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 #if defined(CONFIG_8xx)
  16 #include <commproc.h>
  17 #endif  /* CONFIG_8xx */
  18
  19 #include <asm/cache.h>
  20 #include <asm/byteorder.h>      /* for nton* / ntoh* stuff */
  21
  22 #define DEBUG_LL_STATE 0        /* Link local state machine changes */
  23 #define DEBUG_DEV_PKT 0         /* Packets or info directed to the device */
  24 #define DEBUG_NET_PKT 0         /* Packets on info on the network at large */
  25 #define DEBUG_INT_STATE 0       /* Internal network state changes */
  26
  27 /*
  28  *      The number of receive packet buffers, and the required packet buffer
  29  *      alignment in memory.
  30  *
  31  */
  32
  33 #ifdef CONFIG_SYS_RX_ETH_BUFFER
  34 # define PKTBUFSRX      CONFIG_SYS_RX_ETH_BUFFER
  35 #else
  36 # define PKTBUFSRX      4
  37 #endif
  38
  39 #define PKTALIGN        ARCH_DMA_MINALIGN
  40
  41 /* IPv4 addresses are always 32 bits in size */
  42 struct in_addr {
  43         __be32 s_addr;
  44 };
  45
  46 /**
  47  * An incoming packet handler.
  48  * @param pkt    pointer to the application packet
  49  * @param dport  destination UDP port
  50  * @param sip    source IP address
  51  * @param sport  source UDP port
  52  * @param len    packet length
  53  */
  54 typedef void rxhand_f(uchar *pkt, unsigned dport,
  55                       struct in_addr sip, unsigned sport,
  56                       unsigned len);
  57
  58 /**
  59  * An incoming ICMP packet handler.
  60  * @param type  ICMP type
  61  * @param code  ICMP code
  62  * @param dport destination UDP port
  63  * @param sip   source IP address
  64  * @param sport source UDP port
  65  * @param pkt   pointer to the ICMP packet data
  66  * @param len   packet length
  67  */
  68 typedef void rxhand_icmp_f(unsigned type, unsigned code, unsigned dport,
  69                 struct in_addr sip, unsigned sport, uchar *pkt, unsigned len);
  70
  71 /*
  72  *      A timeout handler.  Called after time interval has expired.
  73  */
  74 typedef void    thand_f(void);
  75
  76 enum eth_state_t {
  77         ETH_STATE_INIT,
  78         ETH_STATE_PASSIVE,
  79         ETH_STATE_ACTIVE
  80 };
  81
  82 #ifdef CONFIG_DM_ETH
  83 /**
  84  * struct eth_pdata - Platform data for Ethernet MAC controllers
  85  *
  86  * @iobase: The base address of the hardware registers
  87  * @enetaddr: The Ethernet MAC address that is loaded from EEPROM or env
  88  */
  89 struct eth_pdata {
  90         phys_addr_t iobase;
  91         unsigned char enetaddr[6];
  92 };
  93
  94 /**
  95  * struct eth_ops - functions of Ethernet MAC controllers
  96  *
  97  * start: Prepare the hardware to send and receive packets
  98  * send: Send the bytes passed in "packet" as a packet on the wire
  99  * recv: Check if the hardware received a packet. If so, set the pointer to the
 100  *       packet buffer in the packetp parameter. If not, return an error or 0 to
 101  *       indicate that the hardware receive FIFO is empty. If 0 is returned, the
 102  *       network stack will not process the empty packet, but free_pkt() will be
 103  *       called if supplied
 104  * free_pkt: Give the driver an opportunity to manage its packet buffer memory
 105  *           when the network stack is finished processing it. This will only be
 106  *           called when no error was returned from recv - optional
 107  * stop: Stop the hardware from looking for packets - may be called even if
 108  *       state == PASSIVE
 109  * mcast: Join or leave a multicast group (for TFTP) - optional
 110  * write_hwaddr: Write a MAC address to the hardware (used to pass it to Linux
 111  *               on some platforms like ARM). This function expects the
 112  *               eth_pdata::enetaddr field to be populated - optional
 113  * read_rom_hwaddr: Some devices have a backup of the MAC address stored in a
 114  *                  ROM on the board. This is how the driver should expose it
 115  *                  to the network stack. This function should fill in the
 116  *                  eth_pdata::enetaddr field - optional
