include/net.h

   1 /*
   2  *      LiMon Monitor (LiMon) - Network.
   3  *
   4  *      Copyright 1994 - 2000 Neil Russell.
   5  *      (See License)
   6  *      SPDX-License-Identifier:        GPL-2.0
   7  *
   8  * History
   9  *      9/16/00   bor  adapted to TQM823L/STK8xxL board, RARP/TFTP boot added
  10  */
  11
  12 #ifndef __NET_H__
  13 #define __NET_H__
  14
  15 #include <asm/cache.h>
  16 #include <asm/byteorder.h>      /* for nton* / ntoh* stuff */
  17
  18 #define DEBUG_LL_STATE 0        /* Link local state machine changes */
  19 #define DEBUG_DEV_PKT 0         /* Packets or info directed to the device */
  20 #define DEBUG_NET_PKT 0         /* Packets on info on the network at large */
  21 #define DEBUG_INT_STATE 0       /* Internal network state changes */
  22
  23 /*
  24  *      The number of receive packet buffers, and the required packet buffer
  25  *      alignment in memory.
  26  *
  27  */
  28
  29 #ifdef CONFIG_SYS_RX_ETH_BUFFER
  30 # define PKTBUFSRX      CONFIG_SYS_RX_ETH_BUFFER
  31 #else
  32 # define PKTBUFSRX      4
  33 #endif
  34
  35 #define PKTALIGN        ARCH_DMA_MINALIGN
  36
  37 /* ARP hardware address length */
  38 #define ARP_HLEN 6
  39 /*
  40  * The size of a MAC address in string form, each digit requires two chars
  41  * and five separator characters to form '00:00:00:00:00:00'.
  42  */
  43 #define ARP_HLEN_ASCII (ARP_HLEN * 2) + (ARP_HLEN - 1)
  44
  45 /* IPv4 addresses are always 32 bits in size */
  46 struct in_addr {
  47         __be32 s_addr;
  48 };
  49
  50 /**
  51  * An incoming packet handler.
  52  * @param pkt    pointer to the application packet
  53  * @param dport  destination UDP port
  54  * @param sip    source IP address
  55  * @param sport  source UDP port
  56  * @param len    packet length
  57  */
  58 typedef void rxhand_f(uchar *pkt, unsigned dport,
  59                       struct in_addr sip, unsigned sport,
  60                       unsigned len);
  61
  62 /**
  63  * An incoming ICMP packet handler.
  64  * @param type  ICMP type
  65  * @param code  ICMP code
  66  * @param dport destination UDP port
  67  * @param sip   source IP address
  68  * @param sport source UDP port
  69  * @param pkt   pointer to the ICMP packet data
  70  * @param len   packet length
  71  */
  72 typedef void rxhand_icmp_f(unsigned type, unsigned code, unsigned dport,
  73                 struct in_addr sip, unsigned sport, uchar *pkt, unsigned len);
  74
  75 /*
  76  *      A timeout handler.  Called after time interval has expired.
  77  */
  78 typedef void    thand_f(void);
  79
  80 enum eth_state_t {
  81         ETH_STATE_INIT,
  82         ETH_STATE_PASSIVE,
  83         ETH_STATE_ACTIVE
  84 };
  85
  86 #ifdef CONFIG_DM_ETH
  87 /**
  88  * struct eth_pdata - Platform data for Ethernet MAC controllers
  89  *
  90  * @iobase: The base address of the hardware registers
  91  * @enetaddr: The Ethernet MAC address that is loaded from EEPROM or env
  92  * @phy_interface: PHY interface to use - see PHY_INTERFACE_MODE_...
  93  * @max_speed: Maximum speed of Ethernet connection supported by MAC
  94  */
  95 struct eth_pdata {
  96         phys_addr_t iobase;
  97         unsigned char enetaddr[ARP_HLEN];
  98         int phy_interface;
  99         int max_speed;
 100 };
 101
 102 enum eth_recv_flags {
 103         /*
 104          * Check hardware device for new packets (otherwise only return those
 105          * which are already in the memory buffer ready to process)
 106          */
 107         ETH_RECV_CHECK_DEVICE           = 1 << 0,
 108 };
 109
 110 /**
 111  * struct eth_ops - functions of Ethernet MAC controllers
 112  *
 113  * start: Prepare the hardware to send and receive packets
 114  * send: Send the bytes passed in "packet" as a packet on the wire
 115  * recv: Check if the hardware received a packet. If so, set the pointer to the
 116  *       packet buffer in the packetp parameter. If not, return an error or 0 to
 117  *       indicate that the hardware receive FIFO is empty. If 0 is returned, the
 118  *       network stack will not process the empty packet, but free_pkt() will be
 119  *       called if supplied
 120  * free_pkt: Give the driver an opportunity to manage its packet buffer memory
 121  *           when the network stack is finished processing it. This will only be
 122  *           called when no error was returned from recv - optional
 123  * stop: Stop the hardware from looking for packets - may be called even if
 124  *       state == PASSIVE
 125  * mcast: Join or leave a multicast group (for TFTP) - optional
 126  * write_hwaddr: Write a MAC address to the hardware (used to pass it to Linux
 127  *               on some platforms like ARM). This function expects the
 128  *               eth_pdata::enetaddr field to be populated. The method can
 129  *               return -ENOSYS to indicate that this is not implemented for
 130                  this hardware - optional.
