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  */
  90 struct eth_pdata {
  91         phys_addr_t iobase;
  92         unsigned char enetaddr[6];
  93         int phy_interface;
  94 };
  95
  96 enum eth_recv_flags {
  97         /*
  98          * Check hardware device for new packets (otherwise only return those
  99          * which are already in the memory buffer ready to process)
 100          */
 101         ETH_RECV_CHECK_DEVICE           = 1 << 0,
 102 };
 103
 104 /**
 105  * struct eth_ops - functions of Ethernet MAC controllers
 106  *
 107  * start: Prepare the hardware to send and receive packets
 108  * send: Send the bytes passed in "packet" as a packet on the wire
 109  * recv: Check if the hardware received a packet. If so, set the pointer to the
 110  *       packet buffer in the packetp parameter. If not, return an error or 0 to
 111  *       indicate that the hardware receive FIFO is empty. If 0 is returned, the
 112  *       network stack will not process the empty packet, but free_pkt() will be
 113  *       called if supplied
 114  * free_pkt: Give the driver an opportunity to manage its packet buffer memory
 115  *           when the network stack is finished processing it. This will only be
 116  *           called when no error was returned from recv - optional
 117  * stop: Stop the hardware from looking for packets - may be called even if
 118  *       state == PASSIVE
 119  * mcast: Join or leave a multicast group (for TFTP) - optional
 120  * write_hwaddr: Write a MAC address to the hardware (used to pass it to Linux
 121  *               on some platforms like ARM). This function expects the
 122  *               eth_pdata::enetaddr field to be populated. The method can
 123  *               return -ENOSYS to indicate that this is not implemented for
 124                  this hardware - optional.
 125  * read_rom_hwaddr: Some devices have a backup of the MAC address stored in a
 126  *                  ROM on the board. This is how the driver should expose it
 127  *                  to the network stack. This function should fill in the
 128  *                  eth_pdata::enetaddr field - optional
 129  */
 130 struct eth_ops {
 131         int (*start)(struct udevice *dev);
 132         int (*send)(struct udevice *dev, void *packet, int length);
 133         int (*recv)(struct udevice *dev, int flags, uchar **packetp);
 134         int (*free_pkt)(struct udevice *dev, uchar *packet, int length);
 135         void (*stop)(struct udevice *dev);
 136 #ifdef CONFIG_MCAST_TFTP
 137         int (*mcast)(struct udevice *dev, const u8 *enetaddr, int join);
 138 #endif
 139         int (*write_hwaddr)(struct udevice *dev);
 140         int (*read_rom_hwaddr)(struct udevice *dev);
 141 };
 142
 143 #define eth_get_ops(dev) ((struct eth_ops *)(dev)->driver->ops)
 144
 145 struct udevice *eth_get_dev(void); /* get the current device */
 146 /*
 147  * The devname can be either an exact name given by the driver or device tree
 148  * or it can be an alias of the form "eth%d"
 149  */
 150 struct udevice *eth_get_dev_by_name(const char *devname);
 151 unsigned char *eth_get_ethaddr(void); /* get the current device MAC */
 152 /* Used only when NetConsole is enabled */
 153 int eth_init_state_only(void); /* Set active state */
 154 void eth_halt_state_only(void); /* Set passive state */
 155 #endif
 156
 157 #ifndef CONFIG_DM_ETH
 158 struct eth_device {
 159         char name[16];
 160         unsigned char enetaddr[6];
 161         phys_addr_t iobase;
 162         int state;
 163
 164         int (*init)(struct eth_device *, bd_t *);
 165         int (*send)(struct eth_device *, void *packet, int length);
 166         int (*recv)(struct eth_device *);
