Beispiel #1
0
/*
 * Copy parameters of interest from BOOTP_REPLY/DHCP_OFFER packet
 */
static void store_net_params(struct bootp_hdr *bp)
{
#if !defined(CONFIG_BOOTP_SERVERIP)
	struct in_addr tmp_ip;

	net_copy_ip(&tmp_ip, &bp->bp_siaddr);
	if (tmp_ip.s_addr != 0)
		net_copy_ip(&net_server_ip, &bp->bp_siaddr);
	memcpy(net_server_ethaddr,
	       ((struct ethernet_hdr *)net_rx_packet)->et_src, 6);
	if (strlen(bp->bp_file) > 0)
		copy_filename(net_boot_file_name, bp->bp_file,
			      sizeof(net_boot_file_name));

	debug("net_boot_file_name: %s\n", net_boot_file_name);

	/* Propagate to environment:
	 * don't delete exising entry when BOOTP / DHCP reply does
	 * not contain a new value
	 */
	if (*net_boot_file_name)
		setenv("bootfile", net_boot_file_name);
#endif
	net_copy_ip(&net_ip, &bp->bp_yiaddr);
}
Beispiel #2
0
void ping_receive(struct ethernet_hdr *et, struct ip_udp_hdr *ip, int len)
{
	struct icmp_hdr *icmph = (struct icmp_hdr *)&ip->udp_src;
	struct in_addr src_ip;
	int eth_hdr_size;

	switch (icmph->type) {
	case ICMP_ECHO_REPLY:
		src_ip = net_read_ip((void *)&ip->ip_src);
		if (src_ip.s_addr == net_ping_ip.s_addr)
			net_set_state(NETLOOP_SUCCESS);
		return;
	case ICMP_ECHO_REQUEST:
		eth_hdr_size = net_update_ether(et, et->et_src, PROT_IP);

		debug_cond(DEBUG_DEV_PKT,
			   "Got ICMP ECHO REQUEST, return %d bytes\n",
			   eth_hdr_size + len);

		ip->ip_sum = 0;
		ip->ip_off = 0;
		net_copy_ip((void *)&ip->ip_dst, &ip->ip_src);
		net_copy_ip((void *)&ip->ip_src, &net_ip);
		ip->ip_sum = compute_ip_checksum(ip, IP_HDR_SIZE);

		icmph->type = ICMP_ECHO_REPLY;
		icmph->checksum = 0;
		icmph->checksum = compute_ip_checksum(icmph, len - IP_HDR_SIZE);
		net_send_packet((uchar *)et, eth_hdr_size + len);
		return;
/*	default:
		return;*/
	}
}
Beispiel #3
0
static void dhcp_send_request_packet(struct bootp *bp_offer)
{
	struct bootp *bp;
	int extlen;
	IPaddr_t OfferedIP;
	unsigned char *payload = net_udp_get_payload(dhcp_con);

	debug("%s: Sending DHCPREQUEST\n", __func__);

	bp = (struct bootp *)payload;
	bp->bp_op = OP_BOOTREQUEST;
	bp->bp_htype = HWT_ETHER;
	bp->bp_hlen = HWL_ETHER;
	bp->bp_hops = 0;
	/* FIXME what is this? */
//	bp->bp_secs = htons(get_timer(0) / CFG_HZ);
	net_copy_ip(&bp->bp_ciaddr, &bp_offer->bp_ciaddr); /* both in network byte order */
	net_copy_ip(&bp->bp_yiaddr, &bp_offer->bp_yiaddr);
	net_copy_ip(&bp->bp_siaddr, &bp_offer->bp_siaddr);
	/*
	 * RFC3046 requires Relay Agents to discard packets with
	 * nonzero and offered giaddr
	 */
	net_write_ip(&bp->bp_giaddr, 0);

	memcpy(bp->bp_chaddr, dhcp_con->et->et_src, 6);

	/*
	 * ID is the id of the OFFER packet
	 */

	net_copy_uint32(&bp->bp_id, &bp_offer->bp_id);

	/*
	 * Copy options from OFFER packet if present
	 */
	net_copy_ip(&OfferedIP, &bp->bp_yiaddr);
	extlen = dhcp_extended((u8 *)bp->bp_vend, DHCP_REQUEST, net_dhcp_server_ip,
				OfferedIP);

	debug("Transmitting DHCPREQUEST packet\n");
	net_udp_send(dhcp_con, sizeof(*bp) + extlen);
}
Beispiel #4
0
static void copy_ip_handle(struct dhcp_opt *opt, unsigned char *popt, int optlen)
{
	net_copy_ip(opt->data, popt);
};
Beispiel #5
0
static int sb_eth_send(struct udevice *dev, void *packet, int length)
{
	struct eth_sandbox_priv *priv = dev_get_priv(dev);
	struct ethernet_hdr *eth = packet;

	debug("eth_sandbox: Send packet %d\n", length);

	if (dev->seq >= 0 && dev->seq < ARRAY_SIZE(disabled) &&
	    disabled[dev->seq])
		return 0;

	if (ntohs(eth->et_protlen) == PROT_ARP) {
		struct arp_hdr *arp = packet + ETHER_HDR_SIZE;

		if (ntohs(arp->ar_op) == ARPOP_REQUEST) {
			struct ethernet_hdr *eth_recv;
			struct arp_hdr *arp_recv;

