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
34 * Prerequisites: - own ethernet address
35 * We want: - own IP address
36 * - TFTP server IP address
41 * Prerequisites: - own ethernet address
43 * - TFTP server IP address
44 * We want: - TFTP server ethernet address
49 * Prerequisites: - own ethernet address
50 * We want: - IP, Netmask, ServerIP, Gateway IP
51 * - bootfilename, lease time
56 * Prerequisites: - own ethernet address
58 * - TFTP server IP address
59 * - TFTP server ethernet address
60 * - name of bootfile (if unknown, we use a default name
61 * derived from our own IP address)
62 * We want: - load the boot file
67 * Prerequisites: - own ethernet address
69 * - name of bootfile (if unknown, we use a default name
70 * derived from our own IP address)
71 * We want: - load the boot file
76 * Prerequisites: - own ethernet address
78 * We want: - network time
86 #if defined(CONFIG_STATUS_LED)
88 #include <status_led.h>
91 #include <linux/compiler.h>
95 #if defined(CONFIG_CMD_DNS)
98 #include "link_local.h"
102 #if defined(CONFIG_CMD_SNTP)
107 DECLARE_GLOBAL_DATA_PTR;
109 /** BOOTP EXTENTIONS **/
111 /* Our subnet mask (0=unknown) */
112 IPaddr_t NetOurSubnetMask;
113 /* Our gateways IP address */
114 IPaddr_t NetOurGatewayIP;
115 /* Our DNS IP address */
116 IPaddr_t NetOurDNSIP;
117 #if defined(CONFIG_BOOTP_DNS2)
118 /* Our 2nd DNS IP address */
119 IPaddr_t NetOurDNS2IP;
122 char NetOurNISDomain[32] = {0,};
124 char NetOurHostName[32] = {0,};
126 char NetOurRootPath[64] = {0,};
127 /* Our bootfile size in blocks */
128 ushort NetBootFileSize;
130 #ifdef CONFIG_MCAST_TFTP /* Multicast TFTP */
134 /** END OF BOOTP EXTENTIONS **/
136 /* The actual transferred size of the bootfile (in bytes) */
137 ulong NetBootFileXferSize;
138 /* Our ethernet address */
139 uchar NetOurEther[6];
140 /* Boot server enet address */
141 uchar NetServerEther[6];
142 /* Our IP addr (0 = unknown) */
144 /* Server IP addr (0 = unknown) */
145 IPaddr_t NetServerIP;
146 /* Current receive packet */
148 /* Current rx packet length */
152 /* Ethernet bcast address */
153 uchar NetBcastAddr[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
154 uchar NetEtherNullAddr[6];
156 void (*push_packet)(void *, int len) = 0;
158 /* Network loop state */
159 enum net_loop_state net_state;
160 /* Tried all network devices */
162 /* Network loop restarted */
163 static int NetRestarted;
164 /* At least one device configured */
165 static int NetDevExists;
167 /* XXX in both little & big endian machines 0xFFFF == ntohs(-1) */
168 /* default is without VLAN */
169 ushort NetOurVLAN = 0xFFFF;
171 ushort NetOurNativeVLAN = 0xFFFF;
176 #if defined(CONFIG_CMD_SNTP)
177 /* NTP server IP address */
178 IPaddr_t NetNtpServerIP;
179 /* offset time from UTC */
183 uchar PktBuf[(PKTBUFSRX+1) * PKTSIZE_ALIGN + PKTALIGN];
186 uchar *NetRxPackets[PKTBUFSRX];
188 /* Current UDP RX packet handler */
189 static rxhand_f *udp_packet_handler;
190 /* Current ARP RX packet handler */
191 static rxhand_f *arp_packet_handler;
192 #ifdef CONFIG_CMD_TFTPPUT
193 /* Current ICMP rx handler */
194 static rxhand_icmp_f *packet_icmp_handler;
196 /* Current timeout handler */
197 static thand_f *timeHandler;
198 /* Time base value */
199 static ulong timeStart;
200 /* Current timeout value */
201 static ulong timeDelta;
202 /* THE transmit packet */
205 static int net_check_prereq(enum proto_t protocol);
207 static int NetTryCount;
209 /**********************************************************************/
212 * Check if autoload is enabled. If so, use either NFS or TFTP to download
215 void net_auto_load(void)
217 const char *s = getenv("autoload");
222 * Just use BOOTP/RARP to configure system;
223 * Do not use TFTP to load the bootfile.
