cfe/net/net_ip.c

67 static int ip_rx_callback(ebuf_t *buf,void *ref);
83     ebuf_t *buf;
85     buf = eth_alloc(ipi->eth_info,ipi->ip_port);
87     if (buf == NULL) return buf;
89     ebuf_seek(buf,IPHDR_LENGTH);
90     ebuf_setlength(buf,0);
92     return buf;
144     *  _ip_send(ipi,buf,destaddr,proto)
151     *  	   buf - an ebuf
160 int _ip_send(ip_info_t *ipi,ebuf_t *buf,uint8_t *destaddr,uint8_t proto)
170     ebuf_seek(buf,-IPHDR_LENGTH);
172     pktlen = ebuf_length(buf) + IPHDR_LENGTH;
178     ebuf_put_u8(buf,IPHDR_VER_4 | IPHDR_LEN_20);
179     ebuf_put_u8(buf,IPHDR_TOS_DEFAULT);
180     ebuf_put_u16_be(buf,pktlen);
181     ebuf_put_u16_be(buf,ipi->ip_id);
182     ebuf_put_u16_be(buf,0);
183     ebuf_put_u8(buf,IPHDR_TTL_DEFAULT);
184     ebuf_put_u8(buf,proto);
185     ebuf_put_u16_be(buf,0);		/* checksum */
186     ebuf_put_bytes(buf,ipi->net_info.ip_addr,IP_ADDR_LEN);
187     ebuf_put_bytes(buf,destaddr,IP_ADDR_LEN);
191     ebuf_prepend(buf,IPHDR_LENGTH);
195     ptr = ebuf_ptr(buf);
207 	eth_send(buf,(uint8_t *) enet_broadcast);
208 	eth_free(buf);
218 	return _arp_lookup_and_send(ipi,buf,destaddr);
235 	return _arp_lookup_and_send(ipi,buf,destaddr);
240 	    eth_free(buf);	/* silently drop */
244 	    return _arp_lookup_and_send(ipi,buf,ipi->net_info.ip_gateway);
252     *  ip_rx_callback(buf,ref)
259     *  	   buf - ebuf we received
267 static int ip_rx_callback(ebuf_t *buf,void *ref)
284     hdr = ebuf_ptr(buf);		/* save current posn */
286     ebuf_get_u8(buf,tmp);		/* version and header length */
319     ebuf_skip(buf,1);			/* skip TOS field */
321     ebuf_get_u16_be(buf,length);
322     ebuf_skip(buf,2);			/* skip ID field */
324     ebuf_get_u16_be(buf,tmp16);		/* get Fragment Offset field */
336     ebuf_skip(buf,1);			/* skip TTL */
337     ebuf_get_u8(buf,proto);		/* get protocol */
338     ebuf_skip(buf,2);			/* skip checksum */
340     ebuf_get_bytes(buf,srcip,IP_ADDR_LEN);
341     ebuf_get_bytes(buf,dstip,IP_ADDR_LEN);
343     ebuf_skip(buf,hdrlen-IPHDR_LENGTH); /* skip rest of header */
345     ebuf_setlength(buf,length-hdrlen);	/* set length to just data portion */
372 	    res = (*(pdisp->cb))(pdisp->ref,buf,dstip,srcip);
508     *  _ip_free(ipi,buf)
514     *  	   buf - ebuf to free
520 void _ip_free(ip_info_t *ipi,ebuf_t *buf)
522     eth_free(buf);
526     *  _ip_getaddr(ipi,buf)
532     *  	   buf - pointer to 4-byte buffer to receive IP address
538 void _ip_getaddr(ip_info_t *ipi,uint8_t *buf)
540     memcpy(buf,ipi->net_info.ip_addr,IP_ADDR_LEN);
682 		  int (*cb)(void *ref,ebuf_t *buf,uint8_t *dst,uint8_t *src),void *ref)