/* * Copied from Linux Monitor (LiMon) - Networking. * * Copyright 1994 - 2000 Neil Russell. * (See License) * Copyright 2000 Roland Borde * Copyright 2000 Paolo Scaffardi * Copyright 2000-2002 Wolfgang Denk, wd@denx.de */ /* * General Desription: * * The user interface supports commands for BOOTP, RARP, and TFTP. * Also, we support ARP internally. Depending on available data, * these interact as follows: * * BOOTP: * * Prerequisites: - own ethernet address * We want: - own IP address * - TFTP server IP address * - name of bootfile * Next step: ARP * * RARP: * * Prerequisites: - own ethernet address * We want: - own IP address * - TFTP server IP address * Next step: ARP * * ARP: * * Prerequisites: - own ethernet address * - own IP address * - TFTP server IP address * We want: - TFTP server ethernet address * Next step: TFTP * * DHCP: * * Prerequisites: - own ethernet address * We want: - IP, Netmask, ServerIP, Gateway IP * - bootfilename, lease time * Next step: - TFTP * * TFTP: * * Prerequisites: - own ethernet address * - own IP address * - TFTP server IP address * - TFTP server ethernet address * - name of bootfile (if unknown, we use a default name * derived from our own IP address) * We want: - load the boot file * Next step: none * * NFS: * * Prerequisites: - own ethernet address * - own IP address * - name of bootfile (if unknown, we use a default name * derived from our own IP address) * We want: - load the boot file * Next step: none * * SNTP: * * Prerequisites: - own ethernet address * - own IP address * We want: - network time * Next step: none */ #include #include #include #if defined(CONFIG_STATUS_LED) #include #include #endif #include #include #include "arp.h" #include "bootp.h" #include "cdp.h" #if defined(CONFIG_CMD_DNS) #include "dns.h" #endif #include "nfs.h" #include "ping.h" #include "rarp.h" #if defined(CONFIG_CMD_SNTP) #include "sntp.h" #endif #include "tftp.h" DECLARE_GLOBAL_DATA_PTR; /** BOOTP EXTENTIONS **/ /* Our subnet mask (0=unknown) */ IPaddr_t NetOurSubnetMask; /* Our gateways IP address */ IPaddr_t NetOurGatewayIP; /* Our DNS IP address */ IPaddr_t NetOurDNSIP; #if defined(CONFIG_BOOTP_DNS2) /* Our 2nd DNS IP address */ IPaddr_t NetOurDNS2IP; #endif /* Our NIS domain */ char NetOurNISDomain[32] = {0,}; /* Our hostname */ char NetOurHostName[32] = {0,}; /* Our bootpath */ char NetOurRootPath[64] = {0,}; /* Our bootfile size in blocks */ ushort NetBootFileSize; #ifdef CONFIG_MCAST_TFTP /* Multicast TFTP */ IPaddr_t Mcast_addr; #endif /** END OF BOOTP EXTENTIONS **/ /* The actual transferred size of the bootfile (in bytes) */ ulong NetBootFileXferSize; /* Our ethernet address */ uchar NetOurEther[6]; /* Boot server enet address */ uchar NetServerEther[6]; /* Our IP addr (0 = unknown) */ IPaddr_t NetOurIP; /* Server IP addr (0 = unknown) */ IPaddr_t NetServerIP; /* Current receive packet */ uchar *NetRxPacket; /* Current rx packet length */ int NetRxPacketLen; /* IP packet ID */ unsigned NetIPID; /* Ethernet bcast address */ uchar NetBcastAddr[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; uchar NetEtherNullAddr[6]; #ifdef CONFIG_API void (*push_packet)(void *, int len) = 0; #endif /* Network loop state */ enum net_loop_state net_state; /* Tried all network devices */ int NetRestartWrap; /* Network loop restarted */ static int NetRestarted; /* At least one device configured */ static int NetDevExists; /* XXX in both little & big endian machines 0xFFFF == ntohs(-1) */ /* default is without VLAN */ ushort NetOurVLAN = 0xFFFF; /* ditto */ ushort NetOurNativeVLAN = 0xFFFF; /* Boot File name */ char BootFile[128]; #if defined(CONFIG_CMD_SNTP) /* NTP server IP address */ IPaddr_t NetNtpServerIP; /* offset time from UTC */ int NetTimeOffset; #endif uchar PktBuf[(PKTBUFSRX+1) * PKTSIZE_ALIGN + PKTALIGN]; /* Receive packet */ uchar *NetRxPackets[PKTBUFSRX]; /* Current UDP RX packet handler */ static rxhand_f *udp_packet_handler; /* Current ARP RX packet handler */ static rxhand_f *arp_packet_handler; #ifdef CONFIG_CMD_TFTPPUT /* Current ICMP rx handler */ static rxhand_icmp_f *packet_icmp_handler; #endif /* Current timeout handler */ static thand_f *timeHandler; /* Time base value */ static ulong timeStart; /* Current timeout value */ static ulong timeDelta; /* THE transmit packet */ uchar *NetTxPacket; static int net_check_prereq(enum proto_t protocol); static int NetTryCount; /**********************************************************************/ /* * Check if autoload is enabled. If so, use either NFS or TFTP to download * the boot file. */ void net_auto_load(void) { const char *s = getenv("autoload"); if (s != NULL) { if (*s == 'n') { /* * Just use BOOTP/RARP to configure system; * Do not use TFTP to load the bootfile. */ net_set_state(NETLOOP_SUCCESS); return; } #if defined(CONFIG_CMD_NFS) if (strcmp(s, "NFS") == 0) { /* * Use NFS to load the bootfile. */ NfsStart(); return; } #endif } TftpStart(TFTPGET); } static void NetInitLoop(enum proto_t protocol) { static int env_changed_id; int env_id = get_env_id(); /* update only when the environment has changed */ if (env_changed_id != env_id) { NetOurIP = getenv_IPaddr("ipaddr"); NetOurGatewayIP = getenv_IPaddr("gatewayip"); NetOurSubnetMask = getenv_IPaddr("netmask"); NetServerIP = getenv_IPaddr("serverip"); NetOurNativeVLAN = getenv_VLAN("nvlan"); NetOurVLAN = getenv_VLAN("vlan"); #if defined(CONFIG_CMD_DNS) NetOurDNSIP = getenv_IPaddr("dnsip"); #endif env_changed_id = env_id; } return; } static void net_clear_handlers(void) { net_set_udp_handler(NULL); net_set_arp_handler(NULL); NetSetTimeout(0, NULL); } static void net_cleanup_loop(void) { net_clear_handlers(); } /**********************************************************************/ /* * Main network processing loop. */ int NetLoop(enum proto_t protocol) { int i; bd_t *bd = gd->bd; int ret = -1; NetRestarted = 0; NetDevExists = 0; NetTxPacket = NULL; NetTryCount = 1; ArpInit(); net_clear_handlers(); /* * Setup packet buffers, aligned correctly. */ NetTxPacket = &PktBuf[0] + (PKTALIGN - 1); NetTxPacket -= (ulong)NetTxPacket % PKTALIGN; for (i = 0; i < PKTBUFSRX; i++) NetRxPackets[i] = NetTxPacket + (i+1)*PKTSIZE_ALIGN; bootstage_mark_name(BOOTSTAGE_ID_ETH_START, "eth_start"); eth_halt(); eth_set_current(); if (eth_init(bd) < 0) { eth_halt(); return -1; } restart: memcpy(NetOurEther, eth_get_dev()->enetaddr, 6); net_set_state(NETLOOP_CONTINUE); /* * Start the ball rolling with the given start function. From * here on, this code is a state machine driven by received * packets and timer events. */ NetInitLoop(protocol); switch (net_check_prereq(protocol)) { case 1: /* network not configured */ eth_halt(); return -1; case 2: /* network device not configured */ break; case 0: NetDevExists = 1; NetBootFileXferSize = 0; switch (protocol) { case TFTPGET: #ifdef CONFIG_CMD_TFTPPUT case TFTPPUT: #endif /* always use ARP to get server ethernet address */ TftpStart(protocol); break; #ifdef CONFIG_CMD_TFTPSRV case TFTPSRV: TftpStartServer(); break; #endif #if defined(CONFIG_CMD_DHCP) case DHCP: BootpTry = 0; NetOurIP = 0; DhcpRequest(); /* Basically same as BOOTP */ break; #endif case BOOTP: BootpTry = 0; NetOurIP = 0; BootpRequest(); break; #if defined(CONFIG_CMD_RARP) case RARP: RarpTry = 0; NetOurIP = 0; RarpRequest(); break; #endif #if defined(CONFIG_CMD_PING) case