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    1 HISTORY
    2 
    3 (CVS HEAD)
    4 
    5   * [Enter new changes just after this line - do not remove this line]
    6 
    7  ++ New features:
    8 
    9 
   10  ++ Bugfixes:
   11 
   12 
   13 
   14 
   15 (STABLE-1.4.0)
   16 
   17   ++ New features:
   18 
   19   2011-03-27: Simon Goldschmidt
   20   * tcp_impl.h, tcp_in.c, tcp_out.c: Removed 'dataptr' from 'struct tcp_seg' and
   21     calculate it in tcp_zero_window_probe (the only place where it was used).
   22 
   23   2010-11-21: Simon Goldschmidt
   24   * dhcp.c/.h: Added a function to deallocate the struct dhcp from a netif
   25     (fixes bug #31525).
   26 
   27   2010-07-12: Simon Goldschmidt (patch by Stephane Lesage)
   28   * ip.c, udp.c/.h, pbuf.h, sockets.c: task #10495: Added support for
   29     IP_MULTICAST_LOOP at socket- and raw-API level.
   30 
   31   2010-06-16: Simon Goldschmidt
   32   * ip.c: Added an optional define (LWIP_IP_ACCEPT_UDP_PORT) that can allow
   33     link-layer-addressed UDP traffic to be received while a netif is down (just
   34     like DHCP during configuration)
   35 
   36   2010-05-22: Simon Goldschmidt
   37   * many many files: bug #27352: removed packing from ip_addr_t, the packed
   38     version is now only used in protocol headers. Added global storage for
   39     current src/dest IP address while in input functions.
   40 
   41   2010-05-16: Simon Goldschmidt
   42   * def.h: task #10391: Add preprocessor-macros for compile-time htonl
   43     calculation (and use them throughout the stack where applicable)
   44 
   45   2010-05-16: Simon Goldschmidt
   46   * opt.h, memp_std.h, memp.c, ppp_oe.h/.c: PPPoE now uses its own MEMP pool
   47     instead of the heap (moved struct pppoe_softc from ppp_oe.c to ppp_oe.h)
   48 
   49   2010-05-16: Simon Goldschmidt
   50   * opt.h, memp_std.h, dns.h/.c: DNS_LOCAL_HOSTLIST_IS_DYNAMIC uses its own
   51     MEMP pool instead of the heap
   52 
   53   2010-05-13: Simon Goldschmidt
   54   * tcp.c, udp.c: task #6995: Implement SO_REUSEADDR (correctly), added
   55     new option SO_REUSE_RXTOALL to pass received UDP broadcast/multicast
   56     packets to more than one pcb.
   57 
   58   2010-05-02: Simon Goldschmidt
   59   * netbuf.h/.c, sockets.c, api_msg.c: use checksum-on-copy for sending
   60     UDP data for LWIP_NETIF_TX_SINGLE_PBUF==1
   61 
   62   2010-04-30: Simon Goldschmidt
   63   * udp.h/.c, pbuf.h/.c: task #6849: added udp_send(_to/_if) functions that
   64     take a precalculated checksum, added pbuf_fill_chksum() to copy data
   65     into a pbuf and at the same time calculating the checksum for that data
   66 
   67   2010-04-29: Simon Goldschmidt
   68   * ip_addr.h, etharp.h/.c, autoip.c: Create overridable macros for copying
   69     2-byte-aligned IP addresses and MAC addresses
   70 
   71   2010-04-28: Patch by Bill Auerbach
   72   * ip.c: Inline generating IP checksum to save a function call
   73 
   74   2010-04-14: Simon Goldschmidt
   75   * tcpip.h/.c, timers.c: Added an overridable define to get informed when the
   76     tcpip_thread processes messages or timeouts to implement a watchdog.
   77 
   78   2010-03-28: Simon Goldschmidt
   79   * ip_frag.c: create a new (contiguous) PBUF_RAM for every outgoing
   80     fragment if LWIP_NETIF_TX_SINGLE_PBUF==1
   81 
   82   2010-03-27: Simon Goldschmidt
   83   * etharp.c: Speedup TX by moving code from find_entry to etharp_output/
   84     etharp_query to prevent unnecessary function calls (inspired by
   85     patch #7135).
   86 
   87   2010-03-20: Simon Goldschmidt
   88   * opt.h, tcpip.c/.h: Added an option to disable tcpip_(un)timeout code
   89     since the linker cannot do this automatically to save space.
   90 
   91   2010-03-20: Simon Goldschmidt
   92   * opt.h, etharp.c/.h: Added support for static ARP table entries
   93 
   94   2010-03-14: Simon Goldschmidt
   95   * tcp_impl.h, tcp_out.c, inet_chksum.h/.c: task #6849: Calculate checksum
   96     when creating TCP segments, not when (re-)transmitting them.
   97 
   98   2010-03-07: Simon Goldschmidt
   99   * sockets.c: bug #28775 (select/event_callback: only check select_cb_list
  100     on change) plus use SYS_LIGHTWEIGHT_PROT to protect the select code.
  101     This should speed up receiving data on sockets as the select code in
  102     event_callback is only executed when select is waiting.
  103 
  104   2010-03-06: Simon Goldschmidt
  105   * tcp_out.c: task #7013 (Create option to have all packets delivered to
  106     netif->output in one piece): Always copy to try to create single pbufs
  107     in tcp_write.
  108 
  109   2010-03-06: Simon Goldschmidt
  110   * api.h, api_lib.c, sockets.c: task #10167 (sockets: speed up TCP recv
  111     by not allocating a netbuf): added function netconn_recv_tcp_pbuf()
  112     for tcp netconns to receive pbufs, not netbufs; use that function
  113     for tcp sockets.
  114 
  115   2010-03-05: Jakob Ole Stoklundsen / Simon Goldschmidt
  116   * opt.h, tcp.h, tcp_impl.h, tcp.c, tcp_in.c, tcp_out.c: task #7040:
  117     Work on tcp_enqueue: Don't waste memory when chaining segments,
  118     added option TCP_OVERSIZE to prevent creating many small pbufs when
  119     calling tcp_write with many small blocks of data. Instead, pbufs are
  120     allocated larger than needed and the space is used for later calls to
  121     tcp_write.
  122 
  123   2010-02-21: Simon Goldschmidt
  124   * stats.c/.h: Added const char* name to mem- and memp-stats for easier
  125     debugging.
  126 
  127   2010-02-21: Simon Goldschmidt
  128   * tcp.h (and usages), added tcp_impl.h: Splitted API and internal
  129     implementation of tcp to make API usage cleare to application programmers
  130 
  131   2010-02-14: Simon Goldschmidt/Stephane Lesage
  132   * ip_addr.h: Improved some defines working on ip addresses, added faster
  133     macro to copy addresses that cannot be NULL
  134 
  135   2010-02-13: Simon Goldschmidt
  136   * api.h, api_lib.c, api_msg.c, sockets.c: task #7865 (implement non-
  137     blocking send operation)
  138 
  139   2010-02-12: Simon Goldschmidt
  140   * sockets.c/.h: Added a minimal version of posix fctl() to have a
  141     standardised way to set O_NONBLOCK for nonblocking sockets.
