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