PING: ping_start(); break; #endif #if defined(CONFIG_CMD_NFS) case NFS: NfsStart(); break; #endif #if defined(CONFIG_CMD_CDP) case CDP: CDPStart(); break; #endif #ifdef CONFIG_NETCONSOLE case NETCONS: NcStart(); break; #endif #if defined(CONFIG_CMD_SNTP) case SNTP: SntpStart(); break; #endif #if defined(CONFIG_CMD_DNS) case DNS: DnsStart(); break; #endif default: break; } break; } #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII) #if defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN) && \ defined(CONFIG_STATUS_LED) && \ defined(STATUS_LED_RED) /* * Echo the inverted link state to the fault LED. */ if (miiphy_link(eth_get_dev()->name, CONFIG_SYS_FAULT_MII_ADDR)) status_led_set(STATUS_LED_RED, STATUS_LED_OFF); else status_led_set(STATUS_LED_RED, STATUS_LED_ON); #endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */ #endif /* CONFIG_MII, ... */ /* * Main packet reception loop. Loop receiving packets until * someone sets `net_state' to a state that terminates. */ for (;;) { WATCHDOG_RESET(); #ifdef CONFIG_SHOW_ACTIVITY show_activity(1); #endif /* * Check the ethernet for a new packet. The ethernet * receive routine will process it. */ eth_rx(); /* * Abort if ctrl-c was pressed. */ if (ctrlc()) { net_cleanup_loop(); eth_halt(); puts("\nAbort\n"); goto done; } ArpTimeoutCheck(); /* * Check for a timeout, and run the timeout handler * if we have one. */ if (timeHandler && ((get_timer(0) - timeStart) > timeDelta)) { thand_f *x; #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII) #if defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN) && \ defined(CONFIG_STATUS_LED) && \ defined(STATUS_LED_RED) /* * Echo the inverted link state to the fault LED. */ if (miiphy_link(eth_get_dev()->name, CONFIG_SYS_FAULT_MII_ADDR)) { status_led_set(STATUS_LED_RED, STATUS_LED_OFF); } else { status_led_set(STATUS_LED_RED, STATUS_LED_ON); } #endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */ #endif /* CONFIG_MII, ... */ x = timeHandler; timeHandler = (thand_f *)0; (*x)(); } switch (net_state) { case NETLOOP_RESTART: NetRestarted = 1; goto restart; case NETLOOP_SUCCESS: net_cleanup_loop(); if (NetBootFileXferSize > 0) { char buf[20]; printf("Bytes transferred = %ld (%lx hex)\n", NetBootFileXferSize, NetBootFileXferSize); sprintf(buf, "%lX", NetBootFileXferSize); setenv("filesize", buf); sprintf(buf, "%lX", (unsigned long)load_addr); setenv("fileaddr", buf); } eth_halt(); ret = NetBootFileXferSize; goto done; case NETLOOP_FAIL: net_cleanup_loop(); goto done; case NETLOOP_CONTINUE: continue; } } done: #ifdef CONFIG_CMD_TFTPPUT /* Clear out the handlers */ net_set_udp_handler(NULL); net_set_icmp_handler(NULL); #endif return ret; } /**********************************************************************/ static void startAgainTimeout(void) { net_set_state(NETLOOP_RESTART); } void NetStartAgain(void) { char *nretry; int retry_forever = 0; unsigned long retrycnt = 0; nretry = getenv("netretry"); if (nretry) { if (!strcmp(nretry, "yes")) retry_forever = 1; else if (!strcmp(nretry, "no")) retrycnt = 0; else if (!strcmp(nretry, "once")) retrycnt = 1; else retrycnt = simple_strtoul(nretry, NULL, 0); } else retry_forever = 1; if ((!retry_forever) && (NetTryCount >= retrycnt)) { eth_halt(); net_set_state(NETLOOP_FAIL); return; } NetTryCount++; eth_halt(); #if !defined(CONFIG_NET_DO_NOT_TRY_ANOTHER) eth_try_another(!NetRestarted); #endif eth_init(gd->bd); if (NetRestartWrap) { NetRestartWrap = 0; if (NetDevExists) { NetSetTimeout(10000UL, startAgainTimeout); net_set_udp_handler(NULL); } else { net_set_state(NETLOOP_FAIL); } } else { net_set_state(NETLOOP_RESTART); } } /**********************************************************************/ /* * Miscelaneous bits. */ static void dummy_handler(uchar *pkt, unsigned dport, IPaddr_t sip, unsigned sport, unsigned len) { } rxhand_f *net_get_udp_handler(void) { return udp_packet_handler; } void net_set_udp_handler(rxhand_f *f) { if (f == NULL) udp_packet_handler = dummy_handler; else udp_packet_handler = f; } rxhand_f *net_get_arp_handler(void) { return arp_packet_handler; } void net_set_arp_handler(rxhand_f *f) { if (f == NULL) arp_packet_handler = dummy_handler; else arp_packet_handler = f; } #ifdef CONFIG_CMD_TFTPPUT void net_set_icmp_handler(rxhand_icmp_f *f) { packet_icmp_handler = f; } #endif void NetSetTimeout(ulong iv, thand_f *f) { if (iv == 0) { timeHandler = (thand_f *)0; } else { timeHandler = f; timeStart = get_timer(0); timeDelta = iv; } } int NetSendUDPPacket(uchar *ether, IPaddr_t dest, int dport, int sport, int payload_len) { uchar *pkt; int need_arp = 0; int eth_hdr_size; int pkt_hdr_size; /* convert to new style broadcast */ if (dest == 0) dest = 0xFFFFFFFF; /* if broadcast, make the ether address a broadcast and don't do ARP */ if (dest == 0xFFFFFFFF) ether = NetBcastAddr; /* * if MAC address was not discovered yet, save the packet and do * an ARP request */ if (memcmp(ether, NetEtherNullAddr, 6) == 0) { need_arp = 1; pkt = NetArpWaitTxPacket; } else pkt = (uchar *)NetTxPacket; eth_hdr_size = NetSetEther(pkt, ether, PROT_IP); pkt += eth_hdr_size; net_set_udp_header(pkt, dest, dport, sport, payload_len); pkt_hdr_size = eth_hdr_size + IP_UDP_HDR_SIZE; if (need_arp) { debug("sending ARP for %pI4\n", &dest); /* save the ip and eth addr for the packet to send after arp */ NetArpWaitPacketIP = dest; NetArpWaitPacketMAC = ether; /* * Copy the packet data from the NetTxPacket into the * NetArpWaitTxPacket to send after arp */ memcpy(pkt + IP_UDP_HDR_SIZE, (uchar *)NetTxPacket + pkt_hdr_size, payload_len); /* size of the waiting packet */ NetArpWaitTxPacketSize = pkt_hdr_size + payload_len; /* and do the ARP request */ NetArpWaitTry = 1; NetArpWaitTimerStart = get_timer(0); ArpRequest(); return 1; /* waiting */ } else { debug("sending UDP to %pI4/%pM\n", &dest, ether); NetSendPacket(NetTxPacket, pkt_hdr_size + payload_len); return 0; /* transmitted */ } } #ifdef CONFIG_IP_DEFRAG /* * This function collects fragments in a single packet, according * to the algorithm in RFC815. It returns NULL or the pointer to * a complete packet, in static storage */ #ifndef CONFIG_NET_MAXDEFRAG #define CONFIG_NET_MAXDEFRAG 16384 #endif /* * MAXDEFRAG, above, is chosen in the config file and is real data * so we need to add the NFS overhead, which is more than TFTP. * To use sizeof in the internal unnamed structures, we need a real * instance (can't do "sizeof(struct rpc_t.u.reply))", unfortunately). * The compiler doesn't complain nor allocates the actual structure */ static struct rpc_t rpc_specimen; #define IP_PKTSIZE (CONFIG_NET_MAXDEFRAG + sizeof(rpc_specimen.u.reply)) #define IP_MAXUDP (IP_PKTSIZE - IP_HDR_SIZE) /* * this is the packet being assembled, either data or frag control. * Fragments go by 8 bytes, so this union must be 8 bytes long */ struct hole { /* first_byte is address of this structure */ u16 last_byte; /* last byte in this hole + 1 (begin of next hole) */ u16 next_hole; /* index of next (in 8-b blocks), 0 == none */ u16 prev_hole; /* index of prev, 0 == none */ u16 unused; }; static struct ip_udp_hdr *__NetDefragment(struct ip_udp_hdr *ip, int *lenp) { static uchar pkt_buff[IP_PKTSIZE] __aligned(PKTALIGN); static u16 first_hole, total_len; struct hole *payload, *thisfrag, *h, *newh; struct ip_udp_hdr *localip = (struct ip_udp_hdr *)pkt_buff; uchar *indata = (uchar *)ip; int offset8, start, len, done = 0; u16 ip_off = ntohs(ip->ip_off); /* payload starts after IP header, this fragment is in there */ payload = (struct hole *)(pkt_buff + IP_HDR_SIZE); offset8 = (ip_off & IP_OFFS); thisfrag = payload + offset8; start = offset8 * 8; len = ntohs(ip->ip_len) - IP_HDR_SIZE; if (start + len > IP_MAXUDP) /* fragment extends too far */ return NULL; if (!total_len || localip->ip_id != ip->ip_id) { /* new (or different) packet, reset structs */ total_len = 0xffff; payload[0].last_byte = ~0; payload[0].next_hole = 0; payload[0].prev_hole = 0; first_hole = 0; /* any IP header will work, copy the first we received */ memcpy(localip, ip, IP_HDR_SIZE); } /* * What follows is the reassembly algorithm. We use the payload * array as a linked list of hole descriptors, as each hole starts * at a multiple of 8 bytes. However, last byte can be whatever value, * so it is represented as byte count, not as 8-byte blocks. */ h = payload + first_hole; while (h->last_byte < start) { if (!h->next_hole) { /* no hole that far away */ return NULL; } h = payload + h->next_hole; } /* last fragment may be 1..7 bytes, the "+7" forces acceptance */ if (offset8 + ((len + 7) / 8) <= h - payload) { /* no overlap with holes (dup fragment?) */ return NULL; } if (!(ip_off & IP_FLAGS_MFRAG)) { /* no more fragmentss: truncate this (last) hole */ total_len = start + len; h->last_byte = start + len; } /* * There is some overlap: fix the hole list. This code doesn't * deal with a fragment that overlaps with two different holes * (thus being a superset of a previously-received fragment). */ if ((h >= thisfrag) && (h->last_byte <= start + len)) { /* complete overlap with hole: remove hole */ if (!h->prev_hole && !h->next_hole) { /* last remaining hole */ done = 1; } else if (!h->prev_hole) { /* first hole */ first_hole = h->next_hole; payload[h->next_hole].prev_hole = 0; } else if (!h->next_hole) { /* last hole */ payload[h->prev_hole].next_hole = 0; } else { /* in the middle of the list */ payload[h->next_hole].prev_hole = h->prev_hole; payload[h->prev_hole].next_hole = h->next_hole; } } else if (h->last_byte <= start + len) { /* overlaps with final part of the hole: shorten this hole */ h->last_byte = start; } else if (h >= thisfrag) { /* overlaps with initial part of the hole: move this hole */ newh = thisfrag + (len / 8); *newh = *h; h = newh; if (h->next_hole) payload[h->next_hole].prev_hole = (h - payload); if (h->prev_hole) payload[h->prev_hole].next_hole = (h - payload); else first_hole = (h - payload); } else { /* fragment sits in the middle: split the hole */ newh = thisfrag + (len / 8); *newh = *h; h->last_byte = start; h->next_hole = (newh - payload); newh->prev_hole = (h - payload); if (newh->next_hole) payload[newh->next_hole].prev_hole = (newh - payload); } /* finally copy this fragment and possibly return whole packet */ memcpy((uchar *)thisfrag, indata + IP_HDR_SIZE, len); if (!done) return NULL; localip->ip_len = htons(total_len); *lenp = total_len + IP_HDR_SIZE; return localip; } static inline struct ip_udp_hdr *NetDefragment(struct ip_udp_hdr *ip, int *lenp) { u16 ip_off = ntohs(ip->ip_off); if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG))) return ip; /* not a fragment */ return __NetDefragment(ip, lenp); } #else /* !CONFIG_IP_DEFRAG */ static inline struct ip_udp_hdr *NetDefragment(struct ip_udp_hdr *ip, int *lenp) { u16 ip_off = ntohs(ip->ip_off); if (!