 117  */
 118 struct eth_ops {
 119         int (*start)(struct udevice *dev);
 120         int (*send)(struct udevice *dev, void *packet, int length);
 121         int (*recv)(struct udevice *dev, uchar **packetp);
 122         int (*free_pkt)(struct udevice *dev, uchar *packet, int length);
 123         void (*stop)(struct udevice *dev);
 124 #ifdef CONFIG_MCAST_TFTP
 125         int (*mcast)(struct udevice *dev, const u8 *enetaddr, int join);
 126 #endif
 127         int (*write_hwaddr)(struct udevice *dev);
 128         int (*read_rom_hwaddr)(struct udevice *dev);
 129 };
 130
 131 #define eth_get_ops(dev) ((struct eth_ops *)(dev)->driver->ops)
 132
 133 struct udevice *eth_get_dev(void); /* get the current device */
 134 /*
 135  * The devname can be either an exact name given by the driver or device tree
 136  * or it can be an alias of the form "eth%d"
 137  */
 138 struct udevice *eth_get_dev_by_name(const char *devname);
 139 unsigned char *eth_get_ethaddr(void); /* get the current device MAC */
 140 /* Used only when NetConsole is enabled */
 141 int eth_init_state_only(void); /* Set active state */
 142 void eth_halt_state_only(void); /* Set passive state */
 143 #endif
 144
 145 #ifndef CONFIG_DM_ETH
 146 struct eth_device {
 147         char name[16];
 148         unsigned char enetaddr[6];
 149         phys_addr_t iobase;
 150         int state;
 151
 152         int (*init)(struct eth_device *, bd_t *);
 153         int (*send)(struct eth_device *, void *packet, int length);
 154         int (*recv)(struct eth_device *);
 155         void (*halt)(struct eth_device *);
 156 #ifdef CONFIG_MCAST_TFTP
 157         int (*mcast)(struct eth_device *, const u8 *enetaddr, u8 set);
 158 #endif
 159         int (*write_hwaddr)(struct eth_device *);
 160         struct eth_device *next;
 161         int index;
 162         void *priv;
 163 };
 164
 165 int eth_register(struct eth_device *dev);/* Register network device */
 166 int eth_unregister(struct eth_device *dev);/* Remove network device */
 167
 168 extern struct eth_device *eth_current;
 169
 170 static inline __attribute__((always_inline))
 171 struct eth_device *eth_get_dev(void)
 172 {
 173         return eth_current;
 174 }
 175 struct eth_device *eth_get_dev_by_name(const char *devname);
 176 struct eth_device *eth_get_dev_by_index(int index); /* get dev @ index */
 177
 178 /* get the current device MAC */
 179 static inline unsigned char *eth_get_ethaddr(void)
 180 {
 181         if (eth_current)
 182                 return eth_current->enetaddr;
 183         return NULL;
 184 }
 185
 186 /* Set active state */
 187 static inline __attribute__((always_inline)) int eth_init_state_only(void)
 188 {
 189         eth_get_dev()->state = ETH_STATE_ACTIVE;
 190
 191         return 0;
 192 }
 193 /* Set passive state */
 194 static inline __attribute__((always_inline)) void eth_halt_state_only(void)
 195 {
 196         eth_get_dev()->state = ETH_STATE_PASSIVE;
 197 }
 198
 199 /*
 200  * Set the hardware address for an ethernet interface based on 'eth%daddr'
 201  * environment variable (or just 'ethaddr' if eth_number is 0).
 202  * Args:
 203  *      base_name - base name for device (normally "eth")
 204  *      eth_number - value of %d (0 for first device of this type)
 205  * Returns:
 206  *      0 is success, non-zero is error status from driver.
 207  */
 208 int eth_write_hwaddr(struct eth_device *dev, const char *base_name,
 209                      int eth_number);
 210
 211 int usb_eth_initialize(bd_t *bi);
 212 #endif
 213
 214 int eth_initialize(void);               /* Initialize network subsystem */
 215 void eth_try_another(int first_restart);        /* Change the device */
 216 void eth_set_current(void);             /* set nterface to ethcur var */
 217
 218 int eth_get_dev_index(void);            /* get the device index */
 219 void eth_parse_enetaddr(const char *addr, uchar *enetaddr);
 220 int eth_getenv_enetaddr(char *name, uchar *enetaddr);
 221 int eth_setenv_enetaddr(char *name, const uchar *enetaddr);
 222
 223 /*
 224  * Get the hardware address for an ethernet interface .
