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 
    display by stats_display(). Note that some options (SYS_STATS and RAW_STATS) are defined
    but never used. Fix msg_in.c with the correct #if test for a stat display.

  2007-03-21 Kieran Mansley
  * netif.c, netif.h: Apply patch#4197 with some changes (originator: rireland@hmgsl.com). 
    Provides callback on netif up/down state change.

  2007-03-11 Fr閐閞ic Bernon, Mace Gael, Steve Reynolds
  * sockets.h, sockets.c, api.h, api_lib.c, api_msg.h, api_msg.c, igmp.h, igmp.c,
    ip.c, netif.h, tcpip.c, opt.h:
    New configuration option LWIP_IGMP to enable IGMP processing. Based on only one 
    filter per all network interfaces. Declare a new function in netif to enable to
    control the MAC filter (to reduce lwIP traffic processing).

  2007-03-11 Fr閐閞ic Bernon
  * tcp.h, tcp.c, sockets.c, tcp_out.c, tcp_in.c, opt.h: Keepalive values can
    be configured at run time with LWIP_TCP_KEEPALIVE, but don't change this
    unless you know what you're doing (default are RFC1122 compliant). Note
    that TCP_KEEPIDLE and TCP_KEEPINTVL have to be set in seconds.

  2007-03-08 Fr閐閞ic Bernon
  * tcp.h: Keepalive values can be configured at compile time, but don't change
    this unless you know what you're doing (default are RFC1122 compliant).

  2007-03-08 Fr閐閞ic Bernon
  * sockets.c, api.h, api_lib.c, tcpip.c, sys.h, sys.c, err.c, opt.h:
    Implement LWIP_SO_RCVTIMEO configuration option to enable/disable SO_RCVTIMEO
    on UDP sockets/netconn.

  2007-03-08 Simon Goldschmidt
  * snmp_msg.h, msg_in.c: SNMP UDP ports can be configured at compile time.

  2007-03-06 Fr閐閞ic Bernon
  * api.h, api_lib.c, sockets.h, sockets.c, tcpip.c, sys.h, sys.c, err.h: 
    Implement SO_RCVTIMEO on UDP sockets/netconn.

  2007-02-28 Kieran Mansley (based on patch from Simon Goldschmidt)
  * api_lib.c, tcpip.c, memp.c, memp.h: make API msg structs allocated
    on the stack and remove the API msg type from memp

  2007-02-26 Jonathan Larmour (based on patch from Simon Goldschmidt)
  * sockets.h, sockets.c: Move socket initialization to new
    lwip_socket_init() function.
    NOTE: this changes the API with ports. Ports will have to be
    updated to call lwip_socket_init() now.

  2007-02-26 Jonathan Larmour (based on patch from Simon Goldschmidt)
  * api_lib.c: Use memcpy in netbuf_copy_partial.


  ++ Bug fixes:

  2008-03-17 Fr閐閞ic Bernon, Ed Kerekes
  * igmp.h, igmp.c: Fix bug #22613 "IGMP iphdr problem" (could have
    some problems to fill the IP header on some targets, use now the
    ip.h macros to do it).

  2008-03-13 Fr閐閞ic Bernon
  * sockets.c: Fix bug #22435 "lwip_recvfrom with TCP break;". Using
    (lwip_)recvfrom with valid "from" and "fromlen" parameters, on a
    TCP connection caused a crash. Note that using (lwip_)recvfrom
    like this is a bit slow and that using (lwip)getpeername is the
    good lwip way to do it (so, using recv is faster on tcp sockets).

  2008-03-12 Fr閐閞ic Bernon, Jonathan Larmour
  * api_msg.c, contrib/apps/ping.c: Fix bug #22530 "api_msg.c's
    recv_raw() does not consume data", and the ping sample (with
    LWIP_SOCKET=1, the code did the wrong supposition that lwip_recvfrom
    returned the IP payload, without the IP header).

  2008-03-04 Jonathan Larmour
  * mem.c, stats.c, mem.h: apply patch #6414 to avoid compiler errors
  and/or warnings on some systems where mem_size_t and size_t differ.
  * pbuf.c, ppp.c: Fix warnings on some systems with mem_malloc.

  2008-03-04 Kieran Mansley (contributions by others) 
  * Numerous small compiler error/warning fixes from contributions to
    mailing list after 1.3.0 release candidate made.

  2008-01-25 Cui hengbin (integrated by Fr閐閞ic Bernon)
  * dns.c: Fix bug #22108 "DNS problem" caused by unaligned structures.

  2008-01-15 Kieran Mansley
  * tcp_out.c: BUG20511.  Modify persist timer to start when we are
    prevented from sending by a small send window, not just a zero
    send window.

  2008-01-09 Jonathan Larmour
  * opt.h, ip.c: Rename IP_OPTIONS define to IP_OPTIONS_ALLOWED to avoid
    conflict with Linux system headers.

