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  * @phy_interface: PHY interface to use - see PHY_INTERFACE_MODE_...
  89  * @max_speed: Maximum speed of Ethernet connection supported by MAC
  90  */
  91 struct eth_pdata {
  92         phys_addr_t iobase;
  93         unsigned char enetaddr[6];
  94         int phy_interface;
  95         int max_speed;
  96 };
  97
  98 enum eth_recv_flags {
  99         /*
 100          * Check hardware device for new packets (otherwise only return those
 101          * which are already in the memory buffer ready to process)
 102          */
 103         ETH_RECV_CHECK_DEVICE           = 1 << 0,
 104 };
 105
 106 /**
 107  * struct eth_ops - functions of Ethernet MAC controllers
 108  *
 109  * start: Prepare the hardware to send and receive packets
 110  * send: Send the bytes passed in "packet" as a packet on the wire
 111  * recv: Check if the hardware received a packet. If so, set the pointer to the
 112  *       packet buffer in the packetp parameter. If not, return an error or 0 to
 113  *       indicate that the hardware receive FIFO is empty. If 0 is returned, the
 114  *       network stack will not process the empty packet, but free_pkt() will be
 115  *       called if supplied
 116  * free_pkt: Give the driver an opportunity to manage its packet buffer memory
 117  *           when the network stack is finished processing it. This will only be
 118  *           called when no error was returned from recv - optional
 119  * stop: Stop the hardware from looking for packets - may be called even if
 120  *       state == PASSIVE
 121  * mcast: Join or leave a multicast group (for TFTP) - optional
 122  * write_hwaddr: Write a MAC address to the hardware (used to pass it to Linux
 123  *               on some platforms like ARM). This function expects the
 124  *               eth_pdata::enetaddr field to be populated. The method can
 125  *               return -ENOSYS to indicate that this is not implemented for
 126                  this hardware - optional.
 127  * read_rom_hwaddr: Some devices have a backup of the MAC address stored in a
 128  *                  ROM on the board. This is how the driver should expose it
 129  *                  to the network stack. This function should fill in the
 130  *                  eth_pdata::enetaddr field - optional
 131  */
 132 struct eth_ops {
 133         int (*start)(struct udevice *dev);
 134         int (*send)(struct udevice *dev, void *packet, int length);
 135         int (*recv)(struct udevice *dev, int flags, uchar **packetp);
 136         int (*free_pkt)(struct udevice *dev, uchar *packet, int length);
 137         void (*stop)(struct udevice *dev);
 138 #ifdef CONFIG_MCAST_TFTP
 139         int (*mcast)(struct udevice *dev, const u8 *enetaddr, int join);
 140 #endif
 141         int (*write_hwaddr)(struct udevice *dev);
 142         int (*read_rom_hwaddr)(struct udevice *dev);
 143 };
 144
 145 #define eth_get_ops(dev) ((struct eth_ops *)(dev)->driver->ops)
 146
 147 struct udevice *eth_get_dev(void); /* get the current device */
 148 /*
 149  * The devname can be either an exact name given by the driver or device tree
 150  * or it can be an alias of the form "eth%d"
 151  */
 152 struct udevice *eth_get_dev_by_name(const char *devname);
 153 unsigned char *eth_get_ethaddr(void); /* get the current device MAC */
 154
 155 /* Used only when NetConsole is enabled */
 156 int eth_is_active(struct udevice *dev); /* Test device for active state */
 157 int eth_init_state_only(void); /* Set active state */
 158 void eth_halt_state_only(void); /* Set passive state */
 159 #endif
 160
 161 #ifndef CONFIG_DM_ETH
 162 struct eth_device {
 163         char name[16];
 164         unsigned char enetaddr[6];
 165         phys_addr_t iobase;
 166         int state;
 167
 168         int (*init)(struct eth_device *, bd_t *);
 169         int (*send)(struct eth_device *, void *packet, int length);