 131  * read_rom_hwaddr: Some devices have a backup of the MAC address stored in a
 132  *                  ROM on the board. This is how the driver should expose it
 133  *                  to the network stack. This function should fill in the
 134  *                  eth_pdata::enetaddr field - optional
 135  */
 136 struct eth_ops {
 137         int (*start)(struct udevice *dev);
 138         int (*send)(struct udevice *dev, void *packet, int length);
 139         int (*recv)(struct udevice *dev, int flags, uchar **packetp);
 140         int (*free_pkt)(struct udevice *dev, uchar *packet, int length);
 141         void (*stop)(struct udevice *dev);
 142 #ifdef CONFIG_MCAST_TFTP
 143         int (*mcast)(struct udevice *dev, const u8 *enetaddr, int join);
 144 #endif
 145         int (*write_hwaddr)(struct udevice *dev);
 146         int (*read_rom_hwaddr)(struct udevice *dev);
 147 };
 148
 149 #define eth_get_ops(dev) ((struct eth_ops *)(dev)->driver->ops)
 150
 151 struct udevice *eth_get_dev(void); /* get the current device */
 152 /*
 153  * The devname can be either an exact name given by the driver or device tree
 154  * or it can be an alias of the form "eth%d"
 155  */
 156 struct udevice *eth_get_dev_by_name(const char *devname);
 157 unsigned char *eth_get_ethaddr(void); /* get the current device MAC */
 158
 159 /* Used only when NetConsole is enabled */
 160 int eth_is_active(struct udevice *dev); /* Test device for active state */
 161 int eth_init_state_only(void); /* Set active state */
 162 void eth_halt_state_only(void); /* Set passive state */
 163 #endif
 164
 165 #ifndef CONFIG_DM_ETH
 166 struct eth_device {
 167 #define ETH_NAME_LEN 16
 168         char name[ETH_NAME_LEN];
 169         unsigned char enetaddr[ARP_HLEN];
 170         phys_addr_t iobase;
 171         int state;
 172
 173         int (*init)(struct eth_device *, bd_t *);
 174         int (*send)(struct eth_device *, void *packet, int length);
 175         int (*recv)(struct eth_device *);
 176         void (*halt)(struct eth_device *);
 177 #ifdef CONFIG_MCAST_TFTP
 178         int (*mcast)(struct eth_device *, const u8 *enetaddr, u8 set);
 179 #endif
 180         int (*write_hwaddr)(struct eth_device *);
 181         struct eth_device *next;
 182         int index;
 183         void *priv;
 184 };
 185
 186 int eth_register(struct eth_device *dev);/* Register network device */
 187 int eth_unregister(struct eth_device *dev);/* Remove network device */
 188
 189 extern struct eth_device *eth_current;
 190
 191 static __always_inline struct eth_device *eth_get_dev(void)
 192 {
 193         return eth_current;
 194 }
 195 struct eth_device *eth_get_dev_by_name(const char *devname);
 196 struct eth_device *eth_get_dev_by_index(int index); /* get dev @ index */
 197
 198 /* get the current device MAC */
 199 static inline unsigned char *eth_get_ethaddr(void)
 200 {
 201         if (eth_current)
 202                 return eth_current->enetaddr;
 203         return NULL;
 204 }
 205
 206 /* Used only when NetConsole is enabled */
 207 int eth_is_active(struct eth_device *dev); /* Test device for active state */
 208 /* Set active state */
 209 static __always_inline int eth_init_state_only(void)
 210 {
 211         eth_get_dev()->state = ETH_STATE_ACTIVE;
 212
 213         return 0;
 214 }
 215 /* Set passive state */
 216 static __always_inline void eth_halt_state_only(void)
 217 {
 218         eth_get_dev()->state = ETH_STATE_PASSIVE;
 219 }
 220
 221 /*
 222  * Set the hardware address for an ethernet interface based on 'eth%daddr'
 223  * environment variable (or just 'ethaddr' if eth_number is 0).