 167         void (*halt)(struct eth_device *);
 168 #ifdef CONFIG_MCAST_TFTP
 169         int (*mcast)(struct eth_device *, const u8 *enetaddr, u8 set);
 170 #endif
 171         int (*write_hwaddr)(struct eth_device *);
 172         struct eth_device *next;
 173         int index;
 174         void *priv;
 175 };
 176
 177 int eth_register(struct eth_device *dev);/* Register network device */
 178 int eth_unregister(struct eth_device *dev);/* Remove network device */
 179
 180 extern struct eth_device *eth_current;
 181
 182 static inline __attribute__((always_inline))
 183 struct eth_device *eth_get_dev(void)
 184 {
 185         return eth_current;
 186 }
 187 struct eth_device *eth_get_dev_by_name(const char *devname);
 188 struct eth_device *eth_get_dev_by_index(int index); /* get dev @ index */
 189
 190 /* get the current device MAC */
 191 static inline unsigned char *eth_get_ethaddr(void)
 192 {
 193         if (eth_current)
 194                 return eth_current->enetaddr;
 195         return NULL;
 196 }
 197
 198 /* Set active state */
 199 static inline __attribute__((always_inline)) int eth_init_state_only(void)
 200 {
 201         eth_get_dev()->state = ETH_STATE_ACTIVE;
 202
 203         return 0;
 204 }
 205 /* Set passive state */
 206 static inline __attribute__((always_inline)) void eth_halt_state_only(void)
 207 {
 208         eth_get_dev()->state = ETH_STATE_PASSIVE;
 209 }
 210
 211 /*
 212  * Set the hardware address for an ethernet interface based on 'eth%daddr'
 213  * environment variable (or just 'ethaddr' if eth_number is 0).
 214  * Args:
 215  *      base_name - base name for device (normally "eth")
 216  *      eth_number - value of %d (0 for first device of this type)
 217  * Returns:
 218  *      0 is success, non-zero is error status from driver.
 219  */
 220 int eth_write_hwaddr(struct eth_device *dev, const char *base_name,
 221                      int eth_number);
 222
 223 int usb_eth_initialize(bd_t *bi);
 224 #endif
 225
 226 int eth_initialize(void);               /* Initialize network subsystem */
 227 void eth_try_another(int first_restart);        /* Change the device */
 228 void eth_set_current(void);             /* set nterface to ethcur var */
 229
 230 int eth_get_dev_index(void);            /* get the device index */
 231 void eth_parse_enetaddr(const char *addr, uchar *enetaddr);
 232 int eth_getenv_enetaddr(char *name, uchar *enetaddr);
 233 int eth_setenv_enetaddr(char *name, const uchar *enetaddr);
 234
 235 /*
 236  * Get the hardware address for an ethernet interface .
 237  * Args:
 238  *      base_name - base name for device (normally "eth")
 239  *      index - device index number (0 for first)
 240  *      enetaddr - returns 6 byte hardware address
 241  * Returns:
 242  *      Return true if the address is valid.
 243  */
 244 int eth_getenv_enetaddr_by_index(const char *base_name, int index,
 245                                  uchar *enetaddr);
 246
 247 int eth_init(void);                     /* Initialize the device */
 248 int eth_send(void *packet, int length);    /* Send a packet */
 249
 250 #ifdef CONFIG_API
 251 int eth_receive(void *packet, int length); /* Receive a packet*/
 252 extern void (*push_packet)(void *packet, int length);
 253 #endif
 254 int eth_rx(void);                       /* Check for received packets */
 255 void eth_halt(void);                    /* stop SCC */
 256 const char *eth_get_name(void);         /* get name of current device */
 257
 258 #ifdef CONFIG_MCAST_TFTP
 259 int eth_mcast_join(struct in_addr mcast_addr, int join);
 260 u32 ether_crc(size_t len, unsigned char const *p);
 261 #endif
 262
 263
 264 /**********************************************************************/
 265 /*
 266  *      Protocol headers.
