Cross Reference: /systemd/src/libsystemd-network/dhcp-packet.c

Lines Matching refs:packet
91 void dhcp_packet_append_ip_headers(DHCPPacket *packet, be32_t source_addr,
94         packet->ip.version = IPVERSION;
95         packet->ip.ihl = DHCP_IP_SIZE / 4;
96         packet->ip.tot_len = htobe16(len);
98         packet->ip.tos = IPTOS_CLASS_CS6;
100         packet->ip.protocol = IPPROTO_UDP;
101         packet->ip.saddr = source_addr;
102         packet->ip.daddr = destination_addr;
104         packet->udp.source = htobe16(source_port);
105         packet->udp.dest = htobe16(destination_port);
107         packet->udp.len = htobe16(len - DHCP_IP_SIZE);
109         packet->ip.check = packet->udp.len;
110         packet->udp.check = dhcp_packet_checksum((uint8_t*)&packet->ip.ttl, len - 8);
112         packet->ip.ttl = IPDEFTTL;
113         packet->ip.check = 0;
114         packet->ip.check = dhcp_packet_checksum((uint8_t*)&packet->ip, DHCP_IP_SIZE);
117 int dhcp_packet_verify_headers(DHCPPacket *packet, size_t len, bool checksum) {
120         assert(packet);
124         if (packet->ip.version != IPVERSION) {
125                 log_debug("ignoring packet: not IPv4");
129         if (packet->ip.ihl < 5) {
130                 log_debug("ignoring packet: IPv4 IHL (%u words) invalid",
131                           packet->ip.ihl);
135         hdrlen = packet->ip.ihl * 4;
137                 log_debug("ignoring packet: IPv4 IHL (%zu bytes) "
143                 log_debug("ignoring packet: packet (%zu bytes) "
151         if (packet->ip.protocol != IPPROTO_UDP) {
152                 log_debug("ignoring packet: not UDP");
156         if (len < hdrlen + be16toh(packet->udp.len)) {
157                 log_debug("ignoring packet: packet (%zu bytes) "
159                           hdrlen + be16toh(packet->udp.len));
163         if (be16toh(packet->udp.dest) != DHCP_PORT_CLIENT) {
164                 log_debug("ignoring packet: to port %u, which "
166                           be16toh(packet->udp.dest), DHCP_PORT_CLIENT);
174         if (dhcp_packet_checksum((uint8_t*)&packet->ip, hdrlen)) {
175                 log_debug("ignoring packet: invalid IP checksum");
179         if (checksum && packet->udp.check) {
180                 packet->ip.check = packet->udp.len;
181                 packet->ip.ttl = 0;
183                 if (dhcp_packet_checksum((uint8_t*)&packet->ip.ttl,
184                                   be16toh(packet->udp.len) + 12)) {
185                         log_debug("ignoring packet: invalid UDP checksum");