  142 
  143   2010-02-12: Simon Goldschmidt
  144   * dhcp.c/.h, autoip.c/.h: task #10139 (Prefer statically allocated
  145     memory): added autoip_set_struct() and dhcp_set_struct() to let autoip
  146     and dhcp work with user-allocated structs instead of callin mem_malloc
  147 
  148   2010-02-12: Simon Goldschmidt/Jeff Barber
  149   * tcp.c/h: patch #6865 (SO_REUSEADDR for TCP): if pcb.so_options has
  150     SOF_REUSEADDR set, allow binding to endpoint in TIME_WAIT
  151 
  152   2010-02-12: Simon Goldschmidt
  153   * sys layer: task #10139 (Prefer statically allocated memory): converted
  154     mbox and semaphore functions to take pointers to sys_mbox_t/sys_sem_t;
  155     converted sys_mbox_new/sys_sem_new to take pointers and return err_t;
  156     task #7212: Add Mutex concept in sys_arch (define LWIP_COMPAT_MUTEX
  157     to let sys.h use binary semaphores instead of mutexes - as before)
  158 
  159   2010-02-09: Simon Goldschmidt (Simon Kallweit)
  160   * timers.c/.h: Added function sys_restart_timeouts() from patch #7085
  161     (Restart system timeout handling)
  162 
  163   2010-02-09: Simon Goldschmidt
  164   * netif.c/.h, removed loopif.c/.h: task #10153 (Integrate loopif into
  165     netif.c) - loopif does not have to be created by the port any more,
  166     just define LWIP_HAVE_LOOPIF to 1.
  167 
  168   2010-02-08: Simon Goldschmidt
  169   * inet.h, ip_addr.c/.h: Added reentrant versions of inet_ntoa/ipaddr_ntoa
  170     inet_ntoa_r/ipaddr_ntoa_r
  171 
  172   2010-02-08: Simon Goldschmidt
  173   * netif.h: Added netif_s/get_igmp_mac_filter() macros
  174 
  175   2010-02-05: Simon Goldschmidt
  176   * netif.h: Added function-like macros to get/set the hostname on a netif
  177 
  178   2010-02-04: Simon Goldschmidt
  179   * nearly every file: Replaced struct ip_addr by typedef ip_addr_t to
  180     make changing the actual implementation behind the typedef easier.
  181 
  182   2010-02-01: Simon Goldschmidt
  183   * opt.h, memp_std.h, dns.h, netdb.c, memp.c: Let netdb use a memp pool
  184     for allocating memory when getaddrinfo() is called.
  185 
  186   2010-01-31: Simon Goldschmidt
  187   * dhcp.h, dhcp.c: Reworked the code that parses DHCP options: parse
  188     them once instead of parsing for every option. This also removes
  189     the need for mem_malloc from dhcp_recv and makes it possible to
  190     correctly retrieve the BOOTP file.
  191 
  192   2010-01-30: simon Goldschmidt
  193   * sockets.c: Use SYS_LIGHTWEIGHT_PROT instead of a semaphore to protect
  194     the sockets array.
  195 
  196   2010-01-29: Simon Goldschmidt (patch by Laura Garrett)
  197   * api.h, api_msg.c, sockets.c: Added except set support in select
  198     (patch #6860)
  199 
  200   2010-01-29: Simon Goldschmidt (patch by Laura Garrett)
  201   * api.h, sockets.h, err.h, api_lib.c, api_msg.c, sockets.c, err.c:
  202     Add non-blocking support for connect (partly from patch #6860),
  203     plus many cleanups in socket & netconn API.
  204 
  205   2010-01-27: Simon Goldschmidt
  206   * opt.h, tcp.h, init.c, api_msg.c: Added TCP_SNDQUEUELOWAT corresponding
  207     to TCP_SNDLOWAT and added tcp_sndqueuelen() - this fixes bug #28605
  208 
  209   2010-01-26: Simon Goldschmidt
  210   * snmp: Use memp pools for snmp instead of the heap; added 4 new pools.
  211 
  212   2010-01-14: Simon Goldschmidt
  213   * ppp.c/.h: Fixed bug #27856: PPP: Set netif link- and status-callback
  214     by adding ppp_set_netif_statuscallback()/ppp_set_netif_linkcallback()
  215 
  216   2010-01-13: Simon Goldschmidt
  217   * mem.c: The heap now may be moved to user-defined memory by defining
  218     LWIP_RAM_HEAP_POINTER as a void pointer to that memory's address
  219     (patch #6966 and bug #26133)
  220 
  221   2010-01-10: Simon Goldschmidt (Bill Auerbach)
  222   * opt.h, memp.c: patch #6822 (Add option to place memory pools in
  223     separate arrays)
  224 
  225   2010-01-10: Simon Goldschmidt
  226   * init.c, igmp.c: patch #6463 (IGMP - Adding Random Delay): added define
  227     LWIP_RAND() for lwip-wide randomization (to be defined in cc.h)
  228 
  229   2009-12-31: Simon Goldschmidt
  230   * tcpip.c, init.c, memp.c, sys.c, memp_std.h, sys.h, tcpip.h
  231     added timers.c/.h: Separated timer implementation from semaphore/mbox
  232     implementation, moved timer implementation to timers.c/.h, timers are
  233     now only called from tcpip_thread or by explicitly checking them.
  234     (TASK#7235)
  235 
  236   2009-12-27: Simon Goldschmidt
  237   * opt.h, etharp.h/.c, init.c, tcpip.c: Added an additional option
  238     LWIP_ETHERNET to support ethernet without ARP (necessary for pure PPPoE)
  239 
  240 
  241   ++ Bugfixes:
  242 
  243   2011-04-20: Simon Goldschmidt
  244   * sys_arch.txt: sys_arch_timeouts() is not needed any more.
  245 
  246   2011-04-13: Simon Goldschmidt
  247   * tcp.c, udp.c: Fixed bug #33048 (Bad range for IP source port numbers) by
  248     using ports in the IANA private/dynamic range (49152 through 65535).
  249 
  250   2011-03-29: Simon Goldschmidt, patch by Emil Lhungdahl:
  251   * etharp.h/.c: Fixed broken VLAN support.
  252 
  253   2011-03-27: Simon Goldschmidt
  254   * tcp.c: Fixed bug #32926 (TCP_RMV(&tcp_bound_pcbs) is called on unbound tcp
  255     pcbs) by checking if the pcb was bound (local_port != 0).
  256 
  257   2011-03-27: Simon Goldschmidt
  258   * ppp.c: Fixed bug #32280 (ppp: a pbuf is freed twice)
  259 
  260   2011-03-27: Simon Goldschmidt
  261   * sockets.c: Fixed bug #32906: lwip_connect+lwip_send did not work for udp and
  262     raw pcbs with LWIP_TCPIP_CORE_LOCKING==1.
  263   
  264   2011-03-27: Simon Goldschmidt
  265   * tcp_out.c: Fixed bug #32820 (Outgoing TCP connections created before route
  266     is present never times out) by starting retransmission timer before checking
  267     route.
  268 
  269   2011-03-22: Simon Goldschmidt
  270   * ppp.c: Fixed bug #32648 (PPP code crashes when terminating a link) by only
  271     calling sio_read_abort() if the file descriptor is valid.
  272 
  273   2011-03-14: Simon Goldschmidt
  274   * err.h/.c, sockets.c, api_msg.c: fixed bug #31748 (Calling non-blocking connect
  275     more than once can render a socket useless) since it mainly involves changing
  276     "FATAL" classification of error codes: ERR_USE and ERR_ISCONN just aren't fatal.
  277 
  278   2011-03-13: Simon Goldschmidt
  279   * sockets.c: fixed bug #32769 (ESHUTDOWN is linux-specific) by fixing
  280     err_to_errno_table (ERR_CLSD: ENOTCONN instead of ESHUTDOWN), ERR_ISCONN:
  281     use EALRADY instead of -1
  282 
  283   2011-03-13: Simon Goldschmidt
  284   * api_lib.c: netconn_accept: return ERR_ABRT instead of ERR_CLSD if the
  285     connection has been aborted by err_tcp (since this is not a normal closing
  286     procedure).
  287 
  288   2011-03-13: Simon Goldschmidt
  289   * tcp.c: tcp_bind: return ERR_VAL instead of ERR_ISCONN when trying to bind
  290     with pcb->state != CLOSED
  291 
  292   2011-02-17: Simon Goldschmidt
  293   * rawapi.txt: Fixed bug #32561 tcp_poll argument definition out-of-order in
  294     documentation
  295 
  296   2011-02-17: Simon Goldschmidt
  297   * many files: Added missing U/UL modifiers to fix 16-bit-arch portability.