 267  */
 268
 269 /*
 270  *      Ethernet header
 271  */
 272
 273 struct ethernet_hdr {
 274         u8              et_dest[6];     /* Destination node             */
 275         u8              et_src[6];      /* Source node                  */
 276         u16             et_protlen;     /* Protocol or length           */
 277 };
 278
 279 /* Ethernet header size */
 280 #define ETHER_HDR_SIZE  (sizeof(struct ethernet_hdr))
 281
 282 #define ETH_FCS_LEN     4               /* Octets in the FCS            */
 283
 284 struct e802_hdr {
 285         u8              et_dest[6];     /* Destination node             */
 286         u8              et_src[6];      /* Source node                  */
 287         u16             et_protlen;     /* Protocol or length           */
 288         u8              et_dsap;        /* 802 DSAP                     */
 289         u8              et_ssap;        /* 802 SSAP                     */
 290         u8              et_ctl;         /* 802 control                  */
 291         u8              et_snap1;       /* SNAP                         */
 292         u8              et_snap2;
 293         u8              et_snap3;
 294         u16             et_prot;        /* 802 protocol                 */
 295 };
 296
 297 /* 802 + SNAP + ethernet header size */
 298 #define E802_HDR_SIZE   (sizeof(struct e802_hdr))
 299
 300 /*
 301  *      Virtual LAN Ethernet header
 302  */
 303 struct vlan_ethernet_hdr {
 304         u8              vet_dest[6];    /* Destination node             */
 305         u8              vet_src[6];     /* Source node                  */
 306         u16             vet_vlan_type;  /* PROT_VLAN                    */
 307         u16             vet_tag;        /* TAG of VLAN                  */
 308         u16             vet_type;       /* protocol type                */
 309 };
 310
 311 /* VLAN Ethernet header size */
 312 #define VLAN_ETHER_HDR_SIZE     (sizeof(struct vlan_ethernet_hdr))
 313
 314 #define PROT_IP         0x0800          /* IP protocol                  */
 315 #define PROT_ARP        0x0806          /* IP ARP protocol              */
 316 #define PROT_RARP       0x8035          /* IP ARP protocol              */
 317 #define PROT_VLAN       0x8100          /* IEEE 802.1q protocol         */
 318
 319 #define IPPROTO_ICMP     1      /* Internet Control Message Protocol    */
 320 #define IPPROTO_UDP     17      /* User Datagram Protocol               */
 321
 322 /*
 323  *      Internet Protocol (IP) header.
 324  */
 325 struct ip_hdr {
 326         u8              ip_hl_v;        /* header length and version    */
 327         u8              ip_tos;         /* type of service              */
 328         u16             ip_len;         /* total length                 */
 329         u16             ip_id;          /* identification               */
 330         u16             ip_off;         /* fragment offset field        */
 331         u8              ip_ttl;         /* time to live                 */
 332         u8              ip_p;           /* protocol                     */
 333         u16             ip_sum;         /* checksum                     */
 334         struct in_addr  ip_src;         /* Source IP address            */
 335         struct in_addr  ip_dst;         /* Destination IP address       */
 336 };
 337
 338 #define IP_OFFS         0x1fff /* ip offset *= 8 */
 339 #define IP_FLAGS        0xe000 /* first 3 bits */
 340 #define IP_FLAGS_RES    0x8000 /* reserved */
 341 #define IP_FLAGS_DFRAG  0x4000 /* don't fragments */
 342 #define IP_FLAGS_MFRAG  0x2000 /* more fragments */
 343
 344 #define IP_HDR_SIZE             (sizeof(struct ip_hdr))
 345
 346 /*
 347  *      Internet Protocol (IP) + UDP header.