225 net_set_state(NETLOOP_SUCCESS);
228 #if defined(CONFIG_CMD_NFS)
229 if (strcmp(s, "NFS") == 0) {
231 * Use NFS to load the bootfile.
241 static void NetInitLoop(void)
243 static int env_changed_id;
244 int env_id = get_env_id();
246 /* update only when the environment has changed */
247 if (env_changed_id != env_id) {
248 NetOurIP = getenv_IPaddr("ipaddr");
249 NetOurGatewayIP = getenv_IPaddr("gatewayip");
250 NetOurSubnetMask = getenv_IPaddr("netmask");
251 NetServerIP = getenv_IPaddr("serverip");
252 NetOurNativeVLAN = getenv_VLAN("nvlan");
253 NetOurVLAN = getenv_VLAN("vlan");
254 #if defined(CONFIG_CMD_DNS)
255 NetOurDNSIP = getenv_IPaddr("dnsip");
257 env_changed_id = env_id;
263 static void net_clear_handlers(void)
265 net_set_udp_handler(NULL);
266 net_set_arp_handler(NULL);
267 NetSetTimeout(0, NULL);
270 static void net_cleanup_loop(void)
272 net_clear_handlers();
277 static int first_call = 1;
281 * Setup packet buffers, aligned correctly.
285 NetTxPacket = &PktBuf[0] + (PKTALIGN - 1);
286 NetTxPacket -= (ulong)NetTxPacket % PKTALIGN;
287 for (i = 0; i < PKTBUFSRX; i++)
288 NetRxPackets[i] = NetTxPacket + (i + 1) * PKTSIZE_ALIGN;
291 net_clear_handlers();
293 /* Only need to setup buffer pointers once. */
300 /**********************************************************************/
302 * Main network processing loop.
305 int NetLoop(enum proto_t protocol)
314 bootstage_mark_name(BOOTSTAGE_ID_ETH_START, "eth_start");
318 if (eth_init(bd) < 0) {
324 memcpy(NetOurEther, eth_get_dev()->enetaddr, 6);
326 net_set_state(NETLOOP_CONTINUE);
329 * Start the ball rolling with the given start function. From
330 * here on, this code is a state machine driven by received
331 * packets and timer events.
335 switch (net_check_prereq(protocol)) {
337 /* network not configured */
342 /* network device not configured */
347 NetBootFileXferSize = 0;
350 #ifdef CONFIG_CMD_TFTPPUT
353 /* always use ARP to get server ethernet address */
356 #ifdef CONFIG_CMD_TFTPSRV
361 #if defined(CONFIG_CMD_DHCP)
365 DhcpRequest(); /* Basically same as BOOTP */
375 #if defined(CONFIG_CMD_RARP)
382 #if defined(CONFIG_CMD_PING)
387 #if defined(CONFIG_CMD_NFS)
392 #if defined(CONFIG_CMD_CDP)
397 #ifdef CONFIG_NETCONSOLE
402 #if defined(CONFIG_CMD_SNTP)
407 #if defined(CONFIG_CMD_DNS)
412 #if defined(CONFIG_CMD_LINK_LOCAL)
424 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
425 #if defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN) && \
426 defined(CONFIG_STATUS_LED) && \
427 defined(STATUS_LED_RED)
429 * Echo the inverted link state to the fault LED.
431 if (miiphy_link(eth_get_dev()->name, CONFIG_SYS_FAULT_MII_ADDR))
432 status_led_set(STATUS_LED_RED, STATUS_LED_OFF);
434 status_led_set(STATUS_LED_RED, STATUS_LED_ON);
435 #endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */
436 #endif /* CONFIG_MII, ... */
439 * Main packet reception loop. Loop receiving packets until
440 * someone sets `net_state' to a state that terminates.
444 #ifdef CONFIG_SHOW_ACTIVITY
448 * Check the ethernet for a new packet. The ethernet
449 * receive routine will process it.
454 * Abort if ctrl-c was pressed.
457 /* cancel any ARP that may not have completed */
458 NetArpWaitPacketIP = 0;
469 * Check for a timeout, and run the timeout handler
472 if (timeHandler && ((get_timer(0) - timeStart) > timeDelta)) {
475 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
476 #if defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN) && \
477 defined(CONFIG_STATUS_LED) && \
478 defined(STATUS_LED_RED)
480 * Echo the inverted link state to the fault LED.