 225  * Args:
 226  *      base_name - base name for device (normally "eth")
 227  *      index - device index number (0 for first)
 228  *      enetaddr - returns 6 byte hardware address
 229  * Returns:
 230  *      Return true if the address is valid.
 231  */
 232 int eth_getenv_enetaddr_by_index(const char *base_name, int index,
 233                                  uchar *enetaddr);
 234
 235 int eth_init(void);                     /* Initialize the device */
 236 int eth_send(void *packet, int length);    /* Send a packet */
 237
 238 #ifdef CONFIG_API
 239 int eth_receive(void *packet, int length); /* Receive a packet*/
 240 extern void (*push_packet)(void *packet, int length);
 241 #endif
 242 int eth_rx(void);                       /* Check for received packets */
 243 void eth_halt(void);                    /* stop SCC */
 244 const char *eth_get_name(void);         /* get name of current device */
 245
 246 #ifdef CONFIG_MCAST_TFTP
 247 int eth_mcast_join(struct in_addr mcast_addr, int join);
 248 u32 ether_crc(size_t len, unsigned char const *p);
 249 #endif
 250
 251
 252 /**********************************************************************/
 253 /*
 254  *      Protocol headers.
 255  */
 256
 257 /*
 258  *      Ethernet header
 259  */
 260
 261 struct ethernet_hdr {
 262         uchar           et_dest[6];     /* Destination node             */
 263         uchar           et_src[6];      /* Source node                  */
 264         ushort          et_protlen;     /* Protocol or length           */
 265 };
 266
 267 /* Ethernet header size */
 268 #define ETHER_HDR_SIZE  (sizeof(struct ethernet_hdr))
 269
 270 #define ETH_FCS_LEN     4               /* Octets in the FCS            */
 271
 272 struct e802_hdr {
 273         uchar           et_dest[6];     /* Destination node             */
 274         uchar           et_src[6];      /* Source node                  */
 275         ushort          et_protlen;     /* Protocol or length           */
 276         uchar           et_dsap;        /* 802 DSAP                     */
 277         uchar           et_ssap;        /* 802 SSAP                     */
 278         uchar           et_ctl;         /* 802 control                  */
 279         uchar           et_snap1;       /* SNAP                         */
 280         uchar           et_snap2;
 281         uchar           et_snap3;
 282         ushort          et_prot;        /* 802 protocol                 */
 283 };
 284
 285 /* 802 + SNAP + ethernet header size */
 286 #define E802_HDR_SIZE   (sizeof(struct e802_hdr))
 287
 288 /*
 289  *      Virtual LAN Ethernet header
 290  */
 291 struct vlan_ethernet_hdr {
 292         uchar           vet_dest[6];    /* Destination node             */
 293         uchar           vet_src[6];     /* Source node                  */
 294         ushort          vet_vlan_type;  /* PROT_VLAN                    */
 295         ushort          vet_tag;        /* TAG of VLAN                  */
 296         ushort          vet_type;       /* protocol type                */
 297 };
 298
 299 /* VLAN Ethernet header size */
 300 #define VLAN_ETHER_HDR_SIZE     (sizeof(struct vlan_ethernet_hdr))
 301
 302 #define PROT_IP         0x0800          /* IP protocol                  */
 303 #define PROT_ARP        0x0806          /* IP ARP protocol              */
 304 #define PROT_RARP       0x8035          /* IP ARP protocol              */
 305 #define PROT_VLAN       0x8100          /* IEEE 802.1q protocol         */
 306
 307 #define IPPROTO_ICMP     1      /* Internet Control Message Protocol    */
 308 #define IPPROTO_UDP     17      /* User Datagram Protocol               */
 309
 310 /*
 311  *      Internet Protocol (IP) header.