 348  */
 349 struct ip_udp_hdr {
 350         u8              ip_hl_v;        /* header length and version    */
 351         u8              ip_tos;         /* type of service              */
 352         u16             ip_len;         /* total length                 */
 353         u16             ip_id;          /* identification               */
 354         u16             ip_off;         /* fragment offset field        */
 355         u8              ip_ttl;         /* time to live                 */
 356         u8              ip_p;           /* protocol                     */
 357         u16             ip_sum;         /* checksum                     */
 358         struct in_addr  ip_src;         /* Source IP address            */
 359         struct in_addr  ip_dst;         /* Destination IP address       */
 360         u16             udp_src;        /* UDP source port              */
 361         u16             udp_dst;        /* UDP destination port         */
 362         u16             udp_len;        /* Length of UDP packet         */
 363         u16             udp_xsum;       /* Checksum                     */
 364 };
 365
 366 #define IP_UDP_HDR_SIZE         (sizeof(struct ip_udp_hdr))
 367 #define UDP_HDR_SIZE            (IP_UDP_HDR_SIZE - IP_HDR_SIZE)
 368
 369 /*
 370  *      Address Resolution Protocol (ARP) header.
 371  */
 372 struct arp_hdr {
 373         u16             ar_hrd;         /* Format of hardware address   */
 374 #   define ARP_ETHER        1           /* Ethernet  hardware address   */
 375         u16             ar_pro;         /* Format of protocol address   */
 376         u8              ar_hln;         /* Length of hardware address   */
 377 #   define ARP_HLEN     6
 378         u8              ar_pln;         /* Length of protocol address   */
 379 #   define ARP_PLEN     4
 380         u16             ar_op;          /* Operation                    */
 381 #   define ARPOP_REQUEST    1           /* Request  to resolve  address */
 382 #   define ARPOP_REPLY      2           /* Response to previous request */
 383
 384 #   define RARPOP_REQUEST   3           /* Request  to resolve  address */
 385 #   define RARPOP_REPLY     4           /* Response to previous request */
 386
 387         /*
 388          * The remaining fields are variable in size, according to
 389          * the sizes above, and are defined as appropriate for
 390          * specific hardware/protocol combinations.
 391          */
 392         u8              ar_data[0];
 393 #define ar_sha          ar_data[0]
 394 #define ar_spa          ar_data[ARP_HLEN]
 395 #define ar_tha          ar_data[ARP_HLEN + ARP_PLEN]
 396 #define ar_tpa          ar_data[ARP_HLEN + ARP_PLEN + ARP_HLEN]
 397 #if 0
 398         u8              ar_sha[];       /* Sender hardware address      */
 399         u8              ar_spa[];       /* Sender protocol address      */
 400         u8              ar_tha[];       /* Target hardware address      */
 401         u8              ar_tpa[];       /* Target protocol address      */
 402 #endif /* 0 */
 403 };
 404
 405 #define ARP_HDR_SIZE    (8+20)          /* Size assuming ethernet       */
 406
 407 /*
 408  * ICMP stuff (just enough to handle (host) redirect messages)
 409  */
 410 #define ICMP_ECHO_REPLY         0       /* Echo reply                   */
 411 #define ICMP_NOT_REACH          3       /* Detination unreachable       */
 412 #define ICMP_REDIRECT           5       /* Redirect (change route)      */
 413 #define ICMP_ECHO_REQUEST       8       /* Echo request                 */
 414
 415 /* Codes for REDIRECT. */
 416 #define ICMP_REDIR_NET          0       /* Redirect Net                 */
 417 #define ICMP_REDIR_HOST         1       /* Redirect Host                */
 418
 419 /* Codes for NOT_REACH */
 420 #define ICMP_NOT_REACH_PORT     3       /* Port unreachable             */
 421
 422 struct icmp_hdr {
 423         u8              type;
 424         u8              code;
 425         u16             checksum;
 426         union {
 427                 struct {
 428                         u16     id;
 429                         u16     sequence;
 430                 } echo;
 431                 u32     gateway;
 432                 struct {
 433                         u16     unused;
 434                         u16     mtu;
 435                 } frag;
 436                 u8 data[0];
 437         } un;
 438 };
 439
 440 #define ICMP_HDR_SIZE           (sizeof(struct icmp_hdr))
 441 #define IP_ICMP_HDR_SIZE        (IP_HDR_SIZE + ICMP_HDR_SIZE)
 442
 443 /*
 444  * Maximum packet size; used to allocate packet storage.