 224  * Args:
 225  *      base_name - base name for device (normally "eth")
 226  *      eth_number - value of %d (0 for first device of this type)
 227  * Returns:
 228  *      0 is success, non-zero is error status from driver.
 229  */
 230 int eth_write_hwaddr(struct eth_device *dev, const char *base_name,
 231                      int eth_number);
 232
 233 int usb_eth_initialize(bd_t *bi);
 234 #endif
 235
 236 int eth_initialize(void);               /* Initialize network subsystem */
 237 void eth_try_another(int first_restart);        /* Change the device */
 238 void eth_set_current(void);             /* set nterface to ethcur var */
 239
 240 int eth_get_dev_index(void);            /* get the device index */
 241 void eth_parse_enetaddr(const char *addr, uchar *enetaddr);
 242 int eth_env_get_enetaddr(const char *name, uchar *enetaddr);
 243 int eth_env_set_enetaddr(const char *name, const uchar *enetaddr);
 244
 245 /**
 246  * eth_env_set_enetaddr_by_index() - set the MAC address environment variable
 247  *
 248  * This sets up an environment variable with the given MAC address (@enetaddr).
 249  * The environment variable to be set is defined by <@base_name><@index>addr.
 250  * If @index is 0 it is omitted. For common Ethernet this means ethaddr,
 251  * eth1addr, etc.
 252  *
 253  * @base_name:  Base name for variable, typically "eth"
 254  * @index:      Index of interface being updated (>=0)
 255  * @enetaddr:   Pointer to MAC address to put into the variable
 256  * @return 0 if OK, other value on error
 257  */
 258 int eth_env_set_enetaddr_by_index(const char *base_name, int index,
 259                                  uchar *enetaddr);
 260
 261
 262 /*
 263  * Initialize USB ethernet device with CONFIG_DM_ETH
 264  * Returns:
 265  *      0 is success, non-zero is error status.
 266  */
 267 int usb_ether_init(void);
 268
 269 /*
 270  * Get the hardware address for an ethernet interface .
 271  * Args:
 272  *      base_name - base name for device (normally "eth")
 273  *      index - device index number (0 for first)
 274  *      enetaddr - returns 6 byte hardware address
 275  * Returns:
 276  *      Return true if the address is valid.
 277  */
 278 int eth_env_get_enetaddr_by_index(const char *base_name, int index,
 279                                  uchar *enetaddr);
 280
 281 int eth_init(void);                     /* Initialize the device */
 282 int eth_send(void *packet, int length);    /* Send a packet */
 283
 284 #if defined(CONFIG_API) || defined(CONFIG_EFI_LOADER)
 285 int eth_receive(void *packet, int length); /* Receive a packet*/
 286 extern void (*push_packet)(void *packet, int length);
 287 #endif
 288 int eth_rx(void);                       /* Check for received packets */
 289 void eth_halt(void);                    /* stop SCC */
 290 const char *eth_get_name(void);         /* get name of current device */
 291
 292 #ifdef CONFIG_MCAST_TFTP
 293 int eth_mcast_join(struct in_addr mcast_addr, int join);
 294 u32 ether_crc(size_t len, unsigned char const *p);
 295 #endif
 296
 297
 298 /**********************************************************************/
 299 /*
 300  *      Protocol headers.