 312  */
 313 struct ip_hdr {
 314         uchar           ip_hl_v;        /* header length and version    */
 315         uchar           ip_tos;         /* type of service              */
 316         ushort          ip_len;         /* total length                 */
 317         ushort          ip_id;          /* identification               */
 318         ushort          ip_off;         /* fragment offset field        */
 319         uchar           ip_ttl;         /* time to live                 */
 320         uchar           ip_p;           /* protocol                     */
 321         ushort          ip_sum;         /* checksum                     */
 322         struct in_addr  ip_src;         /* Source IP address            */
 323         struct in_addr  ip_dst;         /* Destination IP address       */
 324 };
 325
 326 #define IP_OFFS         0x1fff /* ip offset *= 8 */
 327 #define IP_FLAGS        0xe000 /* first 3 bits */
 328 #define IP_FLAGS_RES    0x8000 /* reserved */
 329 #define IP_FLAGS_DFRAG  0x4000 /* don't fragments */
 330 #define IP_FLAGS_MFRAG  0x2000 /* more fragments */
 331
 332 #define IP_HDR_SIZE             (sizeof(struct ip_hdr))
 333
 334 /*
 335  *      Internet Protocol (IP) + UDP header.
 336  */
 337 struct ip_udp_hdr {
 338         uchar           ip_hl_v;        /* header length and version    */
 339         uchar           ip_tos;         /* type of service              */
 340         ushort          ip_len;         /* total length                 */
 341         ushort          ip_id;          /* identification               */
 342         ushort          ip_off;         /* fragment offset field        */
 343         uchar           ip_ttl;         /* time to live                 */
 344         uchar           ip_p;           /* protocol                     */
 345         ushort          ip_sum;         /* checksum                     */
 346         struct in_addr  ip_src;         /* Source IP address            */
 347         struct in_addr  ip_dst;         /* Destination IP address       */
 348         ushort          udp_src;        /* UDP source port              */
 349         ushort          udp_dst;        /* UDP destination port         */
 350         ushort          udp_len;        /* Length of UDP packet         */
 351         ushort          udp_xsum;       /* Checksum                     */
 352 };
 353
 354 #define IP_UDP_HDR_SIZE         (sizeof(struct ip_udp_hdr))
 355 #define UDP_HDR_SIZE            (IP_UDP_HDR_SIZE - IP_HDR_SIZE)
 356
 357 /*
 358  *      Address Resolution Protocol (ARP) header.
 359  */
 360 struct arp_hdr {
 361         ushort          ar_hrd;         /* Format of hardware address   */
 362 #   define ARP_ETHER        1           /* Ethernet  hardware address   */
 363         ushort          ar_pro;         /* Format of protocol address   */
 364         uchar           ar_hln;         /* Length of hardware address   */
 365 #   define ARP_HLEN     6
 366         uchar           ar_pln;         /* Length of protocol address   */
 367 #   define ARP_PLEN     4
 368         ushort          ar_op;          /* Operation                    */
 369 #   define ARPOP_REQUEST    1           /* Request  to resolve  address */
 370 #   define ARPOP_REPLY      2           /* Response to previous request */
 371
 372 #   define RARPOP_REQUEST   3           /* Request  to resolve  address */
 373 #   define RARPOP_REPLY     4           /* Response to previous request */
 374
 375         /*
 376          * The remaining fields are variable in size, according to
 377          * the sizes above, and are defined as appropriate for
 378          * specific hardware/protocol combinations.
