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
 153 /* Used only when NetConsole is enabled */
 154 int eth_is_active(struct udevice *dev); /* Test device for active state */
 155 int eth_init_state_only(void); /* Set active state */
 156 void eth_halt_state_only(void); /* Set passive state */
 157 #endif
 158
 159 #ifndef CONFIG_DM_ETH
 160 struct eth_device {
 161         char name[16];
 162         unsigned char enetaddr[6];
 163         phys_addr_t iobase;
 164         int state;
 165
 166         int (*init)(struct eth_device *, bd_t *);
 167         int (*send)(struct eth_device *, void *packet, int length);
 168         int (*recv)(struct eth_device *);
 169         void (*halt)(struct eth_device *);
 170 #ifdef CONFIG_MCAST_TFTP
 171         int (*mcast)(struct eth_device *, const u8 *enetaddr, u8 set);
 172 #endif
 173         int (*write_hwaddr)(struct eth_device *);
 174         struct eth_device *next;
 175         int index;
 176         void *priv;
 177 };
 178
 179 int eth_register(struct eth_device *dev);/* Register network device */
 180 int eth_unregister(struct eth_device *dev);/* Remove network device */
 181
 182 extern struct eth_device *eth_current;
 183
 184 static inline __attribute__((always_inline))
 185 struct eth_device *eth_get_dev(void)
 186 {
 187         return eth_current;
 188 }
 189 struct eth_device *eth_get_dev_by_name(const char *devname);
 190 struct eth_device *eth_get_dev_by_index(int index); /* get dev @ index */
 191
 192 /* get the current device MAC */
 193 static inline unsigned char *eth_get_ethaddr(void)
 194 {
 195         if (eth_current)
 196                 return eth_current->enetaddr;
 197         return NULL;
 198 }
 199
 200 /* Used only when NetConsole is enabled */
 201 int eth_is_active(struct eth_device *dev); /* Test device for active state */
 202 /* Set active state */
 203 static inline __attribute__((always_inline)) int eth_init_state_only(void)
 204 {
 205         eth_get_dev()->state = ETH_STATE_ACTIVE;
 206
 207         return 0;
 208 }
 209 /* Set passive state */
 210 static inline __attribute__((always_inline)) void eth_halt_state_only(void)
 211 {
 212         eth_get_dev()->state = ETH_STATE_PASSIVE;
 213 }
 214
 215 /*
 216  * Set the hardware address for an ethernet interface based on 'eth%daddr'
 217  * environment variable (or just 'ethaddr' if eth_number is 0).
 218  * Args:
 219  *      base_name - base name for device (normally "eth")
 220  *      eth_number - value of %d (0 for first device of this type)
 221  * Returns:
 222  *      0 is success, non-zero is error status from driver.
 223  */
 224 int eth_write_hwaddr(struct eth_device *dev, const char *base_name,
 225                      int eth_number);
 226
 227 int usb_eth_initialize(bd_t *bi);
 228 #endif
 229
 230 int eth_initialize(void);               /* Initialize network subsystem */
 231 void eth_try_another(int first_restart);        /* Change the device */
 232 void eth_set_current(void);             /* set nterface to ethcur var */
 233
 234 int eth_get_dev_index(void);            /* get the device index */
 235 void eth_parse_enetaddr(const char *addr, uchar *enetaddr);
 236 int eth_getenv_enetaddr(const char *name, uchar *enetaddr);
 237 int eth_setenv_enetaddr(const char *name, const uchar *enetaddr);
 238
 239 /*
 240  * Get the hardware address for an ethernet interface .
 241  * Args:
 242  *      base_name - base name for device (normally "eth")
 243  *      index - device index number (0 for first)
 244  *      enetaddr - returns 6 byte hardware address
 245  * Returns:
 246  *      Return true if the address is valid.