 445  * TFTP packets can be 524 bytes + IP header + ethernet header.
 446  * Lets be conservative, and go for 38 * 16.  (Must also be
 447  * a multiple of 32 bytes).
 448  */
 449 /*
 450  * AS.HARNOIS : Better to set PKTSIZE to maximum size because
 451  * traffic type is not always controlled
 452  * maximum packet size =  1518
 453  * maximum packet size and multiple of 32 bytes =  1536
 454  */
 455 #define PKTSIZE                 1518
 456 #define PKTSIZE_ALIGN           1536
 457 /*#define PKTSIZE               608*/
 458
 459 /*
 460  * Maximum receive ring size; that is, the number of packets
 461  * we can buffer before overflow happens. Basically, this just
 462  * needs to be enough to prevent a packet being discarded while
 463  * we are processing the previous one.
 464  */
 465 #define RINGSZ          4
 466 #define RINGSZ_LOG2     2
 467
 468 /**********************************************************************/
 469 /*
 470  *      Globals.
 471  *
 472  * Note:
 473  *
 474  * All variables of type struct in_addr are stored in NETWORK byte order
 475  * (big endian).
 476  */
 477
 478 /* net.c */
 479 /** BOOTP EXTENTIONS **/
 480 extern struct in_addr net_gateway;      /* Our gateway IP address */
 481 extern struct in_addr net_netmask;      /* Our subnet mask (0 = unknown) */
 482 /* Our Domain Name Server (0 = unknown) */
 483 extern struct in_addr net_dns_server;
 484 #if defined(CONFIG_BOOTP_DNS2)
 485 /* Our 2nd Domain Name Server (0 = unknown) */
 486 extern struct in_addr net_dns_server2;
 487 #endif
 488 extern char     net_nis_domain[32];     /* Our IS domain */
 489 extern char     net_hostname[32];       /* Our hostname */
 490 extern char     net_root_path[64];      /* Our root path */
 491 /** END OF BOOTP EXTENTIONS **/
 492 extern u8               net_ethaddr[6];         /* Our ethernet address */
 493 extern u8               net_server_ethaddr[6];  /* Boot server enet address */
 494 extern struct in_addr   net_ip;         /* Our    IP addr (0 = unknown) */
 495 extern struct in_addr   net_server_ip;  /* Server IP addr (0 = unknown) */
 496 extern uchar            *net_tx_packet;         /* THE transmit packet */
 497 extern uchar            *net_rx_packets[PKTBUFSRX]; /* Receive packets */
 498 extern uchar            *net_rx_packet;         /* Current receive packet */
 499 extern int              net_rx_packet_len;      /* Current rx packet length */
 500 extern const u8         net_bcast_ethaddr[6];   /* Ethernet broadcast address */
 501 extern const u8         net_null_ethaddr[6];
 502
 503 #define VLAN_NONE       4095                    /* untagged */
 504 #define VLAN_IDMASK     0x0fff                  /* mask of valid vlan id */
 505 extern ushort           net_our_vlan;           /* Our VLAN */
 506 extern ushort           net_native_vlan;        /* Our Native VLAN */
 507
 508 extern int              net_restart_wrap;       /* Tried all network devices */
 509
 510 enum proto_t {
 511         BOOTP, RARP, ARP, TFTPGET, DHCP, PING, DNS, NFS, CDP, NETCONS, SNTP,
 512         TFTPSRV, TFTPPUT, LINKLOCAL
 513 };
 514
 515 extern char     net_boot_file_name[128];/* Boot File name */
 516 /* The actual transferred size of the bootfile (in bytes) */
 517 extern u32      net_boot_file_size;
 518 /* Boot file size in blocks as reported by the DHCP server */
 519 extern u32      net_boot_file_expected_size_in_blocks;
 520
 521 #if defined(CONFIG_CMD_DNS)
 522 extern char *net_dns_resolve;           /* The host to resolve  */