 170         int (*recv)(struct eth_device *);
 171         void (*halt)(struct eth_device *);
 172 #ifdef CONFIG_MCAST_TFTP
 173         int (*mcast)(struct eth_device *, const u8 *enetaddr, u8 set);
 174 #endif
 175         int (*write_hwaddr)(struct eth_device *);
 176         struct eth_device *next;
 177         int index;
 178         void *priv;
 179 };
 180
 181 int eth_register(struct eth_device *dev);/* Register network device */
 182 int eth_unregister(struct eth_device *dev);/* Remove network device */
 183
 184 extern struct eth_device *eth_current;
 185
 186 static inline __attribute__((always_inline))
 187 struct eth_device *eth_get_dev(void)
 188 {
 189         return eth_current;
 190 }
 191 struct eth_device *eth_get_dev_by_name(const char *devname);
 192 struct eth_device *eth_get_dev_by_index(int index); /* get dev @ index */
 193
 194 /* get the current device MAC */
 195 static inline unsigned char *eth_get_ethaddr(void)
 196 {
 197         if (eth_current)
 198                 return eth_current->enetaddr;
 199         return NULL;
 200 }
 201
 202 /* Used only when NetConsole is enabled */
 203 int eth_is_active(struct eth_device *dev); /* Test device for active state */
 204 /* Set active state */
 205 static inline __attribute__((always_inline)) int eth_init_state_only(void)
 206 {
 207         eth_get_dev()->state = ETH_STATE_ACTIVE;
 208
 209         return 0;
 210 }
 211 /* Set passive state */
 212 static inline __attribute__((always_inline)) void eth_halt_state_only(void)
 213 {
 214         eth_get_dev()->state = ETH_STATE_PASSIVE;
 215 }
 216
 217 /*
 218  * Set the hardware address for an ethernet interface based on 'eth%daddr'
 219  * environment variable (or just 'ethaddr' if eth_number is 0).
 220  * Args:
 221  *      base_name - base name for device (normally "eth")
 222  *      eth_number - value of %d (0 for first device of this type)
 223  * Returns:
 224  *      0 is success, non-zero is error status from driver.
 225  */
 226 int eth_write_hwaddr(struct eth_device *dev, const char *base_name,
 227                      int eth_number);
 228
 229 int usb_eth_initialize(bd_t *bi);
 230 #endif
 231
 232 int eth_initialize(void);               /* Initialize network subsystem */
 233 void eth_try_another(int first_restart);        /* Change the device */
 234 void eth_set_current(void);             /* set nterface to ethcur var */
 235
 236 int eth_get_dev_index(void);            /* get the device index */
 237 void eth_parse_enetaddr(const char *addr, uchar *enetaddr);
 238 int eth_getenv_enetaddr(const char *name, uchar *enetaddr);
 239 int eth_setenv_enetaddr(const char *name, const uchar *enetaddr);
 240
 241 /*
 242  * Get the hardware address for an ethernet interface .
 243  * Args:
 244  *      base_name - base name for device (normally "eth")
 245  *      index - device index number (0 for first)
 246  *      enetaddr - returns 6 byte hardware address
 247  * Returns:
 248  *      Return true if the address is valid.
 249  */
 250 int eth_getenv_enetaddr_by_index(const char *base_name, int index,
 251                                  uchar *enetaddr);
 252
 253 int eth_init(void);                     /* Initialize the device */
 254 int eth_send(void *packet, int length);    /* Send a packet */
 255
 256 #ifdef CONFIG_API
 257 int eth_receive(void *packet, int length); /* Receive a packet*/
 258 extern void (*push_packet)(void *packet, int length);
 259 #endif
 260 int eth_rx(void);                       /* Check for received packets */
 261 void eth_halt(void);                    /* stop SCC */
 262 const char *eth_get_name(void);         /* get name of current device */
 263
 264 #ifdef CONFIG_MCAST_TFTP
 265 int eth_mcast_join(struct in_addr mcast_addr, int join);
 266 u32 ether_crc(size_t len, unsigned char const *p);
 267 #endif
 268
 269
 270 /**********************************************************************/
 271 /*
 272  *      Protocol headers.