 247  */
 248 int eth_getenv_enetaddr_by_index(const char *base_name, int index,
 249                                  uchar *enetaddr);
 250
 251 int eth_init(void);                     /* Initialize the device */
 252 int eth_send(void *packet, int length);    /* Send a packet */
 253
 254 #ifdef CONFIG_API
 255 int eth_receive(void *packet, int length); /* Receive a packet*/
 256 extern void (*push_packet)(void *packet, int length);
 257 #endif
 258 int eth_rx(void);                       /* Check for received packets */
 259 void eth_halt(void);                    /* stop SCC */
 260 const char *eth_get_name(void);         /* get name of current device */
 261
 262 #ifdef CONFIG_MCAST_TFTP
 263 int eth_mcast_join(struct in_addr mcast_addr, int join);
 264 u32 ether_crc(size_t len, unsigned char const *p);
 265 #endif
 266
 267
 268 /**********************************************************************/
 269 /*
 270  *      Protocol headers.
 271  */
 272
 273 /*
 274  *      Ethernet header
 275  */
 276
 277 struct ethernet_hdr {
 278         u8              et_dest[6];     /* Destination node             */
 279         u8              et_src[6];      /* Source node                  */
 280         u16             et_protlen;     /* Protocol or length           */
 281 };
 282
 283 /* Ethernet header size */
 284 #define ETHER_HDR_SIZE  (sizeof(struct ethernet_hdr))
 285
 286 #define ETH_FCS_LEN     4               /* Octets in the FCS            */
 287
 288 struct e802_hdr {
 289         u8              et_dest[6];     /* Destination node             */
 290         u8              et_src[6];      /* Source node                  */
 291         u16             et_protlen;     /* Protocol or length           */
 292         u8              et_dsap;        /* 802 DSAP                     */
 293         u8              et_ssap;        /* 802 SSAP                     */
 294         u8              et_ctl;         /* 802 control                  */
 295         u8              et_snap1;       /* SNAP                         */
 296         u8              et_snap2;
 297         u8              et_snap3;
 298         u16             et_prot;        /* 802 protocol                 */
 299 };
 300
 301 /* 802 + SNAP + ethernet header size */
 302 #define E802_HDR_SIZE   (sizeof(struct e802_hdr))
 303
 304 /*
 305  *      Virtual LAN Ethernet header
 306  */
 307 struct vlan_ethernet_hdr {
 308         u8              vet_dest[6];    /* Destination node             */
 309         u8              vet_src[6];     /* Source node                  */
 310         u16             vet_vlan_type;  /* PROT_VLAN                    */
 311         u16             vet_tag;        /* TAG of VLAN                  */
 312         u16             vet_type;       /* protocol type                */
 313 };
 314
 315 /* VLAN Ethernet header size */
 316 #define VLAN_ETHER_HDR_SIZE     (sizeof(struct vlan_ethernet_hdr))
 317
 318 #define PROT_IP         0x0800          /* IP protocol                  */
 319 #define PROT_ARP        0x0806          /* IP ARP protocol              */
 320 #define PROT_RARP       0x8035          /* IP ARP protocol              */
 321 #define PROT_VLAN       0x8100          /* IEEE 802.1q protocol         */
 322
 323 #define IPPROTO_ICMP     1      /* Internet Control Message Protocol    */
 324 #define IPPROTO_UDP     17      /* User Datagram Protocol               */
 325
 326 /*
 327  *      Internet Protocol (IP) header.
 328  */
 329 struct ip_hdr {
 330         u8              ip_hl_v;        /* header length and version    */
 331         u8              ip_tos;         /* type of service              */
 332         u16             ip_len;         /* total length                 */
 333         u16             ip_id;          /* identification               */
 334         u16             ip_off;         /* fragment offset field        */
 335         u8              ip_ttl;         /* time to live                 */
 336         u8              ip_p;           /* protocol                     */
 337         u16             ip_sum;         /* checksum                     */
 338         struct in_addr  ip_src;         /* Source IP address            */
 339         struct in_addr  ip_dst;         /* Destination IP address       */
 340 };
 341
 342 #define IP_OFFS         0x1fff /* ip offset *= 8 */
 343 #define IP_FLAGS        0xe000 /* first 3 bits */
 344 #define IP_FLAGS_RES    0x8000 /* reserved */
 345 #define IP_FLAGS_DFRAG  0x4000 /* don't fragments */
 346 #define IP_FLAGS_MFRAG  0x2000 /* more fragments */
 347
 348 #define IP_HDR_SIZE             (sizeof(struct ip_hdr))
 349
 350 /*
 351  *      Internet Protocol (IP) + UDP header.