 379          */
 380         uchar           ar_data[0];
 381 #define ar_sha          ar_data[0]
 382 #define ar_spa          ar_data[ARP_HLEN]
 383 #define ar_tha          ar_data[ARP_HLEN + ARP_PLEN]
 384 #define ar_tpa          ar_data[ARP_HLEN + ARP_PLEN + ARP_HLEN]
 385 #if 0
 386         uchar           ar_sha[];       /* Sender hardware address      */
 387         uchar           ar_spa[];       /* Sender protocol address      */
 388         uchar           ar_tha[];       /* Target hardware address      */
 389         uchar           ar_tpa[];       /* Target protocol address      */
 390 #endif /* 0 */
 391 };
 392
 393 #define ARP_HDR_SIZE    (8+20)          /* Size assuming ethernet       */
 394
 395 /*
 396  * ICMP stuff (just enough to handle (host) redirect messages)
 397  */
 398 #define ICMP_ECHO_REPLY         0       /* Echo reply                   */
 399 #define ICMP_NOT_REACH          3       /* Detination unreachable       */
 400 #define ICMP_REDIRECT           5       /* Redirect (change route)      */
 401 #define ICMP_ECHO_REQUEST       8       /* Echo request                 */
 402
 403 /* Codes for REDIRECT. */
 404 #define ICMP_REDIR_NET          0       /* Redirect Net                 */
 405 #define ICMP_REDIR_HOST         1       /* Redirect Host                */
 406
 407 /* Codes for NOT_REACH */
 408 #define ICMP_NOT_REACH_PORT     3       /* Port unreachable             */
 409
 410 struct icmp_hdr {
 411         uchar           type;
 412         uchar           code;
 413         ushort          checksum;
 414         union {
 415                 struct {
 416                         ushort  id;
 417                         ushort  sequence;
 418                 } echo;
 419                 u32     gateway;
 420                 struct {
 421                         ushort  unused;
 422                         ushort  mtu;
 423                 } frag;
 424                 uchar data[0];
 425         } un;
 426 };
 427
 428 #define ICMP_HDR_SIZE           (sizeof(struct icmp_hdr))
 429 #define IP_ICMP_HDR_SIZE        (IP_HDR_SIZE + ICMP_HDR_SIZE)
 430
 431 /*
 432  * Maximum packet size; used to allocate packet storage.
 433  * TFTP packets can be 524 bytes + IP header + ethernet header.
 434  * Lets be conservative, and go for 38 * 16.  (Must also be
 435  * a multiple of 32 bytes).
 436  */
 437 /*
 438  * AS.HARNOIS : Better to set PKTSIZE to maximum size because
 439  * traffic type is not always controlled
 440  * maximum packet size =  1518
 441  * maximum packet size and multiple of 32 bytes =  1536
 442  */
 443 #define PKTSIZE                 1518
 444 #define PKTSIZE_ALIGN           1536
 445 /*#define PKTSIZE               608*/
 446
 447 /*
 448  * Maximum receive ring size; that is, the number of packets
 449  * we can buffer before overflow happens. Basically, this just
 450  * needs to be enough to prevent a packet being discarded while
 451  * we are processing the previous one.
 452  */
 453 #define RINGSZ          4
 454 #define RINGSZ_LOG2     2
 455
 456 /**********************************************************************/
 457 /*
 458  *      Globals.
 459  *
 460  * Note:
 461  *
 462  * All variables of type struct in_addr are stored in NETWORK byte order
 463  * (big endian).
 464  */
 465
 466 /* net.c */
 467 /** BOOTP EXTENTIONS **/
 468 extern struct in_addr net_gateway;      /* Our gateway IP address */
 469 extern struct in_addr net_netmask;      /* Our subnet mask (0 = unknown) */
 470 /* Our Domain Name Server (0 = unknown) */
 471 extern struct in_addr net_dns_server;
 472 #if defined(CONFIG_BOOTP_DNS2)
 473 /* Our 2nd Domain Name Server (0 = unknown) */
 474 extern struct in_addr net_dns_server2;
 475 #endif
 476 extern char     net_nis_domain[32];     /* Our IS domain */
 477 extern char     net_hostname[32];       /* Our hostname */
 478 extern char     net_root_path[64];      /* Our root path */
 479 /** END OF BOOTP EXTENTIONS **/
 480 extern u8               net_ethaddr[6];         /* Our ethernet address */
 481 extern u8               net_server_ethaddr[6];  /* Boot server enet address */