 273  */
 274
 275 /*
 276  *      Ethernet header
 277  */
 278
 279 struct ethernet_hdr {
 280         u8              et_dest[6];     /* Destination node             */
 281         u8              et_src[6];      /* Source node                  */
 282         u16             et_protlen;     /* Protocol or length           */
 283 };
 284
 285 /* Ethernet header size */
 286 #define ETHER_HDR_SIZE  (sizeof(struct ethernet_hdr))
 287
 288 #define ETH_FCS_LEN     4               /* Octets in the FCS            */
 289
 290 struct e802_hdr {
 291         u8              et_dest[6];     /* Destination node             */
 292         u8              et_src[6];      /* Source node                  */
 293         u16             et_protlen;     /* Protocol or length           */
 294         u8              et_dsap;        /* 802 DSAP                     */
 295         u8              et_ssap;        /* 802 SSAP                     */
 296         u8              et_ctl;         /* 802 control                  */
 297         u8              et_snap1;       /* SNAP                         */
 298         u8              et_snap2;
 299         u8              et_snap3;
 300         u16             et_prot;        /* 802 protocol                 */
 301 };
 302
 303 /* 802 + SNAP + ethernet header size */
 304 #define E802_HDR_SIZE   (sizeof(struct e802_hdr))
 305
 306 /*
 307  *      Virtual LAN Ethernet header
 308  */
 309 struct vlan_ethernet_hdr {
 310         u8              vet_dest[6];    /* Destination node             */
 311         u8              vet_src[6];     /* Source node                  */
 312         u16             vet_vlan_type;  /* PROT_VLAN                    */
 313         u16             vet_tag;        /* TAG of VLAN                  */
 314         u16             vet_type;       /* protocol type                */
 315 };
 316
 317 /* VLAN Ethernet header size */
 318 #define VLAN_ETHER_HDR_SIZE     (sizeof(struct vlan_ethernet_hdr))
 319
 320 #define PROT_IP         0x0800          /* IP protocol                  */
 321 #define PROT_ARP        0x0806          /* IP ARP protocol              */
 322 #define PROT_RARP       0x8035          /* IP ARP protocol              */
 323 #define PROT_VLAN       0x8100          /* IEEE 802.1q protocol         */
 324
 325 #define IPPROTO_ICMP     1      /* Internet Control Message Protocol    */
 326 #define IPPROTO_UDP     17      /* User Datagram Protocol               */
 327
 328 /*
 329  *      Internet Protocol (IP) header.
 330  */
 331 struct ip_hdr {
 332         u8              ip_hl_v;        /* header length and version    */
 333         u8              ip_tos;         /* type of service              */
 334         u16             ip_len;         /* total length                 */
 335         u16             ip_id;          /* identification               */
 336         u16             ip_off;         /* fragment offset field        */
 337         u8              ip_ttl;         /* time to live                 */
 338         u8              ip_p;           /* protocol                     */
 339         u16             ip_sum;         /* checksum                     */
 340         struct in_addr  ip_src;         /* Source IP address            */
 341         struct in_addr  ip_dst;         /* Destination IP address       */
 342 };
 343
 344 #define IP_OFFS         0x1fff /* ip offset *= 8 */
 345 #define IP_FLAGS        0xe000 /* first 3 bits */
 346 #define IP_FLAGS_RES    0x8000 /* reserved */
 347 #define IP_FLAGS_DFRAG  0x4000 /* don't fragments */
 348 #define IP_FLAGS_MFRAG  0x2000 /* more fragments */
 349
 350 #define IP_HDR_SIZE             (sizeof(struct ip_hdr))
 351
 352 /*
 353  *      Internet Protocol (IP) + UDP header.
