2 * Copied from Linux Monitor (LiMon) - Networking.
4 * Copyright 1994 - 2000 Neil Russell.
6 * Copyright 2000 Roland Borde
7 * Copyright 2000 Paolo Scaffardi
8 * Copyright 2000-2002 Wolfgang Denk, wd@denx.de
14 * The user interface supports commands for BOOTP, RARP, and TFTP.
15 * Also, we support ARP internally. Depending on available data,
16 * these interact as follows:
20 * Prerequisites: - own ethernet address
21 * We want: - own IP address
22 * - TFTP server IP address
28 * Prerequisites: - own ethernet address
29 * We want: - own IP address
30 * - TFTP server IP address
35 * Prerequisites: - own ethernet address
37 * - TFTP server IP address
38 * We want: - TFTP server ethernet address
43 * Prerequisites: - own ethernet address
44 * We want: - IP, Netmask, ServerIP, Gateway IP
45 * - bootfilename, lease time
50 * Prerequisites: - own ethernet address
52 * - TFTP server IP address
53 * - TFTP server ethernet address
54 * - name of bootfile (if unknown, we use a default name
55 * derived from our own IP address)
56 * We want: - load the boot file
61 * Prerequisites: - own ethernet address
63 * - name of bootfile (if unknown, we use a default name
64 * derived from our own IP address)
65 * We want: - load the boot file
70 * Prerequisites: - own ethernet address
72 * We want: - network time
80 #include <linux/compiler.h>
87 #ifdef CONFIG_STATUS_LED
88 #include <status_led.h>
91 #if defined(CONFIG_CMD_SNTP)
95 #if defined(CONFIG_CMD_DNS)
100 DECLARE_GLOBAL_DATA_PTR;
102 /** BOOTP EXTENTIONS **/
104 /* Our subnet mask (0=unknown) */
105 IPaddr_t NetOurSubnetMask;
106 /* Our gateways IP address */
107 IPaddr_t NetOurGatewayIP;
108 /* Our DNS IP address */
109 IPaddr_t NetOurDNSIP;
110 #if defined(CONFIG_BOOTP_DNS2)
111 /* Our 2nd DNS IP address */
112 IPaddr_t NetOurDNS2IP;
115 char NetOurNISDomain[32] = {0,};
117 char NetOurHostName[32] = {0,};
119 char NetOurRootPath[64] = {0,};
120 /* Our bootfile size in blocks */
121 ushort NetBootFileSize;
123 #ifdef CONFIG_MCAST_TFTP /* Multicast TFTP */
127 /** END OF BOOTP EXTENTIONS **/
129 /* The actual transferred size of the bootfile (in bytes) */
130 ulong NetBootFileXferSize;
131 /* Our ethernet address */
132 uchar NetOurEther[6];
133 /* Boot server enet address */
134 uchar NetServerEther[6];
135 /* Our IP addr (0 = unknown) */
137 /* Server IP addr (0 = unknown) */
138 IPaddr_t NetServerIP;
139 /* Current receive packet */
141 /* Current rx packet length */
145 /* Ethernet bcast address */
146 uchar NetBcastAddr[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
147 uchar NetEtherNullAddr[6];
149 void (*push_packet)(void *, int len) = 0;
151 /* Network loop state */
153 /* Tried all network devices */
155 /* Network loop restarted */
156 static int NetRestarted;
157 /* At least one device configured */
158 static int NetDevExists;
160 /* XXX in both little & big endian machines 0xFFFF == ntohs(-1) */
161 /* default is without VLAN */
162 ushort NetOurVLAN = 0xFFFF;
164 ushort NetOurNativeVLAN = 0xFFFF;
169 #if defined(CONFIG_CMD_SNTP)
170 /* NTP server IP address */
171 IPaddr_t NetNtpServerIP;
172 /* offset time from UTC */
176 uchar PktBuf[(PKTBUFSRX+1) * PKTSIZE_ALIGN + PKTALIGN];
179 uchar *NetRxPackets[PKTBUFSRX];
181 /* Current RX packet handler */
182 static rxhand_f *packetHandler;
183 #ifdef CONFIG_CMD_TFTPPUT
184 static rxhand_icmp_f *packet_icmp_handler; /* Current ICMP rx handler */
186 /* Current timeout handler */
187 static thand_f *timeHandler;
188 /* Time base value */
189 static ulong timeStart;
190 /* Current timeout value */
191 static ulong timeDelta;
192 /* THE transmit packet */
195 static int net_check_prereq(enum proto_t protocol);
197 static int NetTryCount;
199 /**********************************************************************/
202 * Check if autoload is enabled. If so, use either NFS or TFTP to download
205 void net_auto_load(void)
207 const char *s = getenv("autoload");
212 * Just use BOOTP/RARP to configure system;
213 * Do not use TFTP to load the bootfile.