  298 
  299   2011-01-24: Simon Goldschmidt
  300   * sockets.c: Fixed bug #31741: lwip_select seems to have threading problems
  301 
  302   2010-12-02: Simon Goldschmidt
  303   * err.h: Fixed ERR_IS_FATAL so that ERR_WOULDBLOCK is not fatal.
  304 
  305   2010-11-23: Simon Goldschmidt
  306   * api.h, api_lib.c, api_msg.c, sockets.c: netconn.recv_avail is only used for
  307     LWIP_SO_RCVBUF and ioctl/FIONREAD.
  308 
  309   2010-11-23: Simon Goldschmidt
  310   * etharp.c: Fixed bug #31720: ARP-queueing: RFC 1122 recommends to queue at
  311     least 1 packet -> ARP_QUEUEING==0 now queues the most recent packet.
  312 
  313   2010-11-23: Simon Goldschmidt
  314   * tcp_in.c: Fixed bug #30577: tcp_input: don't discard ACK-only packets after
  315     refusing 'refused_data' again.
  316   
  317   2010-11-22: Simon Goldschmidt
  318   * sockets.c: Fixed bug #31590: getsockopt(... SO_ERROR ...) gives EINPROGRESS
  319     after a successful nonblocking connection.
  320 
  321   2010-11-22: Simon Goldschmidt
  322   * etharp.c: Fixed bug #31722: IP packets sent with an AutoIP source addr
  323     must be sent link-local
  324 
  325   2010-11-22: Simon Goldschmidt
  326   * timers.c: patch #7329: tcp_timer_needed prototype was ifdef'ed out for
  327     LWIP_TIMERS==0
  328 
  329   2010-11-20: Simon Goldschmidt
  330   * sockets.c: Fixed bug #31170: lwip_setsockopt() does not set socket number
  331 
  332   2010-11-20: Simon Goldschmidt
  333   * sockets.h: Fixed bug #31304: Changed SHUT_RD, SHUT_WR and SHUT_RDWR to
  334     resemble other stacks.
  335 
  336   2010-11-20: Simon Goldschmidt
  337   * dns.c: Fixed bug #31535: TCP_SND_QUEUELEN must be at least 2 or else
  338     no-copy TCP writes will never succeed.
  339 
  340   2010-11-20: Simon Goldschmidt
  341   * dns.c: Fixed bug #31701: Error return value from dns_gethostbyname() does
  342     not match documentation: return ERR_ARG instead of ERR_VAL if not
  343     initialized or wrong argument.
  344 
  345   2010-10-20: Simon Goldschmidt
  346   * sockets.h: Fixed bug #31385: sizeof(struct sockaddr) is 30 but should be 16
  347 
  348   2010-10-05: Simon Goldschmidt
  349   * dhcp.c: Once again fixed #30038: DHCP/AutoIP cooperation failed when
  350     replugging the network cable after an AutoIP address was assigned.
  351 
  352   2010-08-10: Simon Goldschmidt
  353   * tcp.c: Fixed bug #30728: tcp_new_port() did not check listen pcbs
  354 
  355   2010-08-03: Simon Goldschmidt
  356   * udp.c, raw.c: Don't chain empty pbufs when sending them (fixes bug #30625)
  357 
  358   2010-08-01: Simon Goldschmidt (patch by Greg Renda)
  359   * ppp.c: Applied patch #7264 (PPP protocols are rejected incorrectly on big
  360     endian architectures)
  361   
  362   2010-07-28: Simon Goldschmidt
  363   * api_lib.c, api_msg.c, sockets.c, mib2.c: Fixed compilation with TCP or UDP
  364     disabled.
  365   
  366   2010-07-27: Simon Goldschmidt
  367   * tcp.c: Fixed bug #30565 (tcp_connect() check bound list): that check did no
  368     harm but never did anything
  369   
  370   2010-07-21: Simon Goldschmidt
  371   * ip.c: Fixed invalid fix for bug #30402 (CHECKSUM_GEN_IP_INLINE does not
  372     add IP options)
  373 
  374   2010-07-16: Kieran Mansley
  375   * msg_in.c: Fixed SNMP ASN constant defines to not use ! operator 
  376 
  377   2010-07-10: Simon Goldschmidt
  378   * ip.c: Fixed bug #30402: CHECKSUM_GEN_IP_INLINE does not add IP options
  379 
  380   2010-06-30: Simon Goldschmidt
  381   * api_msg.c: fixed bug #30300 (shutdown parameter was not initialized in
  382     netconn_delete)
  383 
  384   2010-06-28: Kieran Mansley
  385   * timers.c remove unportable printing of C function pointers
  386 
  387   2010-06-24: Simon Goldschmidt
  388   * init.c, timers.c/.h, opt.h, memp_std.h: From patch #7221: added flag
  389     NO_SYS_NO_TIMERS to drop timer support for NO_SYS==1 for easier upgrading
  390 
  391   2010-06-24: Simon Goldschmidt
  392   * api(_lib).c/.h, api_msg.c/.h, sockets.c/.h: Fixed bug #10088: Correctly
  393     implemented shutdown at socket level.
  394 
  395   2010-06-21: Simon Goldschmidt
  396   * pbuf.c/.h, ip_frag.c/.h, opt.h, memp_std.h: Fixed bug #29361 (ip_frag has
  397     problems with zero-copy DMA MACs) by adding custom pbufs and implementing
  398     custom pbufs that reference other (original) pbufs. Additionally set
  399     IP_FRAG_USES_STATIC_BUF=0 as default to be on the safe side.
  400 
  401   2010-06-15: Simon Goldschmidt
  402   * dhcp.c: Fixed bug #29970: DHCP endian issue parsing option responses
  403 
  404   2010-06-14: Simon Goldschmidt
  405   * autoip.c: Fixed bug #30039: AutoIP does not reuse previous addresses
  406 
  407   2010-06-12: Simon Goldschmidt
  408   * dhcp.c: Fixed bug #30038: dhcp_network_changed doesn't reset AUTOIP coop
  409     state
  410 
  411   2010-05-17: Simon Goldschmidt
  412   * netdb.c: Correctly NULL-terminate h_addr_list
  413 
  414   2010-05-16: Simon Goldschmidt
  415   * def.h/.c: changed the semantics of LWIP_PREFIX_BYTEORDER_FUNCS to prevent
  416     "symbol already defined" i.e. when linking to winsock
  417 
  418   2010-05-05: Simon Goldschmidt
  419   * def.h, timers.c: Fixed bug #29769 (sys_check_timeouts: sys_now() may
  420     overflow)
  421 
  422   2010-04-21: Simon Goldschmidt
  423   * api_msg.c: Fixed bug #29617 (sometime cause stall on delete listening
  424     connection)
  425 
  426   2010-03-28: Luca Ceresoli
  427   * ip_addr.c/.h: patch #7143: Add a few missing const qualifiers
  428 
  429   2010-03-27: Luca Ceresoli
  430   * mib2.c: patch #7130: remove meaningless const qualifiers
  431 
  432   2010-03-26: Simon Goldschmidt
  433   * tcp_out.c: Make LWIP_NETIF_TX_SINGLE_PBUF work for TCP, too
  434 
  435   2010-03-26: Simon Goldschmidt
  436   * various files: Fixed compiling with different options disabled (TCP/UDP),
  437     triggered by bug #29345; don't allocate acceptmbox if LWIP_TCP is disabled
  438 
  439   2010-03-25: Simon Goldschmidt
  440   * sockets.c: Fixed bug #29332: lwip_select() processes readset incorrectly
  441 
  442   2010-03-25: Simon Goldschmidt
  443   * tcp_in.c, test_tcp_oos.c: Fixed bug #29080: Correctly handle remote side
  444     overrunning our rcv_wnd in ooseq case.