 354  */
 355 struct ip_udp_hdr {
 356         u8              ip_hl_v;        /* header length and version    */
 357         u8              ip_tos;         /* type of service              */
 358         u16             ip_len;         /* total length                 */
 359         u16             ip_id;          /* identification               */
 360         u16             ip_off;         /* fragment offset field        */
 361         u8              ip_ttl;         /* time to live                 */
 362         u8              ip_p;           /* protocol                     */
 363         u16             ip_sum;         /* checksum                     */
 364         struct in_addr  ip_src;         /* Source IP address            */
 365         struct in_addr  ip_dst;         /* Destination IP address       */
 366         u16             udp_src;        /* UDP source port              */
 367         u16             udp_dst;        /* UDP destination port         */
 368         u16             udp_len;        /* Length of UDP packet         */
 369         u16             udp_xsum;       /* Checksum                     */
 370 };
 371
 372 #define IP_UDP_HDR_SIZE         (sizeof(struct ip_udp_hdr))
 373 #define UDP_HDR_SIZE            (IP_UDP_HDR_SIZE - IP_HDR_SIZE)
 374
 375 /*
 376  *      Address Resolution Protocol (ARP) header.
 377  */
 378 struct arp_hdr {
 379         u16             ar_hrd;         /* Format of hardware address   */
 380 #   define ARP_ETHER        1           /* Ethernet  hardware address   */
 381         u16             ar_pro;         /* Format of protocol address   */
 382         u8              ar_hln;         /* Length of hardware address   */
 383 #   define ARP_HLEN     6
 384         u8              ar_pln;         /* Length of protocol address   */
 385 #   define ARP_PLEN     4
 386         u16             ar_op;          /* Operation                    */
 387 #   define ARPOP_REQUEST    1           /* Request  to resolve  address */
 388 #   define ARPOP_REPLY      2           /* Response to previous request */
 389
 390 #   define RARPOP_REQUEST   3           /* Request  to resolve  address */
 391 #   define RARPOP_REPLY     4           /* Response to previous request */
 392
 393         /*
 394          * The remaining fields are variable in size, according to
 395          * the sizes above, and are defined as appropriate for
 396          * specific hardware/protocol combinations.
 397          */
 398         u8              ar_data[0];
 399 #define ar_sha          ar_data[0]
 400 #define ar_spa          ar_data[ARP_HLEN]
 401 #define ar_tha          ar_data[ARP_HLEN + ARP_PLEN]
 402 #define ar_tpa          ar_data[ARP_HLEN + ARP_PLEN + ARP_HLEN]
 403 #if 0
 404         u8              ar_sha[];       /* Sender hardware address      */
 405         u8              ar_spa[];       /* Sender protocol address      */
 406         u8              ar_tha[];       /* Target hardware address      */
 407         u8              ar_tpa[];       /* Target protocol address      */
 408 #endif /* 0 */
 409 };
 410
 411 #define ARP_HDR_SIZE    (8+20)          /* Size assuming ethernet       */
 412
 413 /*
 414  * ICMP stuff (just enough to handle (host) redirect messages)
 415  */
 416 #define ICMP_ECHO_REPLY         0       /* Echo reply                   */
 417 #define ICMP_NOT_REACH          3       /* Detination unreachable       */
 418 #define ICMP_REDIRECT           5       /* Redirect (change route)      */
 419 #define ICMP_ECHO_REQUEST       8       /* Echo request                 */
 420
 421 /* Codes for REDIRECT. */
 422 #define ICMP_REDIR_NET          0       /* Redirect Net                 */
 423 #define ICMP_REDIR_HOST         1       /* Redirect Host                */
 424
 425 /* Codes for NOT_REACH */
 426 #define ICMP_NOT_REACH_PORT     3       /* Port unreachable             */
 427
 428 struct icmp_hdr {
 429         u8              type;
 430         u8              code;
 431         u16             checksum;
 432         union {
 433                 struct {
 434                         u16     id;
 435                         u16     sequence;
 436                 } echo;
 437                 u32     gateway;
 438                 struct {
 439                         u16     unused;
 440                         u16     mtu;
 441                 } frag;
 442                 u8 data[0];
 443         } un;
 444 };
 445
 446 #define ICMP_HDR_SIZE           (sizeof(struct icmp_hdr))
 447 #define IP_ICMP_HDR_SIZE        (IP_HDR_SIZE + ICMP_HDR_SIZE)
 448
 449 /*
 450  * Maximum packet size; used to allocate packet storage.