			/* store this as the assumed IP of the fake host */
			priv->fake_host_ipaddr = net_read_ip(&arp->ar_tpa);
			/* Formulate a fake response */
			eth_recv = (void *)priv->recv_packet_buffer;
			memcpy(eth_recv->et_dest, eth->et_src, ARP_HLEN);
			memcpy(eth_recv->et_src, priv->fake_host_hwaddr,
			       ARP_HLEN);
			eth_recv->et_protlen = htons(PROT_ARP);

			arp_recv = (void *)priv->recv_packet_buffer +
				ETHER_HDR_SIZE;
			arp_recv->ar_hrd = htons(ARP_ETHER);
			arp_recv->ar_pro = htons(PROT_IP);
			arp_recv->ar_hln = ARP_HLEN;
			arp_recv->ar_pln = ARP_PLEN;
			arp_recv->ar_op = htons(ARPOP_REPLY);
			memcpy(&arp_recv->ar_sha, priv->fake_host_hwaddr,
			       ARP_HLEN);
			net_write_ip(&arp_recv->ar_spa, priv->fake_host_ipaddr);
			memcpy(&arp_recv->ar_tha, &arp->ar_sha, ARP_HLEN);
			net_copy_ip(&arp_recv->ar_tpa, &arp->ar_spa);

			priv->recv_packet_length = ETHER_HDR_SIZE +
				ARP_HDR_SIZE;
		}
	} else if (ntohs(eth->et_protlen) == PROT_IP) {
		struct ip_udp_hdr *ip = packet + ETHER_HDR_SIZE;

		if (ip->ip_p == IPPROTO_ICMP) {
			struct icmp_hdr *icmp = (struct icmp_hdr *)&ip->udp_src;

			if (icmp->type == ICMP_ECHO_REQUEST) {
				struct ethernet_hdr *eth_recv;
				struct ip_udp_hdr *ipr;
				struct icmp_hdr *icmpr;

				/* reply to the ping */
				memcpy(priv->recv_packet_buffer, packet,
				       length);
				eth_recv = (void *)priv->recv_packet_buffer;
				ipr = (void *)priv->recv_packet_buffer +
					ETHER_HDR_SIZE;
				icmpr = (struct icmp_hdr *)&ipr->udp_src;
				memcpy(eth_recv->et_dest, eth->et_src,
				       ARP_HLEN);
				memcpy(eth_recv->et_src, priv->fake_host_hwaddr,
				       ARP_HLEN);
				ipr->ip_sum = 0;
				ipr->ip_off = 0;
				net_copy_ip((void *)&ipr->ip_dst, &ip->ip_src);
				net_write_ip((void *)&ipr->ip_src,
					     priv->fake_host_ipaddr);
				ipr->ip_sum = compute_ip_checksum(ipr,
					IP_HDR_SIZE);

				icmpr->type = ICMP_ECHO_REPLY;
				icmpr->checksum = 0;
				icmpr->checksum = compute_ip_checksum(icmpr,
					ICMP_HDR_SIZE);

				priv->recv_packet_length = length;
			}
		}
	}

	return 0;
}
Beispiel #6
0
static void dhcp_options_process(unsigned char *popt, struct bootp *bp)
{
	unsigned char *end = popt + sizeof(*bp) + OPT_SIZE;
	int oplen;
	IPaddr_t ip;
	char str[256];