  445 
  446   2010-03-22: Simon Goldschmidt
  447   * tcp.c: tcp_listen() did not copy the pcb's prio.
  448 
  449   2010-03-19: Simon Goldschmidt
  450   * snmp_msg.c: Fixed bug #29256: SNMP Trap address was not correctly set
  451 
  452   2010-03-14: Simon Goldschmidt
  453   * opt.h, etharp.h: Fixed bug #29148 (Incorrect PBUF_POOL_BUFSIZE for ports
  454     where ETH_PAD_SIZE > 0) by moving definition of ETH_PAD_SIZE to opt.h
  455     and basing PBUF_LINK_HLEN on it.
  456 
  457   2010-03-08: Simon Goldschmidt
  458   * netif.c, ipv4/ip.c: task #10241 (AutoIP: don't break existing connections
  459     when assiging routable address): when checking incoming packets and
  460     aborting existing connection on address change, filter out link-local
  461     addresses.
  462 
  463   2010-03-06: Simon Goldschmidt
  464   * sockets.c: Fixed LWIP_NETIF_TX_SINGLE_PBUF for LWIP_TCPIP_CORE_LOCKING
  465 
  466   2010-03-06: Simon Goldschmidt
  467   * ipv4/ip.c: Don't try to forward link-local addresses
  468 
  469   2010-03-06: Simon Goldschmidt
  470   * etharp.c: Fixed bug #29087: etharp: don't send packets for LinkLocal-
  471     addresses to gw
  472 
  473   2010-03-05: Simon Goldschmidt
  474   * dhcp.c: Fixed bug #29072: Correctly set ciaddr based on message-type
  475     and state.
  476 
  477   2010-03-05: Simon Goldschmidt
  478   * api_msg.c: Correctly set TCP_WRITE_FLAG_MORE when netconn_write is split
  479     into multiple calls to tcp_write.    
  480 
  481   2010-02-21: Simon Goldschmidt
  482   * opt.h, mem.h, dns.c: task #10140: Remove DNS_USES_STATIC_BUF (keep
  483     the implementation of DNS_USES_STATIC_BUF==1)
  484 
  485   2010-02-20: Simon Goldschmidt
  486   * tcp.h, tcp.c, tcp_in.c, tcp_out.c: Task #10088: Correctly implement
  487     close() vs. shutdown(). Now the application does not get any more
  488     recv callbacks after calling tcp_close(). Added tcp_shutdown().
  489 
  490   2010-02-19: Simon Goldschmidt
  491   * mem.c/.h, pbuf.c: Renamed mem_realloc() to mem_trim() to prevent
  492     confusion with realloc()
  493 
  494   2010-02-15: Simon Goldschmidt/Stephane Lesage
  495   * netif.c/.h: Link status does not depend on LWIP_NETIF_LINK_CALLBACK
  496     (fixes bug #28899)
  497 
  498   2010-02-14: Simon Goldschmidt
  499   * netif.c: Fixed bug #28877 (Duplicate ARP gratuitous packet with
  500     LWIP_NETIF_LINK_CALLBACK set on) by only sending if both link- and
  501     admin-status of a netif are up
  502 
  503   2010-02-14: Simon Goldschmidt
  504   * opt.h: Disable ETHARP_TRUST_IP_MAC by default since it slows down packet
  505     reception and is not really necessary
  506 
  507   2010-02-14: Simon Goldschmidt
  508   * etharp.c/.h: Fixed ARP input processing: only add a new entry if a
  509     request was directed as us (RFC 826, Packet Reception), otherwise
  510     only update existing entries; internalized some functions
  511 
  512   2010-02-14: Simon Goldschmidt
  513   * netif.h, etharp.c, tcpip.c: Fixed bug #28183 (ARP and TCP/IP cannot be
  514     disabled on netif used for PPPoE) by adding a new netif flag
  515     (NETIF_FLAG_ETHERNET) that tells the stack the device is an ethernet
  516     device but prevents usage of ARP (so that ethernet_input can be used
  517     for PPPoE).
  518 
  519   2010-02-12: Simon Goldschmidt
  520   * netif.c: netif_set_link_up/down: only do something if the link state
  521     actually changes
  522 
  523   2010-02-12: Simon Goldschmidt/Stephane Lesage
  524   * api_msg.c: Fixed bug #28865 (Cannot close socket/netconn in non-blocking
  525     connect)
  526 
  527   2010-02-12: Simon Goldschmidt
  528   * mem.h: Fixed bug #28866 (mem_realloc function defined in mem.h)
  529 
  530   2010-02-09: Simon Goldschmidt
  531   * api_lib.c, api_msg.c, sockets.c, api.h, api_msg.h: Fixed bug #22110
  532    (recv() makes receive window update for data that wasn't received by
  533     application)
  534 
  535   2010-02-09: Simon Goldschmidt/Stephane Lesage
  536   * sockets.c: Fixed bug #28853 (lwip_recvfrom() returns 0 on receive time-out
  537     or any netconn_recv() error)
  538 
  539   2010-02-09: Simon Goldschmidt
  540   * ppp.c: task #10154 (PPP: Update snmp in/out counters for tx/rx packets)
  541 
  542   2010-02-09: Simon Goldschmidt
  543   * netif.c: For loopback packets, adjust the stats- and snmp-counters
  544     for the loopback netif.
  545 
  546   2010-02-08: Simon Goldschmidt
  547   * igmp.c/.h, ip.h: Moved most defines from igmp.h to igmp.c for clarity
  548     since they are not used anywhere else.
  549 
  550   2010-02-08: Simon Goldschmidt (Stéphane Lesage)
  551   * igmp.c, igmp.h, stats.c, stats.h: Improved IGMP stats
  552     (patch from bug #28798)
  553 
  554   2010-02-08: Simon Goldschmidt (Stéphane Lesage)
  555   * igmp.c: Fixed bug #28798 (Error in "Max Response Time" processing) and
  556     another bug when LWIP_RAND() returns zero.
  557 
  558   2010-02-04: Simon Goldschmidt
  559   * nearly every file: Use macros defined in ip_addr.h (some of them new)
  560     to work with IP addresses (preparation for bug #27352 - Change ip_addr
  561     from struct to typedef (u32_t) - and better code).
  562 
  563   2010-01-31: Simon Goldschmidt
  564   * netif.c: Don't call the link-callback from netif_set_up/down() since
  565     this invalidly retriggers DHCP.
  566 
  567   2010-01-29: Simon Goldschmidt
  568   * ip_addr.h, inet.h, def.h, inet.c, def.c, more: Cleanly separate the
  569     portability file inet.h and its contents from the stack: moved htonX-
  570     functions to def.h (and the new def.c - they are not ipv4 dependent),
  571     let inet.h depend on ip_addr.h and not the other way round.
  572     This fixes bug #28732.
  573 
  574   2010-01-28: Kieran Mansley
  575   * tcp.c: Ensure ssthresh >= 2*MSS
  576 
  577   2010-01-27: Simon Goldschmidt
  578   * tcp.h, tcp.c, tcp_in.c: Fixed bug #27871: Calling tcp_abort() in recv
  579     callback can lead to accessing unallocated memory. As a consequence,
  580     ERR_ABRT means the application has called tcp_abort()!
  581 
  582   2010-01-25: Simon Goldschmidt
  583   * snmp_structs.h, msg_in.c: Partly fixed bug #22070 (MIB_OBJECT_WRITE_ONLY
  584     not implemented in SNMP): write-only or not-accessible are still
  585     returned by getnext (though not by get)
  586 
  587   2010-01-24: Simon Goldschmidt
  588   * snmp: Renamed the private mib node from 'private' to 'mib_private' to
  589     not use reserved C/C++ keywords
  590 
  591   2010-01-23: Simon Goldschmidt
  592   * sockets.c: Fixed bug #28716: select() returns 0 after waiting for less
  593     than 1 ms
  594 
  595   2010-01-21: Simon Goldschmidt
  596   * tcp.c, api_msg.c: Fixed bug #28651 (tcp_connect: no callbacks called
  597     if tcp_enqueue fails) both in raw- and netconn-API
  598 
  599   2010-01-19: Simon Goldschmidt
  600   * api_msg.c: Fixed bug #27316: netconn: Possible deadlock in err_tcp
  601 
  602   2010-01-18: Iordan Neshev/Simon Goldschmidt
  603   * src/netif/ppp: reorganised PPP sourcecode to 2.3.11 including some
  604     bugfix backports from 2.4.x.