 482 extern struct in_addr   net_ip;         /* Our    IP addr (0 = unknown) */
 483 extern struct in_addr   net_server_ip;  /* Server IP addr (0 = unknown) */
 484 extern uchar            *net_tx_packet;         /* THE transmit packet */
 485 extern uchar            *net_rx_packets[PKTBUFSRX]; /* Receive packets */
 486 extern uchar            *net_rx_packet;         /* Current receive packet */
 487 extern int              net_rx_packet_len;      /* Current rx packet length */
 488 extern const u8         net_bcast_ethaddr[6];   /* Ethernet broadcast address */
 489 extern const u8         net_null_ethaddr[6];
 490
 491 #define VLAN_NONE       4095                    /* untagged */
 492 #define VLAN_IDMASK     0x0fff                  /* mask of valid vlan id */
 493 extern ushort           net_our_vlan;           /* Our VLAN */
 494 extern ushort           net_native_vlan;        /* Our Native VLAN */
 495
 496 extern int              net_restart_wrap;       /* Tried all network devices */
 497
 498 enum proto_t {
 499         BOOTP, RARP, ARP, TFTPGET, DHCP, PING, DNS, NFS, CDP, NETCONS, SNTP,
 500         TFTPSRV, TFTPPUT, LINKLOCAL
 501 };
 502
 503 extern char     net_boot_file_name[128];/* Boot File name */
 504 /* The actual transferred size of the bootfile (in bytes) */
 505 extern u32      net_boot_file_size;
 506 /* Boot file size in blocks as reported by the DHCP server */
 507 extern u32      net_boot_file_expected_size_in_blocks;
 508
 509 #if defined(CONFIG_CMD_DNS)
 510 extern char *net_dns_resolve;           /* The host to resolve  */
 511 extern char *net_dns_env_var;           /* the env var to put the ip into */
 512 #endif
 513
 514 #if defined(CONFIG_CMD_PING)
 515 extern struct in_addr net_ping_ip;      /* the ip address to ping */
 516 #endif
 517
 518 #if defined(CONFIG_CMD_CDP)
 519 /* when CDP completes these hold the return values */
 520 extern ushort cdp_native_vlan;          /* CDP returned native VLAN */
 521 extern ushort cdp_appliance_vlan;       /* CDP returned appliance VLAN */
 522
 523 /*
 524  * Check for a CDP packet by examining the received MAC address field
 525  */
 526 static inline int is_cdp_packet(const uchar *ethaddr)
 527 {
 528         extern const u8 net_cdp_ethaddr[6];
 529
 530         return memcmp(ethaddr, net_cdp_ethaddr, 6) == 0;
 531 }
 532 #endif
 533
 534 #if defined(CONFIG_CMD_SNTP)
 535 extern struct in_addr   net_ntp_server;         /* the ip address to NTP */
 536 extern int net_ntp_time_offset;                 /* offset time from UTC */
 537 #endif
 538
 539 #if defined(CONFIG_MCAST_TFTP)
 540 extern struct in_addr net_mcast_addr;
 541 #endif
 542
 543 /* Initialize the network adapter */
 544 void net_init(void);
 545 int net_loop(enum proto_t);
 546
 547 /* Load failed.  Start again. */
 548 int net_start_again(void);
 549
 550 /* Get size of the ethernet header when we send */
 551 int net_eth_hdr_size(void);
 552
 553 /* Set ethernet header; returns the size of the header */
 554 int net_set_ether(uchar *xet, const uchar *dest_ethaddr, uint prot);
 555 int net_update_ether(struct ethernet_hdr *et, uchar *addr, uint prot);
 556
 557 /* Set IP header */
 558 void net_set_ip_header(uchar *pkt, struct in_addr dest, struct in_addr source);
 559 void net_set_udp_header(uchar *pkt, struct in_addr dest, int dport,
 560                                 int sport, int len);
 561
 562 /**
 563  * compute_ip_checksum() - Compute IP checksum
 564  *
 565  * @addr:       Address to check (must be 16-bit aligned)
 566  * @nbytes:     Number of bytes to check (normally a multiple of 2)
 567  * @return 16-bit IP checksum
 568  */
 569 unsigned compute_ip_checksum(const void *addr, unsigned nbytes);
 570
 571 /**
 572  * add_ip_checksums() - add two IP checksums
 573  *
 574  * @offset:     Offset of first sum (if odd we do a byte-swap)
 575  * @sum:        First checksum
 576  * @new_sum:    New checksum to add
 577  * @return updated 16-bit IP checksum
 578  */
 579 unsigned add_ip_checksums(unsigned offset, unsigned sum, unsigned new_sum);
 580
 581 /**
 582  * ip_checksum_ok() - check if a checksum is correct
 583  *
 584  * This works by making sure the checksum sums to 0
 585  *
