {  in net_checksum_calculate()
110     /* Calculate IP checksum */  in net_checksum_calculate()
112         stw_he_p(&ip->ip_sum, 0);  in net_checksum_calculate()
113         csum = net_raw_checksum((uint8_t *)ip, IP_HDR_GET_LEN(ip));  in net_checksum_calculate()
114         stw_be_p(&ip->ip_sum, csum);  in net_checksum_calculate()
117     if (IP4_IS_FRAGMENT(ip)) {  in net_checksum_calculate()
118         return; /* a fragmented IP packet */  in net_checksum_calculate()
121     ip_len = lduw_be_p(&ip->ip_len);  in net_checksum_calculate()
123     /* Last, check that we have enough data for the all IP frame */  in net_checksum_calculate()
128     ip_len -= IP_HDR_GET_LEN(ip);  in net_checksum_calculate()
130     switch (ip->ip_p) {  in net_checksum_calculate()
137         tcp_header *tcp = (tcp_header *)(ip + 1);  in net_checksum_calculate()
146         csum = net_checksum_tcpudp(ip_len, ip->ip_p,  in net_checksum_calculate()
147                                    (uint8_t *)&ip->ip_src,  in net_checksum_calculate()
161         udp_header *udp = (udp_header *)(ip + 1);  in net_checksum_calculate()
170         csum = net_checksum_tcpudp(ip_len, ip->ip_p,  in net_checksum_calculate()
171                                    (uint8_t *)&ip->ip_src,  in net_checksum_calculate()