  605 
  606   2010-01-18: Simon Goldschmidt
  607   * mem.c: Fixed bug #28679: mem_realloc calculates mem_stats wrong
  608 
  609   2010-01-17: Simon Goldschmidt
  610   * api_lib.c, api_msg.c, (api_msg.h, api.h, sockets.c, tcpip.c):
  611     task #10102: "netconn: clean up conn->err threading issues" by adding
  612     error return value to struct api_msg_msg
  613 
  614   2010-01-17: Simon Goldschmidt
  615   * api.h, api_lib.c, sockets.c: Changed netconn_recv() and netconn_accept()
  616     to return err_t (bugs #27709 and #28087)
  617 
  618   2010-01-14: Simon Goldschmidt
  619   * ...: Use typedef for function prototypes throughout the stack.
  620 
  621   2010-01-13: Simon Goldschmidt
  622   * api_msg.h/.c, api_lib.c: Fixed bug #26672 (close connection when receive
  623     window = 0) by correctly draining recvmbox/acceptmbox
  624 
  625   2010-01-11: Simon Goldschmidt
  626   * pap.c: Fixed bug #13315 (PPP PAP authentication can result in
  627     erroneous callbacks) by copying the code from recent pppd
  628 
  629   2010-01-10: Simon Goldschmidt
  630   * raw.c: Fixed bug #28506 (raw_bind should filter received packets)
  631 
  632   2010-01-10: Simon Goldschmidt
  633   * tcp.h/.c: bug #28127 (remove call to tcp_output() from tcp_ack(_now)())
  634 
  635   2010-01-08: Simon Goldschmidt
  636   * sockets.c: Fixed bug #28519 (lwip_recvfrom bug with len > 65535)
  637 
  638   2010-01-08: Simon Goldschmidt
  639   * dns.c: Copy hostname for DNS_LOCAL_HOSTLIST_IS_DYNAMIC==1 since string
  640     passed to dns_local_addhost() might be volatile
  641 
  642   2010-01-07: Simon Goldschmidt
  643   * timers.c, tcp.h: Call tcp_timer_needed() with NO_SYS==1, too
  644 
  645   2010-01-06: Simon Goldschmidt
  646   * netdb.h: Fixed bug #28496: missing include guards in netdb.h
  647 
  648   2009-12-31: Simon Goldschmidt
  649   * many ppp files: Reorganised PPP source code from ucip structure to pppd
  650     structure to easily compare our code against the pppd code (around v2.3.1)
  651 
  652   2009-12-27: Simon Goldschmidt
  653   * tcp_in.c: Another fix for bug #28241 (ooseq processing) and adapted
  654     unit test
  655 
  656 
  657 (STABLE-1.3.2)
  658 
  659   ++ New features:
  660 
  661   2009-10-27 Simon Goldschmidt/Stephan Lesage
  662   * netifapi.c/.h: Added netifapi_netif_set_addr()
  663 
  664   2009-10-07 Simon Goldschmidt/Fabian Koch
  665   * api_msg.c, netbuf.c/.h, opt.h: patch #6888: Patch for UDP Netbufs to
  666     support dest-addr and dest-port (optional: LWIP_NETBUF_RECVINFO)
  667 
  668   2009-08-26 Simon Goldschmidt/Simon Kallweit
  669   * slipif.c/.h: bug #26397: SLIP polling support
  670 
  671   2009-08-25 Simon Goldschmidt
  672   * opt.h, etharp.h/.c: task #9033: Support IEEE 802.1q tagged frame (VLAN),
  673     New configuration options ETHARP_SUPPORT_VLAN and ETHARP_VLAN_CHECK.
  674 
  675   2009-08-25 Simon Goldschmidt
  676   * ip_addr.h, netdb.c: patch #6900: added define ip_ntoa(struct ip_addr*)
  677 
  678   2009-08-24 Jakob Stoklund Olesen
  679   * autoip.c, dhcp.c, netif.c: patch #6725: Teach AutoIP and DHCP to respond
  680     to netif_set_link_up().
  681 
  682   2009-08-23 Simon Goldschmidt
  683   * tcp.h/.c: Added function tcp_debug_state_str() to convert a tcp state
  684     to a human-readable string.
  685 
  686   ++ Bugfixes:
  687 
  688   2009-12-24: Kieran Mansley
  689   * tcp_in.c Apply patches from Oleg Tyshev to improve OOS processing
  690     (BUG#28241)
  691 
  692   2009-12-06: Simon Goldschmidt
  693   * ppp.h/.c: Fixed bug #27079 (Yet another leak in PPP): outpacket_buf can
  694     be statically allocated (like in ucip)
  695 
  696   2009-12-04: Simon Goldschmidt (patch by Ioardan Neshev)
  697   * pap.c: patch #6969: PPP: missing PAP authentication UNTIMEOUT
  698 
  699   2009-12-03: Simon Goldschmidt
  700   * tcp.h, tcp_in.c, tcp_out.c: Fixed bug #28106: dup ack for fast retransmit
  701     could have non-zero length
  702 
  703   2009-12-02: Simon Goldschmidt
  704   * tcp_in.c: Fixed bug #27904: TCP sends too many ACKs: delay resetting
  705     tcp_input_pcb until after calling the pcb's callbacks
  706 
  707   2009-11-29: Simon Goldschmidt
  708   * tcp_in.c: Fixed bug #28054: Two segments with FIN flag on the out-of-
  709     sequence queue, also fixed PBUF_POOL leak in the out-of-sequence code
  710 
  711   2009-11-29: Simon Goldschmidt
  712   * pbuf.c: Fixed bug #28064: pbuf_alloc(PBUF_POOL) is not thread-safe by
  713     queueing a call into tcpip_thread to free ooseq-bufs if the pool is empty
  714 
  715   2009-11-26: Simon Goldschmidt
  716   * tcp.h: Fixed bug #28098: Nagle can prevent fast retransmit from sending
  717     segment
  718 
  719   2009-11-26: Simon Goldschmidt
  720   * tcp.h, sockets.c: Fixed bug #28099: API required to disable Nagle
  721     algorithm at PCB level
  722 
  723   2009-11-22: Simon Goldschmidt
  724   * tcp_out.c: Fixed bug #27905: FIN isn't combined with data on unsent
  725 
  726   2009-11-22: Simon Goldschmidt (suggested by Bill Auerbach)
  727   * tcp.c: tcp_alloc: prevent increasing stats.err for MEMP_TCP_PCB when
  728     reusing time-wait pcb
  729 
  730   2009-11-20: Simon Goldschmidt (patch by Albert Bartel)
  731   * sockets.c: Fixed bug #28062: Data received directly after accepting
  732     does not wake up select
  733 
  734   2009-11-11: Simon Goldschmidt
  735   * netdb.h: Fixed bug #27994: incorrect define for freeaddrinfo(addrinfo)
  736 
  737   2009-10-30: Simon Goldschmidt
  738   * opt.h: Increased default value for TCP_MSS to 536, updated default
  739     value for TCP_WND to 4*TCP_MSS to keep delayed ACK working.