482 if (miiphy_link(eth_get_dev()->name,
483 CONFIG_SYS_FAULT_MII_ADDR)) {
484 status_led_set(STATUS_LED_RED, STATUS_LED_OFF);
486 status_led_set(STATUS_LED_RED, STATUS_LED_ON);
488 #endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */
489 #endif /* CONFIG_MII, ... */
491 timeHandler = (thand_f *)0;
498 case NETLOOP_RESTART:
502 case NETLOOP_SUCCESS:
504 if (NetBootFileXferSize > 0) {
506 printf("Bytes transferred = %ld (%lx hex)\n",
508 NetBootFileXferSize);
509 sprintf(buf, "%lX", NetBootFileXferSize);
510 setenv("filesize", buf);
512 sprintf(buf, "%lX", (unsigned long)load_addr);
513 setenv("fileaddr", buf);
516 ret = NetBootFileXferSize;
523 case NETLOOP_CONTINUE:
529 #ifdef CONFIG_CMD_TFTPPUT
530 /* Clear out the handlers */
531 net_set_udp_handler(NULL);
532 net_set_icmp_handler(NULL);
537 /**********************************************************************/
540 startAgainTimeout(void)
542 net_set_state(NETLOOP_RESTART);
545 void NetStartAgain(void)
548 int retry_forever = 0;
549 unsigned long retrycnt = 0;
551 nretry = getenv("netretry");
553 if (!strcmp(nretry, "yes"))
555 else if (!strcmp(nretry, "no"))
557 else if (!strcmp(nretry, "once"))
560 retrycnt = simple_strtoul(nretry, NULL, 0);
564 if ((!retry_forever) && (NetTryCount >= retrycnt)) {
566 net_set_state(NETLOOP_FAIL);
573 #if !defined(CONFIG_NET_DO_NOT_TRY_ANOTHER)
574 eth_try_another(!NetRestarted);
577 if (NetRestartWrap) {
580 NetSetTimeout(10000UL, startAgainTimeout);
581 net_set_udp_handler(NULL);
583 net_set_state(NETLOOP_FAIL);
586 net_set_state(NETLOOP_RESTART);
590 /**********************************************************************/
595 static void dummy_handler(uchar *pkt, unsigned dport,
596 IPaddr_t sip, unsigned sport,
601 rxhand_f *net_get_udp_handler(void)
603 return udp_packet_handler;
606 void net_set_udp_handler(rxhand_f *f)
609 udp_packet_handler = dummy_handler;
611 udp_packet_handler = f;
614 rxhand_f *net_get_arp_handler(void)
616 return arp_packet_handler;
619 void net_set_arp_handler(rxhand_f *f)
622 arp_packet_handler = dummy_handler;
624 arp_packet_handler = f;
627 #ifdef CONFIG_CMD_TFTPPUT
628 void net_set_icmp_handler(rxhand_icmp_f *f)
630 packet_icmp_handler = f;
635 NetSetTimeout(ulong iv, thand_f *f)
638 timeHandler = (thand_f *)0;
641 timeStart = get_timer(0);
646 int NetSendUDPPacket(uchar *ether, IPaddr_t dest, int dport, int sport,
653 /* make sure the NetTxPacket is initialized (NetInit() was called) */
654 assert(NetTxPacket != NULL);
655 if (NetTxPacket == NULL)
658 /* convert to new style broadcast */
662 /* if broadcast, make the ether address a broadcast and don't do ARP */
663 if (dest == 0xFFFFFFFF)
664 ether = NetBcastAddr;
666 pkt = (uchar *)NetTxPacket;
668 eth_hdr_size = NetSetEther(pkt, ether, PROT_IP);
670 net_set_udp_header(pkt, dest, dport, sport, payload_len);
671 pkt_hdr_size = eth_hdr_size + IP_UDP_HDR_SIZE;
673 /* if MAC address was not discovered yet, do an ARP request */
674 if (memcmp(ether, NetEtherNullAddr, 6) == 0) {
675 debug("sending ARP for %pI4\n", &dest);
677 /* save the ip and eth addr for the packet to send after arp */
678 NetArpWaitPacketIP = dest;
679 NetArpWaitPacketMAC = ether;
681 /* size of the waiting packet */
682 NetArpWaitTxPacketSize = pkt_hdr_size + payload_len;
684 /* and do the ARP request */
686 NetArpWaitTimerStart = get_timer(0);
688 return 1; /* waiting */
690 debug("sending UDP to %pI4/%pM\n", &dest, ether);
691 NetSendPacket(NetTxPacket, pkt_hdr_size + payload_len);
692 return 0; /* transmitted */
696 #ifdef CONFIG_IP_DEFRAG
698 * This function collects fragments in a single packet, according
699 * to the algorithm in RFC815. It returns NULL or the pointer to
700 * a complete packet, in static storage
702 #ifndef CONFIG_NET_MAXDEFRAG
703 #define CONFIG_NET_MAXDEFRAG 16384
706 * MAXDEFRAG, above, is chosen in the config file and is real data
707 * so we need to add the NFS overhead, which is more than TFTP.