215 NetState = NETLOOP_SUCCESS;
218 #if defined(CONFIG_CMD_NFS)
219 if (strcmp(s, "NFS") == 0) {
221 * Use NFS to load the bootfile.
231 static void NetInitLoop(enum proto_t protocol)
233 static int env_changed_id;
234 int env_id = get_env_id();
236 /* update only when the environment has changed */
237 if (env_changed_id != env_id) {
238 NetOurIP = getenv_IPaddr("ipaddr");
239 NetOurGatewayIP = getenv_IPaddr("gatewayip");
240 NetOurSubnetMask = getenv_IPaddr("netmask");
241 NetServerIP = getenv_IPaddr("serverip");
242 NetOurNativeVLAN = getenv_VLAN("nvlan");
243 NetOurVLAN = getenv_VLAN("vlan");
244 #if defined(CONFIG_CMD_DNS)
245 NetOurDNSIP = getenv_IPaddr("dnsip");
247 env_changed_id = env_id;
253 /**********************************************************************/
255 * Main network processing loop.
258 int NetLoop(enum proto_t protocol)
274 * Setup packet buffers, aligned correctly.
276 NetTxPacket = &PktBuf[0] + (PKTALIGN - 1);
277 NetTxPacket -= (ulong)NetTxPacket % PKTALIGN;
278 for (i = 0; i < PKTBUFSRX; i++)
279 NetRxPackets[i] = NetTxPacket + (i+1)*PKTSIZE_ALIGN;
282 bootstage_mark_name(BOOTSTAGE_ID_ETH_START, "eth_start");
285 if (eth_init(bd) < 0) {
291 memcpy(NetOurEther, eth_get_dev()->enetaddr, 6);
293 NetState = NETLOOP_CONTINUE;
296 * Start the ball rolling with the given start function. From
297 * here on, this code is a state machine driven by received
298 * packets and timer events.
300 NetInitLoop(protocol);
302 switch (net_check_prereq(protocol)) {
304 /* network not configured */
309 /* network device not configured */
314 NetBootFileXferSize = 0;
317 #ifdef CONFIG_CMD_TFTPPUT
320 /* always use ARP to get server ethernet address */
323 #ifdef CONFIG_CMD_TFTPSRV
328 #if defined(CONFIG_CMD_DHCP)
332 DhcpRequest(); /* Basically same as BOOTP */
342 #if defined(CONFIG_CMD_RARP)
349 #if defined(CONFIG_CMD_PING)
354 #if defined(CONFIG_CMD_NFS)
359 #if defined(CONFIG_CMD_CDP)
364 #ifdef CONFIG_NETCONSOLE
369 #if defined(CONFIG_CMD_SNTP)
374 #if defined(CONFIG_CMD_DNS)
386 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
387 #if defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN) && \
388 defined(CONFIG_STATUS_LED) && \
389 defined(STATUS_LED_RED)
391 * Echo the inverted link state to the fault LED.
393 if (miiphy_link(eth_get_dev()->name, CONFIG_SYS_FAULT_MII_ADDR))
394 status_led_set(STATUS_LED_RED, STATUS_LED_OFF);
396 status_led_set(STATUS_LED_RED, STATUS_LED_ON);
397 #endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */
398 #endif /* CONFIG_MII, ... */
401 * Main packet reception loop. Loop receiving packets until
402 * someone sets `NetState' to a state that terminates.
406 #ifdef CONFIG_SHOW_ACTIVITY
410 * Check the ethernet for a new packet. The ethernet
411 * receive routine will process it.