	while (popt < end && *popt != 0xff) {
		oplen = *(popt + 1);
		switch (*popt) {
		case 1:
			ip = net_read_ip(popt + 2);
			net_set_netmask(ip);
			break;
		case 3:
			ip = net_read_ip(popt + 2);
			net_set_gateway(ip);
			break;
		case 6:
			ip = net_read_ip(popt + 2);
			setenv_ip("nameserver", ip);
			break;
		case 12:
			memcpy(str, popt + 2, oplen);
			str[oplen] = 0;
			setenv("hostname", str);
			break;
		case 15:
			memcpy(str, popt + 2, oplen);
			str[oplen] = 0;
			setenv("domainname", str);
			break;
		case 17:
			memcpy(str, popt + 2, oplen);
			str[oplen] = 0;
			setenv("rootpath", str);
			break;
		case 51:
			net_copy_uint32 (&dhcp_leasetime, (uint32_t *)(popt + 2));
			break;
		case 53:	/* Ignore Message Type Option */
			break;
		case 54:
			net_copy_ip(&net_dhcp_server_ip, (popt + 2));
			break;
		case 58:	/* Ignore Renewal Time Option */
			break;
		case 59:	/* Ignore Rebinding Time Option */
			break;
		case 66:	/* Ignore TFTP server name */
			break;
		case 67:	/* vendor opt bootfile */
			/*
			 * I can't use dhcp_vendorex_proc here because I need
			 * to write into the bootp packet - even then I had to
			 * pass the bootp packet pointer into here as the
			 * second arg
			 */
			memcpy(str, popt + 2, oplen);
			str[oplen] = 0;
			if (bp->bp_file[0] == '\0') {
				/*
				 * only use vendor boot file if we didn't
				 * receive a boot file in the main non-vendor
				 * part of the packet - god only knows why
				 * some vendors chose not to use this perfectly
				 * good spot to store the boot file (join on
				 * Tru64 Unix) it seems mind bogglingly crazy
				 * to me
				 */
				printf("*** WARNING: using vendor "
					"optional boot file\n");
					setenv("bootfile", str);
			}
			break;
		default:
#ifdef CONFIG_BOOTP_VENDOREX
			if (dhcp_vendorex_proc (popt))
				break;
#endif
			debug("*** Unhandled DHCP Option in OFFER/ACK: %d\n", *popt);
			break;
		}
		popt += oplen + 2;	/* Process next option */
	}
}
Beispiel #7
0
static void bootp_process_vendor_field(u8 *ext)
{
	int size = *(ext + 1);

	debug("[BOOTP] Processing extension %d... (%d bytes)\n", *ext,
	      *(ext + 1));

	net_boot_file_expected_size_in_blocks = 0;

	switch (*ext) {
		/* Fixed length fields */
	case 1:			/* Subnet mask */
		if (net_netmask.s_addr == 0)
			net_copy_ip(&net_netmask, (struct in_addr *)(ext + 2));
		break;
	case 2:			/* Time offset - Not yet supported */
		break;
		/* Variable length fields */
	case 3:			/* Gateways list */
		if (net_gateway.s_addr == 0)
			net_copy_ip(&net_gateway, (struct in_addr *)(ext + 2));
		break;
	case 4:			/* Time server - Not yet supported */
		break;
	case 5:			/* IEN-116 name server - Not yet supported */
		break;
	case 6:
		if (net_dns_server.s_addr == 0)
			net_copy_ip(&net_dns_server,
				    (struct in_addr *)(ext + 2));
#if defined(CONFIG_BOOTP_DNS2)
		if ((net_dns_server2.s_addr == 0) && (size > 4))
			net_copy_ip(&net_dns_server2,
				    (struct in_addr *)(ext + 2 + 4));
#endif
		break;
	case 7:			/* Log server - Not yet supported */
		break;
	case 8:			/* Cookie/Quote server - Not yet supported */
		break;
	case 9:			/* LPR server - Not yet supported */
		break;
	case 10:		/* Impress server - Not yet supported */
		break;
	case 11:		/* RPL server - Not yet supported */
		break;
	case 12:		/* Host name */
		if (net_hostname[0] == 0) {
			size = truncate_sz("Host Name",
				sizeof(net_hostname), size);
			memcpy(&net_hostname, ext + 2, size);
			net_hostname[size] = 0;
		}
		break;
	case 13:		/* Boot file size */
		if (size == 2)
			net_boot_file_expected_size_in_blocks =
				ntohs(*(ushort *)(ext + 2));
		else if (size == 4)
			net_boot_file_expected_size_in_blocks =
				ntohl(*(ulong *)(ext + 2));
		break;
	case 14:		/* Merit dump file - Not yet supported */
		break;
	case 15:		/* Domain name - Not yet supported */
		break;
	case 16:		/* Swap server - Not yet supported */
		break;
	case 17:		/* Root path */
		if (net_root_path[0] == 0) {
			size = truncate_sz("Root Path",
				sizeof(net_root_path), size);
			memcpy(&net_root_path, ext + 2, size);
			net_root_path[size] = 0;
		}
		break;
	case 18:		/* Extension path - Not yet supported */
		/*
		 * This can be used to send the information of the
		 * vendor area in another file that the client can
		 * access via TFTP.
		 */
		break;
		/* IP host layer fields */
	case 40:		/* NIS Domain name */
		if (net_nis_domain[0] == 0) {
			size = truncate_sz("NIS Domain Name",
				sizeof(net_nis_domain), size);
			memcpy(&net_nis_domain, ext + 2, size);
			net_nis_domain[size] = 0;
		}
		break;
#if defined(CONFIG_CMD_SNTP) && defined(CONFIG_BOOTP_NTPSERVER)
	case 42:	/* NTP server IP */
		net_copy_ip(&net_ntp_server, (struct in_addr *)(ext + 2));
		break;
#endif
		/* Application layer fields */
	case 43:		/* Vendor specific info - Not yet supported */
		/*
		 * Binary information to exchange specific
		 * product information.
		 */
		break;
		/* Reserved (custom) fields (128..254) */
	}
}
Beispiel #8
0
void arp_receive(struct ethernet_hdr *et, struct ip_udp_hdr *ip, int len)
{
	struct arp_hdr *arp;
	struct in_addr reply_ip_addr;
	uchar *pkt;
	int eth_hdr_size;