708 * To use sizeof in the internal unnamed structures, we need a real
709 * instance (can't do "sizeof(struct rpc_t.u.reply))", unfortunately).
710 * The compiler doesn't complain nor allocates the actual structure
712 static struct rpc_t rpc_specimen;
713 #define IP_PKTSIZE (CONFIG_NET_MAXDEFRAG + sizeof(rpc_specimen.u.reply))
715 #define IP_MAXUDP (IP_PKTSIZE - IP_HDR_SIZE)
718 * this is the packet being assembled, either data or frag control.
719 * Fragments go by 8 bytes, so this union must be 8 bytes long
722 /* first_byte is address of this structure */
723 u16 last_byte; /* last byte in this hole + 1 (begin of next hole) */
724 u16 next_hole; /* index of next (in 8-b blocks), 0 == none */
725 u16 prev_hole; /* index of prev, 0 == none */
729 static struct ip_udp_hdr *__NetDefragment(struct ip_udp_hdr *ip, int *lenp)
731 static uchar pkt_buff[IP_PKTSIZE] __aligned(PKTALIGN);
732 static u16 first_hole, total_len;
733 struct hole *payload, *thisfrag, *h, *newh;
734 struct ip_udp_hdr *localip = (struct ip_udp_hdr *)pkt_buff;
735 uchar *indata = (uchar *)ip;
736 int offset8, start, len, done = 0;
737 u16 ip_off = ntohs(ip->ip_off);
739 /* payload starts after IP header, this fragment is in there */
740 payload = (struct hole *)(pkt_buff + IP_HDR_SIZE);
741 offset8 = (ip_off & IP_OFFS);
742 thisfrag = payload + offset8;
744 len = ntohs(ip->ip_len) - IP_HDR_SIZE;
746 if (start + len > IP_MAXUDP) /* fragment extends too far */
749 if (!total_len || localip->ip_id != ip->ip_id) {
750 /* new (or different) packet, reset structs */
752 payload[0].last_byte = ~0;
753 payload[0].next_hole = 0;
754 payload[0].prev_hole = 0;
756 /* any IP header will work, copy the first we received */
757 memcpy(localip, ip, IP_HDR_SIZE);
761 * What follows is the reassembly algorithm. We use the payload
762 * array as a linked list of hole descriptors, as each hole starts
763 * at a multiple of 8 bytes. However, last byte can be whatever value,
764 * so it is represented as byte count, not as 8-byte blocks.
767 h = payload + first_hole;
768 while (h->last_byte < start) {
770 /* no hole that far away */
773 h = payload + h->next_hole;
776 /* last fragment may be 1..7 bytes, the "+7" forces acceptance */
777 if (offset8 + ((len + 7) / 8) <= h - payload) {
778 /* no overlap with holes (dup fragment?) */
782 if (!(ip_off & IP_FLAGS_MFRAG)) {
783 /* no more fragmentss: truncate this (last) hole */
784 total_len = start + len;
785 h->last_byte = start + len;
789 * There is some overlap: fix the hole list. This code doesn't
790 * deal with a fragment that overlaps with two different holes
791 * (thus being a superset of a previously-received fragment).