416 * Abort if ctrl-c was pressed.
427 * Check for a timeout, and run the timeout handler
430 if (timeHandler && ((get_timer(0) - timeStart) > timeDelta)) {
433 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
434 #if defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN) && \
435 defined(CONFIG_STATUS_LED) && \
436 defined(STATUS_LED_RED)
438 * Echo the inverted link state to the fault LED.
440 if (miiphy_link(eth_get_dev()->name,
441 CONFIG_SYS_FAULT_MII_ADDR)) {
442 status_led_set(STATUS_LED_RED, STATUS_LED_OFF);
444 status_led_set(STATUS_LED_RED, STATUS_LED_ON);
446 #endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */
447 #endif /* CONFIG_MII, ... */
449 timeHandler = (thand_f *)0;
456 case NETLOOP_RESTART:
460 case NETLOOP_SUCCESS:
461 if (NetBootFileXferSize > 0) {
463 printf("Bytes transferred = %ld (%lx hex)\n",
465 NetBootFileXferSize);
466 sprintf(buf, "%lX", NetBootFileXferSize);
467 setenv("filesize", buf);
469 sprintf(buf, "%lX", (unsigned long)load_addr);
470 setenv("fileaddr", buf);
473 ret = NetBootFileXferSize;
482 #ifdef CONFIG_CMD_TFTPPUT
483 /* Clear out the handlers */
485 net_set_icmp_handler(NULL);
490 /**********************************************************************/
493 startAgainTimeout(void)
495 NetState = NETLOOP_RESTART;
499 startAgainHandler(uchar *pkt, unsigned dest, IPaddr_t sip,
500 unsigned src, unsigned len)
502 /* Totally ignore the packet */
505 void NetStartAgain(void)
508 int retry_forever = 0;
509 unsigned long retrycnt = 0;
511 nretry = getenv("netretry");
513 if (!strcmp(nretry, "yes"))
515 else if (!strcmp(nretry, "no"))
517 else if (!strcmp(nretry, "once"))
520 retrycnt = simple_strtoul(nretry, NULL, 0);
524 if ((!retry_forever) && (NetTryCount >= retrycnt)) {
526 NetState = NETLOOP_FAIL;
533 #if !defined(CONFIG_NET_DO_NOT_TRY_ANOTHER)
534 eth_try_another(!NetRestarted);
537 if (NetRestartWrap) {
540 NetSetTimeout(10000UL, startAgainTimeout);
541 NetSetHandler(startAgainHandler);
543 NetState = NETLOOP_FAIL;
546 NetState = NETLOOP_RESTART;
550 /**********************************************************************/
558 return packetHandler;
563 NetSetHandler(rxhand_f *f)
568 #ifdef CONFIG_CMD_TFTPPUT
569 void net_set_icmp_handler(rxhand_icmp_f *f)
571 packet_icmp_handler = f;
576 NetSetTimeout(ulong iv, thand_f *f)
579 timeHandler = (thand_f *)0;
582 timeStart = get_timer(0);
589 NetSendPacket(uchar *pkt, int len)
591 (void) eth_send(pkt, len);
595 NetSendUDPPacket(uchar *ether, IPaddr_t dest, int dport, int sport, int len)
599 /* convert to new style broadcast */
603 /* if broadcast, make the ether address a broadcast and don't do ARP */
604 if (dest == 0xFFFFFFFF)
605 ether = NetBcastAddr;
608 * if MAC address was not discovered yet, save the packet and do
611 if (memcmp(ether, NetEtherNullAddr, 6) == 0) {
613 debug("sending ARP for %08x\n", dest);
615 NetArpWaitPacketIP = dest;
616 NetArpWaitPacketMAC = ether;
618 pkt = NetArpWaitTxPacket;
619 pkt += NetSetEther(pkt, NetArpWaitPacketMAC, PROT_IP);
621 NetSetIP(pkt, dest, dport, sport, len);
622 memcpy(pkt + IP_UDP_HDR_SIZE, (uchar *)NetTxPacket +
623 (pkt - (uchar *)NetArpWaitTxPacket) +
624 IP_UDP_HDR_SIZE, len);
626 /* size of the waiting packet */
627 NetArpWaitTxPacketSize = (pkt - NetArpWaitTxPacket) +
628 IP_UDP_HDR_SIZE + len;
630 /* and do the ARP request */
632 NetArpWaitTimerStart = get_timer(0);
634 return 1; /* waiting */
637 debug("sending UDP to %08x/%pM\n", dest, ether);
639 pkt = (uchar *)NetTxPacket;
640 pkt += NetSetEther(pkt, ether, PROT_IP);
641 NetSetIP(pkt, dest, dport, sport, len);
642 eth_send(NetTxPacket, (pkt - NetTxPacket) + IP_UDP_HDR_SIZE + len);
644 return 0; /* transmitted */
647 #ifdef CONFIG_IP_DEFRAG
649 * This function collects fragments in a single packet, according
650 * to the algorithm in RFC815. It returns NULL or the pointer to
651 * a complete packet, in static storage
653 #ifndef CONFIG_NET_MAXDEFRAG
654 #define CONFIG_NET_MAXDEFRAG 16384
657 * MAXDEFRAG, above, is chosen in the config file and is real data
658 * so we need to add the NFS overhead, which is more than TFTP.