 451  * TFTP packets can be 524 bytes + IP header + ethernet header.
 452  * Lets be conservative, and go for 38 * 16.  (Must also be
 453  * a multiple of 32 bytes).
 454  */
 455 /*
 456  * AS.HARNOIS : Better to set PKTSIZE to maximum size because
 457  * traffic type is not always controlled
 458  * maximum packet size =  1518
 459  * maximum packet size and multiple of 32 bytes =  1536
 460  */
 461 #define PKTSIZE                 1518
 462 #define PKTSIZE_ALIGN           1536
 463 /*#define PKTSIZE               608*/
 464
 465 /*
 466  * Maximum receive ring size; that is, the number of packets
 467  * we can buffer before overflow happens. Basically, this just
 468  * needs to be enough to prevent a packet being discarded while
 469  * we are processing the previous one.
 470  */
 471 #define RINGSZ          4
 472 #define RINGSZ_LOG2     2
 473
 474 /**********************************************************************/
 475 /*
 476  *      Globals.
 477  *
 478  * Note:
 479  *
 480  * All variables of type struct in_addr are stored in NETWORK byte order
 481  * (big endian).
 482  */
 483
 484 /* net.c */
 485 /** BOOTP EXTENTIONS **/
 486 extern struct in_addr net_gateway;      /* Our gateway IP address */
 487 extern struct in_addr net_netmask;      /* Our subnet mask (0 = unknown) */
 488 /* Our Domain Name Server (0 = unknown) */
 489 extern struct in_addr net_dns_server;
 490 #if defined(CONFIG_BOOTP_DNS2)
 491 /* Our 2nd Domain Name Server (0 = unknown) */
 492 extern struct in_addr net_dns_server2;
 493 #endif
 494 extern char     net_nis_domain[32];     /* Our IS domain */
 495 extern char     net_hostname[32];       /* Our hostname */
 496 extern char     net_root_path[64];      /* Our root path */
 497 /** END OF BOOTP EXTENTIONS **/
 498 extern u8               net_ethaddr[6];         /* Our ethernet address */
 499 extern u8               net_server_ethaddr[6];  /* Boot server enet address */
 500 extern struct in_addr   net_ip;         /* Our    IP addr (0 = unknown) */
 501 extern struct in_addr   net_server_ip;  /* Server IP addr (0 = unknown) */
 502 extern uchar            *net_tx_packet;         /* THE transmit packet */
 503 extern uchar            *net_rx_packets[PKTBUFSRX]; /* Receive packets */
 504 extern uchar            *net_rx_packet;         /* Current receive packet */
 505 extern int              net_rx_packet_len;      /* Current rx packet length */
 506 extern const u8         net_bcast_ethaddr[6];   /* Ethernet broadcast address */
 507 extern const u8         net_null_ethaddr[6];
 508
 509 #define VLAN_NONE       4095                    /* untagged */
 510 #define VLAN_IDMASK     0x0fff                  /* mask of valid vlan id */
 511 extern ushort           net_our_vlan;           /* Our VLAN */
 512 extern ushort           net_native_vlan;        /* Our Native VLAN */
 513
 514 extern int              net_restart_wrap;       /* Tried all network devices */
 515
 516 enum proto_t {
 517         BOOTP, RARP, ARP, TFTPGET, DHCP, PING, DNS, NFS, CDP, NETCONS, SNTP,
 518         TFTPSRV, TFTPPUT, LINKLOCAL
 519 };
 520
 521 extern char     net_boot_file_name[1024];/* Boot File name */
 522 /* The actual transferred size of the bootfile (in bytes) */
 523 extern u32      net_boot_file_size;
 524 /* Boot file size in blocks as reported by the DHCP server */
 525 extern u32      net_boot_file_expected_size_in_blocks;
 526
 527 #if defined(CONFIG_CMD_DNS)