 352  */
 353 struct ip_udp_hdr {
 354         u8              ip_hl_v;        /* header length and version    */
 355         u8              ip_tos;         /* type of service              */
 356         u16             ip_len;         /* total length                 */
 357         u16             ip_id;          /* identification               */
 358         u16             ip_off;         /* fragment offset field        */
 359         u8              ip_ttl;         /* time to live                 */
 360         u8              ip_p;           /* protocol                     */
 361         u16             ip_sum;         /* checksum                     */
 362         struct in_addr  ip_src;         /* Source IP address            */
 363         struct in_addr  ip_dst;         /* Destination IP address       */
 364         u16             udp_src;        /* UDP source port              */
 365         u16             udp_dst;        /* UDP destination port         */
 366         u16             udp_len;        /* Length of UDP packet         */
 367         u16             udp_xsum;       /* Checksum                     */
 368 };
 369
 370 #define IP_UDP_HDR_SIZE         (sizeof(struct ip_udp_hdr))
 371 #define UDP_HDR_SIZE            (IP_UDP_HDR_SIZE - IP_HDR_SIZE)
 372
 373 /*
 374  *      Address Resolution Protocol (ARP) header.
 375  */
 376 struct arp_hdr {
 377         u16             ar_hrd;         /* Format of hardware address   */
 378 #   define ARP_ETHER        1           /* Ethernet  hardware address   */
 379         u16             ar_pro;         /* Format of protocol address   */
 380         u8              ar_hln;         /* Length of hardware address   */
 381 #   define ARP_HLEN     6
 382         u8              ar_pln;         /* Length of protocol address   */
 383 #   define ARP_PLEN     4
 384         u16             ar_op;          /* Operation                    */
 385 #   define ARPOP_REQUEST    1           /* Request  to resolve  address */
 386 #   define ARPOP_REPLY      2           /* Response to previous request */
 387
 388 #   define RARPOP_REQUEST   3           /* Request  to resolve  address */
 389 #   define RARPOP_REPLY     4           /* Response to previous request */
 390
 391         /*
 392          * The remaining fields are variable in size, according to
 393          * the sizes above, and are defined as appropriate for
 394          * specific hardware/protocol combinations.
 395          */
 396         u8              ar_data[0];
 397 #define ar_sha          ar_data[0]
 398 #define ar_spa          ar_data[ARP_HLEN]
 399 #define ar_tha          ar_data[ARP_HLEN + ARP_PLEN]
 400 #define ar_tpa          ar_data[ARP_HLEN + ARP_PLEN + ARP_HLEN]
 401 #if 0
 402         u8              ar_sha[];       /* Sender hardware address      */
 403         u8              ar_spa[];       /* Sender protocol address      */
 404         u8              ar_tha[];       /* Target hardware address      */
 405         u8              ar_tpa[];       /* Target protocol address      */
 406 #endif /* 0 */
 407 };
 408
 409 #define ARP_HDR_SIZE    (8+20)          /* Size assuming ethernet       */
 410
 411 /*
 412  * ICMP stuff (just enough to handle (host) redirect messages)
 413  */
 414 #define ICMP_ECHO_REPLY         0       /* Echo reply                   */
 415 #define ICMP_NOT_REACH          3       /* Detination unreachable       */
 416 #define ICMP_REDIRECT           5       /* Redirect (change route)      */
 417 #define ICMP_ECHO_REQUEST       8       /* Echo request                 */
 418
 419 /* Codes for REDIRECT. */
 420 #define ICMP_REDIR_NET          0       /* Redirect Net                 */
 421 #define ICMP_REDIR_HOST         1       /* Redirect Host                */
 422
 423 /* Codes for NOT_REACH */
 424 #define ICMP_NOT_REACH_PORT     3       /* Port unreachable             */
 425
 426 struct icmp_hdr {
 427         u8              type;
 428         u8              code;
 429         u16             checksum;
 430         union {
 431                 struct {
 432                         u16     id;
 433                         u16     sequence;
 434                 } echo;
 435                 u32     gateway;
 436                 struct {
 437                         u16     unused;
 438                         u16     mtu;
 439                 } frag;
 440                 u8 data[0];
 441         } un;
 442 };
 443
 444 #define ICMP_HDR_SIZE           (sizeof(struct icmp_hdr))
 445 #define IP_ICMP_HDR_SIZE        (IP_HDR_SIZE + ICMP_HDR_SIZE)
 446
 447 /*
 448  * Maximum packet size; used to allocate packet storage.