659 * To use sizeof in the internal unnamed structures, we need a real
660 * instance (can't do "sizeof(struct rpc_t.u.reply))", unfortunately).
661 * The compiler doesn't complain nor allocates the actual structure
663 static struct rpc_t rpc_specimen;
664 #define IP_PKTSIZE (CONFIG_NET_MAXDEFRAG + sizeof(rpc_specimen.u.reply))
666 #define IP_MAXUDP (IP_PKTSIZE - IP_HDR_SIZE)
669 * this is the packet being assembled, either data or frag control.
670 * Fragments go by 8 bytes, so this union must be 8 bytes long
673 /* first_byte is address of this structure */
674 u16 last_byte; /* last byte in this hole + 1 (begin of next hole) */
675 u16 next_hole; /* index of next (in 8-b blocks), 0 == none */
676 u16 prev_hole; /* index of prev, 0 == none */
680 static struct ip_udp_hdr *__NetDefragment(struct ip_udp_hdr *ip, int *lenp)
682 static uchar pkt_buff[IP_PKTSIZE] __aligned(PKTALIGN);
683 static u16 first_hole, total_len;
684 struct hole *payload, *thisfrag, *h, *newh;
685 struct ip_udp_hdr *localip = (struct ip_udp_hdr *)pkt_buff;
686 uchar *indata = (uchar *)ip;
687 int offset8, start, len, done = 0;
688 u16 ip_off = ntohs(ip->ip_off);
690 /* payload starts after IP header, this fragment is in there */
691 payload = (struct hole *)(pkt_buff + IP_HDR_SIZE);
692 offset8 = (ip_off & IP_OFFS);
693 thisfrag = payload + offset8;
695 len = ntohs(ip->ip_len) - IP_HDR_SIZE;
697 if (start + len > IP_MAXUDP) /* fragment extends too far */
700 if (!total_len || localip->ip_id != ip->ip_id) {
701 /* new (or different) packet, reset structs */
703 payload[0].last_byte = ~0;
704 payload[0].next_hole = 0;
705 payload[0].prev_hole = 0;
707 /* any IP header will work, copy the first we received */
708 memcpy(localip, ip, IP_HDR_SIZE);
712 * What follows is the reassembly algorithm. We use the payload
713 * array as a linked list of hole descriptors, as each hole starts
714 * at a multiple of 8 bytes. However, last byte can be whatever value,
715 * so it is represented as byte count, not as 8-byte blocks.
718 h = payload + first_hole;
719 while (h->last_byte < start) {
721 /* no hole that far away */
724 h = payload + h->next_hole;
727 /* last fragment may be 1..7 bytes, the "+7" forces acceptance */
728 if (offset8 + ((len + 7) / 8) <= h - payload) {
729 /* no overlap with holes (dup fragment?) */
733 if (!(ip_off & IP_FLAGS_MFRAG)) {
734 /* no more fragmentss: truncate this (last) hole */
735 total_len = start + len;
736 h->last_byte = start + len;
740 * There is some overlap: fix the hole list. This code doesn't
741 * deal with a fragment that overlaps with two different holes
742 * (thus being a superset of a previously-received fragment).