 586  * @addr:       Address to check (must be 16-bit aligned)
 587  * @nbytes:     Number of bytes to check (normally a multiple of 2)
 588  * @return true if the checksum matches, false if not
 589  */
 590 int ip_checksum_ok(const void *addr, unsigned nbytes);
 591
 592 /* Callbacks */
 593 rxhand_f *net_get_udp_handler(void);    /* Get UDP RX packet handler */
 594 void net_set_udp_handler(rxhand_f *);   /* Set UDP RX packet handler */
 595 rxhand_f *net_get_arp_handler(void);    /* Get ARP RX packet handler */
 596 void net_set_arp_handler(rxhand_f *);   /* Set ARP RX packet handler */
 597 void net_set_icmp_handler(rxhand_icmp_f *f); /* Set ICMP RX handler */
 598 void net_set_timeout_handler(ulong, thand_f *);/* Set timeout handler */
 599
 600 /* Network loop state */
 601 enum net_loop_state {
 602         NETLOOP_CONTINUE,
 603         NETLOOP_RESTART,
 604         NETLOOP_SUCCESS,
 605         NETLOOP_FAIL
 606 };
 607 extern enum net_loop_state net_state;
 608
 609 static inline void net_set_state(enum net_loop_state state)
 610 {
 611         debug_cond(DEBUG_INT_STATE, "--- NetState set to %d\n", state);
 612         net_state = state;
 613 }
 614
 615 /* Transmit a packet */
 616 static inline void net_send_packet(uchar *pkt, int len)
 617 {
 618         /* Currently no way to return errors from eth_send() */
 619         (void) eth_send(pkt, len);
 620 }
 621
 622 /*
 623  * Transmit "net_tx_packet" as UDP packet, performing ARP request if needed
 624  *  (ether will be populated)
 625  *
 626  * @param ether Raw packet buffer
 627  * @param dest IP address to send the datagram to
 628  * @param dport Destination UDP port
 629  * @param sport Source UDP port
 630  * @param payload_len Length of data after the UDP header
 631  */
 632 int net_send_udp_packet(uchar *ether, struct in_addr dest, int dport,
 633                         int sport, int payload_len);
 634
 635 /* Processes a received packet */
 636 void net_process_received_packet(uchar *in_packet, int len);
 637
 638 #ifdef CONFIG_NETCONSOLE
 639 void nc_start(void);
 640 int nc_input_packet(uchar *pkt, struct in_addr src_ip, unsigned dest_port,
 641         unsigned src_port, unsigned len);
 642 #endif
 643
 644 static inline __attribute__((always_inline)) int eth_is_on_demand_init(void)
 645 {
 646 #ifdef CONFIG_NETCONSOLE
 647         extern enum proto_t net_loop_last_protocol;
 648
 649         return net_loop_last_protocol != NETCONS;
 650 #else
 651         return 1;
 652 #endif
 653 }
 654
 655 static inline void eth_set_last_protocol(int protocol)
 656 {
 657 #ifdef CONFIG_NETCONSOLE
 658         extern enum proto_t net_loop_last_protocol;
 659
 660         net_loop_last_protocol = protocol;
 661 #endif
 662 }
 663
 664 /*
 665  * Check if autoload is enabled. If so, use either NFS or TFTP to download
 666  * the boot file.
 667  */
 668 void net_auto_load(void);
 669
 670 /*
 671  * The following functions are a bit ugly, but necessary to deal with
 672  * alignment restrictions on ARM.
 673  *
 674  * We're using inline functions, which had the smallest memory
 675  * footprint in our tests.
 676  */
 677 /* return IP *in network byteorder* */
 678 static inline struct in_addr net_read_ip(void *from)
 679 {
 680         struct in_addr ip;
 681
 682         memcpy((void *)&ip, (void *)from, sizeof(ip));
 683         return ip;
 684 }
 685
 686 /* return ulong *in network byteorder* */
 687 static inline u32 net_read_u32(u32 *from)
 688 {
 689         u32 l;
 690
 691         memcpy((void *)&l, (void *)from, sizeof(l));
 692         return l;
 693 }
 694
 695 /* write IP *in network byteorder* */
 696 static inline void net_write_ip(void *to, struct in_addr ip)
 697 {
 698         memcpy(to, (void *)&ip, sizeof(ip));
 699 }
 700
 701 /* copy IP */
 702 static inline void net_copy_ip(void *to, void *from)
 703 {
 704         memcpy((void *)to, from, sizeof(struct in_addr));
 705 }
 706
 707 /* copy ulong */
 708 static inline void net_copy_u32(u32 *to, u32 *from)
 709 {
 710         memcpy((void *)to, (void *)from, sizeof(u32));
 711 }
 712
 713 /**
 714  * is_zero_ethaddr - Determine if give Ethernet address is all zeros.