 449  * TFTP packets can be 524 bytes + IP header + ethernet header.
 450  * Lets be conservative, and go for 38 * 16.  (Must also be
 451  * a multiple of 32 bytes).
 452  */
 453 /*
 454  * AS.HARNOIS : Better to set PKTSIZE to maximum size because
 455  * traffic type is not always controlled
 456  * maximum packet size =  1518
 457  * maximum packet size and multiple of 32 bytes =  1536
 458  */
 459 #define PKTSIZE                 1518
 460 #define PKTSIZE_ALIGN           1536
 461 /*#define PKTSIZE               608*/
 462
 463 /*
 464  * Maximum receive ring size; that is, the number of packets
 465  * we can buffer before overflow happens. Basically, this just
 466  * needs to be enough to prevent a packet being discarded while
 467  * we are processing the previous one.
 468  */
 469 #define RINGSZ          4
 470 #define RINGSZ_LOG2     2
 471
 472 /**********************************************************************/
 473 /*
 474  *      Globals.
 475  *
 476  * Note:
 477  *
 478  * All variables of type struct in_addr are stored in NETWORK byte order
 479  * (big endian).
 480  */
 481
 482 /* net.c */
 483 /** BOOTP EXTENTIONS **/
 484 extern struct in_addr net_gateway;      /* Our gateway IP address */
 485 extern struct in_addr net_netmask;      /* Our subnet mask (0 = unknown) */
 486 /* Our Domain Name Server (0 = unknown) */
 487 extern struct in_addr net_dns_server;
 488 #if defined(CONFIG_BOOTP_DNS2)
 489 /* Our 2nd Domain Name Server (0 = unknown) */
 490 extern struct in_addr net_dns_server2;
 491 #endif
 492 extern char     net_nis_domain[32];     /* Our IS domain */
 493 extern char     net_hostname[32];       /* Our hostname */
 494 extern char     net_root_path[64];      /* Our root path */
 495 /** END OF BOOTP EXTENTIONS **/
 496 extern u8               net_ethaddr[6];         /* Our ethernet address */
 497 extern u8               net_server_ethaddr[6];  /* Boot server enet address */
 498 extern struct in_addr   net_ip;         /* Our    IP addr (0 = unknown) */
 499 extern struct in_addr   net_server_ip;  /* Server IP addr (0 = unknown) */
 500 extern uchar            *net_tx_packet;         /* THE transmit packet */
 501 extern uchar            *net_rx_packets[PKTBUFSRX]; /* Receive packets */
 502 extern uchar            *net_rx_packet;         /* Current receive packet */
 503 extern int              net_rx_packet_len;      /* Current rx packet length */
 504 extern const u8         net_bcast_ethaddr[6];   /* Ethernet broadcast address */
 505 extern const u8         net_null_ethaddr[6];
 506
 507 #define VLAN_NONE       4095                    /* untagged */
 508 #define VLAN_IDMASK     0x0fff                  /* mask of valid vlan id */
 509 extern ushort           net_our_vlan;           /* Our VLAN */
 510 extern ushort           net_native_vlan;        /* Our Native VLAN */
 511
 512 extern int              net_restart_wrap;       /* Tried all network devices */
 513
 514 enum proto_t {
 515         BOOTP, RARP, ARP, TFTPGET, DHCP, PING, DNS, NFS, CDP, NETCONS, SNTP,
 516         TFTPSRV, TFTPPUT, LINKLOCAL
 517 };
 518
 519 extern char     net_boot_file_name[1024];/* Boot File name */
 520 /* The actual transferred size of the bootfile (in bytes) */
 521 extern u32      net_boot_file_size;
 522 /* Boot file size in blocks as reported by the DHCP server */
 523 extern u32      net_boot_file_expected_size_in_blocks;
 524
 525 #if defined(CONFIG_CMD_DNS)