745 if ((h >= thisfrag) && (h->last_byte <= start + len)) {
746 /* complete overlap with hole: remove hole */
747 if (!h->prev_hole && !h->next_hole) {
748 /* last remaining hole */
750 } else if (!h->prev_hole) {
752 first_hole = h->next_hole;
753 payload[h->next_hole].prev_hole = 0;
754 } else if (!h->next_hole) {
756 payload[h->prev_hole].next_hole = 0;
758 /* in the middle of the list */
759 payload[h->next_hole].prev_hole = h->prev_hole;
760 payload[h->prev_hole].next_hole = h->next_hole;
763 } else if (h->last_byte <= start + len) {
764 /* overlaps with final part of the hole: shorten this hole */
765 h->last_byte = start;
767 } else if (h >= thisfrag) {
768 /* overlaps with initial part of the hole: move this hole */
769 newh = thisfrag + (len / 8);
773 payload[h->next_hole].prev_hole = (h - payload);
775 payload[h->prev_hole].next_hole = (h - payload);
777 first_hole = (h - payload);
780 /* fragment sits in the middle: split the hole */
781 newh = thisfrag + (len / 8);
783 h->last_byte = start;
784 h->next_hole = (newh - payload);
785 newh->prev_hole = (h - payload);
787 payload[newh->next_hole].prev_hole = (newh - payload);
790 /* finally copy this fragment and possibly return whole packet */
791 memcpy((uchar *)thisfrag, indata + IP_HDR_SIZE, len);
795 localip->ip_len = htons(total_len);
796 *lenp = total_len + IP_HDR_SIZE;
800 static inline struct ip_udp_hdr *NetDefragment(struct ip_udp_hdr *ip, int *lenp)
802 u16 ip_off = ntohs(ip->ip_off);
803 if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG)))
804 return ip; /* not a fragment */
805 return __NetDefragment(ip, lenp);
808 #else /* !CONFIG_IP_DEFRAG */
810 static inline struct ip_udp_hdr *NetDefragment(struct ip_udp_hdr *ip, int *lenp)
812 u16 ip_off = ntohs(ip->ip_off);
813 if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG)))
814 return ip; /* not a fragment */
820 * Receive an ICMP packet. We deal with REDIRECT and PING here, and silently
823 * @parma ip IP packet containing the ICMP
825 static void receive_icmp(struct ip_udp_hdr *ip, int len,
826 IPaddr_t src_ip, struct ethernet_hdr *et)
828 struct icmp_hdr *icmph = (struct icmp_hdr *)&ip->udp_src;
830 switch (icmph->type) {
832 if (icmph->code != ICMP_REDIR_HOST)
834 printf(" ICMP Host Redirect to %pI4 ",
838 #if defined(CONFIG_CMD_PING)
839 ping_receive(et, ip, len);
841 #ifdef CONFIG_CMD_TFTPPUT
842 if (packet_icmp_handler)
843 packet_icmp_handler(icmph->type, icmph->code,
844 ntohs(ip->udp_dst), src_ip, ntohs(ip->udp_src),
845 icmph->un.data, ntohs(ip->udp_len));
852 NetReceive(uchar *inpkt, int len)
854 struct ethernet_hdr *et;
855 struct ip_udp_hdr *ip;
859 #if defined(CONFIG_CMD_CDP)
862 ushort cti = 0, vlanid = VLAN_NONE, myvlanid, mynvlanid;
864 debug("packet received\n");
867 NetRxPacketLen = len;
868 et = (struct ethernet_hdr *)inpkt;
870 /* too small packet? */
871 if (len < ETHER_HDR_SIZE)
876 (*push_packet)(inpkt, len);
881 #if defined(CONFIG_CMD_CDP)
882 /* keep track if packet is CDP */
883 iscdp = is_cdp_packet(et->et_dest);
886 myvlanid = ntohs(NetOurVLAN);
887 if (myvlanid == (ushort)-1)
888 myvlanid = VLAN_NONE;
889 mynvlanid = ntohs(NetOurNativeVLAN);
890 if (mynvlanid == (ushort)-1)
891 mynvlanid = VLAN_NONE;
893 x = ntohs(et->et_protlen);
895 debug("packet received\n");
898 struct e802_hdr *et802 = (struct e802_hdr *)et;
900 * Got a 802 packet. Check the other protocol field.