  2008-01-06 Jonathan Larmour
  * dhcp.c: fix bug #19927: "DHCP NACK problem" by clearing any existing set IP
    address entirely on receiving a DHCPNAK, and restarting discovery.

  2007-12-21 Simon Goldschmidt
  * sys.h, api_lib.c, api_msg.c, sockets.c: fix bug #21698: "netconn->recv_avail
    is not protected" by using new macros for interlocked access to modify/test
    netconn->recv_avail.

  2007-12-20 Kieran Mansley (based on patch from Oleg Tyshev)
  * tcp_in.c: fix bug# 21535 (nrtx not reset correctly in SYN_SENT state)

  2007-12-20 Kieran Mansley (based on patch from Per-Henrik Lundbolm)
  * tcp.c, tcp_in.c, tcp_out.c, tcp.h: fix bug #20199 (better handling
    of silly window avoidance and prevent lwIP from shrinking the window)

  2007-12-04 Simon Goldschmidt
  * tcp.c, tcp_in.c: fix bug #21699 (segment leak in ooseq processing when last
    data packet was lost): add assert that all segment lists are empty in
    tcp_pcb_remove before setting pcb to CLOSED state; don't directly set CLOSED
    state from LAST_ACK in tcp_process

  2007-12-02 Simon Goldschmidt
  * sockets.h: fix bug #21654: exclude definition of struct timeval from #ifndef FD_SET
    If including <sys/time.h> for system-struct timeval, LWIP_TIMEVAL_PRIVATE now
    has to be set to 0 in lwipopts.h

  2007-12-02 Simon Goldschmidt
  * api_msg.c, api_lib.c: fix bug #21656 (recvmbox problem in netconn API): always
    allocate a recvmbox in netconn_new_with_proto_and_callback. For a tcp-listen
    netconn, this recvmbox is later freed and a new mbox is allocated for acceptmbox.
    This is a fix for thread-safety and allocates all items needed for a netconn
    when the netconn is created.

  2007-11-30 Simon Goldschmidt
  * udp.c: first attempt to fix bug #21655 (DHCP doesn't work reliably with multiple
    netifs): if LWIP_DHCP is enabled, UDP packets to DHCP_CLIENT_PORT are passed
    to netif->dhcp->pcb only (if that exists) and not to any other pcb for the same
    port (only solution to let UDP pcbs 'bind' to a netif instead of an IP address)

  2007-11-27 Simon Goldschmidt
  * ip.c: fixed bug #21643 (udp_send/raw_send don't fail if netif is down) by
    letting ip_route only use netifs that are up.

  2007-11-27 Simon Goldschmidt
  * err.h, api_lib.c, api_msg.c, sockets.c: Changed error handling: ERR_MEM, ERR_BUF
    and ERR_RTE are seen as non-fatal, all other errors are fatal. netconns and
    sockets block most operations once they have seen a fatal error.

  2007-11-27 Simon Goldschmidt
  * udp.h, udp.c, dhcp.c: Implemented new function udp_sendto_if which takes the
    netif to send as an argument (to be able to send on netifs that are down).

  2007-11-26 Simon Goldschmidt
  * tcp_in.c: Fixed bug #21582: pcb->acked accounting can be wrong when ACKs
    arrive out-of-order

  2007-11-21 Simon Goldschmidt
  * tcp.h, tcp_out.c, api_msg.c: Fixed bug #20287: tcp_output_nagle sends too early
    Fixed the nagle algorithm; nagle now also works for all raw API applications
    and has to be explicitly disabled with 'tcp_pcb->flags |= TF_NODELAY'

  2007-11-12 Fr閐閞ic Bernon
  * sockets.c, api.h, api_lib.c, api_msg.h, api_msg.c: Fixed bug #20900. Now, most
    of the netconn_peer and netconn_addr processing is done inside tcpip_thread
    context in do_getaddr.

  2007-11-10 Simon Goldschmidt
  * etharp.c: Fixed bug: assert fired when MEMP_ARP_QUEUE was empty (which can
    happen any time). Now the packet simply isn't enqueued when out of memory.

  2007-11-01 Simon Goldschmidt
  * tcp.c, tcp_in.c: Fixed bug #21494: The send mss (pcb->mss) is set to 536 (or
    TCP_MSS if that is smaller) as long as no MSS option is received from the
    remote host.

  2007-11-01 Simon Goldschmidt
  * tcp.h, tcp.c, tcp_in.c: Fixed bug #21491: The MSS option sent (with SYN)
    is now based on TCP_MSS instead of pcb->mss (on passive open now effectively
    sending our configured TCP_MSS instead of the one received).

  2007-11-01 Simon Goldschmidt
  * tcp_in.c: Fixed bug #21181: On active open, the initial congestion window was
    calculated based on the configured TCP_MSS, not on the MSS option received
    with SYN+ACK.

  2007-10-09 Simon Goldschmidt
  * udp.c, inet.c, inet.h: Fixed UDPLite: send: Checksum was always generated too