  740 
  741   2009-10-28: Kieran Mansley
  742   * tcp_in.c, tcp_out.c, tcp.h: re-work the fast retransmission code
  743     to follow algorithm from TCP/IP Illustrated
  744 
  745   2009-10-27: Kieran Mansley
  746   * tcp_in.c: fix BUG#27445: grow cwnd with every duplicate ACK
  747 
  748   2009-10-25: Simon Goldschmidt
  749   * tcp.h: bug-fix in the TCP_EVENT_RECV macro (has to call tcp_recved if
  750     pcb->recv is NULL to keep rcv_wnd correct)
  751 
  752   2009-10-25: Simon Goldschmidt
  753   * tcp_in.c: Fixed bug #26251: RST process in TIME_WAIT TCP state
  754 
  755   2009-10-23: Simon Goldschmidt (David Empson)
  756   * tcp.c: Fixed bug #27783: Silly window avoidance for small window sizes
  757 
  758   2009-10-21: Simon Goldschmidt
  759   * tcp_in.c: Fixed bug #27215: TCP sent() callback gives leading and
  760     trailing 1 byte len (SYN/FIN)
  761 
  762   2009-10-21: Simon Goldschmidt
  763   * tcp_out.c: Fixed bug #27315: zero window probe and FIN
  764 
  765   2009-10-19: Simon Goldschmidt
  766   * dhcp.c/.h: Minor code simplification (don't store received pbuf, change
  767     conditional code to assert where applicable), check pbuf length before
  768     testing for valid reply
  769 
  770   2009-10-19: Simon Goldschmidt
  771   * dhcp.c: Removed most calls to udp_connect since they aren't necessary
  772     when using udp_sendto_if() - always stay connected to IP_ADDR_ANY.
  773 
  774   2009-10-16: Simon Goldschmidt
  775   * ip.c: Fixed bug #27390: Source IP check in ip_input() causes it to drop
  776     valid DHCP packets -> allow 0.0.0.0 as source address when LWIP_DHCP is
  777     enabled
  778 
  779   2009-10-15: Simon Goldschmidt (Oleg Tyshev)
  780   * tcp_in.c: Fixed bug #27329: dupacks by unidirectional data transmit
  781 
  782   2009-10-15: Simon Goldschmidt
  783   * api_lib.c: Fixed bug #27709: conn->err race condition on netconn_recv()
  784     timeout
  785 
  786   2009-10-15: Simon Goldschmidt
  787   * autoip.c: Fixed bug #27704: autoip starts with wrong address
  788     LWIP_AUTOIP_CREATE_SEED_ADDR() returned address in host byte order instead
  789     of network byte order
  790 
  791   2009-10-11 Simon Goldschmidt (Jörg Kesten)
  792   * tcp_out.c: Fixed bug #27504: tcp_enqueue wrongly concatenates segments
  793     which are not consecutive when retransmitting unacked segments
  794 
  795   2009-10-09 Simon Goldschmidt
  796   * opt.h: Fixed default values of some stats to only be enabled if used
  797     Fixes bug #27338: sys_stats is defined when NO_SYS = 1
  798 
  799   2009-08-30 Simon Goldschmidt
  800   * ip.c: Fixed bug bug #27345: "ip_frag() does not use the LWIP_NETIF_LOOPBACK
  801     function" by checking for loopback before calling ip_frag
  802 
  803   2009-08-25 Simon Goldschmidt
  804   * dhcp.c: fixed invalid dependency to etharp_query if DHCP_DOES_ARP_CHECK==0
  805 
  806   2009-08-23 Simon Goldschmidt
  807   * ppp.c: bug #27078: Possible memory leak in pppInit()
  808 
  809   2009-08-23 Simon Goldschmidt
  810   * netdb.c, dns.c: bug #26657: DNS, if host name is "localhost", result
  811     is error.
  812 
  813   2009-08-23 Simon Goldschmidt
  814   * opt.h, init.c: bug #26649: TCP fails when TCP_MSS > TCP_SND_BUF
  815     Fixed wrong parenthesis, added check in init.c
  816 
  817   2009-08-23 Simon Goldschmidt
  818   * ppp.c: bug #27266: wait-state debug message in pppMain occurs every ms
  819 
  820   2009-08-23 Simon Goldschmidt
  821   * many ppp files: bug #27267: Added include to string.h where needed
  822 
  823   2009-08-23 Simon Goldschmidt
  824   * tcp.h: patch #6843: tcp.h macro optimization patch (for little endian)
  825 
  826 
  827 (STABLE-1.3.1)
  828 
  829   ++ New features:
  830 
  831   2009-05-10 Simon Goldschmidt
  832   * opt.h, sockets.c, pbuf.c, netbuf.h, pbuf.h: task #7013: Added option
  833     LWIP_NETIF_TX_SINGLE_PBUF to try to create transmit packets from only
  834     one pbuf to help MACs that don't support scatter-gather DMA.
  835 
  836   2009-05-09 Simon Goldschmidt
  837   * icmp.h, icmp.c: Shrinked ICMP code, added option to NOT check icoming
  838     ECHO pbuf for size (just use it): LWIP_ICMP_ECHO_CHECK_INPUT_PBUF_LEN
  839 
  840   2009-05-05 Simon Goldschmidt, Jakob Stoklund Olesen
  841   * ip.h, ip.c: Added ip_current_netif() & ip_current_header() to receive
  842     extended info about the currently received packet.
  843 
  844   2009-04-27 Simon Goldschmidt
  845   * sys.h: Made SYS_LIGHTWEIGHT_PROT and sys_now() work with NO_SYS=1
  846 
  847   2009-04-25 Simon Goldschmidt
  848   * mem.c, opt.h: Added option MEM_USE_POOLS_TRY_BIGGER_POOL to try the next
  849     bigger malloc pool if one is empty (only usable with MEM_USE_POOLS).
  850 
  851   2009-04-21 Simon Goldschmidt
  852   * dns.c, init.c, dns.h, opt.h: task #7507, patch #6786: DNS supports static
  853     hosts table. New configuration options DNS_LOCAL_HOSTLIST and
  854     DNS_LOCAL_HOSTLIST_IS_DYNAMIC. Also, DNS_LOOKUP_LOCAL_EXTERN() can be defined
  855     as an external function for lookup.
  856 
  857   2009-04-15 Simon Goldschmidt
  858   * dhcp.c: patch #6763: Global DHCP XID can be redefined to something more unique
  859 
  860   2009-03-31 Kieran Mansley
  861   * tcp.c, tcp_out.c, tcp_in.c, sys.h, tcp.h, opts.h: add support for
  862     TCP timestamp options, off by default.  Rework tcp_enqueue() to
  863     take option flags rather than specified option data
  864 
  865   2009-02-18 Simon Goldschmidt
  866   * cc.h: Added printf formatter for size_t: SZT_F
  867 
  868   2009-02-16 Simon Goldschmidt (patch by Rishi Khan)
  869   * icmp.c, opt.h: patch #6539: (configurable) response to broadcast- and multicast
  870     pings
  871 
  872   2009-02-12 Simon Goldschmidt
  873   * init.h: Added LWIP_VERSION to get the current version of the stack
  874 
  875   2009-02-11 Simon Goldschmidt (suggested by Gottfried Spitaler)
  876   * opt.h, memp.h/.c: added MEMP_MEM_MALLOC to use mem_malloc/mem_free instead
  877     of the pool allocator (can save code size with MEM_LIBC_MALLOC if libc-malloc
  878     is otherwise used)
  879 
  880   2009-01-28 Jonathan Larmour (suggested by Bill Bauerbach)
  881   * ipv4/inet_chksum.c, ipv4/lwip/inet_chksum.h: inet_chksum_pseudo_partial()
  882   is only used by UDPLITE at present, so conditionalise it.