902 x = ntohs(et802->et_prot);
904 ip = (struct ip_udp_hdr *)(inpkt + E802_HDR_SIZE);
905 len -= E802_HDR_SIZE;
907 } else if (x != PROT_VLAN) { /* normal packet */
908 ip = (struct ip_udp_hdr *)(inpkt + ETHER_HDR_SIZE);
909 len -= ETHER_HDR_SIZE;
911 } else { /* VLAN packet */
912 struct vlan_ethernet_hdr *vet =
913 (struct vlan_ethernet_hdr *)et;
915 debug("VLAN packet received\n");
917 /* too small packet? */
918 if (len < VLAN_ETHER_HDR_SIZE)
921 /* if no VLAN active */
922 if ((ntohs(NetOurVLAN) & VLAN_IDMASK) == VLAN_NONE
923 #if defined(CONFIG_CMD_CDP)
929 cti = ntohs(vet->vet_tag);
930 vlanid = cti & VLAN_IDMASK;
931 x = ntohs(vet->vet_type);
933 ip = (struct ip_udp_hdr *)(inpkt + VLAN_ETHER_HDR_SIZE);
934 len -= VLAN_ETHER_HDR_SIZE;
937 debug("Receive from protocol 0x%x\n", x);
939 #if defined(CONFIG_CMD_CDP)
941 CDPHandler((uchar *)ip, len);
946 if ((myvlanid & VLAN_IDMASK) != VLAN_NONE) {
947 if (vlanid == VLAN_NONE)
948 vlanid = (mynvlanid & VLAN_IDMASK);
950 if (vlanid != (myvlanid & VLAN_IDMASK))
957 ArpReceive(et, ip, len);
960 #ifdef CONFIG_CMD_RARP
962 rarp_receive(ip, len);
967 /* Before we start poking the header, make sure it is there */
968 if (len < IP_UDP_HDR_SIZE) {
969 debug("len bad %d < %lu\n", len,
970 (ulong)IP_UDP_HDR_SIZE);
973 /* Check the packet length */
974 if (len < ntohs(ip->ip_len)) {
975 printf("len bad %d < %d\n", len, ntohs(ip->ip_len));
978 len = ntohs(ip->ip_len);
979 debug("len=%d, v=%02x\n", len, ip->ip_hl_v & 0xff);
981 /* Can't deal with anything except IPv4 */
982 if ((ip->ip_hl_v & 0xf0) != 0x40)
984 /* Can't deal with IP options (headers != 20 bytes) */
985 if ((ip->ip_hl_v & 0x0f) > 0x05)
987 /* Check the Checksum of the header */
988 if (!NetCksumOk((uchar *)ip, IP_HDR_SIZE / 2)) {
989 puts("checksum bad\n");
992 /* If it is not for us, ignore it */
993 tmp = NetReadIP(&ip->ip_dst);
994 if (NetOurIP && tmp != NetOurIP && tmp != 0xFFFFFFFF) {
995 #ifdef CONFIG_MCAST_TFTP
996 if (Mcast_addr != tmp)
1000 /* Read source IP address for later use */
1001 src_ip = NetReadIP(&ip->ip_src);
1003 * The function returns the unchanged packet if it's not
1004 * a fragment, and either the complete packet or NULL if
1005 * it is a fragment (if !CONFIG_IP_DEFRAG, it returns NULL)
1007 ip = NetDefragment(ip, &len);
1011 * watch for ICMP host redirects
1013 * There is no real handler code (yet). We just watch
1014 * for ICMP host redirect messages. In case anybody
1015 * sees these messages: please contact me
1016 * (wd@denx.de), or - even better - send me the
1017 * necessary fixes :-)
1019 * Note: in all cases where I have seen this so far
1020 * it was a problem with the router configuration,
1021 * for instance when a router was configured in the
1022 * BOOTP reply, but the TFTP server was on the same
1023 * subnet. So this is probably a warning that your
1024 * configuration might be wrong. But I'm not really
1025 * sure if there aren't any other situations.