 528 extern char *net_dns_resolve;           /* The host to resolve  */
 529 extern char *net_dns_env_var;           /* the env var to put the ip into */
 530 #endif
 531
 532 #if defined(CONFIG_CMD_PING)
 533 extern struct in_addr net_ping_ip;      /* the ip address to ping */
 534 #endif
 535
 536 #if defined(CONFIG_CMD_CDP)
 537 /* when CDP completes these hold the return values */
 538 extern ushort cdp_native_vlan;          /* CDP returned native VLAN */
 539 extern ushort cdp_appliance_vlan;       /* CDP returned appliance VLAN */
 540
 541 /*
 542  * Check for a CDP packet by examining the received MAC address field
 543  */
 544 static inline int is_cdp_packet(const uchar *ethaddr)
 545 {
 546         extern const u8 net_cdp_ethaddr[6];
 547
 548         return memcmp(ethaddr, net_cdp_ethaddr, 6) == 0;
 549 }
 550 #endif
 551
 552 #if defined(CONFIG_CMD_SNTP)
 553 extern struct in_addr   net_ntp_server;         /* the ip address to NTP */
 554 extern int net_ntp_time_offset;                 /* offset time from UTC */
 555 #endif
 556
 557 #if defined(CONFIG_MCAST_TFTP)
 558 extern struct in_addr net_mcast_addr;
 559 #endif
 560
 561 /* Initialize the network adapter */
 562 void net_init(void);
 563 int net_loop(enum proto_t);
 564
 565 /* Load failed.  Start again. */
 566 int net_start_again(void);
 567
 568 /* Get size of the ethernet header when we send */
 569 int net_eth_hdr_size(void);
 570
 571 /* Set ethernet header; returns the size of the header */
 572 int net_set_ether(uchar *xet, const uchar *dest_ethaddr, uint prot);
 573 int net_update_ether(struct ethernet_hdr *et, uchar *addr, uint prot);
 574
 575 /* Set IP header */
 576 void net_set_ip_header(uchar *pkt, struct in_addr dest, struct in_addr source);
 577 void net_set_udp_header(uchar *pkt, struct in_addr dest, int dport,
 578                                 int sport, int len);
 579
 580 /**
 581  * compute_ip_checksum() - Compute IP checksum
 582  *
 583  * @addr:       Address to check (must be 16-bit aligned)
 584  * @nbytes:     Number of bytes to check (normally a multiple of 2)
 585  * @return 16-bit IP checksum
 586  */
 587 unsigned compute_ip_checksum(const void *addr, unsigned nbytes);
 588
 589 /**
 590  * add_ip_checksums() - add two IP checksums
 591  *
 592  * @offset:     Offset of first sum (if odd we do a byte-swap)
 593  * @sum:        First checksum
 594  * @new_sum:    New checksum to add
 595  * @return updated 16-bit IP checksum
 596  */
 597 unsigned add_ip_checksums(unsigned offset, unsigned sum, unsigned new_sum);
 598
 599 /**
 600  * ip_checksum_ok() - check if a checksum is correct
 601  *
 602  * This works by making sure the checksum sums to 0
 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 true if the checksum matches, false if not
 607  */
 608 int ip_checksum_ok(const void *addr, unsigned nbytes);
 609
 610 /* Callbacks */
 611 rxhand_f *net_get_udp_handler(void);    /* Get UDP RX packet handler */
 612 void net_set_udp_handler(rxhand_f *);   /* Set UDP RX packet handler */
 613 rxhand_f *net_get_arp_handler(void);    /* Get ARP RX packet handler */
 614 void net_set_arp_handler(rxhand_f *);   /* Set ARP RX packet handler */
 615 void net_set_icmp_handler(rxhand_icmp_f *f); /* Set ICMP RX handler */
 616 void net_set_timeout_handler(ulong, thand_f *);/* Set timeout handler */
 617
 618 /* Network loop state */
 619 enum net_loop_state {
 620         NETLOOP_CONTINUE,