 526 extern char *net_dns_resolve;           /* The host to resolve  */
 527 extern char *net_dns_env_var;           /* the env var to put the ip into */
 528 #endif
 529
 530 #if defined(CONFIG_CMD_PING)
 531 extern struct in_addr net_ping_ip;      /* the ip address to ping */
 532 #endif
 533
 534 #if defined(CONFIG_CMD_CDP)
 535 /* when CDP completes these hold the return values */
 536 extern ushort cdp_native_vlan;          /* CDP returned native VLAN */
 537 extern ushort cdp_appliance_vlan;       /* CDP returned appliance VLAN */
 538
 539 /*
 540  * Check for a CDP packet by examining the received MAC address field
 541  */
 542 static inline int is_cdp_packet(const uchar *ethaddr)
 543 {
 544         extern const u8 net_cdp_ethaddr[6];
 545
 546         return memcmp(ethaddr, net_cdp_ethaddr, 6) == 0;
 547 }
 548 #endif
 549
 550 #if defined(CONFIG_CMD_SNTP)
 551 extern struct in_addr   net_ntp_server;         /* the ip address to NTP */
 552 extern int net_ntp_time_offset;                 /* offset time from UTC */
 553 #endif
 554
 555 #if defined(CONFIG_MCAST_TFTP)
 556 extern struct in_addr net_mcast_addr;
 557 #endif
 558
 559 /* Initialize the network adapter */
 560 void net_init(void);
 561 int net_loop(enum proto_t);
 562
 563 /* Load failed.  Start again. */
 564 int net_start_again(void);
 565
 566 /* Get size of the ethernet header when we send */
 567 int net_eth_hdr_size(void);
 568
 569 /* Set ethernet header; returns the size of the header */
 570 int net_set_ether(uchar *xet, const uchar *dest_ethaddr, uint prot);
 571 int net_update_ether(struct ethernet_hdr *et, uchar *addr, uint prot);
 572
 573 /* Set IP header */
 574 void net_set_ip_header(uchar *pkt, struct in_addr dest, struct in_addr source);
 575 void net_set_udp_header(uchar *pkt, struct in_addr dest, int dport,
 576                                 int sport, int len);
 577
 578 /**
 579  * compute_ip_checksum() - Compute IP checksum
 580  *
 581  * @addr:       Address to check (must be 16-bit aligned)
 582  * @nbytes:     Number of bytes to check (normally a multiple of 2)
 583  * @return 16-bit IP checksum
 584  */
 585 unsigned compute_ip_checksum(const void *addr, unsigned nbytes);
 586
 587 /**
 588  * add_ip_checksums() - add two IP checksums
 589  *
 590  * @offset:     Offset of first sum (if odd we do a byte-swap)
 591  * @sum:        First checksum
 592  * @new_sum:    New checksum to add
 593  * @return updated 16-bit IP checksum
 594  */
 595 unsigned add_ip_checksums(unsigned offset, unsigned sum, unsigned new_sum);
 596
 597 /**
 598  * ip_checksum_ok() - check if a checksum is correct
 599  *
 600  * This works by making sure the checksum sums to 0
 601  *
 602  * @addr:       Address to check (must be 16-bit aligned)
 603  * @nbytes:     Number of bytes to check (normally a multiple of 2)
 604  * @return true if the checksum matches, false if not
 605  */
 606 int ip_checksum_ok(const void *addr, unsigned nbytes);
 607
 608 /* Callbacks */
 609 rxhand_f *net_get_udp_handler(void);    /* Get UDP RX packet handler */
 610 void net_set_udp_handler(rxhand_f *);   /* Set UDP RX packet handler */
 611 rxhand_f *net_get_arp_handler(void);    /* Get ARP RX packet handler */
 612 void net_set_arp_handler(rxhand_f *);   /* Set ARP RX packet handler */
 613 void net_set_icmp_handler(rxhand_icmp_f *f); /* Set ICMP RX handler */
 614 void net_set_timeout_handler(ulong, thand_f *);/* Set timeout handler */