1027 * Simon Glass <sjg@chromium.org>: We get an ICMP when
1028 * we send a tftp packet to a dead connection, or when
1029 * there is no server at the other end.
1031 if (ip->ip_p == IPPROTO_ICMP) {
1032 receive_icmp(ip, len, src_ip, et);
1034 } else if (ip->ip_p != IPPROTO_UDP) { /* Only UDP packets */
1038 #ifdef CONFIG_UDP_CHECKSUM
1039 if (ip->udp_xsum != 0) {
1045 xsum += (ntohs(ip->udp_len));
1046 xsum += (ntohl(ip->ip_src) >> 16) & 0x0000ffff;
1047 xsum += (ntohl(ip->ip_src) >> 0) & 0x0000ffff;
1048 xsum += (ntohl(ip->ip_dst) >> 16) & 0x0000ffff;
1049 xsum += (ntohl(ip->ip_dst) >> 0) & 0x0000ffff;
1051 sumlen = ntohs(ip->udp_len);
1052 sumptr = (ushort *) &(ip->udp_src);
1054 while (sumlen > 1) {
1057 sumdata = *sumptr++;
1058 xsum += ntohs(sumdata);
1064 sumdata = *(unsigned char *) sumptr;
1065 sumdata = (sumdata << 8) & 0xff00;
1068 while ((xsum >> 16) != 0) {
1069 xsum = (xsum & 0x0000ffff) +
1070 ((xsum >> 16) & 0x0000ffff);
1072 if ((xsum != 0x00000000) && (xsum != 0x0000ffff)) {
1073 printf(" UDP wrong checksum %08lx %08x\n",
1074 xsum, ntohs(ip->udp_xsum));
1081 #ifdef CONFIG_NETCONSOLE
1082 nc_input_packet((uchar *)ip + IP_UDP_HDR_SIZE,
1085 ntohs(ip->udp_len) - UDP_HDR_SIZE);
1088 * IP header OK. Pass the packet to the current handler.
1090 (*packetHandler)((uchar *)ip + IP_UDP_HDR_SIZE,
1094 ntohs(ip->udp_len) - UDP_HDR_SIZE);
1100 /**********************************************************************/
1102 static int net_check_prereq(enum proto_t protocol)
1106 #if defined(CONFIG_CMD_PING)
1108 if (NetPingIP == 0) {
1109 puts("*** ERROR: ping address not given\n");
1114 #if defined(CONFIG_CMD_SNTP)
1116 if (NetNtpServerIP == 0) {
1117 puts("*** ERROR: NTP server address not given\n");
1122 #if defined(CONFIG_CMD_DNS)
1124 if (NetOurDNSIP == 0) {
1125 puts("*** ERROR: DNS server address not given\n");
1130 #if defined(CONFIG_CMD_NFS)
1135 if (NetServerIP == 0) {
1136 puts("*** ERROR: `serverip' not set\n");
1139 #if defined(CONFIG_CMD_PING) || defined(CONFIG_CMD_SNTP) || \
1140 defined(CONFIG_CMD_DNS)
1147 if (NetOurIP == 0) {
1148 puts("*** ERROR: `ipaddr' not set\n");
1153 #ifdef CONFIG_CMD_RARP
1159 if (memcmp(NetOurEther, "\0\0\0\0\0\0", 6) == 0) {
1160 int num = eth_get_dev_index();
1164 puts("*** ERROR: No ethernet found.\n");
1167 puts("*** ERROR: `ethaddr' not set\n");
1170 printf("*** ERROR: `eth%daddr' not set\n",
1184 /**********************************************************************/
1187 NetCksumOk(uchar *ptr, int len)
1189 return !((NetCksum(ptr, len) + 1) & 0xfffe);
1194 NetCksum(uchar *ptr, int len)
1197 ushort *p = (ushort *)ptr;
1202 xsum = (xsum & 0xffff) + (xsum >> 16);
1203 xsum = (xsum & 0xffff) + (xsum >> 16);
1204 return xsum & 0xffff;