 715  * @addr: Pointer to a six-byte array containing the Ethernet address
 716  *
 717  * Return true if the address is all zeroes.
 718  */
 719 static inline int is_zero_ethaddr(const u8 *addr)
 720 {
 721         return !(addr[0] | addr[1] | addr[2] | addr[3] | addr[4] | addr[5]);
 722 }
 723
 724 /**
 725  * is_multicast_ethaddr - Determine if the Ethernet address is a multicast.
 726  * @addr: Pointer to a six-byte array containing the Ethernet address
 727  *
 728  * Return true if the address is a multicast address.
 729  * By definition the broadcast address is also a multicast address.
 730  */
 731 static inline int is_multicast_ethaddr(const u8 *addr)
 732 {
 733         return 0x01 & addr[0];
 734 }
 735
 736 /*
 737  * is_broadcast_ethaddr - Determine if the Ethernet address is broadcast
 738  * @addr: Pointer to a six-byte array containing the Ethernet address
 739  *
 740  * Return true if the address is the broadcast address.
 741  */
 742 static inline int is_broadcast_ethaddr(const u8 *addr)
 743 {
 744         return (addr[0] & addr[1] & addr[2] & addr[3] & addr[4] & addr[5]) ==
 745                 0xff;
 746 }
 747
 748 /*
 749  * is_valid_ethaddr - Determine if the given Ethernet address is valid
 750  * @addr: Pointer to a six-byte array containing the Ethernet address
 751  *
 752  * Check that the Ethernet address (MAC) is not 00:00:00:00:00:00, is not
 753  * a multicast address, and is not FF:FF:FF:FF:FF:FF.
 754  *
 755  * Return true if the address is valid.
 756  */
 757 static inline int is_valid_ethaddr(const u8 *addr)
 758 {
 759         /* FF:FF:FF:FF:FF:FF is a multicast address so we don't need to
 760          * explicitly check for it here. */
 761         return !is_multicast_ethaddr(addr) && !is_zero_ethaddr(addr);
 762 }
 763
 764 /**
 765  * net_random_ethaddr - Generate software assigned random Ethernet address
 766  * @addr: Pointer to a six-byte array containing the Ethernet address
 767  *
 768  * Generate a random Ethernet address (MAC) that is not multicast
 769  * and has the local assigned bit set.
 770  */
 771 static inline void net_random_ethaddr(uchar *addr)
 772 {
 773         int i;
 774         unsigned int seed = get_timer(0);
 775
 776         for (i = 0; i < 6; i++)
 777                 addr[i] = rand_r(&seed);
 778
 779         addr[0] &= 0xfe;        /* clear multicast bit */
 780         addr[0] |= 0x02;        /* set local assignment bit (IEEE802) */
 781 }
 782
 783 /* Convert an IP address to a string */
 784 void ip_to_string(struct in_addr x, char *s);
 785
 786 /* Convert a string to ip address */
 787 struct in_addr string_to_ip(const char *s);
 788
 789 /* Convert a VLAN id to a string */
 790 void vlan_to_string(ushort x, char *s);
 791
 792 /* Convert a string to a vlan id */
 793 ushort string_to_vlan(const char *s);
 794
 795 /* read a VLAN id from an environment variable */
 796 ushort getenv_vlan(char *);
 797
 798 /* copy a filename (allow for "..." notation, limit length) */
 799 void copy_filename(char *dst, const char *src, int size);
 800
 801 /* get a random source port */
 802 unsigned int random_port(void);
 803
 804 /* Update U-Boot over TFTP */
 805 int update_tftp(ulong addr);
 806
 807 /**********************************************************************/
 808
 809 #endif /* __NET_H__ */