 523 extern char *net_dns_env_var;           /* the env var to put the ip into */
 524 #endif
 525
 526 #if defined(CONFIG_CMD_PING)
 527 extern struct in_addr net_ping_ip;      /* the ip address to ping */
 528 #endif
 529
 530 #if defined(CONFIG_CMD_CDP)
 531 /* when CDP completes these hold the return values */
 532 extern ushort cdp_native_vlan;          /* CDP returned native VLAN */
 533 extern ushort cdp_appliance_vlan;       /* CDP returned appliance VLAN */
 534
 535 /*
 536  * Check for a CDP packet by examining the received MAC address field
 537  */
 538 static inline int is_cdp_packet(const uchar *ethaddr)
 539 {
 540         extern const u8 net_cdp_ethaddr[6];
 541
 542         return memcmp(ethaddr, net_cdp_ethaddr, 6) == 0;
 543 }
 544 #endif
 545
 546 #if defined(CONFIG_CMD_SNTP)
 547 extern struct in_addr   net_ntp_server;         /* the ip address to NTP */
 548 extern int net_ntp_time_offset;                 /* offset time from UTC */
 549 #endif
 550
 551 #if defined(CONFIG_MCAST_TFTP)
 552 extern struct in_addr net_mcast_addr;
 553 #endif
 554
 555 /* Initialize the network adapter */
 556 void net_init(void);
 557 int net_loop(enum proto_t);
 558
 559 /* Load failed.  Start again. */
 560 int net_start_again(void);
 561
 562 /* Get size of the ethernet header when we send */
 563 int net_eth_hdr_size(void);
 564
 565 /* Set ethernet header; returns the size of the header */
 566 int net_set_ether(uchar *xet, const uchar *dest_ethaddr, uint prot);
 567 int net_update_ether(struct ethernet_hdr *et, uchar *addr, uint prot);
 568
 569 /* Set IP header */
 570 void net_set_ip_header(uchar *pkt, struct in_addr dest, struct in_addr source);
 571 void net_set_udp_header(uchar *pkt, struct in_addr dest, int dport,
 572                                 int sport, int len);
 573
 574 /**
 575  * compute_ip_checksum() - Compute IP checksum
 576  *
 577  * @addr:       Address to check (must be 16-bit aligned)
 578  * @nbytes:     Number of bytes to check (normally a multiple of 2)
 579  * @return 16-bit IP checksum
 580  */
 581 unsigned compute_ip_checksum(const void *addr, unsigned nbytes);
 582
 583 /**
 584  * add_ip_checksums() - add two IP checksums
 585  *
 586  * @offset:     Offset of first sum (if odd we do a byte-swap)
 587  * @sum:        First checksum
 588  * @new_sum:    New checksum to add
 589  * @return updated 16-bit IP checksum
 590  */
 591 unsigned add_ip_checksums(unsigned offset, unsigned sum, unsigned new_sum);
 592
 593 /**
 594  * ip_checksum_ok() - check if a checksum is correct
 595  *
 596  * This works by making sure the checksum sums to 0
 597  *
 598  * @addr:       Address to check (must be 16-bit aligned)
 599  * @nbytes:     Number of bytes to check (normally a multiple of 2)
 600  * @return true if the checksum matches, false if not
 601  */
 602 int ip_checksum_ok(const void *addr, unsigned nbytes);
 603
 604 /* Callbacks */
 605 rxhand_f *net_get_udp_handler(void);    /* Get UDP RX packet handler */
 606 void net_set_udp_handler(rxhand_f *);   /* Set UDP RX packet handler */
 607 rxhand_f *net_get_arp_handler(void);    /* Get ARP RX packet handler */
 608 void net_set_arp_handler(rxhand_f *);   /* Set ARP RX packet handler */
 609 void net_set_icmp_handler(rxhand_icmp_f *f); /* Set ICMP RX handler */
 610 void net_set_timeout_handler(ulong, thand_f *);/* Set timeout handler */
 611
 612 /* Network loop state */
 613 enum net_loop_state {