  883 
  884   2008-12-03 Simon Goldschmidt (base on patch from Luca Ceresoli)
  885   * autoip.c: checked in (slightly modified) patch #6683: Customizable AUTOIP
  886     "seed" address. This should reduce AUTOIP conflicts if
  887     LWIP_AUTOIP_CREATE_SEED_ADDR is overridden.
  888 
  889   2008-10-02 Jonathan Larmour and Rishi Khan
  890   * sockets.c (lwip_accept): Return EWOULDBLOCK if would block on non-blocking
  891     socket.
  892 
  893   2008-06-30 Simon Goldschmidt
  894   * mem.c, opt.h, stats.h: fixed bug #21433: Calling mem_free/pbuf_free from
  895     interrupt context isn't safe: LWIP_ALLOW_MEM_FREE_FROM_OTHER_CONTEXT allows
  896     mem_free to run between mem_malloc iterations. Added illegal counter for
  897     mem stats.
  898 
  899   2008-06-27 Simon Goldschmidt
  900   * stats.h/.c, some other files: patch #6483: stats module improvement:
  901     Added defines to display each module's statistic individually, added stats
  902     defines for MEM, MEMP and SYS modules, removed (unused) rexmit counter.
  903 
  904   2008-06-17 Simon Goldschmidt
  905   * err.h: patch #6459: Made err_t overridable to use a more efficient type
  906     (define LWIP_ERR_T in cc.h)
  907 
  908   2008-06-17 Simon Goldschmidt
  909   * slipif.c: patch #6480: Added a configuration option for slipif for symmetry
  910     to loopif
  911 
  912   2008-06-17 Simon Goldschmidt (patch by Luca Ceresoli)
  913   * netif.c, loopif.c, ip.c, netif.h, loopif.h, opt.h: Checked in slightly
  914     modified version of patch # 6370: Moved loopif code to netif.c so that
  915     loopback traffic is supported on all netifs (all local IPs).
  916     Added option to limit loopback packets for each netifs.
  917 
  918 
  919   ++ Bugfixes:
  920   2009-08-12 Kieran Mansley
  921   * tcp_in.c, tcp.c: Fix bug #27209: handle trimming of segments when
  922     out of window or out of order properly
  923 
  924   2009-08-12 Kieran Mansley
  925   * tcp_in.c: Fix bug #27199: use snd_wl2 instead of snd_wl1
  926 
  927   2009-07-28 Simon Goldschmidt
  928   * mem.h: Fixed bug #27105: "realloc() cannot replace mem_realloc()"s
  929 
  930   2009-07-27 Kieran Mansley
  931   * api.h api_msg.h netdb.h sockets.h: add missing #include directives
  932 
  933   2009-07-09 Kieran Mansley
  934   * api_msg.c, sockets.c, api.h: BUG23240 use signed counters for
  935     recv_avail and don't increment counters until message successfully
  936     sent to mbox
  937 
  938   2009-06-25 Kieran Mansley
  939   * api_msg.c api.h: BUG26722: initialise netconn write variables 
  940     in netconn_alloc
  941 
  942   2009-06-25 Kieran Mansley
  943   * tcp.h: BUG26879: set ret value in TCP_EVENT macros when function is not set
  944 
  945   2009-06-25 Kieran Mansley
  946   * tcp.c, tcp_in.c, tcp_out.c, tcp.h: BUG26301 and BUG26267: correct
  947     simultaneous close behaviour, and make snd_nxt have the same meaning 
  948     as in the RFCs.
  949 
  950   2009-05-12 Simon Goldschmidt
  951   * etharp.h, etharp.c, netif.c: fixed bug #26507: "Gratuitous ARP depends on
  952     arp_table / uses etharp_query" by adding etharp_gratuitous()
  953 
  954   2009-05-12 Simon Goldschmidt
  955   * ip.h, ip.c, igmp.c: bug #26487: Added ip_output_if_opt that can add IP options
  956     to the IP header (used by igmp_ip_output_if)
  957 
  958   2009-05-06 Simon Goldschmidt
  959   * inet_chksum.c: On little endian architectures, use LWIP_PLATFORM_HTONS (if
  960     defined) for SWAP_BYTES_IN_WORD to speed up checksumming.
  961 
  962   2009-05-05 Simon Goldschmidt
  963   * sockets.c: bug #26405: Prematurely released semaphore causes lwip_select()
  964     to crash
  965 
  966   2009-05-04 Simon Goldschmidt
  967   * init.c: snmp was not initialized in lwip_init()
  968 
  969   2009-05-04 Frédéric Bernon
  970   * dhcp.c, netbios.c: Changes if IP_SOF_BROADCAST is enabled.
  971 
  972   2009-05-03 Simon Goldschmidt
  973   * tcp.h: bug #26349: Nagle algorithm doesn't send although segment is full
  974     (and unsent->next == NULL)
  975 
  976   2009-05-02 Simon Goldschmidt
  977   * tcpip.h, tcpip.c: fixed tcpip_untimeout (does not need the time, broken after
  978     1.3.0 in CVS only) - fixes compilation of ppp_oe.c
  979 
  980   2009-05-02 Simon Goldschmidt
  981   * msg_in.c: fixed bug #25636: SNMPSET value is ignored for integer fields
  982 
  983   2009-05-01 Simon Goldschmidt
  984   * pap.c: bug #21680: PPP upap_rauthnak() drops legal NAK packets
  985 
  986   2009-05-01 Simon Goldschmidt
  987   * ppp.c: bug #24228: Memory corruption with PPP and DHCP
  988 
  989   2009-04-29 Frédéric Bernon
  990   * raw.c, udp.c, init.c, opt.h, ip.h, sockets.h: bug #26309: Implement the
  991     SO(F)_BROADCAST filter for all API layers. Avoid the unindented reception
  992     of broadcast packets even when this option wasn't set. Port maintainers
  993     which want to enable this filter have to set IP_SOF_BROADCAST=1 in opt.h.
  994     If you want this option also filter broadcast on recv operations, you also
  995     have to set IP_SOF_BROADCAST_RECV=1 in opt.h.
  996 
  997   2009-04-28 Simon Goldschmidt, Jakob Stoklund Olesen
  998   * dhcp.c: patch #6721, bugs #25575, #25576: Some small fixes to DHCP and
  999     DHCP/AUTOIP cooperation
 1000 
 1001   2009-04-25 Simon Goldschmidt, Oleg Tyshev
 1002   * tcp_out.c: bug #24212: Deadlocked tcp_retransmit due to exceeded pcb->cwnd
 1003     Fixed by sorting the unsent and unacked queues (segments are inserted at the
 1004     right place in tcp_output and tcp_rexmit).
 1005 
 1006   2009-04-25 Simon Goldschmidt
 1007   * memp.c, mem.c, memp.h, mem_std.h: bug #26213 "Problem with memory allocation
 1008     when debugging": memp_sizes contained the wrong sizes (including sanity
 1009     regions); memp pools for MEM_USE_POOLS were too small
 1010 
 1011   2009-04-24 Simon Goldschmidt, Frédéric Bernon
 1012   * inet.c: patch #6765: Fix a small problem with the last changes (incorrect
 1013     behavior, with with ip address string not ended by a '\0', a space or a
 1014     end of line)
 1015 
 1016   2009-04-19 Simon Goldschmidt
 1017   * rawapi.txt: Fixed bug #26069: Corrected documentation: if tcp_connect fails,
 1018     pcb->err is called, not pcb->connected (with an error code).