1212 myvlanid = ntohs(NetOurVLAN);
1213 if (myvlanid == (ushort)-1)
1214 myvlanid = VLAN_NONE;
1216 return ((myvlanid & VLAN_IDMASK) == VLAN_NONE) ? ETHER_HDR_SIZE :
1217 VLAN_ETHER_HDR_SIZE;
1221 NetSetEther(uchar *xet, uchar * addr, uint prot)
1223 struct ethernet_hdr *et = (struct ethernet_hdr *)xet;
1226 myvlanid = ntohs(NetOurVLAN);
1227 if (myvlanid == (ushort)-1)
1228 myvlanid = VLAN_NONE;
1230 memcpy(et->et_dest, addr, 6);
1231 memcpy(et->et_src, NetOurEther, 6);
1232 if ((myvlanid & VLAN_IDMASK) == VLAN_NONE) {
1233 et->et_protlen = htons(prot);
1234 return ETHER_HDR_SIZE;
1236 struct vlan_ethernet_hdr *vet =
1237 (struct vlan_ethernet_hdr *)xet;
1239 vet->vet_vlan_type = htons(PROT_VLAN);
1240 vet->vet_tag = htons((0 << 5) | (myvlanid & VLAN_IDMASK));
1241 vet->vet_type = htons(prot);
1242 return VLAN_ETHER_HDR_SIZE;
1246 void NetSetIP(uchar *xip, IPaddr_t dest, int dport, int sport, int len)
1248 struct ip_udp_hdr *ip = (struct ip_udp_hdr *)xip;
1251 * If the data is an odd number of bytes, zero the
1252 * byte after the last byte so that the checksum
1256 xip[IP_UDP_HDR_SIZE + len] = 0;
1259 * Construct an IP and UDP header.
1260 * (need to set no fragment bit - XXX)
1262 /* IP_HDR_SIZE / 4 (not including UDP) */
1265 ip->ip_len = htons(IP_UDP_HDR_SIZE + len);
1266 ip->ip_id = htons(NetIPID++);
1267 ip->ip_off = htons(IP_FLAGS_DFRAG); /* Don't fragment */
1269 ip->ip_p = 17; /* UDP */
1271 /* already in network byte order */
1272 NetCopyIP((void *)&ip->ip_src, &NetOurIP);
1274 NetCopyIP((void *)&ip->ip_dst, &dest);
1275 ip->udp_src = htons(sport);
1276 ip->udp_dst = htons(dport);
1277 ip->udp_len = htons(UDP_HDR_SIZE + len);
1279 ip->ip_sum = ~NetCksum((uchar *)ip, IP_HDR_SIZE / 2);
1282 void copy_filename(char *dst, const char *src, int size)
1284 if (*src && (*src == '"')) {
1289 while ((--size > 0) && *src && (*src != '"'))
1294 #if defined(CONFIG_CMD_NFS) || \
1295 defined(CONFIG_CMD_SNTP) || \
1296 defined(CONFIG_CMD_DNS)
1298 * make port a little random (1024-17407)
1299 * This keeps the math somewhat trivial to compute, and seems to work with
1300 * all supported protocols/clients/servers
1302 unsigned int random_port(void)
1304 return 1024 + (get_timer(0) % 0x4000);
1308 void ip_to_string(IPaddr_t x, char *s)
1311 sprintf(s, "%d.%d.%d.%d",
1312 (int) ((x >> 24) & 0xff),
1313 (int) ((x >> 16) & 0xff),
1314 (int) ((x >> 8) & 0xff), (int) ((x >> 0) & 0xff)
1318 void VLAN_to_string(ushort x, char *s)
1322 if (x == (ushort)-1)
1328 sprintf(s, "%d", x & VLAN_IDMASK);
1331 ushort string_to_VLAN(const char *s)
1336 return htons(VLAN_NONE);
1338 if (*s < '0' || *s > '9')
1341 id = (ushort)simple_strtoul(s, NULL, 10);
1346 ushort getenv_VLAN(char *var)
1348 return string_to_VLAN(getenv(var));