 614         NETLOOP_CONTINUE,
 615         NETLOOP_RESTART,
 616         NETLOOP_SUCCESS,
 617         NETLOOP_FAIL
 618 };
 619 extern enum net_loop_state net_state;
 620
 621 static inline void net_set_state(enum net_loop_state state)
 622 {
 623         debug_cond(DEBUG_INT_STATE, "--- NetState set to %d\n", state);
 624         net_state = state;
 625 }
 626
 627 /* Transmit a packet */
 628 static inline void net_send_packet(uchar *pkt, int len)
 629 {
 630         /* Currently no way to return errors from eth_send() */
 631         (void) eth_send(pkt, len);
 632 }
 633
 634 /*
 635  * Transmit "net_tx_packet" as UDP packet, performing ARP request if needed
 636  *  (ether will be populated)
 637  *
 638  * @param ether Raw packet buffer
 639  * @param dest IP address to send the datagram to
 640  * @param dport Destination UDP port
 641  * @param sport Source UDP port
 642  * @param payload_len Length of data after the UDP header
 643  */
 644 int net_send_udp_packet(uchar *ether, struct in_addr dest, int dport,
 645                         int sport, int payload_len);
 646
 647 /* Processes a received packet */
 648 void net_process_received_packet(uchar *in_packet, int len);
 649
 650 #ifdef CONFIG_NETCONSOLE
 651 void nc_start(void);
 652 int nc_input_packet(uchar *pkt, struct in_addr src_ip, unsigned dest_port,
 653         unsigned src_port, unsigned len);
 654 #endif
 655
 656 static inline __attribute__((always_inline)) int eth_is_on_demand_init(void)
 657 {
 658 #ifdef CONFIG_NETCONSOLE
 659         extern enum proto_t net_loop_last_protocol;
 660
 661         return net_loop_last_protocol != NETCONS;
 662 #else
 663         return 1;
 664 #endif
 665 }
 666
 667 static inline void eth_set_last_protocol(int protocol)
 668 {
 669 #ifdef CONFIG_NETCONSOLE
 670         extern enum proto_t net_loop_last_protocol;
 671
 672         net_loop_last_protocol = protocol;
 673 #endif
 674 }
 675
 676 /*
 677  * Check if autoload is enabled. If so, use either NFS or TFTP to download
 678  * the boot file.
 679  */
 680 void net_auto_load(void);
 681
 682 /*
 683  * The following functions are a bit ugly, but necessary to deal with
 684  * alignment restrictions on ARM.
 685  *
 686  * We're using inline functions, which had the smallest memory
 687  * footprint in our tests.
 688  */
 689 /* return IP *in network byteorder* */
 690 static inline struct in_addr net_read_ip(void *from)
 691 {
 692         struct in_addr ip;
 693
 694         memcpy((void *)&ip, (void *)from, sizeof(ip));
 695         return ip;
 696 }
 697
 698 /* return ulong *in network byteorder* */
 699 static inline u32 net_read_u32(u32 *from)
 700 {
 701         u32 l;
 702
 703         memcpy((void *)&l, (void *)from, sizeof(l));
 704         return l;
 705 }
 706
 707 /* write IP *in network byteorder* */
 708 static inline void net_write_ip(void *to, struct in_addr ip)
 709 {
 710         memcpy(to, (void *)&ip, sizeof(ip));
 711 }
 712
 713 /* copy IP */
 714 static inline void net_copy_ip(void *to, void *from)
 715 {
 716         memcpy((void *)to, from, sizeof(struct in_addr));
 717 }
 718
 719 /* copy ulong */
 720 static inline void net_copy_u32(u32 *to, u32 *from)
 721 {
 722         memcpy((void *)to, (void *)from, sizeof(u32));
 723 }
 724
 725 /**
 726  * is_zero_ethaddr - Determine if give Ethernet address is all zeros.
 727  * @addr: Pointer to a six-byte array containing the Ethernet address
 728  *
 729  * Return true if the address is all zeroes.