(ip_off & (IP_OFFS | IP_FLAGS_MFRAG))) return ip; /* not a fragment */ return NULL; } #endif /** * Receive an ICMP packet. We deal with REDIRECT and PING here, and silently * drop others. * * @parma ip IP packet containing the ICMP */ static void receive_icmp(struct ip_udp_hdr *ip, int len, IPaddr_t src_ip, struct ethernet_hdr *et) { struct icmp_hdr *icmph = (struct icmp_hdr *)&ip->udp_src; switch (icmph->type) { case ICMP_REDIRECT: if (icmph->code != ICMP_REDIR_HOST) return; printf(" ICMP Host Redirect to %pI4 ", &icmph->un.gateway); break; default: #if defined(CONFIG_CMD_PING) ping_receive(et, ip, len); #endif #ifdef CONFIG_CMD_TFTPPUT if (packet_icmp_handler) packet_icmp_handler(icmph->type, icmph->code, ntohs(ip->udp_dst), src_ip, ntohs(ip->udp_src), icmph->un.data, ntohs(ip->udp_len)); #endif break; } } void NetReceive(uchar *inpkt, int len) { struct ethernet_hdr *et; struct ip_udp_hdr *ip; IPaddr_t dst_ip; IPaddr_t src_ip; int eth_proto; #if defined(CONFIG_CMD_CDP) int iscdp; #endif ushort cti = 0, vlanid = VLAN_NONE, myvlanid, mynvlanid; debug("packet received\n"); NetRxPacket = inpkt; NetRxPacketLen = len; et = (struct ethernet_hdr *)inpkt; /* too small packet? */ if (len < ETHER_HDR_SIZE) return; #ifdef CONFIG_API if (push_packet) { (*push_packet)(inpkt, len); return; } #endif #if defined(CONFIG_CMD_CDP) /* keep track if packet is CDP */ iscdp = is_cdp_packet(et->et_dest); #endif myvlanid = ntohs(NetOurVLAN); if (myvlanid == (ushort)-1) myvlanid = VLAN_NONE; mynvlanid = ntohs(NetOurNativeVLAN); if (mynvlanid == (ushort)-1) mynvlanid = VLAN_NONE; eth_proto = ntohs(et->et_protlen); debug("packet received\n"); if (eth_proto < 1514) { struct e802_hdr *et802 = (struct e802_hdr *)et; /* * Got a 802.2 packet. Check the other protocol field. * XXX VLAN over 802.2+SNAP not implemented! */ eth_proto = ntohs(et802->et_prot); ip = (struct ip_udp_hdr *)(inpkt + E802_HDR_SIZE); len -= E802_HDR_SIZE; } else if (eth_proto != PROT_VLAN) { /* normal packet */ ip = (struct ip_udp_hdr *)(inpkt + ETHER_HDR_SIZE); len -= ETHER_HDR_SIZE; } else { /* VLAN packet */ struct vlan_ethernet_hdr *vet = (struct vlan_ethernet_hdr *)et; debug("VLAN packet received\n"); /* too small packet? */ if (len < VLAN_ETHER_HDR_SIZE) return; /* if no VLAN active */ if ((ntohs(NetOurVLAN) & VLAN_IDMASK) == VLAN_NONE #if defined(CONFIG_CMD_CDP) && iscdp == 0 #endif ) return; cti = ntohs(vet->vet_tag); vlanid = cti & VLAN_IDMASK; eth_proto = ntohs(vet->vet_type); ip = (struct ip_udp_hdr *)(inpkt + VLAN_ETHER_HDR_SIZE); len -= VLAN_ETHER_HDR_SIZE; } debug("Receive from protocol 0x%x\n", eth_proto); #if defined(CONFIG_CMD_CDP) if (iscdp) { cdp_receive((uchar *)ip, len); return; } #endif if ((myvlanid & VLAN_IDMASK) != VLAN_NONE) { if (vlanid == VLAN_NONE) vlanid = (mynvlanid & VLAN_IDMASK); /* not matched? */ if (vlanid != (myvlanid & VLAN_IDMASK)) return; } switch (eth_proto) { case PROT_ARP: ArpReceive(et, ip, len); break; #ifdef CONFIG_CMD_RARP case PROT_RARP: rarp_receive(ip, len); break; #endif case PROT_IP: debug("Got IP\n"); /* Before we start poking the header, make sure it is there */ if (len < IP_UDP_HDR_SIZE) { debug("len bad %d < %lu\n", len, (ulong)IP_UDP_HDR_SIZE); return; } /* Check the packet length */ if (len < ntohs(ip->ip_len)) { printf("len bad %d < %d\n", len, ntohs(ip->ip_len)); return; } len = ntohs(ip->ip_len); debug("len=%d, v=%02x\n", len, ip->ip_hl_v & 0xff); /* Can't deal with anything except IPv4 */ if ((ip->ip_hl_v & 0xf0) != 0x40) return; /* Can't deal with IP options (headers != 20 bytes) */ if ((ip->ip_hl_v & 0x0f) > 0x05) return; /* Check the Checksum of the header */ if (!NetCksumOk((uchar *)ip, IP_HDR_SIZE / 2)) { puts("checksum bad\n"); return; } /* If it is not for us, ignore it */ dst_ip = NetReadIP(&ip->ip_dst); if (NetOurIP && dst_ip != NetOurIP && dst_ip != 0xFFFFFFFF) { #ifdef CONFIG_MCAST_TFTP