 621         NETLOOP_RESTART,
 622         NETLOOP_SUCCESS,
 623         NETLOOP_FAIL
 624 };
 625 extern enum net_loop_state net_state;
 626
 627 static inline void net_set_state(enum net_loop_state state)
 628 {
 629         debug_cond(DEBUG_INT_STATE, "--- NetState set to %d\n", state);
 630         net_state = state;
 631 }
 632
 633 /* Transmit a packet */
 634 static inline void net_send_packet(uchar *pkt, int len)
 635 {
 636         /* Currently no way to return errors from eth_send() */
 637         (void) eth_send(pkt, len);
 638 }
 639
 640 /*
 641  * Transmit "net_tx_packet" as UDP packet, performing ARP request if needed
 642  *  (ether will be populated)
 643  *
 644  * @param ether Raw packet buffer
 645  * @param dest IP address to send the datagram to
 646  * @param dport Destination UDP port
 647  * @param sport Source UDP port
 648  * @param payload_len Length of data after the UDP header
 649  */
 650 int net_send_udp_packet(uchar *ether, struct in_addr dest, int dport,
 651                         int sport, int payload_len);
 652
 653 /* Processes a received packet */
 654 void net_process_received_packet(uchar *in_packet, int len);
 655
 656 #ifdef CONFIG_NETCONSOLE
 657 void nc_start(void);
 658 int nc_input_packet(uchar *pkt, struct in_addr src_ip, unsigned dest_port,
 659         unsigned src_port, unsigned len);
 660 #endif
 661
 662 static inline __attribute__((always_inline)) int eth_is_on_demand_init(void)
 663 {
 664 #ifdef CONFIG_NETCONSOLE
 665         extern enum proto_t net_loop_last_protocol;
 666
 667         return net_loop_last_protocol != NETCONS;
 668 #else
 669         return 1;
 670 #endif
 671 }
 672
 673 static inline void eth_set_last_protocol(int protocol)
 674 {
 675 #ifdef CONFIG_NETCONSOLE
 676         extern enum proto_t net_loop_last_protocol;
 677
 678         net_loop_last_protocol = protocol;
 679 #endif
 680 }
 681
 682 /*
 683  * Check if autoload is enabled. If so, use either NFS or TFTP to download
 684  * the boot file.
 685  */
 686 void net_auto_load(void);
 687
 688 /*
 689  * The following functions are a bit ugly, but necessary to deal with
 690  * alignment restrictions on ARM.
 691  *
 692  * We're using inline functions, which had the smallest memory
 693  * footprint in our tests.
 694  */
 695 /* return IP *in network byteorder* */
 696 static inline struct in_addr net_read_ip(void *from)
 697 {
 698         struct in_addr ip;
 699
 700         memcpy((void *)&ip, (void *)from, sizeof(ip));
 701         return ip;
 702 }
 703
 704 /* return ulong *in network byteorder* */
 705 static inline u32 net_read_u32(u32 *from)
 706 {
 707         u32 l;
 708
 709         memcpy((void *)&l, (void *)from, sizeof(l));
 710         return l;
 711 }
 712
 713 /* write IP *in network byteorder* */
 714 static inline void net_write_ip(void *to, struct in_addr ip)
 715 {
 716         memcpy(to, (void *)&ip, sizeof(ip));
 717 }
 718
 719 /* copy IP */
 720 static inline void net_copy_ip(void *to, void *from)
 721 {
 722         memcpy((void *)to, from, sizeof(struct in_addr));
 723 }
 724
 725 /* copy ulong */
 726 static inline void net_copy_u32(u32 *to, u32 *from)
 727 {
 728         memcpy((void *)to, (void *)from, sizeof(u32));
 729 }
 730
 731 /**
 732  * is_zero_ethaddr - Determine if give Ethernet address is all zeros.
 733  * @addr: Pointer to a six-byte array containing the Ethernet address
 734  *
 735  * Return true if the address is all zeroes.
