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Diffstat (limited to 'roms/u-boot/net/net.c')
| -rw-r--r-- | roms/u-boot/net/net.c | 1602 |
1 files changed, 1602 insertions, 0 deletions
diff --git a/roms/u-boot/net/net.c b/roms/u-boot/net/net.c new file mode 100644 index 000000000..b58f3062b --- /dev/null +++ b/roms/u-boot/net/net.c @@ -0,0 +1,1602 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * 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 + * + * + * WOL: + * + * Prerequisites: - own ethernet address + * We want: - magic packet or timeout + * Next step: none + */ + + +#include <common.h> +#include <bootstage.h> +#include <command.h> +#include <console.h> +#include <env.h> +#include <env_internal.h> +#include <errno.h> +#include <image.h> +#include <log.h> +#include <net.h> +#include <net/fastboot.h> +#include <net/tftp.h> +#if defined(CONFIG_CMD_PCAP) +#include <net/pcap.h> +#endif +#include <net/udp.h> +#if defined(CONFIG_LED_STATUS) +#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_WOL) +#include "wol.h" +#endif + +/** BOOTP EXTENTIONS **/ + +/* Our subnet mask (0=unknown) */ +struct in_addr net_netmask; +/* Our gateways IP address */ +struct in_addr net_gateway; +/* Our DNS IP address */ +struct in_addr net_dns_server; +#if defined(CONFIG_BOOTP_DNS2) +/* Our 2nd DNS IP address */ +struct in_addr net_dns_server2; +#endif + +/** END OF BOOTP EXTENTIONS **/ + +/* Our ethernet address */ +u8 net_ethaddr[6]; +/* Boot server enet address */ +u8 net_server_ethaddr[6]; +/* Our IP addr (0 = unknown) */ +struct in_addr net_ip; +/* Server IP addr (0 = unknown) */ +struct in_addr net_server_ip; +/* Current receive packet */ +uchar *net_rx_packet; +/* Current rx packet length */ +int net_rx_packet_len; +/* IP packet ID */ +static unsigned net_ip_id; +/* Ethernet bcast address */ +const u8 net_bcast_ethaddr[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; +const u8 net_null_ethaddr[6]; +#if defined(CONFIG_API) || defined(CONFIG_EFI_LOADER) +void (*push_packet)(void *, int len) = 0; +#endif +/* Network loop state */ +enum net_loop_state net_state; +/* Tried all network devices */ +int net_restart_wrap; +/* Network loop restarted */ +static int net_restarted; +/* At least one device configured */ +static int net_dev_exists; + +/* XXX in both little & big endian machines 0xFFFF == ntohs(-1) */ +/* default is without VLAN */ +ushort net_our_vlan = 0xFFFF; +/* ditto */ +ushort net_native_vlan = 0xFFFF; + +/* Boot File name */ +char net_boot_file_name[1024]; +/* Indicates whether the file name was specified on the command line */ +bool net_boot_file_name_explicit; +/* The actual transferred size of the bootfile (in bytes) */ +u32 net_boot_file_size; +/* Boot file size in blocks as reported by the DHCP server */ +u32 net_boot_file_expected_size_in_blocks; + +static uchar net_pkt_buf[(PKTBUFSRX+1) * PKTSIZE_ALIGN + PKTALIGN]; +/* Receive packets */ +uchar *net_rx_packets[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 *time_handler; +/* Time base value */ +static ulong time_start; +/* Current timeout value */ +static ulong time_delta; +/* THE transmit packet */ +uchar *net_tx_packet; + +static int net_check_prereq(enum proto_t protocol); + +static int net_try_count; + +int __maybe_unused net_busy_flag; + +/**********************************************************************/ + +static int on_ipaddr(const char *name, const char *value, enum env_op op, + int flags) +{ + if (flags & H_PROGRAMMATIC) + return 0; + + net_ip = string_to_ip(value); + + return 0; +} +U_BOOT_ENV_CALLBACK(ipaddr, on_ipaddr); + +static int on_gatewayip(const char *name, const char *value, enum env_op op, + int flags) +{ + if (flags & H_PROGRAMMATIC) + return 0; + + net_gateway = string_to_ip(value); + + return 0; +} +U_BOOT_ENV_CALLBACK(gatewayip, on_gatewayip); + +static