changelog

RT-Thread是发展中的下一代微内核嵌入式实时操作系统

    value). It will avoid potential fragmentation problems, use a counter to know
    how many times a group is used on an netif, and free it when all applications
    leave it. MEMP_NUM_IGMP_GROUP got 8 as default value (and init.c got a sanity
    check if LWIP_IGMP!=0).

  2007-09-03 Fr閐閞ic Bernon
  * igmp.h, igmp.c, sockets.c, api_msg.c: Changes for "#20503 IGMP Improvement".
    Initialize igmp_mac_filter to NULL in netif_add (this field should be set in
    the netif's "init" function). Use the "imr_interface" field (for socket layer)
    and/or the "interface" field (for netconn layer), for join/leave operations.
    The igmp_join/leavegroup first parameter change from a netif to an ipaddr.
    This field could be a netif's ipaddr, or "any" (same meaning than ip_addr_isany).

  2007-08-30 Fr閐閞ic Bernon
  * Add netbuf.h, netbuf.c, Change api.h, api_lib.c: #7249 "Split netbuf functions
    from api/api_lib". Now netbuf API is independant of netconn, and can be used
    with other API (application based on raw API, or future "socket2" API). Ports
    maintainers just have to add src/api/netbuf.c in their makefile/projects.

  2007-08-30 Fr閐閞ic Bernon, Jonathan Larmour
  * init.c: Add first version of lwip_sanity_check for task #7142 "Sanity check
    user-configurable values".

  2007-08-29 Fr閐閞ic Bernon
  * igmp.h, igmp.c, tcpip.c, init.c, netif.c: change igmp_init and add igmp_start.
    igmp_start is call inside netif_add. Now, igmp initialization is in the same
    spirit than the others modules. Modify some IGMP debug traces.

  2007-08-29 Fr閐閞ic Bernon
  * Add init.h, init.c, Change opt.h, tcpip.c: Task  #7213 "Add a lwip_init function"
    Add lwip_init function to regroup all modules initializations, and to provide
    a place to add code for task #7142 "Sanity check user-configurable values".
    Ports maintainers should remove direct initializations calls from their code,
    and add init.c in their makefiles. Note that lwip_init() function is called
    inside tcpip_init, but can also be used by raw api users since all calls are
    disabled when matching options are disabled. Also note that their is new options
    in opt.h, you should configure in your lwipopts.h (they are enabled per default).

  2007-08-26 Marc Boucher
  * api_msg.c: do_close_internal(): Reset the callbacks and arg (conn) to NULL
    since they can under certain circumstances be called with an invalid conn
    pointer after the connection has been closed (and conn has been freed). 

  2007-08-25 Fr閐閞ic Bernon (Artem Migaev's Patch)
  * netif.h, netif.c: Integrate "patch #6163 : Function to check if link layer is up".
    Add a netif_is_link_up() function if LWIP_NETIF_LINK_CALLBACK option is set.

  2007-08-22 Fr閐閞ic Bernon
  * netif.h, netif.c, opt.h: Rename LWIP_NETIF_CALLBACK in LWIP_NETIF_STATUS_CALLBACK
    to be coherent with new LWIP_NETIF_LINK_CALLBACK option before next release.

  2007-08-22 Fr閐閞ic Bernon
  * tcpip.h, tcpip.c, ethernetif.c, opt.h: remove options ETHARP_TCPIP_INPUT &
    ETHARP_TCPIP_ETHINPUT, now, only "ethinput" code is supported, even if the 
    name is tcpip_input (we keep the name of 1.2.0 function).

  2007-08-17 Jared Grubb
  * memp_std.h, memp.h, memp.c, mem.c, stats.c: (Task #7136) Centralize mempool 
    settings into new memp_std.h and optional user file lwippools.h. This adds
    more dynamic mempools, and allows the user to create an arbitrary number of
    mempools for mem_malloc.

  2007-08-16 Marc Boucher
  * api_msg.c: Initialize newconn->state to NETCONN_NONE in accept_function;
    otherwise it was left to NETCONN_CLOSE and sent_tcp() could prematurely
    close the connection.