794 if ((h >= thisfrag) && (h->last_byte <= start + len)) {
795 /* complete overlap with hole: remove hole */
796 if (!h->prev_hole && !h->next_hole) {
797 /* last remaining hole */
799 } else if (!h->prev_hole) {
801 first_hole = h->next_hole;
802 payload[h->next_hole].prev_hole = 0;
803 } else if (!h->next_hole) {
805 payload[h->prev_hole].next_hole = 0;
807 /* in the middle of the list */
808 payload[h->next_hole].prev_hole = h->prev_hole;
809 payload[h->prev_hole].next_hole = h->next_hole;
812 } else if (h->last_byte <= start + len) {
813 /* overlaps with final part of the hole: shorten this hole */
814 h->last_byte = start;
816 } else if (h >= thisfrag) {
817 /* overlaps with initial part of the hole: move this hole */
818 newh = thisfrag + (len / 8);
822 payload[h->next_hole].prev_hole = (h - payload);
824 payload[h->prev_hole].next_hole = (h - payload);
826 first_hole = (h - payload);
829 /* fragment sits in the middle: split the hole */
830 newh = thisfrag + (len / 8);
832 h->last_byte = start;
833 h->next_hole = (newh - payload);
834 newh->prev_hole = (h - payload);
836 payload[newh->next_hole].prev_hole = (newh - payload);
839 /* finally copy this fragment and possibly return whole packet */
840 memcpy((uchar *)thisfrag, indata + IP_HDR_SIZE, len);
844 localip->ip_len = htons(total_len);
845 *lenp = total_len + IP_HDR_SIZE;
849 static inline struct ip_udp_hdr *NetDefragment(struct ip_udp_hdr *ip, int *lenp)
851 u16 ip_off = ntohs(ip->ip_off);
852 if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG)))
853 return ip; /* not a fragment */
854 return __NetDefragment(ip, lenp);
857 #else /* !CONFIG_IP_DEFRAG */
859 static inline struct ip_udp_hdr *NetDefragment(struct ip_udp_hdr *ip, int *lenp)
861 u16 ip_off = ntohs(ip->ip_off);
862 if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG)))
863 return ip; /* not a fragment */
869 * Receive an ICMP packet. We deal with REDIRECT and PING here, and silently
872 * @parma ip IP packet containing the ICMP
874 static void receive_icmp(struct ip_udp_hdr *ip, int len,
875 IPaddr_t src_ip, struct ethernet_hdr *et)
877 struct icmp_hdr *icmph = (struct icmp_hdr *)&ip->udp_src;
879 switch (icmph->type) {
881 if (icmph->code != ICMP_REDIR_HOST)
883 printf(" ICMP Host Redirect to %pI4 ",
887 #if defined(CONFIG_CMD_PING)
888 ping_receive(et, ip, len);
890 #ifdef CONFIG_CMD_TFTPPUT
891 if (packet_icmp_handler)
892 packet_icmp_handler(icmph->type, icmph->code,
893 ntohs(ip->udp_dst), src_ip, ntohs(ip->udp_src),
894 icmph->un.data, ntohs(ip->udp_len));
901 NetReceive(uchar *inpkt, int len)
903 struct ethernet_hdr *et;
904 struct ip_udp_hdr *ip;
908 #if defined(CONFIG_CMD_CDP)
911 ushort cti = 0, vlanid = VLAN_NONE, myvlanid, mynvlanid;
913 debug("packet received\n");
916 NetRxPacketLen = len;
917 et = (struct ethernet_hdr *)inpkt;
919 /* too small packet? */
920 if (len < ETHER_HDR_SIZE)
925 (*push_packet)(inpkt, len);
930 #if defined(CONFIG_CMD_CDP)
931 /* keep track if packet is CDP */
932 iscdp = is_cdp_packet(et->et_dest);
935 myvlanid = ntohs(NetOurVLAN);
936 if (myvlanid == (ushort)-1)
937 myvlanid = VLAN_NONE;
938 mynvlanid = ntohs(NetOurNativeVLAN);
939 if (mynvlanid == (ushort)-1)
940 mynvlanid = VLAN_NONE;
942 eth_proto = ntohs(et->et_protlen);
944 debug("packet received\n");
946 if (eth_proto < 1514) {
947 struct e802_hdr *et802 = (struct e802_hdr *)et;
949 * Got a 802.2 packet. Check the other protocol field.
950 * XXX VLAN over 802.2+SNAP not implemented!
