netif/ppp/demand.c

71     unsigned char data[1];
303 	memcpy(pkt->data, frame, len);
338 	if (PPP_PROTOCOL(pkt->data) == proto) {
342 		iphdr = (pkt->data[4] & 15) << 2;
343 		checksum = *((unsigned short *) (pkt->data+14));
349                 if (pkt->data[13] == 17) {
350                     pkt_checksum =  *((unsigned short *) (pkt->data+10+iphdr));
362 		if (pkt->data[13] == 6) {
363 		    pkt_checksum = *((unsigned short *) (pkt->data+20+iphdr));
371                 checksum -= *((unsigned short *) (pkt->data+16)) ^ 0xFFFF;
372                 checksum -= *((unsigned short *) (pkt->data+18)) ^ 0xFFFF;
374 		pkt_checksum -= *((unsigned short *) (pkt->data+16)) ^ 0xFFFF;
375 		pkt_checksum -= *((unsigned short *) (pkt->data+18)) ^ 0xFFFF;
378                 * ((u32_t *) (pkt->data + 16)) = newip;
381                 checksum += *((unsigned short *) (pkt->data+16)) ^ 0xFFFF;
382                 checksum += *((unsigned short *) (pkt->data+18)) ^ 0xFFFF;
384                 pkt_checksum += *((unsigned short *) (pkt->data+16)) ^ 0xFFFF;
385                 pkt_checksum += *((unsigned short *) (pkt->data+18)) ^ 0xFFFF;
391                 *((unsigned short *) (pkt->data+14)) = checksum;
392 		if (pkt->data[13] == 6) {
393 		    *((unsigned short *) (pkt->data+20+iphdr)) = pkt_checksum;
395 		if (cv && (pkt->data[13] == 17) ) {
396 		    *((unsigned short *) (pkt->data+10+iphdr)) = pkt_checksum;
400 		strcpy(ipstr,inet_ntoa(*( (struct in_addr *) (pkt->data+16))));
401 		if (pkt->data[13] == 1) {
404 			inet_ntoa(*( (struct in_addr *) (pkt->data+20))));
407 			pkt->data[13] == 6 ? "TCP" : "UDP",
409 			ntohs(*( (short *) (pkt->data+iphdr+4))),
410 			inet_ntoa(*( (struct in_addr *) (pkt->data+20))),
411 			ntohs(*( (short *) (pkt->data+iphdr+6))));
414 	    output(pcb, pkt->data, pkt->length);