 615
 616 /* Network loop state */
 617 enum net_loop_state {
 618         NETLOOP_CONTINUE,
 619         NETLOOP_RESTART,
 620         NETLOOP_SUCCESS,
 621         NETLOOP_FAIL
 622 };
 623 extern enum net_loop_state net_state;
 624
 625 static inline void net_set_state(enum net_loop_state state)
 626 {
 627         debug_cond(DEBUG_INT_STATE, "--- NetState set to %d\n", state);
 628         net_state = state;
 629 }
 630
 631 /* Transmit a packet */
 632 static inline void net_send_packet(uchar *pkt, int len)
 633 {
 634         /* Currently no way to return errors from eth_send() */
 635         (void) eth_send(pkt, len);
 636 }
 637
 638 /*
 639  * Transmit "net_tx_packet" as UDP packet, performing ARP request if needed
 640  *  (ether will be populated)
 641  *
 642  * @param ether Raw packet buffer
 643  * @param dest IP address to send the datagram to
 644  * @param dport Destination UDP port
 645  * @param sport Source UDP port
 646  * @param payload_len Length of data after the UDP header
 647  */
 648 int net_send_udp_packet(uchar *ether, struct in_addr dest, int dport,
 649                         int sport, int payload_len);
 650
 651 /* Processes a received packet */
 652 void net_process_received_packet(uchar *in_packet, int len);
 653
 654 #ifdef CONFIG_NETCONSOLE
 655 void nc_start(void);
 656 int nc_input_packet(uchar *pkt, struct in_addr src_ip, unsigned dest_port,
 657         unsigned src_port, unsigned len);
 658 #endif
 659
 660 static inline __attribute__((always_inline)) int eth_is_on_demand_init(void)
 661 {
 662 #ifdef CONFIG_NETCONSOLE
 663         extern enum proto_t net_loop_last_protocol;
 664
 665         return net_loop_last_protocol != NETCONS;
 666 #else
 667         return 1;
 668 #endif
 669 }
 670
 671 static inline void eth_set_last_protocol(int protocol)
 672 {
 673 #ifdef CONFIG_NETCONSOLE
 674         extern enum proto_t net_loop_last_protocol;
 675
 676         net_loop_last_protocol = protocol;
 677 #endif
 678 }
 679
 680 /*
 681  * Check if autoload is enabled. If so, use either NFS or TFTP to download
 682  * the boot file.
 683  */
 684 void net_auto_load(void);
 685
 686 /*
 687  * The following functions are a bit ugly, but necessary to deal with
 688  * alignment restrictions on ARM.
 689  *
 690  * We're using inline functions, which had the smallest memory
 691  * footprint in our tests.
 692  */
 693 /* return IP *in network byteorder* */
 694 static inline struct in_addr net_read_ip(void *from)
 695 {
 696         struct in_addr ip;
 697
 698         memcpy((void *)&ip, (void *)from, sizeof(ip));
 699         return ip;
 700 }
 701
 702 /* return ulong *in network byteorder* */
 703 static inline u32 net_read_u32(u32 *from)
 704 {
 705         u32 l;
 706
 707         memcpy((void *)&l, (void *)from, sizeof(l));
 708         return l;
 709 }
 710
 711 /* write IP *in network byteorder* */
 712 static inline void net_write_ip(void *to, struct in_addr ip)
 713 {
 714         memcpy(to, (void *)&ip, sizeof(ip));
 715 }
 716
 717 /* copy IP */
 718 static inline void net_copy_ip(void *to, void *from)
 719 {
 720         memcpy((void *)to, from, sizeof(struct in_addr));
 721 }
 722
 723 /* copy ulong */
 724 static inline void net_copy_u32(u32 *to, u32 *from)
 725 {
 726         memcpy((void *)to, (void *)from, sizeof(u32));
 727 }
 728
 729 /**
 730  * is_zero_ethaddr - Determine if give Ethernet address is all zeros.