int on_netmask(const char *name, const char *value, enum env_op op, + int flags) +{ + if (flags & H_PROGRAMMATIC) + return 0; + + net_netmask = string_to_ip(value); + + return 0; +} +U_BOOT_ENV_CALLBACK(netmask, on_netmask); + +static int on_serverip(const char *name, const char *value, enum env_op op, + int flags) +{ + if (flags & H_PROGRAMMATIC) + return 0; + + net_server_ip = string_to_ip(value); + + return 0; +} +U_BOOT_ENV_CALLBACK(serverip, on_serverip); + +static int on_nvlan(const char *name, const char *value, enum env_op op, + int flags) +{ + if (flags & H_PROGRAMMATIC) + return 0; + + net_native_vlan = string_to_vlan(value); + + return 0; +} +U_BOOT_ENV_CALLBACK(nvlan, on_nvlan); + +static int on_vlan(const char *name, const char *value, enum env_op op, + int flags) +{ + if (flags & H_PROGRAMMATIC) + return 0; + + net_our_vlan = string_to_vlan(value); + + return 0; +} +U_BOOT_ENV_CALLBACK(vlan, on_vlan); + +#if defined(CONFIG_CMD_DNS) +static int on_dnsip(const char *name, const char *value, enum env_op op, + int flags) +{ + if (flags & H_PROGRAMMATIC) + return 0; + + net_dns_server = string_to_ip(value); + + return 0; +} +U_BOOT_ENV_CALLBACK(dnsip, on_dnsip); +#endif + +/* + * 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) && !defined(CONFIG_SPL_BUILD) + const char *s = env_get("autoload"); + + if (s != NULL && strcmp(s, "NFS") == 0) { + if (net_check_prereq(NFS)) { +/* We aren't expecting to get a serverip, so just accept the assigned IP */ +#ifdef CONFIG_BOOTP_SERVERIP + net_set_state(NETLOOP_SUCCESS); +#else + printf("Cannot autoload with NFS\n"); + net_set_state(NETLOOP_FAIL); +#endif + return; + } + /* + * Use NFS to load the bootfile. + */ + nfs_start(); + return; + } +#endif + if (env_get_yesno("autoload") == 0) { + /* + * Just use BOOTP/RARP to configure system; + * Do not use TFTP to load the bootfile. + */ + net_set_state(NETLOOP_SUCCESS); + return; + } + if (net_check_prereq(TFTPGET)) { +/* We aren't expecting to get a serverip, so just accept the assigned IP */ +#ifdef CONFIG_BOOTP_SERVERIP + net_set_state(NETLOOP_SUCCESS); +#else + printf("Cannot autoload with TFTPGET\n"); + net_set_state(NETLOOP_FAIL); +#endif + return; + } + tftp_start(TFTPGET); +} + +static int net_init_loop(void) +{ + if (eth_get_dev()) + memcpy(net_ethaddr, eth_get_ethaddr(), 6); + else + /* + * Not ideal, but there's no way to get the actual error, and I + * don't feel like fixing all the users of eth_get_dev to deal + * with errors. + */ + return -ENONET; + + return 0; +} + +static void net_clear_handlers(void) +{ + net_set_udp_handler(NULL); + net_set_arp_handler(NULL); + net_set_timeout_handler(0, NULL); +} + +static void net_cleanup_loop(void) +{ + net_clear_handlers(); +} + +int net_init(void) +{ + static int first_call = 1; + + if (first_call) { + /* + * Setup packet buffers, aligned correctly. + */ + int i; + + net_tx_packet = &net_pkt_buf[0] + (PKTALIGN - 1); + net_tx_packet -= (ulong)net_tx_packet % PKTALIGN; + for (i = 0; i < PKTBUFSRX; i++) { + net_rx_packets[i] = net_tx_packet + + (i + 1) * PKTSIZE_ALIGN; + } + arp_init(); + net_clear_handlers(); + + /* Only need to setup buffer pointers once. */ + first_call = 0; + } + + return net_init_loop(); +} + +/**********************************************************************/ +/* + * Main network processing loop. + */ + +int net_loop(enum proto_t protocol) +{ + int ret = -EINVAL; + enum net_loop_state prev_net_state = net_state; + +#if defined(CONFIG_CMD_PING) + if (protocol != PING) + net_ping_ip.s_addr = 0; +#endif + net_restarted = 0; + net_dev_exists = 0; + net_try_count = 1; + debug_cond(DEBUG_INT_STATE, "--- net_loop Entry\n"); + + bootstage_mark_name(BOOTSTAGE_ID_ETH_START, "eth_start"); + net_init(); + if (eth_is_on_demand_init()) { + eth_halt(); + eth_set_current(); + ret = eth_init(); + if (ret < 0) { + eth_halt(); + return ret; + } + } else { + eth_init_state_only(); + } +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, "--- net_loop Init\n"); + net_init_loop(); + + switch (net_check_prereq(protocol)) { + case 1: + /* network not configured */ + eth_halt(); + net_set_state(prev_net_state); + return -ENODEV; + + case 2: + /* network device not configured */ + break; + + case 0: + net_dev_exists = 1; + net_boot_file_size = 0; + switch (protocol) { +#ifdef CONFIG_CMD_TFTPBOOT + case TFTPGET: +#ifdef CONFIG_CMD_TFTPPUT + case TFTPPUT: +#endif + /* always use ARP to get server ethernet address */ + tftp_start(protocol); + break; +#endif +#ifdef CONFIG_CMD_TFTPSRV + case TFTPSRV: + tftp_start_server(); + break; +#endif +#ifdef CONFIG_UDP_FUNCTION_FASTBOOT + case FASTBOOT: + fastboot_start_server(); + break; +#endif +#if defined(CONFIG_CMD_DHCP) + case DHCP: + bootp_reset(); + net_ip.s_addr = 0; + dhcp_request(); /* Basically same as BOOTP */ + break; +#endif +#if defined(CONFIG_CMD_BOOTP) + case BOOTP: + bootp_reset(); + net_ip.s_addr = 0; + bootp_request(); + break; +#endif +#if defined(CONFIG_CMD_RARP) + case RARP: + rarp_try = 0; + net_ip.s_addr = 0; + rarp_request(); + break; +#endif +#if defined(CONFIG_CMD_PING) + case PING: + ping_start(); + break; +#endif +#if defined(CONFIG_CMD_NFS) && !defined(CONFIG_SPL_BUILD) + case NFS: + nfs_start(); + break; +#endif +#if defined(CONFIG_CMD_CDP) + case CDP: + cdp_start(); + break; +#endif +#if defined(CONFIG_NETCONSOLE) && !defined(CONFIG_SPL_BUILD) + case NETCONS: + nc_start(); + break; +#endif +#if defined(CONFIG_CMD_DNS) + case DNS: + dns_start(); + break; +#endif +#if defined(CONFIG_CMD_LINK_LOCAL) + case LINKLOCAL: + link_local_start(); + break; +#endif +#if defined(CONFIG_CMD_WOL) + case WOL: + wol_start(); + break; +#endif + default: + break; + } + + if (IS_ENABLED(CONFIG_PROT_UDP) && protocol == UDP) + udp_start(); + + break; + } + +#if defined(CONFIG_MII) || defined(CONFIG_CMD_MII) +#if defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN) && \ + defined(CONFIG_LED_STATUS) && \ + defined(CONFIG_LED_STATUS_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(CONFIG_LED_STATUS_RED, CONFIG_LED_STATUS_OFF); + else + status_led_set(CONFIG_LED_STATUS_RED, CONFIG_LED_STATUS_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(); + if (arp_timeout_check() > 0) + time_start = get_timer(0); + + /* + * Check the ethernet for a new packet. The ethernet + * receive routine will process it. + * Most drivers return the most recent packet size, but not + * errors that may have happened. + */ + eth_rx(); + + /* + * Abort if ctrl-c was pressed. + */ + if (ctrlc()) { + /* cancel any ARP that may not have completed */ + net_arp_wait_packet_ip.s_addr = 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, "--- net_loop Abort!\n"); + ret = -EINTR; + goto done; + } + + /* + * Check for a timeout, and run the timeout handler + * if we have one. + */ + if (time_handler && + ((get_timer(0) - time_start) > time_delta)) { + thand_f *x; + +#if defined(CONFIG_MII) || defined(CONFIG_CMD_MII) +#if defined(CONFIG_SYS_FAULT_ECHO_LINK_DOWN) && \ + defined(CONFIG_LED_STATUS) && \ + defined(CONFIG_LED_STATUS_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(CONFIG_LED_STATUS_RED, + CONFIG_LED_STATUS_OFF); + else + status_led_set(CONFIG_LED_STATUS_RED, + CONFIG_LED_STATUS_ON); +#endif /* CONFIG_SYS_FAULT_ECHO_LINK_DOWN, ... */ +#endif /* CONFIG_MII, ... */ + debug_cond(DEBUG_INT_STATE, "--- net_loop timeout\n"); + x = time_handler; + time_handler = (thand_f *)0; + (*x)(); + } + + if (net_state == NETLOOP_FAIL) + ret = net_start_again(); + + switch (net_state) { + case NETLOOP_RESTART: + net_restarted = 1; + goto restart; + + case NETLOOP_SUCCESS: + net_cleanup_loop(); + if (net_boot_file_size > 0) { + printf("Bytes transferred = %d (%x hex)\n", + net_boot_file_size, net_boot_file_size); + env_set_hex("filesize", net_boot_file_size); + env_set_hex("fileaddr", image_load_addr); + } + if (protocol != NETCONS) + eth_halt(); + else + eth_halt_state_only(); + + eth_set_last_protocol(protocol); + + ret = net_boot_file_size; + debug_cond(DEBUG_INT_STATE, "--- net_loop Success!