 301  */
 302
 303 /*
 304  *      Ethernet header
 305  */
 306
 307 struct ethernet_hdr {
 308         u8              et_dest[ARP_HLEN];      /* Destination node     */
 309         u8              et_src[ARP_HLEN];       /* Source node          */
 310         u16             et_protlen;             /* Protocol or length   */
 311 } __attribute__((packed));
 312
 313 /* Ethernet header size */
 314 #define ETHER_HDR_SIZE  (sizeof(struct ethernet_hdr))
 315
 316 #define ETH_FCS_LEN     4               /* Octets in the FCS            */
 317
 318 struct e802_hdr {
 319         u8              et_dest[ARP_HLEN];      /* Destination node     */
 320         u8              et_src[ARP_HLEN];       /* Source node          */
 321         u16             et_protlen;             /* Protocol or length   */
 322         u8              et_dsap;                /* 802 DSAP             */
 323         u8              et_ssap;                /* 802 SSAP             */
 324         u8              et_ctl;                 /* 802 control          */
 325         u8              et_snap1;               /* SNAP                 */
 326         u8              et_snap2;
 327         u8              et_snap3;
 328         u16             et_prot;                /* 802 protocol         */
 329 } __attribute__((packed));
 330
 331 /* 802 + SNAP + ethernet header size */
 332 #define E802_HDR_SIZE   (sizeof(struct e802_hdr))
 333
 334 /*
 335  *      Virtual LAN Ethernet header
 336  */
 337 struct vlan_ethernet_hdr {
 338         u8              vet_dest[ARP_HLEN];     /* Destination node     */
 339         u8              vet_src[ARP_HLEN];      /* Source node          */
 340         u16             vet_vlan_type;          /* PROT_VLAN            */
 341         u16             vet_tag;                /* TAG of VLAN          */
 342         u16             vet_type;               /* protocol type        */
 343 } __attribute__((packed));
 344
 345 /* VLAN Ethernet header size */
 346 #define VLAN_ETHER_HDR_SIZE     (sizeof(struct vlan_ethernet_hdr))
 347
 348 #define PROT_IP         0x0800          /* IP protocol                  */
 349 #define PROT_ARP        0x0806          /* IP ARP protocol              */
 350 #define PROT_RARP       0x8035          /* IP ARP protocol              */
 351 #define PROT_VLAN       0x8100          /* IEEE 802.1q protocol         */
 352 #define PROT_IPV6       0x86dd          /* IPv6 over bluebook           */
 353 #define PROT_PPP_SES    0x8864          /* PPPoE session messages       */
 354
 355 #define IPPROTO_ICMP     1      /* Internet Control Message Protocol    */
 356 #define IPPROTO_UDP     17      /* User Datagram Protocol               */
 357
 358 /*
 359  *      Internet Protocol (IP) header.
 360  */
 361 struct ip_hdr {
 362         u8              ip_hl_v;        /* header length and version    */
 363         u8              ip_tos;         /* type of service              */
 364         u16             ip_len;         /* total length                 */
 365         u16             ip_id;          /* identification               */
 366         u16             ip_off;         /* fragment offset field        */
 367         u8              ip_ttl;         /* time to live                 */
 368         u8              ip_p;           /* protocol                     */
 369         u16             ip_sum;         /* checksum                     */
 370         struct in_addr  ip_src;         /* Source IP address            */
 371         struct in_addr  ip_dst;         /* Destination IP address       */
 372 } __attribute__((packed));
 373
 374 #define IP_OFFS         0x1fff /* ip offset *= 8 */
 375 #define IP_FLAGS        0xe000 /* first 3 bits */
 376 #define IP_FLAGS_RES    0x8000 /* reserved */
 377 #define IP_FLAGS_DFRAG  0x4000 /* don't fragments */
 378 #define IP_FLAGS_MFRAG  0x2000 /* more fragments */
 379
 380 #define IP_HDR_SIZE             (sizeof(struct ip_hdr))
 381
 382 /*
 383  *      Internet Protocol (IP) + UDP header.
 384  */
 385 struct ip_udp_hdr {
 386         u8              ip_hl_v;        /* header length and version    */
 387         u8              ip_tos;         /* type of service              */
 388         u16             ip_len;         /* total length                 */
 389         u16             ip_id;          /* identification               */
 390         u16             ip_off;         /* fragment offset field        */
 391         u8              ip_ttl;         /* time to live                 */
 392         u8              ip_p;           /* protocol                     */
 393         u16             ip_sum;         /* checksum                     */
 394         struct in_addr  ip_src;         /* Source IP address            */
 395         struct in_addr  ip_dst;         /* Destination IP address       */
 396         u16             udp_src;        /* UDP source port              */
 397         u16             udp_dst;        /* UDP destination port         */
 398         u16             udp_len;        /* Length of UDP packet         */
 399         u16             udp_xsum;       /* Checksum                     */
 400 } __attribute__((packed));
 401
 402 #define IP_UDP_HDR_SIZE         (sizeof(struct ip_udp_hdr))
 403 #define UDP_HDR_SIZE            (IP_UDP_HDR_SIZE - IP_HDR_SIZE)
 404
 405 /*
 406  *      Address Resolution Protocol (ARP) header.
 407  */
 408 struct arp_hdr {
 409         u16             ar_hrd;         /* Format of hardware address   */
 410 #   define ARP_ETHER        1           /* Ethernet  hardware address   */
 411         u16             ar_pro;         /* Format of protocol address   */
 412         u8              ar_hln;         /* Length of hardware address   */
 413         u8              ar_pln;         /* Length of protocol address   */
 414 #   define ARP_PLEN     4
 415         u16             ar_op;          /* Operation                    */
 416 #   define ARPOP_REQUEST    1           /* Request  to resolve  address */
 417 #   define ARPOP_REPLY      2           /* Response to previous request */
 418
 419 #   define RARPOP_REQUEST   3           /* Request  to resolve  address */
 420 #   define RARPOP_REPLY     4           /* Response to previous request */
 421
 422         /*
 423          * The remaining fields are variable in size, according to
 424          * the sizes above, and are defined as appropriate for
 425          * specific hardware/protocol combinations.