 730  */
 731 static inline int is_zero_ethaddr(const u8 *addr)
 732 {
 733         return !(addr[0] | addr[1] | addr[2] | addr[3] | addr[4] | addr[5]);
 734 }
 735
 736 /**
 737  * is_multicast_ethaddr - Determine if the Ethernet address is a multicast.
 738  * @addr: Pointer to a six-byte array containing the Ethernet address
 739  *
 740  * Return true if the address is a multicast address.
 741  * By definition the broadcast address is also a multicast address.
 742  */
 743 static inline int is_multicast_ethaddr(const u8 *addr)
 744 {
 745         return 0x01 & addr[0];
 746 }
 747
 748 /*
 749  * is_broadcast_ethaddr - Determine if the Ethernet address is broadcast
 750  * @addr: Pointer to a six-byte array containing the Ethernet address
 751  *
 752  * Return true if the address is the broadcast address.
 753  */
 754 static inline int is_broadcast_ethaddr(const u8 *addr)
 755 {
 756         return (addr[0] & addr[1] & addr[2] & addr[3] & addr[4] & addr[5]) ==
 757                 0xff;
 758 }
 759
 760 /*
 761  * is_valid_ethaddr - Determine if the given Ethernet address is valid
 762  * @addr: Pointer to a six-byte array containing the Ethernet address
 763  *
 764  * Check that the Ethernet address (MAC) is not 00:00:00:00:00:00, is not
 765  * a multicast address, and is not FF:FF:FF:FF:FF:FF.
 766  *
 767  * Return true if the address is valid.
 768  */
 769 static inline int is_valid_ethaddr(const u8 *addr)
 770 {
 771         /* FF:FF:FF:FF:FF:FF is a multicast address so we don't need to
 772          * explicitly check for it here. */
 773         return !is_multicast_ethaddr(addr) && !is_zero_ethaddr(addr);
 774 }
 775
 776 /**
 777  * net_random_ethaddr - Generate software assigned random Ethernet address
 778  * @addr: Pointer to a six-byte array containing the Ethernet address
 779  *
 780  * Generate a random Ethernet address (MAC) that is not multicast
 781  * and has the local assigned bit set.
 782  */
 783 static inline void net_random_ethaddr(uchar *addr)
 784 {
 785         int i;
 786         unsigned int seed = get_timer(0);
 787
 788         for (i = 0; i < 6; i++)
 789                 addr[i] = rand_r(&seed);
 790
 791         addr[0] &= 0xfe;        /* clear multicast bit */
 792         addr[0] |= 0x02;        /* set local assignment bit (IEEE802) */
 793 }
 794
 795 /* Convert an IP address to a string */
 796 void ip_to_string(struct in_addr x, char *s);
 797
 798 /* Convert a string to ip address */
 799 struct in_addr string_to_ip(const char *s);
 800
 801 /* Convert a VLAN id to a string */
 802 void vlan_to_string(ushort x, char *s);
 803
 804 /* Convert a string to a vlan id */
 805 ushort string_to_vlan(const char *s);
 806
 807 /* read a VLAN id from an environment variable */
 808 ushort getenv_vlan(char *);
 809
 810 /* copy a filename (allow for "..." notation, limit length) */
 811 void copy_filename(char *dst, const char *src, int size);
 812
 813 /* get a random source port */
 814 unsigned int random_port(void);
 815
 816 /**
 817  * update_tftp - Update firmware over TFTP (via DFU)
 818  *
 819  * This function updates board's firmware via TFTP
 820  *
 821  * @param addr - memory address where data is stored
 822  * @param interface - the DFU medium name - e.g. "mmc"
 823  * @param devstring - the DFU medium number - e.g. "1"
 824  *
 825  * @return - 0 on success, other value on failure
 826  */
 827 int update_tftp(ulong addr, char *interface, char *devstring);
 828
 829 /**********************************************************************/
 830
 831 #endif /* __NET_H__ */