\n"); + goto done; + + case NETLOOP_FAIL: + net_cleanup_loop(); + /* Invalidate the last protocol */ + eth_set_last_protocol(BOOTP); + debug_cond(DEBUG_INT_STATE, "--- net_loop Fail!\n"); + ret = -ENONET; + 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 + net_set_state(prev_net_state); + +#if defined(CONFIG_CMD_PCAP) + if (pcap_active()) + pcap_print_status(); +#endif + return ret; +} + +/**********************************************************************/ + +static void start_again_timeout_handler(void) +{ + net_set_state(NETLOOP_RESTART); +} + +int net_start_again(void) +{ + char *nretry; + int retry_forever = 0; + unsigned long retrycnt = 0; + int ret; + + nretry = env_get("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 { + retrycnt = 0; + retry_forever = 0; + } + + if ((!retry_forever) && (net_try_count > retrycnt)) { + eth_halt(); + net_set_state(NETLOOP_FAIL); + /* + * We don't provide a way for the protocol to return an error, + * but this is almost always the reason. + */ + return -ETIMEDOUT; + } + + net_try_count++; + + eth_halt(); +#if !defined(CONFIG_NET_DO_NOT_TRY_ANOTHER) + eth_try_another(!net_restarted); +#endif + ret = eth_init(); + if (net_restart_wrap) { + net_restart_wrap = 0; + if (net_dev_exists) { + net_set_timeout_handler(10000UL, + start_again_timeout_handler); + net_set_udp_handler(NULL); + } else { + net_set_state(NETLOOP_FAIL); + } + } else { + net_set_state(NETLOOP_RESTART); + } + return ret; +} + +/**********************************************************************/ +/* + * Miscelaneous bits. + */ + +static void dummy_handler(uchar *pkt, unsigned dport, + struct in_addr 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, "--- net_loop 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, "--- net_loop 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 net_set_timeout_handler(ulong iv, thand_f *f) +{ + if (iv == 0) { + debug_cond(DEBUG_INT_STATE, + "--- net_loop timeout handler cancelled\n"); + time_handler = (thand_f *)0; + } else { + debug_cond(DEBUG_INT_STATE, + "--- net_loop timeout handler set (%p)\n", f); + time_handler = f; + time_start = get_timer(0); + time_delta = iv * CONFIG_SYS_HZ / 1000; + } +} + +uchar *net_get_async_tx_pkt_buf(void) +{ + if (arp_is_waiting()) + return arp_tx_packet; /* If we are waiting, we already sent */ + else + return net_tx_packet; +} + +int net_send_udp_packet(uchar *ether, struct in_addr dest, int dport, int sport, + int payload_len) +{ + return net_send_ip_packet(ether, dest, dport, sport, payload_len, + IPPROTO_UDP, 0, 0, 0); +} + +int net_send_ip_packet(uchar *ether, struct in_addr dest, int dport, int sport, + int payload_len, int proto, u8 action, u32 tcp_seq_num, + u32 tcp_ack_num) +{ + uchar *pkt; + int eth_hdr_size; + int pkt_hdr_size; + + /* make sure the net_tx_packet is initialized (net_init() was called) */ + assert(net_tx_packet != NULL); + if (net_tx_packet == NULL) + return -1; + + /* convert to new style broadcast */ + if (dest.s_addr == 0) + dest.s_addr = 0xFFFFFFFF; + + /* if broadcast, make the ether address a broadcast and don't do ARP */ + if (dest.s_addr == 0xFFFFFFFF) + ether = (uchar *)net_bcast_ethaddr; + + pkt = (uchar *)net_tx_packet; + + eth_hdr_size = net_set_ether(pkt, ether, PROT_IP); + + switch (proto) { + case IPPROTO_UDP: + net_set_udp_header(pkt + eth_hdr_size, dest, dport, sport, + payload_len); + pkt_hdr_size = eth_hdr_size + IP_UDP_HDR_SIZE; + break; + default: + return -EINVAL; + } + + /* if MAC address was not discovered yet, do an ARP request */ + if (memcmp(ether, net_null_ethaddr, 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 */ + net_arp_wait_packet_ip = dest; + arp_wait_packet_ethaddr = ether; + + /* size of the waiting packet */ + arp_wait_tx_packet_size = pkt_hdr_size + payload_len; + + /* and do the ARP request */ + arp_wait_try = 1; + arp_wait_timer_start = get_timer(0); + arp_request(); + return 1; /* waiting */ + } else { + debug_cond(DEBUG_DEV_PKT, "sending UDP to %pI4/%pM\n", + &dest, ether); + net_send_packet(net_tx_packet, 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 + */ +#define IP_PKTSIZE (CONFIG_NET_MAXDEFRAG) + +#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 *__net_defragment(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 *net_defragment(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 __net_defragment(ip, lenp); +} + +#else /* !CONFIG_IP_DEFRAG */ + +static inline struct ip_udp_hdr *net_defragment(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, + struct in_addr 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 net_process_received_packet(uchar *in_packet, int len) +{ + struct ethernet_hdr *et; + struct ip_udp_hdr *ip; + struct in_addr dst_ip; + struct in_addr 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"); + +#if defined(CONFIG_CMD_PCAP) + pcap_post(in_packet, len, false); +#endif + net_rx_packet = in_packet; + net_rx_packet_len = len; + et = (struct ethernet_hdr *)in_packet; + + /* too small packet? */ + if (len < ETHER_HDR_SIZE) + return; + +#if defined(CONFIG_API) || defined(CONFIG_EFI_LOADER) + if (push_packet) { + (*push_packet)(in_packet, len); + return; + } +#endif + +#if defined(CONFIG_CMD_CDP) + /* keep track if packet is CDP */ + iscdp = is_cdp_packet(et->et_dest); +#endif + + myvlanid = ntohs(net_our_vlan); + if (myvlanid == (ushort)-1) + myvlanid = VLAN_NONE; + mynvlanid = ntohs(net_native_vlan); + 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 *)(in_packet + E802_HDR_SIZE); + len -= E802_HDR_SIZE; + + } else if (eth_proto != PROT_VLAN) { /* normal packet */ + ip = (struct ip_udp_hdr *)(in_packet + 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(net_our_vlan) & 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 *)(in_packet + 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: + arp_receive(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 (!ip_checksum_ok((uchar *)ip, IP_HDR_SIZE)) { + debug("checksum bad\n"); + return; + } + /* If it is not for us, ignore it */ + dst_ip = net_read_ip(&ip->ip_dst); + if (net_ip.s_addr && dst_ip.s_addr != net_ip.s_addr && + dst_ip.s_addr != 0xFFFFFFFF) { + return; + } + /* Read source IP address for later use */ + src_ip = net_read_ip(&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 = net_defragment(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; + } + + if (ntohs(ip->udp_len) < UDP_HDR_SIZE || ntohs(ip->udp_len) > ntohs(ip->ip_len)) + 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; + u8 *sumptr; + ushort sumlen; + + xsum = ip->ip_p; + xsum += (ntohs(ip->udp_len)); + xsum += (ntohl(ip->ip_src.s_addr) >> 16) & 0x0000ffff; + xsum += (ntohl(ip->ip_src.s_addr) >> 0) & 0x0000ffff; + xsum += (ntohl(ip->ip_dst.s_addr) >> 16) & 0x0000ffff; + xsum += (ntohl(ip->ip_dst.s_addr) >> 0) & 0x0000ffff; + + sumlen = ntohs(ip->udp_len); + sumptr = (u8 *)&ip->udp_src; + + while (sumlen > 1) { + /* inlined ntohs() to avoid alignment errors */ + xsum += (sumptr[0] << 8) + sumptr[1]; + sumptr += 2; + sumlen -= 2; + } + if (sumlen > 0) + xsum += (sumptr[0] << 8) + sumptr[0]; + 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 + +#if defined(CONFIG_NETCONSOLE) && !defined(CONFIG_SPL_BUILD) + 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; +#ifdef