 426          */
 427         u8              ar_data[0];
 428 #define ar_sha          ar_data[0]
 429 #define ar_spa          ar_data[ARP_HLEN]
 430 #define ar_tha          ar_data[ARP_HLEN + ARP_PLEN]
 431 #define ar_tpa          ar_data[ARP_HLEN + ARP_PLEN + ARP_HLEN]
 432 #if 0
 433         u8              ar_sha[];       /* Sender hardware address      */
 434         u8              ar_spa[];       /* Sender protocol address      */
 435         u8              ar_tha[];       /* Target hardware address      */
 436         u8              ar_tpa[];       /* Target protocol address      */
 437 #endif /* 0 */
 438 } __attribute__((packed));
 439
 440 #define ARP_HDR_SIZE    (8+20)          /* Size assuming ethernet       */
 441
 442 /*
 443  * ICMP stuff (just enough to handle (host) redirect messages)
 444  */
 445 #define ICMP_ECHO_REPLY         0       /* Echo reply                   */
 446 #define ICMP_NOT_REACH          3       /* Detination unreachable       */
 447 #define ICMP_REDIRECT           5       /* Redirect (change route)      */
 448 #define ICMP_ECHO_REQUEST       8       /* Echo request                 */
 449
 450 /* Codes for REDIRECT. */
 451 #define ICMP_REDIR_NET          0       /* Redirect Net                 */
 452 #define ICMP_REDIR_HOST         1       /* Redirect Host                */
 453
 454 /* Codes for NOT_REACH */
 455 #define ICMP_NOT_REACH_PORT     3       /* Port unreachable             */
 456
 457 struct icmp_hdr {
 458         u8              type;
 459         u8              code;
 460         u16             checksum;
 461         union {
 462                 struct {
 463                         u16     id;
 464                         u16     sequence;
 465                 } echo;
 466                 u32     gateway;
 467                 struct {
 468                         u16     unused;
 469                         u16     mtu;
 470                 } frag;
 471                 u8 data[0];
 472         } un;
 473 } __attribute__((packed));
 474
 475 #define ICMP_HDR_SIZE           (sizeof(struct icmp_hdr))
 476 #define IP_ICMP_HDR_SIZE        (IP_HDR_SIZE + ICMP_HDR_SIZE)
 477
 478 /*
 479  * Maximum packet size; used to allocate packet storage. Use
 480  * the maxium Ethernet frame size as specified by the Ethernet
 481  * standard including the 802.1Q tag (VLAN tagging).
 482  * maximum packet size =  1522
 483  * maximum packet size and multiple of 32 bytes =  1536
 484  */
 485 #define PKTSIZE                 1522
 486 #define PKTSIZE_ALIGN           1536
 487
 488 /*
 489  * Maximum receive ring size; that is, the number of packets
 490  * we can buffer before overflow happens. Basically, this just
 491  * needs to be enough to prevent a packet being discarded while
 492  * we are processing the previous one.
 493  */
 494 #define RINGSZ          4
 495 #define RINGSZ_LOG2     2
 496
 497 /**********************************************************************/
 498 /*
 499  *      Globals.
 500  *
 501  * Note:
 502  *
 503  * All variables of type struct in_addr are stored in NETWORK byte order
 504  * (big endian).