  2007-08-16 Marc Boucher
  * sockets.c: lwip_accept(): check netconn_peer() error return.

  2007-08-16 Marc Boucher
  * mem.c, mem.h: Added mem_calloc().

  2007-08-16 Marc Boucher
  * tcpip.c, tcpip.h memp.c, memp.h: Added distinct memp (MEMP_TCPIP_MSG_INPKT)
    for input packets to prevent floods from consuming all of MEMP_TCPIP_MSG
    and starving other message types.
    Renamed MEMP_TCPIP_MSG to MEMP_TCPIP_MSG_API

  2007-08-16 Marc Boucher
  * pbuf.c, pbuf.h, etharp.c, tcp_in.c, sockets.c: Split pbuf flags in pbuf
    type and flgs (later renamed to flags).
    Use enum pbuf_flag as pbuf_type.  Renumber PBUF_FLAG_*.
    Improved lwip_recvfrom().  TCP push now propagated.

  2007-08-16 Marc Boucher
  * ethernetif.c, contrib/ports/various: ethbroadcast now a shared global
    provided by etharp.

  2007-08-16 Marc Boucher
  * ppp_oe.c ppp_oe.h, auth.c chap.c fsm.c lcp.c ppp.c ppp.h,
    etharp.c ethernetif.c, etharp.h, opt.h tcpip.h, tcpip.c:
    Added PPPoE support and various PPP improvements.

  2007-07-25 Simon Goldschmidt
  * api_lib.c, ip_frag.c, pbuf.c, api.h, pbuf.h: Introduced pbuf_copy_partial,
    making netbuf_copy_partial use this function.

  2007-07-25 Simon Goldschmidt
  * tcp_in.c: Fix bug #20506: Slow start / initial congestion window starts with
    2 * mss (instead of 1 * mss previously) to comply with some newer RFCs and
    other stacks.

  2007-07-13 Jared Grubb (integrated by Fr閐閞ic Bernon)
  * opt.h, netif.h, netif.c, ethernetif.c: Add new configuration option to add
    a link callback in the netif struct, and functions to handle it. Be carefull
    for port maintainers to add the NETIF_FLAG_LINK_UP flag (like in ethernetif.c)
    if you want to be sure to be compatible with future changes...

  2007-06-30 Fr閐閞ic Bernon
  * sockets.h, sockets.c: Implement MSG_PEEK flag for recv/recvfrom functions.

  2007-06-21 Simon Goldschmidt
  * etharp.h, etharp.c: Combined etharp_request with etharp_raw for both
    LWIP_AUTOIP =0 and =1 to remove redundant code.

  2007-06-21 Simon Goldschmidt
  * mem.c, memp.c, mem.h, memp.h, opt.h: task #6863: Introduced the option
    MEM_USE_POOLS to use 4 pools with different sized elements instead of a
    heap. This both prevents memory fragmentation and gives a higher speed
    at the cost of more memory consumption. Turned off by default.

  2007-06-21 Simon Goldschmidt
  * api_lib.c, api_msg.c, api.h, api_msg.h: Converted the length argument of
    netconn_write (and therefore also api_msg_msg.msg.w.len) from u16_t into
    int to be able to send a bigger buffer than 64K with one time (mainly
    used from lwip_send).

  2007-06-21 Simon Goldschmidt
  * tcp.h, api_msg.c: Moved the nagle algorithm from netconn_write/do_write
    into a define (tcp_output_nagle) in tcp.h to provide it to raw api users, too.

  2007-06-21 Simon Goldschmidt
  * api.h, api_lib.c, api_msg.c: Fixed bug #20021: Moved sendbuf-processing in
    netconn_write from api_lib.c to api_msg.c to also prevent multiple context-
    changes on low memory or empty send-buffer.

  2007-06-18 Simon Goldschmidt
  * etharp.c, etharp.h: Changed etharp to use a defined hardware address length
    of 6 to avoid loading netif->hwaddr_len every time (since this file is only
    used for ethernet and struct eth_addr already had a defined length of 6).