CONFIG_CMD_WOL + case PROT_WOL: + wol_receive(ip, len); + break; +#endif + } +} + +/**********************************************************************/ + +static int net_check_prereq(enum proto_t protocol) +{ + switch (protocol) { + /* Fall through */ +#if defined(CONFIG_CMD_PING) + case PING: + if (net_ping_ip.s_addr == 0) { + puts("*** ERROR: ping address not given\n"); + return 1; + } + goto common; +#endif +#if defined(CONFIG_CMD_DNS) + case DNS: + if (net_dns_server.s_addr == 0) { + puts("*** ERROR: DNS server address not given\n"); + return 1; + } + goto common; +#endif +#if defined(CONFIG_PROT_UDP) + case UDP: + if (udp_prereq()) + return 1; + goto common; +#endif + +#if defined(CONFIG_CMD_NFS) + case NFS: +#endif + /* Fall through */ + case TFTPGET: + case TFTPPUT: + if (net_server_ip.s_addr == 0 && !is_serverip_in_cmd()) { + puts("*** ERROR: `serverip' not set\n"); + return 1; + } +#if defined(CONFIG_CMD_PING) || \ + defined(CONFIG_CMD_DNS) || defined(CONFIG_PROT_UDP) +common: +#endif + /* Fall through */ + + case NETCONS: + case FASTBOOT: + case TFTPSRV: + if (net_ip.s_addr == 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(net_ethaddr, "\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; + } + + net_start_again(); + return 2; + } + /* Fall through */ + default: + return 0; + } + return 0; /* OK */ +} +/**********************************************************************/ + +int +net_eth_hdr_size(void) +{ + ushort myvlanid; + + myvlanid = ntohs(net_our_vlan); + if (myvlanid == (ushort)-1) + myvlanid = VLAN_NONE; + + return ((myvlanid & VLAN_IDMASK) == VLAN_NONE) ? ETHER_HDR_SIZE : + VLAN_ETHER_HDR_SIZE; +} + +int net_set_ether(uchar *xet, const uchar *dest_ethaddr, uint prot) +{ + struct ethernet_hdr *et = (struct ethernet_hdr *)xet; + ushort myvlanid; + + myvlanid = ntohs(net_our_vlan); + if (myvlanid == (ushort)-1) + myvlanid = VLAN_NONE; + + memcpy(et->et_dest, dest_ethaddr, 6); + memcpy(et->et_src, net_ethaddr, 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, net_ethaddr, 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, struct in_addr dest, struct in_addr source, + u16 pkt_len, u8 proto) +{ + 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(pkt_len); + ip->ip_p = proto; + ip->ip_id = htons(net_ip_id++); + ip->ip_off = htons(IP_FLAGS_DFRAG); /* Don't fragment */ + ip->ip_ttl = 255; + ip->ip_sum = 0; + /* already in network byte order */ + net_copy_ip((void *)&ip->ip_src, &source); + /* already in network byte order */ + net_copy_ip((void *)&ip->ip_dst, &dest); + + ip->ip_sum = compute_ip_checksum(ip, IP_HDR_SIZE); +} + +void net_set_udp_header(uchar *pkt, struct in_addr 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, net_ip, IP_UDP_HDR_SIZE + len, + IPPROTO_UDP); + + 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 == '"')) { + ++src; + --size; + } + + while ((--size > 0) && src && *src && (*src != '"')) + *dst++ = *src++; + *dst = '\0'; +} + +int is_serverip_in_cmd(void) +{ + return !!strchr(net_boot_file_name, ':'); +} + +int net_parse_bootfile(struct in_addr *ipaddr, char *filename, int max_len) +{ + char *colon; + + if (net_boot_file_name[0] == '\0') + return 0; + + colon = strchr(net_boot_file_name, ':'); + if (colon) { + if (ipaddr) + *ipaddr = string_to_ip(net_boot_file_name); + strncpy(filename, colon + 1, max_len); + } else { + strncpy(filename, net_boot_file_name, max_len); + } + filename[max_len - 1] = '\0'; + + return 1; +} + +void ip_to_string(struct in_addr x, char *s) +{ + x.s_addr = ntohl(x.s_addr); + sprintf(s, "%d.%d.%d.%d", + (int) ((x.s_addr >> 24) & 0xff), + (int) ((x.s_addr >> 16) & 0xff), + (int) ((x.s_addr >> 8) & 0xff), + (int) ((x.s_addr >> 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 env_get_vlan(char *var) +{ + return string_to_vlan(env_get(var)); +} |