 505  */
 506
 507 /* net.c */
 508 /** BOOTP EXTENTIONS **/
 509 extern struct in_addr net_gateway;      /* Our gateway IP address */
 510 extern struct in_addr net_netmask;      /* Our subnet mask (0 = unknown) */
 511 /* Our Domain Name Server (0 = unknown) */
 512 extern struct in_addr net_dns_server;
 513 #if defined(CONFIG_BOOTP_DNS2)
 514 /* Our 2nd Domain Name Server (0 = unknown) */
 515 extern struct in_addr net_dns_server2;
 516 #endif
 517 extern char     net_nis_domain[32];     /* Our IS domain */
 518 extern char     net_hostname[32];       /* Our hostname */
 519 extern char     net_root_path[64];      /* Our root path */
 520 /** END OF BOOTP EXTENTIONS **/
 521 extern u8               net_ethaddr[ARP_HLEN];          /* Our ethernet address */
 522 extern u8               net_server_ethaddr[ARP_HLEN];   /* Boot server enet address */
 523 extern struct in_addr   net_ip;         /* Our    IP addr (0 = unknown) */
 524 extern struct in_addr   net_server_ip;  /* Server IP addr (0 = unknown) */
 525 extern uchar            *net_tx_packet;         /* THE transmit packet */
 526 extern uchar            *net_rx_packets[PKTBUFSRX]; /* Receive packets */
 527 extern uchar            *net_rx_packet;         /* Current receive packet */
 528 extern int              net_rx_packet_len;      /* Current rx packet length */
 529 extern const u8         net_bcast_ethaddr[ARP_HLEN];    /* Ethernet broadcast address */
 530 extern const u8         net_null_ethaddr[ARP_HLEN];
 531
 532 #define VLAN_NONE       4095                    /* untagged */
 533 #define VLAN_IDMASK     0x0fff                  /* mask of valid vlan id */
 534 extern ushort           net_our_vlan;           /* Our VLAN */
 535 extern ushort           net_native_vlan;        /* Our Native VLAN */
 536
 537 extern int              net_restart_wrap;       /* Tried all network devices */
 538
 539 enum proto_t {
 540         BOOTP, RARP, ARP, TFTPGET, DHCP, PING, DNS, NFS, CDP, NETCONS, SNTP,
 541         TFTPSRV, TFTPPUT, LINKLOCAL
 542 };
 543
 544 extern char     net_boot_file_name[1024];/* Boot File name */
 545 /* The actual transferred size of the bootfile (in bytes) */
 546 extern u32      net_boot_file_size;
 547 /* Boot file size in blocks as reported by the DHCP server */
 548 extern u32      net_boot_file_expected_size_in_blocks;
 549
 550 #if defined(CONFIG_CMD_DNS)
 551 extern char *net_dns_resolve;           /* The host to resolve  */
 552 extern char *net_dns_env_var;           /* the env var to put the ip into */
 553 #endif
 554
 555 #if defined(CONFIG_CMD_PING)
 556 extern struct in_addr net_ping_ip;      /* the ip address to ping */
 557 #endif
 558
 559 #if defined(CONFIG_CMD_CDP)
 560 /* when CDP completes these hold the return values */
 561 extern ushort cdp_native_vlan;          /* CDP returned native VLAN */
 562 extern ushort cdp_appliance_vlan;       /* CDP returned appliance VLAN */
 563
 564 /*
 565  * Check for a CDP packet by examining the received MAC address field
 566  */
 567 static inline int is_cdp_packet(const uchar *ethaddr)
 568 {
 569         extern const u8 net_cdp_ethaddr[ARP_HLEN];
 570
 571         return memcmp(ethaddr, net_cdp_ethaddr, ARP_HLEN) == 0;
 572 }
 573 #endif
 574
 575 #if defined(CONFIG_CMD_SNTP)
 576 extern struct in_addr   net_ntp_server;         /* the ip address to NTP */
 577 extern int net_ntp_time_offset;                 /* offset time from UTC */
 578 #endif
 579
 580 #if defined(CONFIG_MCAST_TFTP)
 581 extern struct in_addr net_mcast_addr;
 582 #endif
 583
 584 /* Initialize the network adapter */
 585 void net_init(void);
 586 int net_loop(enum proto_t);
 587
 588 /* Load failed.  Start again. */
 589 int net_start_again(void);
 590
 591 /* Get size of the ethernet header when we send */
 592 int net_eth_hdr_size(void);
 593
 594 /* Set ethernet header; returns the size of the header */
 595 int net_set_ether(uchar *xet, const uchar *dest_ethaddr, uint prot);
 596 int net_update_ether(struct ethernet_hdr *et, uchar *addr, uint prot);
 597
 598 /* Set IP header */
 599 void net_set_ip_header(uchar *pkt, struct in_addr dest, struct in_addr source);
 600 void net_set_udp_header(uchar *pkt, struct in_addr dest, int dport,
 601                                 int sport, int len);
 602
 603 /**
 604  * compute_ip_checksum() - Compute IP checksum
 605  *
 606  * @addr:       Address to check (must be 16-bit aligned)
 607  * @nbytes:     Number of bytes to check (normally a multiple of 2)
 608  * @return 16-bit IP checksum
 609  */
 610 unsigned compute_ip_checksum(const void *addr, unsigned nbytes);
 611
 612 /**