  2007-06-17 Simon Goldschmidt
  * sockets.c, sockets.h: Implemented socket options SO_NO_CHECK for UDP sockets
    to disable UDP checksum generation on transmit.

  2007-06-13 Fr閐閞ic Bernon, Simon Goldschmidt
  * debug.h, api_msg.c: change LWIP_ERROR to use it to check errors like invalid
    pointers or parameters, and let the possibility to redefined it in cc.h. Use
    this macro to check "conn" parameter in api_msg.c functions.

  2007-06-11 Simon Goldschmidt
  * sockets.c, sockets.h: Added UDP lite support for sockets

  2007-06-10 Simon Goldschmidt
  * udp.h, opt.h, api_msg.c, ip.c, udp.c: Included switch LWIP_UDPLITE (enabled
    by default) to switch off UDP-Lite support if not needed (reduces udp.c code
    size)

  2007-06-09 Dominik Spies (integrated by Fr閐閞ic Bernon)
  * autoip.h, autoip.c, dhcp.h, dhcp.c, netif.h, netif.c, etharp.h, etharp.c, opt.h:
    AutoIP implementation available for IPv4, with new options LWIP_AUTOIP and
    LWIP_DHCP_AUTOIP_COOP if you want to cooperate with DHCP. Some tips to adapt
    (see TODO mark in the source code).

  2007-06-09 Simon Goldschmidt
  * etharp.h, etharp.c, ethernetif.c: Modified order of parameters for
    etharp_output() to match netif->output so etharp_output() can be used
    directly as netif->output to save one function call.

  2007-06-08 Simon Goldschmidt
  * netif.h, ethernetif.c, slipif.c, loopif.c: Added define
    NETIF_INIT_SNMP(netif, type, speed) to initialize per-netif snmp variables,
    added initialization of those to ethernetif, slipif and loopif.

  2007-05-18 Simon Goldschmidt
  * opt.h, ip_frag.c, ip_frag.h, ip.c: Added option IP_FRAG_USES_STATIC_BUF
    (defaulting to off for now) that can be set to 0 to send fragmented
    packets by passing PBUF_REFs down the stack.

  2007-05-23 Fr閐閞ic Bernon
  * api_lib.c: Implement SO_RCVTIMEO for accept and recv on TCP
    connections, such present in patch #5959.

  2007-05-23 Fr閐閞ic Bernon
  * api.h, api_lib.c, api_msg.c, sockets.c: group the different NETCONN_UDPxxx
    code in only one part...

  2007-05-18 Simon Goldschmidt
  * opt.h, memp.h, memp.c: Added option MEMP_OVERFLOW_CHECK to check for memp
    elements to overflow. This is achieved by adding some bytes before and after
    each pool element (increasing their size, of course), filling them with a
    prominent value and checking them on freeing the element.
    Set it to 2 to also check every element in every pool each time memp_malloc()
    or memp_free() is called (slower but more helpful).

  2007-05-10 Simon Goldschmidt
  * opt.h, memp.h, memp.c, pbuf.c (see task #6831): use a new memp pool for
    PBUF_POOL pbufs instead of the old pool implementation in pbuf.c to reduce
    code size.

  2007-05-11 Fr閐閞ic Bernon
  * sockets.c, api_lib.c, api_msg.h, api_msg.c, netifapi.h, netifapi.c, tcpip.c:
    Include a function pointer instead of a table index in the message to reduce
    footprint. Disable some part of lwip_send and lwip_sendto if some options are
    not set (LWIP_TCP, LWIP_UDP, LWIP_RAW).

  2007-05-10 Simon Goldschmidt
  * *.h (except netif/ppp/*.h): Included patch #5448: include '#ifdef __cplusplus
    \ extern "C" {' in all header files. Now you can write your application using
    the lwIP stack in C++ and simply #include the core files. Note I have left
    out the netif/ppp/*h header files for now, since I don't know which files are
    included by applications and which are for internal use only.

