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