 613  * add_ip_checksums() - add two IP checksums
 614  *
 615  * @offset:     Offset of first sum (if odd we do a byte-swap)
 616  * @sum:        First checksum
 617  * @new_sum:    New checksum to add
 618  * @return updated 16-bit IP checksum
 619  */
 620 unsigned add_ip_checksums(unsigned offset, unsigned sum, unsigned new_sum);
 621
 622 /**
 623  * ip_checksum_ok() - check if a checksum is correct
 624  *
 625  * This works by making sure the checksum sums to 0
 626  *
 627  * @addr:       Address to check (must be 16-bit aligned)
 628  * @nbytes:     Number of bytes to check (normally a multiple of 2)
 629  * @return true if the checksum matches, false if not
 630  */
 631 int ip_checksum_ok(const void *addr, unsigned nbytes);
 632
 633 /* Callbacks */
 634 rxhand_f *net_get_udp_handler(void);    /* Get UDP RX packet handler */
 635 void net_set_udp_handler(rxhand_f *);   /* Set UDP RX packet handler */
 636 rxhand_f *net_get_arp_handler(void);    /* Get ARP RX packet handler */
 637 void net_set_arp_handler(rxhand_f *);   /* Set ARP RX packet handler */
 638 void net_set_icmp_handler(rxhand_icmp_f *f); /* Set ICMP RX handler */
 639 void net_set_timeout_handler(ulong, thand_f *);/* Set timeout handler */
 640
 641 /* Network loop state */
 642 enum net_loop_state {
 643         NETLOOP_CONTINUE,
 644         NETLOOP_RESTART,
 645         NETLOOP_SUCCESS,
 646         NETLOOP_FAIL
 647 };
 648 extern enum net_loop_state net_state;
 649
 650 static inline void net_set_state(enum net_loop_state state)
 651 {
 652         debug_cond(DEBUG_INT_STATE, "--- NetState set to %d\n", state);
 653         net_state = state;
 654 }
 655
 656 /* Transmit a packet */
 657 static inline void net_send_packet(uchar *pkt, int len)
 658 {
 659         /* Currently no way to return errors from eth_send() */
 660         (void) eth_send(pkt, len);
 661 }
 662
 663 /*
 664  * Transmit "net_tx_packet" as UDP packet, performing ARP request if needed
 665  *  (ether will be populated)
 666  *
 667  * @param ether Raw packet buffer
 668  * @param dest IP address to send the datagram to
 669  * @param dport Destination UDP port
 670  * @param sport Source UDP port
 671  * @param payload_len Length of data after the UDP header
 672  */
 673 int net_send_udp_packet(uchar *ether, struct in_addr dest, int dport,
 674                         int sport, int payload_len);
 675
 676 /* Processes a received packet */
 677 void net_process_received_packet(uchar *in_packet, int len);
 678
 679 #ifdef CONFIG_NETCONSOLE
 680 void nc_start(void);
 681 int nc_input_packet(uchar *pkt, struct in_addr src_ip, unsigned dest_port,
 682         unsigned src_port, unsigned len);
 683 #endif
 684
 685 static __always_inline int eth_is_on_demand_init(void)
 686 {
 687 #ifdef CONFIG_NETCONSOLE
 688         extern enum proto_t net_loop_last_protocol;
 689
 690         return net_loop_last_protocol != NETCONS;
 691 #else
 692         return 1;
 693 #endif
 694 }
 695
 696 static inline void eth_set_last_protocol(int protocol)
 697 {
 698 #ifdef CONFIG_NETCONSOLE
 699         extern enum proto_t net_loop_last_protocol;
 700
 701         net_loop_last_protocol = protocol;
 702 #endif
 703 }
 704
 705 /*
 706  * Check if autoload is enabled. If so, use either NFS or TFTP to download
 707  * the boot file.
 708  */
 709 void net_auto_load(void);
 710
 711 /*
 712  * The following functions are a bit ugly, but necessary to deal with
 713  * alignment restrictions on ARM.
 714  *
 715  * We're using inline functions, which had the smallest memory
 716  * footprint in our tests.
 717  */
 718 /* return IP *in network byteorder* */
 719 static inline struct in_addr net_read_ip(void *from)
 720 {
 721         struct in_addr ip;
 722
 723         memcpy((void *)&ip, (void *)from, sizeof(ip));
 724         return ip;
 725 }
 726
 727 /* return ulong *in network byteorder* */
 728 static inline u32 net_read_u32(u32 *from)
 729 {
 730         u32 l;
 731
 732         memcpy((void *)&l, (void *)from, sizeof(l));
 733         return l;
 734 }
 735
 736 /* write IP *in network byteorder* */
 737 static inline void net_write_ip(void *to, struct in_addr ip)
 738 {
 739         memcpy(to, (void *)&ip, sizeof(ip));
 740 }
 741
 742 /* copy IP */
 743 static inline void net_copy_ip(void *to, void *from)
 744 {
 745         memcpy((void *)to, from, sizeof(struct in_addr));
 746 }
 747
 748 /* copy ulong */
 749 static inline void net_copy_u32(u32 *to, u32 *from)
 750 {
 751         memcpy((void *)to, (void *)from, sizeof(u32));
 752 }
 753
 754 /**
 755  * is_zero_ethaddr - Determine if give Ethernet address is all zeros.
