156     } packet;  in receive_packet()  local
162     nread = read(s, &packet, sizeof(packet));  in receive_packet()
167      * The raw packet interface gives us all packets received by the  in receive_packet()
174         ALOGD("Packet is too small (%d) to be a UDP datagram", nread);  in receive_packet()
176     } else if (packet.ip.version != IPVERSION || packet.ip.ihl != (sizeof(packet.ip) >> 2)) {  in receive_packet()
178         ALOGD("Not a valid IP packet");  in receive_packet()
180     } else if (nread < ntohs(packet.ip.tot_len)) {  in receive_packet()
182         ALOGD("Packet was truncated (read %d, needed %d)", nread, ntohs(packet.ip.tot_len));  in receive_packet()
184     } else if (packet.ip.protocol != IPPROTO_UDP) {  in receive_packet()
186         ALOGD("IP protocol (%d) is not UDP", packet.ip.protocol);  in receive_packet()
188     } else if (packet.udp.dest != htons(PORT_BOOTP_CLIENT)) {  in receive_packet()
190         ALOGD("UDP dest port (%d) is not DHCP client", ntohs(packet.udp.dest));  in receive_packet()
200     /* Seems like it's probably a valid DHCP packet */  in receive_packet()
202     sum = finish_sum(checksum(&packet.ip, sizeof(packet.ip), 0));  in receive_packet()
204         printf("IP header checksum failure (0x%x)\n", packet.ip.check);  in receive_packet()
212     dhcp_size = ntohs(packet.udp.len) - sizeof(packet.udp);  in receive_packet()
223         printf("Malformed Packet\n");  in receive_packet()
227     saddr = packet.ip.saddr;  in receive_packet()
228     daddr = packet.ip.daddr;  in receive_packet()
229     nread = ntohs(packet.ip.tot_len);  in receive_packet()
230     memset(&packet.ip, 0, sizeof(packet.ip));  in receive_packet()
231     packet.ip.saddr = saddr;  in receive_packet()
232     packet.ip.daddr = daddr;  in receive_packet()
233     packet.ip.protocol = IPPROTO_UDP;  in receive_packet()
234     packet.ip.tot_len = packet.udp.len;  in receive_packet()
235     temp = packet.udp.check;  in receive_packet()
236     packet.udp.check = 0;  in receive_packet()
237     sum = finish_sum(checksum(&packet, nread, 0));  in receive_packet()
238     packet.udp.check = temp;  in receive_packet()
245     memcpy(msg, &packet.dhcp, dhcp_size);  in receive_packet()