diff options
Diffstat (limited to 'qemu/roms/u-boot/net/net.c')
| -rw-r--r-- | qemu/roms/u-boot/net/net.c | 1487 |
1 files changed, 1487 insertions, 0 deletions
diff --git a/qemu/roms/u-boot/net/net.c b/qemu/roms/u-boot/net/net.c new file mode 100644 index 000000000..f7cc29f03 --- /dev/null +++ b/qemu/roms/u-boot/net/net.c @@ -0,0 +1,1487 @@ +/* + * 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 + * + * LINK_LOCAL: + * + * Prerequisites: - own ethernet address + * We want: - own IP address + * 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 <common.h> +#include <command.h> +#include <environment.h> +#include <net.h> +#if defined(CONFIG_STATUS_LED) +#include <miiphy.h> +#include <status_led.h> +#endif +#include <watchdog.h> +#include <linux/compiler.h> +#include "arp.h" +#include "bootp.h" +#include "cdp.h" +#if defined(CONFIG_CMD_DNS) +#include "dns.h" +#endif +#include "link_local.h" +#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 + +static 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; + +int __maybe_unused net_busy_flag; + +/**********************************************************************/ + +static int on_bootfile(const char *name, const char *value, enum env_op op, + int flags) +{ + switch (op) { + case env_op_create: + case env_op_overwrite: + copy_filename(BootFile, value, sizeof(BootFile)); + break; + default: + break; + } + + return 0; +} +U_BOOT_ENV_CALLBACK(bootfile, on_bootfile); + +/* + * Check if autoload is enabled. If so, use either NFS or TFTP to download + * the boot file. + */ +void net_auto_load(void) +{ +#if defined(CONFIG_CMD_NFS) + const char *s = getenv("autoload"); + + if (s != NULL && strcmp(s, "NFS") == 0) { + /* + * Use NFS to load the bootfile. + */ + NfsStart(); + return; + } +#endif + if (getenv_yesno("autoload") == 0) { + /* + * Just use BOOTP/RARP to configure system; + * Do not use TFTP to load the bootfile. + */ + net_set_state(NETLOOP_SUCCESS); + return; + } + TftpStart(TFTPGET); +} + +static void NetInitLoop(void) +{ + 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; + } + if (eth_get_dev()) + memcpy(NetOurEther, eth_get_dev()->enetaddr, 6); + + 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(); +} + +void net_init(void) +{ + static int first_call = 1; + + if (first_call) { + /* + * Setup packet buffers, aligned correctly. + */ + int i; + + NetTxPacket = &PktBuf[0] + (PKTALIGN - 1); + NetTxPacket -= (ulong)NetTxPacket % PKTALIGN; + for (i = 0; i < PKTBUFSRX; i++) + NetRxPackets[i] = NetTxPacket + (i + 1) * PKTSIZE_ALIGN; + + ArpInit(); + net_clear_handlers(); + + /* Only need to setup buffer pointers once. */ + first_call = 0; + } + + NetInitLoop(); +} + +/**********************************************************************/ +/* + * Main network processing loop. + */ + +int NetLoop(enum proto_t protocol) +{ + bd_t *bd = gd->bd; + int ret = -1; + + NetRestarted = 0; + NetDevExists = 0; + NetTryCount = 1; + debug_cond(DEBUG_INT_STATE, "--- NetLoop Entry\n"); + + bootstage_mark_name(BOOTSTAGE_ID_ETH_START, "eth_start"); + net_init(); + if (eth_is_on_demand_init() || protocol != NETCONS) { + eth_halt(); + eth_set_current(); + if (eth_init(bd) < 0) { + eth_halt(); + return -1; + } + } else + eth_init_state_only(bd); + +restart: +#ifdef CONFIG_USB_KEYBOARD + net_busy_flag = 0; +#endif + 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. + */ + debug_cond(DEBUG_INT_STATE, "--- NetLoop Init\n"); + NetInitLoop(); + + 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 +#if defined(CONFIG_CMD_LINK_LOCAL) + case LINKLOCAL: + link_local_start(); + 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, ... */ +#ifdef CONFIG_USB_KEYBOARD + net_busy_flag = 1; +#endif + + /* + * 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()) { + /* cancel any ARP that may not have completed */ + NetArpWaitPacketIP = 0; + + net_cleanup_loop(); + eth_halt(); + /* Invalidate the last protocol */ + eth_set_last_protocol(BOOTP); + + puts("\nAbort\n"); + /* include a debug print as well incase the debug + messages are directed to stderr */ + debug_cond(DEBUG_INT_STATE, "--- NetLoop Abort!