	/*
	 * We have to deal with two types of ARP packets:
	 * - REQUEST packets will be answered by sending  our
	 *   IP address - if we know it.
	 * - REPLY packates are expected only after we asked
	 *   for the TFTP server's or the gateway's ethernet
	 *   address; so if we receive such a packet, we set
	 *   the server ethernet address
	 */
	debug_cond(DEBUG_NET_PKT, "Got ARP\n");

	arp = (struct arp_hdr *)ip;
	if (len < ARP_HDR_SIZE) {
		printf("bad length %d < %d\n", len, ARP_HDR_SIZE);
		return;
	}
	if (ntohs(arp->ar_hrd) != ARP_ETHER)
		return;
	if (ntohs(arp->ar_pro) != PROT_IP)
		return;
	if (arp->ar_hln != ARP_HLEN)
		return;
	if (arp->ar_pln != ARP_PLEN)
		return;

	if (net_ip.s_addr == 0)
		return;

	if (net_read_ip(&arp->ar_tpa).s_addr != net_ip.s_addr)
		return;

	switch (ntohs(arp->ar_op)) {
	case ARPOP_REQUEST:
		/* reply with our IP address */
		debug_cond(DEBUG_DEV_PKT, "Got ARP REQUEST, return our IP\n");
		pkt = (uchar *)et;
		eth_hdr_size = net_update_ether(et, et->et_src, PROT_ARP);
		pkt += eth_hdr_size;
		arp->ar_op = htons(ARPOP_REPLY);
		memcpy(&arp->ar_tha, &arp->ar_sha, ARP_HLEN);
		net_copy_ip(&arp->ar_tpa, &arp->ar_spa);
		memcpy(&arp->ar_sha, net_ethaddr, ARP_HLEN);
		net_copy_ip(&arp->ar_spa, &net_ip);

#ifdef CONFIG_CMD_LINK_LOCAL
		/*
		 * Work-around for brain-damaged Cisco equipment with
		 *   arp-proxy enabled.
		 *
		 *   If the requesting IP is not on our subnet, wait 5ms to
		 *   reply to ARP request so that our reply will overwrite
		 *   the arp-proxy's instead of the other way around.
		 */
		if ((net_read_ip(&arp->ar_tpa).s_addr & net_netmask.s_addr) !=
		    (net_read_ip(&arp->ar_spa).s_addr & net_netmask.s_addr))
			udelay(5000);
#endif
		net_send_packet((uchar *)et, eth_hdr_size + ARP_HDR_SIZE);
		return;

	case ARPOP_REPLY:		/* arp reply */
		/* are we waiting for a reply */
		if (!net_arp_wait_packet_ip.s_addr)
			break;

#ifdef CONFIG_KEEP_SERVERADDR
		if (net_server_ip.s_addr == net_arp_wait_packet_ip.s_addr) {
			char buf[20];
			sprintf(buf, "%pM", &arp->ar_sha);
			setenv("serveraddr", buf);
		}
#endif

		reply_ip_addr = net_read_ip(&arp->ar_spa);

		/* matched waiting packet's address */
		if (reply_ip_addr.s_addr == net_arp_wait_reply_ip.s_addr) {
			debug_cond(DEBUG_DEV_PKT,
				   "Got ARP REPLY, set eth addr (%pM)\n",
				   arp->ar_data);

			/* save address for later use */
			if (arp_wait_packet_ethaddr != NULL)
				memcpy(arp_wait_packet_ethaddr,
				       &arp->ar_sha, ARP_HLEN);

			net_get_arp_handler()((uchar *)arp, 0, reply_ip_addr,
					      0, len);

			/* set the mac address in the waiting packet's header
			   and transmit it */
			memcpy(((struct ethernet_hdr *)net_tx_packet)->et_dest,
			       &arp->ar_sha, ARP_HLEN);
			net_send_packet(net_tx_packet, arp_wait_tx_packet_size);

			/* no arp request pending now */
			net_arp_wait_packet_ip.s_addr = 0;
			arp_wait_tx_packet_size = 0;
			arp_wait_packet_ethaddr = NULL;
		}
		return;
	default:
		debug("Unexpected ARP opcode 0x%x\n",
		      ntohs(arp->ar_op));
		return;
	}
}