952 eth_proto = ntohs(et802->et_prot);
954 ip = (struct ip_udp_hdr *)(inpkt + E802_HDR_SIZE);
955 len -= E802_HDR_SIZE;
957 } else if (eth_proto != PROT_VLAN) { /* normal packet */
958 ip = (struct ip_udp_hdr *)(inpkt + ETHER_HDR_SIZE);
959 len -= ETHER_HDR_SIZE;
961 } else { /* VLAN packet */
962 struct vlan_ethernet_hdr *vet =
963 (struct vlan_ethernet_hdr *)et;
965 debug("VLAN packet received\n");
967 /* too small packet? */
968 if (len < VLAN_ETHER_HDR_SIZE)
971 /* if no VLAN active */
972 if ((ntohs(NetOurVLAN) & VLAN_IDMASK) == VLAN_NONE
973 #if defined(CONFIG_CMD_CDP)
979 cti = ntohs(vet->vet_tag);
980 vlanid = cti & VLAN_IDMASK;
981 eth_proto = ntohs(vet->vet_type);
983 ip = (struct ip_udp_hdr *)(inpkt + VLAN_ETHER_HDR_SIZE);
984 len -= VLAN_ETHER_HDR_SIZE;
987 debug("Receive from protocol 0x%x\n", eth_proto);
989 #if defined(CONFIG_CMD_CDP)
991 cdp_receive((uchar *)ip, len);
996 if ((myvlanid & VLAN_IDMASK) != VLAN_NONE) {
997 if (vlanid == VLAN_NONE)
998 vlanid = (mynvlanid & VLAN_IDMASK);
1000 if (vlanid != (myvlanid & VLAN_IDMASK))
1004 switch (eth_proto) {
1007 ArpReceive(et, ip, len);
1010 #ifdef CONFIG_CMD_RARP
1012 rarp_receive(ip, len);
1017 /* Before we start poking the header, make sure it is there */
1018 if (len < IP_UDP_HDR_SIZE) {
1019 debug("len bad %d < %lu\n", len,
1020 (ulong)IP_UDP_HDR_SIZE);
1023 /* Check the packet length */
1024 if (len < ntohs(ip->ip_len)) {
1025 printf("len bad %d < %d\n", len, ntohs(ip->ip_len));
1028 len = ntohs(ip->ip_len);
1029 debug("len=%d, v=%02x\n", len, ip->ip_hl_v & 0xff);
1031 /* Can't deal with anything except IPv4 */
1032 if ((ip->ip_hl_v & 0xf0) != 0x40)
1034 /* Can't deal with IP options (headers != 20 bytes) */
1035 if ((ip->ip_hl_v & 0x0f) > 0x05)
1037 /* Check the Checksum of the header */
1038 if (!NetCksumOk((uchar *)ip, IP_HDR_SIZE / 2)) {
1039 puts("checksum bad\n");
1042 /* If it is not for us, ignore it */
1043 dst_ip = NetReadIP(&ip->ip_dst);
1044 if (NetOurIP && dst_ip != NetOurIP && dst_ip != 0xFFFFFFFF) {
1045 #ifdef CONFIG_MCAST_TFTP
1046 if (Mcast_addr != dst_ip)
1050 /* Read source IP address for later use */
1051 src_ip = NetReadIP(&ip->ip_src);
1053 * The function returns the unchanged packet if it's not
1054 * a fragment, and either the complete packet or NULL if
1055 * it is a fragment (if !CONFIG_IP_DEFRAG, it returns NULL)
1057 ip = NetDefragment(ip, &len);
1061 * watch for ICMP host redirects
1063 * There is no real handler code (yet). We just watch
1064 * for ICMP host redirect messages. In case anybody
1065 * sees these messages: please contact me
1066 * (wd@denx.de), or - even better - send me the
1067 * necessary fixes :-)
1069 * Note: in all cases where I have seen this so far
1070 * it was a problem with the router configuration,
1071 * for instance when a router was configured in the
1072 * BOOTP reply, but the TFTP server was on the same
1073 * subnet. So this is probably a warning that your
1074 * configuration might be wrong. But I'm not really
1075 * sure if there aren't any other situations.
1077 * Simon Glass <sjg@chromium.org>: We get an ICMP when
1078 * we send a tftp packet to a dead connection, or when
1079 * there is no server at the other end.