 736  */
 737 static inline int is_zero_ethaddr(const u8 *addr)
 738 {
 739         return !(addr[0] | addr[1] | addr[2] | addr[3] | addr[4] | addr[5]);
 740 }
 741
 742 /**
 743  * is_multicast_ethaddr - Determine if the Ethernet address is a multicast.
 744  * @addr: Pointer to a six-byte array containing the Ethernet address
 745  *
 746  * Return true if the address is a multicast address.
 747  * By definition the broadcast address is also a multicast address.
 748  */
 749 static inline int is_multicast_ethaddr(const u8 *addr)
 750 {
 751         return 0x01 & addr[0];
 752 }
 753
 754 /*
 755  * is_broadcast_ethaddr - Determine if the Ethernet address is broadcast
 756  * @addr: Pointer to a six-byte array containing the Ethernet address
 757  *
 758  * Return true if the address is the broadcast address.
 759  */
 760 static inline int is_broadcast_ethaddr(const u8 *addr)
 761 {
 762         return (addr[0] & addr[1] & addr[2] & addr[3] & addr[4] & addr[5]) ==
 763                 0xff;
 764 }
 765
 766 /*
 767  * is_valid_ethaddr - Determine if the given Ethernet address is valid
 768  * @addr: Pointer to a six-byte array containing the Ethernet address
 769  *
 770  * Check that the Ethernet address (MAC) is not 00:00:00:00:00:00, is not
 771  * a multicast address, and is not FF:FF:FF:FF:FF:FF.
 772  *
 773  * Return true if the address is valid.
 774  */
 775 static inline int is_valid_ethaddr(const u8 *addr)
 776 {
 777         /* FF:FF:FF:FF:FF:FF is a multicast address so we don't need to
 778          * explicitly check for it here. */
 779         return !is_multicast_ethaddr(addr) && !is_zero_ethaddr(addr);
 780 }
 781
 782 /**
 783  * net_random_ethaddr - Generate software assigned random Ethernet address
 784  * @addr: Pointer to a six-byte array containing the Ethernet address
 785  *
 786  * Generate a random Ethernet address (MAC) that is not multicast
 787  * and has the local assigned bit set.
 788  */
 789 static inline void net_random_ethaddr(uchar *addr)
 790 {
 791         int i;
 792         unsigned int seed = get_timer(0);
 793
 794         for (i = 0; i < 6; i++)
 795                 addr[i] = rand_r(&seed);
 796
 797         addr[0] &= 0xfe;        /* clear multicast bit */
 798         addr[0] |= 0x02;        /* set local assignment bit (IEEE802) */
 799 }
 800
 801 /* Convert an IP address to a string */
 802 void ip_to_string(struct in_addr x, char *s);
 803
 804 /* Convert a string to ip address */
 805 struct in_addr string_to_ip(const char *s);
 806
 807 /* Convert a VLAN id to a string */
 808 void vlan_to_string(ushort x, char *s);
 809
 810 /* Convert a string to a vlan id */
 811 ushort string_to_vlan(const char *s);
 812
 813 /* read a VLAN id from an environment variable */
 814 ushort getenv_vlan(char *);
 815
 816 /* copy a filename (allow for "..." notation, limit length) */
 817 void copy_filename(char *dst, const char *src, int size);
 818
 819 /* get a random source port */
 820 unsigned int random_port(void);
 821
 822 /**
 823  * update_tftp - Update firmware over TFTP (via DFU)
 824  *
 825  * This function updates board's firmware via TFTP
 826  *
 827  * @param addr - memory address where data is stored
 828  * @param interface - the DFU medium name - e.g. "mmc"
 829  * @param devstring - the DFU medium number - e.g. "1"
 830  *
 831  * @return - 0 on success, other value on failure
 832  */
 833 int update_tftp(ulong addr, char *interface, char *devstring);
 834
 835 /**********************************************************************/
 836
 837 #endif /* __NET_H__ */