if (Mcast_addr != dst_ip) #endif return; } /* Read source IP address for later use */ src_ip = NetReadIP(&ip->ip_src); /* * The function returns the unchanged packet if it's not * a fragment, and either the complete packet or NULL if * it is a fragment (if !CONFIG_IP_DEFRAG, it returns NULL) */ ip = NetDefragment(ip, &len); if (!ip) return; /* * watch for ICMP host redirects * * There is no real handler code (yet). We just watch * for ICMP host redirect messages. In case anybody * sees these messages: please contact me * (wd@denx.de), or - even better - send me the * necessary fixes :-) * * Note: in all cases where I have seen this so far * it was a problem with the router configuration, * for instance when a router was configured in the * BOOTP reply, but the TFTP server was on the same * subnet. So this is probably a warning that your * configuration might be wrong. But I'm not really * sure if there aren't any other situations. * * Simon Glass : We get an ICMP when * we send a tftp packet to a dead connection, or when * there is no server at the other end. */ if (ip->ip_p == IPPROTO_ICMP) { receive_icmp(ip, len, src_ip, et); return; } else if (ip->ip_p != IPPROTO_UDP) { /* Only UDP packets */ return; } #ifdef CONFIG_UDP_CHECKSUM if (ip->udp_xsum != 0) { ulong xsum; ushort *sumptr; ushort sumlen; xsum = ip->ip_p; xsum += (ntohs(ip->udp_len)); xsum += (ntohl(ip->ip_src) >> 16) & 0x0000ffff; xsum += (ntohl(ip->ip_src) >> 0) & 0x0000ffff; xsum += (ntohl(ip->ip_dst) >> 16) & 0x0000ffff; xsum += (ntohl(ip->ip_dst) >> 0) & 0x0000ffff; sumlen = ntohs(ip->udp_len); sumptr = (ushort *) &(ip->udp_src); while (sumlen > 1) { ushort sumdata; sumdata = *sumptr++; xsum += ntohs(sumdata); sumlen -= 2; } if (sumlen > 0) { ushort sumdata; sumdata = *(unsigned char *) sumptr; sumdata = (sumdata << 8) & 0xff00; xsum += sumdata; } while ((xsum >> 16) != 0) { xsum = (xsum & 0x0000ffff) + ((xsum >> 16) & 0x0000ffff); } if ((xsum != 0x00000000) && (xsum != 0x0000ffff)) { printf(" UDP wrong checksum %08lx %08x\n", xsum, ntohs(ip->udp_xsum)); return; } } #endif #ifdef CONFIG_NETCONSOLE nc_input_packet((uchar *)ip + IP_UDP_HDR_SIZE, ntohs(ip->udp_dst), ntohs(ip->udp_src), ntohs(ip->udp_len) - UDP_HDR_SIZE); #endif /* * IP header OK. Pass the packet to the current handler. */ (*udp_packet_handler)((uchar *)ip + IP_UDP_HDR_SIZE, ntohs(ip->udp_dst), src_ip, ntohs(ip->udp_src), ntohs(ip->udp_len) - UDP_HDR_SIZE); break; } } /**********************************************************************/ static int net_check_prereq(enum proto_t protocol) { switch (protocol) { /* Fall through */ #if defined(CONFIG_CMD_PING) case PING: if (NetPingIP == 0) { puts("*** ERROR: ping address not given\n"); return 1; } goto common; #endif #if defined(CONFIG_CMD_SNTP) case SNTP: if (NetNtpServerIP == 0) { puts("*** ERROR: NTP server address not given\n"); return 1; } goto common; #endif #if defined(CONFIG_CMD_DNS) case DNS: if (NetOurDNSIP == 0) { puts("*** ERROR: DNS server address not given\n"); return 1; } goto common; #endif #if defined(CONFIG_CMD_NFS) case NFS: #endif case TFTPGET: case TFTPPUT: if (NetServerIP == 0) { puts("*** ERROR: `serverip' not set\n"); return 1; } #if defined(CONFIG_CMD_PING) || defined(CONFIG_CMD_SNTP) || \ defined(CONFIG_CMD_DNS) common: #endif /* Fall through */ case NETCONS: case TFTPSRV: if (NetOurIP == 0) { puts("*** ERROR: `ipaddr' not set\n"); return 1; } /* Fall through */ #ifdef CONFIG_CMD_RARP case RARP: #endif case BOOTP: case CDP: case DHCP: if (memcmp(NetOurEther, "\0\0\0\0\0\0", 6) == 0) { int num = eth_get_dev_index(); switch (num) { case -1: puts("*** ERROR: No ethernet found.