1081 if (ip->ip_p == IPPROTO_ICMP) {
1082 receive_icmp(ip, len, src_ip, et);
1084 } else if (ip->ip_p != IPPROTO_UDP) { /* Only UDP packets */
1088 #ifdef CONFIG_UDP_CHECKSUM
1089 if (ip->udp_xsum != 0) {
1095 xsum += (ntohs(ip->udp_len));
1096 xsum += (ntohl(ip->ip_src) >> 16) & 0x0000ffff;
1097 xsum += (ntohl(ip->ip_src) >> 0) & 0x0000ffff;
1098 xsum += (ntohl(ip->ip_dst) >> 16) & 0x0000ffff;
1099 xsum += (ntohl(ip->ip_dst) >> 0) & 0x0000ffff;
1101 sumlen = ntohs(ip->udp_len);
1102 sumptr = (ushort *) &(ip->udp_src);
1104 while (sumlen > 1) {
1107 sumdata = *sumptr++;
1108 xsum += ntohs(sumdata);
1114 sumdata = *(unsigned char *) sumptr;
1115 sumdata = (sumdata << 8) & 0xff00;
1118 while ((xsum >> 16) != 0) {
1119 xsum = (xsum & 0x0000ffff) +
1120 ((xsum >> 16) & 0x0000ffff);
1122 if ((xsum != 0x00000000) && (xsum != 0x0000ffff)) {
1123 printf(" UDP wrong checksum %08lx %08x\n",
1124 xsum, ntohs(ip->udp_xsum));
1131 #ifdef CONFIG_NETCONSOLE
1132 nc_input_packet((uchar *)ip + IP_UDP_HDR_SIZE,
1135 ntohs(ip->udp_len) - UDP_HDR_SIZE);
1138 * IP header OK. Pass the packet to the current handler.
1140 (*udp_packet_handler)((uchar *)ip + IP_UDP_HDR_SIZE,
1144 ntohs(ip->udp_len) - UDP_HDR_SIZE);
1150 /**********************************************************************/
1152 static int net_check_prereq(enum proto_t protocol)
1156 #if defined(CONFIG_CMD_PING)
1158 if (NetPingIP == 0) {
1159 puts("*** ERROR: ping address not given\n");
1164 #if defined(CONFIG_CMD_SNTP)
1166 if (NetNtpServerIP == 0) {
1167 puts("*** ERROR: NTP server address not given\n");
1172 #if defined(CONFIG_CMD_DNS)
1174 if (NetOurDNSIP == 0) {
1175 puts("*** ERROR: DNS server address not given\n");
1180 #if defined(CONFIG_CMD_NFS)
1185 if (NetServerIP == 0) {
1186 puts("*** ERROR: `serverip' not set\n");
1189 #if defined(CONFIG_CMD_PING) || defined(CONFIG_CMD_SNTP) || \
1190 defined(CONFIG_CMD_DNS)
1197 if (NetOurIP == 0) {
1198 puts("*** ERROR: `ipaddr' not set\n");
1203 #ifdef CONFIG_CMD_RARP
1210 if (memcmp(NetOurEther, "\0\0\0\0\0\0", 6) == 0) {
1211 int num = eth_get_dev_index();
1215 puts("*** ERROR: No ethernet found.\n");
1218 puts("*** ERROR: `ethaddr' not set\n");
1221 printf("*** ERROR: `eth%daddr' not set\n",
1235 /**********************************************************************/
1238 NetCksumOk(uchar *ptr, int len)
1240 return !((NetCksum(ptr, len) + 1) & 0xfffe);
1245 NetCksum(uchar *ptr, int len)
1248 ushort *p = (ushort *)ptr;
1253 xsum = (xsum & 0xffff) + (xsum >> 16);
1254 xsum = (xsum & 0xffff) + (xsum >> 16);
1255 return xsum & 0xffff;
1263 myvlanid = ntohs(NetOurVLAN);
1264 if (myvlanid == (ushort)-1)
1265 myvlanid = VLAN_NONE;
1267 return ((myvlanid & VLAN_IDMASK) == VLAN_NONE) ? ETHER_HDR_SIZE :
1268 VLAN_ETHER_HDR_SIZE;
1272 NetSetEther(uchar *xet, uchar * addr, uint prot)
1274 struct ethernet_hdr *et = (struct ethernet_hdr *)xet;
1277 myvlanid = ntohs(NetOurVLAN);
1278 if (myvlanid == (ushort)-1)
1279 myvlanid = VLAN_NONE;
1281 memcpy(et->et_dest, addr, 6);
1282 memcpy(et->et_src, NetOurEther, 6);