\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, ... */ + debug_cond(DEBUG_INT_STATE, "--- NetLoop timeout\n"); + 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) { + printf("Bytes transferred = %ld (%lx hex)\n", + NetBootFileXferSize, + NetBootFileXferSize); + setenv_hex("filesize", NetBootFileXferSize); + setenv_hex("fileaddr", load_addr); + } + if (protocol != NETCONS) + eth_halt(); + else + eth_halt_state_only(); + + eth_set_last_protocol(protocol); + + ret = NetBootFileXferSize; + debug_cond(DEBUG_INT_STATE, "--- NetLoop Success!\n"); + goto done; + + case NETLOOP_FAIL: + net_cleanup_loop(); + /* Invalidate the last protocol */ + eth_set_last_protocol(BOOTP); + debug_cond(DEBUG_INT_STATE, "--- NetLoop Fail!\n"); + goto done; + + case NETLOOP_CONTINUE: + continue; + } + } + +done: +#ifdef CONFIG_USB_KEYBOARD + net_busy_flag = 0; +#endif +#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) +{ + debug_cond(DEBUG_INT_STATE, "--- NetLoop UDP handler set (%p)\n", 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) +{ + debug_cond(DEBUG_INT_STATE, "--- NetLoop ARP handler set (%p)\n", 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) { + debug_cond(DEBUG_INT_STATE, + "--- NetLoop timeout handler cancelled\n"); + timeHandler = (thand_f *)0; + } else { + debug_cond(DEBUG_INT_STATE, + "--- NetLoop timeout handler set (%p)\n", f); + timeHandler = f; + timeStart = get_timer(0); + timeDelta = iv * CONFIG_SYS_HZ / 1000; + } +} + +int NetSendUDPPacket(uchar *ether, IPaddr_t dest, int dport, int sport, + int payload_len) +{ + uchar *pkt; + int eth_hdr_size; + int pkt_hdr_size; + + /* make sure the NetTxPacket is initialized (NetInit() was called) */ + assert(NetTxPacket != NULL); + if (NetTxPacket == NULL) + return -1; + + /* 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; + + 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 MAC address was not discovered yet, do an ARP request */ + if (memcmp(ether, NetEtherNullAddr, 6) == 0) { + debug_cond(DEBUG_DEV_PKT, "sending ARP for %pI4\n", &dest); + + /* save the ip and eth addr for the packet to send after arp */ + NetArpWaitPacketIP = dest; + NetArpWaitPacketMAC = ether; + + /* 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_cond(DEBUG_DEV_PKT, "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_cond(DEBUG_NET_PKT, "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); + + 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_cond(DEBUG_NET_PKT, "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_cond(DEBUG_NET_PKT, "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_cond(DEBUG_NET_PKT, "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)) { + debug("len bad %d < %d\n", len, ntohs(ip->ip_len)); + return; + } + len = ntohs(ip->ip_len); + debug_cond(DEBUG_NET_PKT, "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)) { + debug("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 <sjg@chromium.org>: 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; + } + + debug_cond(DEBUG_DEV_PKT, + "received UDP (to=%pI4, from=%pI4, len=%d)\n", + &dst_ip, &src_ip, len); + +#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, + src_ip, + 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: + case LINKLOCAL: + 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; + } +} + +int net_update_ether(struct ethernet_hdr *et, uchar *addr, uint prot) +{ + ushort protlen; + + memcpy(et->et_dest, addr, 6); + memcpy(et->et_src, NetOurEther, 6); + protlen = ntohs(et->et_protlen); + if (protlen == PROT_VLAN) { + struct vlan_ethernet_hdr *vet = + (struct vlan_ethernet_hdr *)et; + vet->vet_type = htons(prot); + return VLAN_ETHER_HDR_SIZE; + } else if (protlen > 1514) { + et->et_protlen = htons(prot); + return ETHER_HDR_SIZE; + } else { + /* 802.2 + SNAP */ + struct e802_hdr *et802 = (struct e802_hdr *)et; + et802->et_prot = htons(prot); + return E802_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)); +} |