\n"); return 1; case 0: puts("*** ERROR: `ethaddr' not set\n"); break; default: printf("*** ERROR: `eth%daddr' not set\n", num); break; } NetStartAgain(); return 2; } /* Fall through */ default: return 0; } return 0; /* OK */ } /**********************************************************************/ int NetCksumOk(uchar *ptr, int len) { return !((NetCksum(ptr, len) + 1) & 0xfffe); } unsigned NetCksum(uchar *ptr, int len) { ulong xsum; ushort *p = (ushort *)ptr; xsum = 0; while (len-- > 0) xsum += *p++; xsum = (xsum & 0xffff) + (xsum >> 16); xsum = (xsum & 0xffff) + (xsum >> 16); return xsum & 0xffff; } int NetEthHdrSize(void) { ushort myvlanid; myvlanid = ntohs(NetOurVLAN); if (myvlanid == (ushort)-1) myvlanid = VLAN_NONE; return ((myvlanid & VLAN_IDMASK) == VLAN_NONE) ? ETHER_HDR_SIZE : VLAN_ETHER_HDR_SIZE; } int NetSetEther(uchar *xet, uchar * addr, uint prot) { struct ethernet_hdr *et = (struct ethernet_hdr *)xet; ushort myvlanid; myvlanid = ntohs(NetOurVLAN); if (myvlanid == (ushort)-1) myvlanid = VLAN_NONE; memcpy(et->et_dest, addr, 6); memcpy(et->et_src, NetOurEther, 6); if ((myvlanid & VLAN_IDMASK) == VLAN_NONE) { et->et_protlen = htons(prot); return ETHER_HDR_SIZE; } else { struct vlan_ethernet_hdr *vet = (struct vlan_ethernet_hdr *)xet; vet->vet_vlan_type = htons(PROT_VLAN); vet->vet_tag = htons((0 << 5) | (myvlanid & VLAN_IDMASK)); vet->vet_type = htons(prot); return VLAN_ETHER_HDR_SIZE; } } void net_set_ip_header(uchar *pkt, IPaddr_t dest, IPaddr_t source) { struct ip_udp_hdr *ip = (struct ip_udp_hdr *)pkt; /* * Construct an IP header. */ /* IP_HDR_SIZE / 4 (not including UDP) */ ip->ip_hl_v = 0x45; ip->ip_tos = 0; ip->ip_len = htons(IP_HDR_SIZE); ip->ip_id = htons(NetIPID++); ip->ip_off = htons(IP_FLAGS_DFRAG); /* Don't fragment */ ip->ip_ttl = 255; ip->ip_sum = 0; /* already in network byte order */ NetCopyIP((void *)&ip->ip_src, &source); /* already in network byte order */ NetCopyIP((void *)&ip->ip_dst, &dest); } void net_set_udp_header(uchar *pkt, IPaddr_t dest, int dport, int sport, int len) { struct ip_udp_hdr *ip = (struct ip_udp_hdr *)pkt; /* * If the data is an odd number of bytes, zero the * byte after the last byte so that the checksum * will work. */ if (len & 1) pkt[IP_UDP_HDR_SIZE + len] = 0; net_set_ip_header(pkt, dest, NetOurIP); ip->ip_len = htons(IP_UDP_HDR_SIZE + len); ip->ip_p = IPPROTO_UDP; ip->ip_sum = ~NetCksum((uchar *)ip, IP_HDR_SIZE >> 1); ip->udp_src = htons(sport); ip->udp_dst = htons(dport); ip->udp_len = htons(UDP_HDR_SIZE + len); ip->udp_xsum = 0; } void copy_filename(char *dst, const char *src, int size) { if (*src && (*src == '"')) { ++src; --size; } while ((--size > 0) && *src && (*src != '"')) *dst++ = *src++; *dst = '\0'; } #if defined(CONFIG_CMD_NFS) || \ defined(CONFIG_CMD_SNTP) || \ defined(CONFIG_CMD_DNS) /* * make port a little random (1024-17407) * This keeps the math somewhat trivial to compute, and seems to work with * all supported protocols/clients/servers */ unsigned int random_port(void) { return 1024 + (get_timer(0) % 0x4000); } #endif void ip_to_string(IPaddr_t x, char *s) { x = ntohl(x); sprintf(s, "%d.%d.%d.%d", (int) ((x >> 24) & 0xff), (int) ((x >> 16) & 0xff), (int) ((x >> 8) & 0xff), (int) ((x >> 0) & 0xff) ); } void VLAN_to_string(ushort x, char *s) { x = ntohs(x); if (x == (ushort)-1) x = VLAN_NONE; if (x == VLAN_NONE) strcpy(s, "none"); else sprintf(s, "%d", x & VLAN_IDMASK); } ushort string_to_VLAN(const char *s) { ushort id; if (s == NULL) return htons(VLAN_NONE); if (*s < '0' || *s > '9') id = VLAN_NONE; else id = (ushort)simple_strtoul(s, NULL, 10); return htons(id); } ushort getenv_VLAN(char *var) { return string_to_VLAN(getenv(var)); }