 756  * @addr: Pointer to a six-byte array containing the Ethernet address
 757  *
 758  * Return true if the address is all zeroes.
 759  */
 760 static inline int is_zero_ethaddr(const u8 *addr)
 761 {
 762         return !(addr[0] | addr[1] | addr[2] | addr[3] | addr[4] | addr[5]);
 763 }
 764
 765 /**
 766  * is_multicast_ethaddr - Determine if the Ethernet address is a multicast.
 767  * @addr: Pointer to a six-byte array containing the Ethernet address
 768  *
 769  * Return true if the address is a multicast address.
 770  * By definition the broadcast address is also a multicast address.
 771  */
 772 static inline int is_multicast_ethaddr(const u8 *addr)
 773 {
 774         return 0x01 & addr[0];
 775 }
 776
 777 /*
 778  * is_broadcast_ethaddr - Determine if the Ethernet address is broadcast
 779  * @addr: Pointer to a six-byte array containing the Ethernet address
 780  *
 781  * Return true if the address is the broadcast address.
 782  */
 783 static inline int is_broadcast_ethaddr(const u8 *addr)
 784 {
 785         return (addr[0] & addr[1] & addr[2] & addr[3] & addr[4] & addr[5]) ==
 786                 0xff;
 787 }
 788
 789 /*
 790  * is_valid_ethaddr - Determine if the given Ethernet address is valid
 791  * @addr: Pointer to a six-byte array containing the Ethernet address
 792  *
 793  * Check that the Ethernet address (MAC) is not 00:00:00:00:00:00, is not
 794  * a multicast address, and is not FF:FF:FF:FF:FF:FF.
 795  *
 796  * Return true if the address is valid.
 797  */
 798 static inline int is_valid_ethaddr(const u8 *addr)
 799 {
 800         /* FF:FF:FF:FF:FF:FF is a multicast address so we don't need to
 801          * explicitly check for it here. */
 802         return !is_multicast_ethaddr(addr) && !is_zero_ethaddr(addr);
 803 }
 804
 805 /**
 806  * net_random_ethaddr - Generate software assigned random Ethernet address
 807  * @addr: Pointer to a six-byte array containing the Ethernet address
 808  *
 809  * Generate a random Ethernet address (MAC) that is not multicast
 810  * and has the local assigned bit set.
 811  */
 812 static inline void net_random_ethaddr(uchar *addr)
 813 {
 814         int i;
 815         unsigned int seed = get_timer(0);
 816
 817         for (i = 0; i < 6; i++)
 818                 addr[i] = rand_r(&seed);
 819
 820         addr[0] &= 0xfe;        /* clear multicast bit */
 821         addr[0] |= 0x02;        /* set local assignment bit (IEEE802) */
 822 }
 823
 824 /* Convert an IP address to a string */
 825 void ip_to_string(struct in_addr x, char *s);
 826
 827 /* Convert a string to ip address */
 828 struct in_addr string_to_ip(const char *s);
 829
 830 /* Convert a VLAN id to a string */
 831 void vlan_to_string(ushort x, char *s);
 832
 833 /* Convert a string to a vlan id */
 834 ushort string_to_vlan(const char *s);
 835
 836 /* read a VLAN id from an environment variable */
 837 ushort env_get_vlan(char *);
 838
 839 /* copy a filename (allow for "..." notation, limit length) */
 840 void copy_filename(char *dst, const char *src, int size);
 841
 842 /* get a random source port */
 843 unsigned int random_port(void);
 844
 845 /**
 846  * update_tftp - Update firmware over TFTP (via DFU)
 847  *
 848  * This function updates board's firmware via TFTP
 849  *
 850  * @param addr - memory address where data is stored
 851  * @param interface - the DFU medium name - e.g. "mmc"
 852  * @param devstring - the DFU medium number - e.g. "1"
 853  *
 854  * @return - 0 on success, other value on failure
 855  */
 856 int update_tftp(ulong addr, char *interface, char *devstring);
 857
 858 /**********************************************************************/
 859
 860 #endif /* __NET_H__ */