1283 if ((myvlanid & VLAN_IDMASK) == VLAN_NONE) {
1284 et->et_protlen = htons(prot);
1285 return ETHER_HDR_SIZE;
1287 struct vlan_ethernet_hdr *vet =
1288 (struct vlan_ethernet_hdr *)xet;
1290 vet->vet_vlan_type = htons(PROT_VLAN);
1291 vet->vet_tag = htons((0 << 5) | (myvlanid & VLAN_IDMASK));
1292 vet->vet_type = htons(prot);
1293 return VLAN_ETHER_HDR_SIZE;
1297 int net_update_ether(struct ethernet_hdr *et, uchar *addr, uint prot)
1301 memcpy(et->et_dest, addr, 6);
1302 memcpy(et->et_src, NetOurEther, 6);
1303 protlen = ntohs(et->et_protlen);
1304 if (protlen == PROT_VLAN) {
1305 struct vlan_ethernet_hdr *vet =
1306 (struct vlan_ethernet_hdr *)et;
1307 vet->vet_type = htons(prot);
1308 return VLAN_ETHER_HDR_SIZE;
1309 } else if (protlen > 1514) {
1310 et->et_protlen = htons(prot);
1311 return ETHER_HDR_SIZE;
1314 struct e802_hdr *et802 = (struct e802_hdr *)et;
1315 et802->et_prot = htons(prot);
1316 return E802_HDR_SIZE;
1320 void net_set_ip_header(uchar *pkt, IPaddr_t dest, IPaddr_t source)
1322 struct ip_udp_hdr *ip = (struct ip_udp_hdr *)pkt;
1325 * Construct an IP header.
1327 /* IP_HDR_SIZE / 4 (not including UDP) */
1330 ip->ip_len = htons(IP_HDR_SIZE);
1331 ip->ip_id = htons(NetIPID++);
1332 ip->ip_off = htons(IP_FLAGS_DFRAG); /* Don't fragment */
1335 /* already in network byte order */
1336 NetCopyIP((void *)&ip->ip_src, &source);
1337 /* already in network byte order */
1338 NetCopyIP((void *)&ip->ip_dst, &dest);
1341 void net_set_udp_header(uchar *pkt, IPaddr_t dest, int dport, int sport,
1344 struct ip_udp_hdr *ip = (struct ip_udp_hdr *)pkt;
1347 * If the data is an odd number of bytes, zero the
1348 * byte after the last byte so that the checksum
1352 pkt[IP_UDP_HDR_SIZE + len] = 0;
1354 net_set_ip_header(pkt, dest, NetOurIP);
1355 ip->ip_len = htons(IP_UDP_HDR_SIZE + len);
1356 ip->ip_p = IPPROTO_UDP;
1357 ip->ip_sum = ~NetCksum((uchar *)ip, IP_HDR_SIZE >> 1);
1359 ip->udp_src = htons(sport);
1360 ip->udp_dst = htons(dport);
1361 ip->udp_len = htons(UDP_HDR_SIZE + len);
1365 void copy_filename(char *dst, const char *src, int size)
1367 if (*src && (*src == '"')) {
1372 while ((--size > 0) && *src && (*src != '"'))
1377 #if defined(CONFIG_CMD_NFS) || \
1378 defined(CONFIG_CMD_SNTP) || \
1379 defined(CONFIG_CMD_DNS)
1381 * make port a little random (1024-17407)
1382 * This keeps the math somewhat trivial to compute, and seems to work with
1383 * all supported protocols/clients/servers
1385 unsigned int random_port(void)
1387 return 1024 + (get_timer(0) % 0x4000);
1391 void ip_to_string(IPaddr_t x, char *s)
1394 sprintf(s, "%d.%d.%d.%d",
1395 (int) ((x >> 24) & 0xff),
1396 (int) ((x >> 16) & 0xff),
1397 (int) ((x >> 8) & 0xff), (int) ((x >> 0) & 0xff)
1401 void VLAN_to_string(ushort x, char *s)
1405 if (x == (ushort)-1)
1411 sprintf(s, "%d", x & VLAN_IDMASK);
1414 ushort string_to_VLAN(const char *s)
1419 return htons(VLAN_NONE);
1421 if (*s < '0' || *s > '9')
1424 id = (ushort)simple_strtoul(s, NULL, 10);
1429 ushort getenv_VLAN(char *var)
1431 return string_to_VLAN(getenv(var));