 731  * @addr: Pointer to a six-byte array containing the Ethernet address
 732  *
 733  * Return true if the address is all zeroes.
 734  */
 735 static inline int is_zero_ethaddr(const u8 *addr)
 736 {
 737         return !(addr[0] | addr[1] | addr[2] | addr[3] | addr[4] | addr[5]);
 738 }
 739
 740 /**
 741  * is_multicast_ethaddr - Determine if the Ethernet address is a multicast.
 742  * @addr: Pointer to a six-byte array containing the Ethernet address
 743  *
 744  * Return true if the address is a multicast address.
 745  * By definition the broadcast address is also a multicast address.
 746  */
 747 static inline int is_multicast_ethaddr(const u8 *addr)
 748 {
 749         return 0x01 & addr[0];
 750 }
 751
 752 /*
 753  * is_broadcast_ethaddr - Determine if the Ethernet address is broadcast
 754  * @addr: Pointer to a six-byte array containing the Ethernet address
 755  *
 756  * Return true if the address is the broadcast address.
 757  */
 758 static inline int is_broadcast_ethaddr(const u8 *addr)
 759 {
 760         return (addr[0] & addr[1] & addr[2] & addr[3] & addr[4] & addr[5]) ==
 761                 0xff;
 762 }
 763
 764 /*
 765  * is_valid_ethaddr - Determine if the given Ethernet address is valid
 766  * @addr: Pointer to a six-byte array containing the Ethernet address
 767  *
 768  * Check that the Ethernet address (MAC) is not 00:00:00:00:00:00, is not
 769  * a multicast address, and is not FF:FF:FF:FF:FF:FF.
 770  *
 771  * Return true if the address is valid.
 772  */
 773 static inline int is_valid_ethaddr(const u8 *addr)
 774 {
 775         /* FF:FF:FF:FF:FF:FF is a multicast address so we don't need to
 776          * explicitly check for it here. */
 777         return !is_multicast_ethaddr(addr) && !is_zero_ethaddr(addr);
 778 }
 779
 780 /**
 781  * net_random_ethaddr - Generate software assigned random Ethernet address
 782  * @addr: Pointer to a six-byte array containing the Ethernet address
 783  *
 784  * Generate a random Ethernet address (MAC) that is not multicast
 785  * and has the local assigned bit set.
 786  */
 787 static inline void net_random_ethaddr(uchar *addr)
 788 {
 789         int i;
 790         unsigned int seed = get_timer(0);
 791
 792         for (i = 0; i < 6; i++)
 793                 addr[i] = rand_r(&seed);
 794
 795         addr[0] &= 0xfe;        /* clear multicast bit */
 796         addr[0] |= 0x02;        /* set local assignment bit (IEEE802) */
 797 }
 798
 799 /* Convert an IP address to a string */
 800 void ip_to_string(struct in_addr x, char *s);
 801
 802 /* Convert a string to ip address */
 803 struct in_addr string_to_ip(const char *s);
 804
 805 /* Convert a VLAN id to a string */
 806 void vlan_to_string(ushort x, char *s);
 807
 808 /* Convert a string to a vlan id */
 809 ushort string_to_vlan(const char *s);
 810
 811 /* read a VLAN id from an environment variable */
 812 ushort getenv_vlan(char *);
 813
 814 /* copy a filename (allow for "..." notation, limit length) */
 815 void copy_filename(char *dst, const char *src, int size);
 816
 817 /* get a random source port */
 818 unsigned int random_port(void);
 819
 820 /**
 821  * update_tftp - Update firmware over TFTP (via DFU)
 822  *
 823  * This function updates board's firmware via TFTP
 824  *
 825  * @param addr - memory address where data is stored
 826  * @param interface - the DFU medium name - e.g. "mmc"
 827  * @param devstring - the DFU medium number - e.g. "1"
 828  *
 829  * @return - 0 on success, other value on failure
 830  */
 831 int update_tftp(ulong addr, char *interface, char *devstring);
 832
 833 /**********************************************************************/
 834
 835 #endif /* __NET_H__ */