  2007-05-09 Simon Goldschmidt
  * opt.h, *.c/*.h: Included patch #5920: Create define to override C-library
    memcpy. 2 Defines are created: MEMCPY() for normal memcpy, SMEMCPY() for
    situations where some compilers might inline the copy and save a function
    call. Also replaced all calls to memcpy() with calls to (S)MEMCPY().

  2007-05-08 Simon Goldschmidt
  * mem.h: If MEM_LIBC_MALLOC==1, allow the defines (e.g. mem_malloc() -> malloc())
    to be overriden in case the C-library malloc implementation is not protected
    against concurrent access.

  2007-05-04 Simon Goldschmidt (Atte Kojo)
  * etharp.c: Introduced fast one-entry-cache to speed up ARP lookup when sending
    multiple packets to the same host.

  2007-05-04 Fr閐閞ic Bernon, Jonathan Larmour
  * sockets.c, api.h, api_lib.c, api_msg.h, api_msg.c: Fix bug #19162 "lwip_sento: a possible
    to corrupt remote addr/port connection state". Reduce problems "not enought memory" with
    netbuf (if we receive lot of datagrams). Improve lwip_sendto (only one exchange between
    sockets api and api_msg which run in tcpip_thread context). Add netconn_sento function.
    Warning, if you directly access to "fromaddr" & "fromport" field from netbuf struct,
    these fields are now renamed "addr" & "port".

  2007-04-11 Jonathan Larmour
  * sys.h, api_lib.c: Provide new sys_mbox_tryfetch function. Require ports to provide new
    sys_arch_mbox_tryfetch function to get a message if one is there, otherwise return
    with SYS_MBOX_EMPTY. sys_arch_mbox_tryfetch can be implemented as a function-like macro
    by the port in sys_arch.h if desired.

  2007-04-06 Fr閐閞ic Bernon, Simon Goldschmidt
  * opt.h, tcpip.h, tcpip.c, netifapi.h, netifapi.c: New configuration option LWIP_NETIF_API
    allow to use thread-safe functions to add/remove netif in list, and to start/stop dhcp
    clients, using new functions from netifapi.h. Disable as default (no port change to do).

  2007-04-05 Fr閐閞ic Bernon
  * sockets.c: remplace ENOBUFS errors on alloc_socket by ENFILE to be more BSD compliant.

  2007-04-04 Simon Goldschmidt
  * arch.h, api_msg.c, dhcp.c, msg_in.c, sockets.c: Introduced #define LWIP_UNUSED_ARG(x)
    use this for and architecture-independent form to tell the compiler you intentionally
    are not using this variable. Can be overriden in cc.h.

  2007-03-28 Fr閐閞ic Bernon
  * opt.h, netif.h, dhcp.h, dhcp.c: New configuration option LWIP_NETIF_HOSTNAME allow to
    define a hostname in netif struct (this is just a pointer, so, you can use a hardcoded
    string, point on one of your's ethernetif field, or alloc a string you will free yourself).
    It will be used by DHCP to register a client hostname, but can also be use when you call
    snmp_set_sysname.

  2007-03-28 Fr閐閞ic Bernon
  * netif.h, netif.c: A new NETIF_FLAG_ETHARP flag is defined in netif.h, to allow to 
    initialize a network interface's flag with. It tell this interface is an ethernet
    device, and we can use ARP with it to do a "gratuitous ARP" (RFC 3220 "IP Mobility
    Support for IPv4" section 4.6) when interface is "up" with netif_set_up().

  2007-03-26 Fr閐閞ic Bernon, Jonathan Larmour
  * opt.h, tcpip.c: New configuration option LWIP_ARP allow to disable ARP init at build
    time if you only use PPP or SLIP. The default is enable. Note we don't have to call 
    etharp_init in your port's initilization sequence if you use tcpip.c, because this call
    is done in tcpip_init function.

  2007-03-22 Fr閐閞ic Bernon
  * stats.h, stats.c, msg_in.c: Stats counters can be change to u32_t if necessary with the
    new option LWIP_STATS_LARGE. If you need this option, define LWIP_STATS_LARGE to 1 in
    your lwipopts.h. More, unused counters are not defined in the stats structs, and not