 1019 
 1020   2009-04-19 Simon Goldschmidt
 1021   * tcp_out.c: Fixed bug #26236: "TCP options (timestamp) don't work with
 1022     no-copy-tcpwrite": deallocate option data, only concat segments with same flags
 1023 
 1024   2009-04-19 Simon Goldschmidt
 1025   * tcp_out.c: Fixed bug #25094: "Zero-length pbuf" (options are now allocated
 1026     in the header pbuf, not the data pbuf)
 1027 
 1028   2009-04-18 Simon Goldschmidt
 1029   * api_msg.c: fixed bug #25695: Segmentation fault in do_writemore()
 1030 
 1031   2009-04-15 Simon Goldschmidt
 1032   * sockets.c: tried to fix bug #23559: lwip_recvfrom problem with tcp
 1033 
 1034   2009-04-15 Simon Goldschmidt
 1035   * dhcp.c: task #9192: mem_free of dhcp->options_in and dhcp->msg_in
 1036 
 1037   2009-04-15 Simon Goldschmidt
 1038   * ip.c, ip6.c, tcp_out.c, ip.h: patch #6808: Add a utility function
 1039     ip_hinted_output() (for smaller code mainly)
 1040 
 1041   2009-04-15 Simon Goldschmidt
 1042   * inet.c: patch #6765: Supporting new line characters in inet_aton()
 1043 
 1044   2009-04-15 Simon Goldschmidt
 1045   * dhcp.c: patch #6764: DHCP rebind and renew did not send hostnam option;
 1046     Converted constant OPTION_MAX_MSG_SIZE to netif->mtu, check if netif->mtu
 1047     is big enough in dhcp_start
 1048 
 1049   2009-04-15 Simon Goldschmidt
 1050   * netbuf.c: bug #26027: netbuf_chain resulted in pbuf memory leak
 1051 
 1052   2009-04-15 Simon Goldschmidt
 1053   * sockets.c, ppp.c: bug #25763: corrected 4 occurrences of SMEMCPY to MEMCPY
 1054 
 1055   2009-04-15 Simon Goldschmidt
 1056   * sockets.c: bug #26121: set_errno can be overridden
 1057 
 1058   2009-04-09 Kieran Mansley (patch from Luca Ceresoli <lucaceresoli>)
 1059   * init.c, opt.h: Patch#6774 TCP_QUEUE_OOSEQ breaks compilation when
 1060     LWIP_TCP==0
 1061 
 1062   2009-04-09 Kieran Mansley (patch from Roy Lee <roylee17>)
 1063   * tcp.h: Patch#6802 Add do-while-clauses to those function like
 1064     macros in tcp.h
 1065 
 1066   2009-03-31 Kieran Mansley
 1067   * tcp.c, tcp_in.c, tcp_out.c, tcp.h, opt.h: Rework the way window
 1068     updates are calculated and sent (BUG20515)
 1069 
 1070   * tcp_in.c: cope with SYN packets received during established states,
 1071     and retransmission of initial SYN.
 1072 
 1073   * tcp_out.c: set push bit correctly when tcp segments are merged
 1074 
 1075   2009-03-27 Kieran Mansley
 1076   * tcp_out.c set window correctly on probes (correcting change made
 1077     yesterday)
 1078 
 1079   2009-03-26 Kieran Mansley
 1080   * tcp.c, tcp_in.c, tcp.h: add tcp_abandon() to cope with dropping
 1081     connections where no reset required (bug #25622)
 1082 
 1083   * tcp_out.c: set TCP_ACK flag on keepalive and zero window probes 
 1084     (bug #20779)
 1085 
 1086   2009-02-18 Simon Goldschmidt (Jonathan Larmour and Bill Auerbach)
 1087   * ip_frag.c: patch #6528: the buffer used for IP_FRAG_USES_STATIC_BUF could be
 1088     too small depending on MEM_ALIGNMENT
 1089 
 1090   2009-02-16 Simon Goldschmidt
 1091   * sockets.h/.c, api_*.h/.c: fixed arguments of socket functions to match the standard;
 1092     converted size argument of netconn_write to 'size_t'
 1093 
 1094   2009-02-16 Simon Goldschmidt
 1095   * tcp.h, tcp.c: fixed bug #24440: TCP connection close problem on 64-bit host
 1096     by moving accept callback function pointer to TCP_PCB_COMMON
 1097 
 1098   2009-02-12 Simon Goldschmidt
 1099   * dhcp.c: fixed bug #25345 (DHCPDECLINE is sent with "Maximum message size"
 1100     option)
 1101 
 1102   2009-02-11 Simon Goldschmidt
 1103   * dhcp.c: fixed bug #24480 (releasing old udp_pdb and pbuf in dhcp_start)
 1104 
 1105   2009-02-11 Simon Goldschmidt
 1106   * opt.h, api_msg.c: added configurable default valud for netconn->recv_bufsize:
 1107     RECV_BUFSIZE_DEFAULT (fixes bug #23726: pbuf pool exhaustion on slow recv())
 1108 
 1109   2009-02-10 Simon Goldschmidt
 1110   * tcp.c: fixed bug #25467: Listen backlog is not reset on timeout in SYN_RCVD:
 1111     Accepts_pending is decrease on a corresponding listen pcb when a connection
 1112     in state SYN_RCVD is close.
 1113 
 1114   2009-01-28 Jonathan Larmour
 1115   * pbuf.c: reclaim pbufs from TCP out-of-sequence segments if we run
 1116     out of pool pbufs.
 1117 
 1118   2008-12-19 Simon Goldschmidt
 1119   * many files: patch #6699: fixed some warnings on platform where sizeof(int) == 2 
 1120 
 1121   2008-12-10 Tamas Somogyi, Frédéric Bernon
 1122   * sockets.c: fixed bug #25051: lwip_recvfrom problem with udp: fromaddr and
 1123     port uses deleted netbuf.
 1124 
 1125   2008-10-18 Simon Goldschmidt
 1126   * tcp_in.c: fixed bug ##24596: Vulnerability on faulty TCP options length
 1127     in tcp_parseopt
 1128 
 1129   2008-10-15 Simon Goldschmidt
 1130   * ip_frag.c: fixed bug #24517: IP reassembly crashes on unaligned IP headers
 1131     by packing the struct ip_reass_helper.
 1132 
 1133   2008-10-03 David Woodhouse, Jonathan Larmour
 1134   * etharp.c (etharp_arp_input): Fix type aliasing problem copying ip address.
 1135 
 1136   2008-10-02 Jonathan Larmour
 1137   * dns.c: Hard-code structure sizes, to avoid issues on some compilers where
 1138     padding is included.
 1139 
 1140   2008-09-30 Jonathan Larmour
 1141   * sockets.c (lwip_accept): check addr isn't NULL. If it's valid, do an
 1142     assertion check that addrlen isn't NULL.
 1143 
 1144   2008-09-30 Jonathan Larmour
 1145   * tcp.c: Fix bug #24227, wrong error message in tcp_bind.
 1146 
 1147   2008-08-26 Simon Goldschmidt
 1148   * inet.h, ip_addr.h: fixed bug #24132: Cross-dependency between ip_addr.h and
 1149     inet.h -> moved declaration of struct in_addr from ip_addr.h to inet.h
 1150 
 1151   2008-08-14 Simon Goldschmidt
 1152   * api_msg.c: fixed bug #23847: do_close_internal references freed memory (when
 1153     tcp_close returns != ERR_OK)
 1154 
 1155   2008-07-08 Frédéric Bernon
 1156   * stats.h: Fix some build bugs introduced with patch #6483 (missing some parameters
 1157     in macros, mainly if MEM_STATS=0 and MEMP_STATS=0).
 1158 
 1159   2008-06-24 Jonathan Larmour
 1160   * tcp_in.c: Fix for bug #23693 as suggested by Art R. Ensure cseg is unused
 1161     if tcp_seg_copy fails.
 1162 
 1163   2008-06-17 Simon Goldschmidt
 1164   * inet_chksum.c: Checked in some ideas of patch #6460 (loop optimizations)
 1165     and created defines for swapping bytes and folding u32 to u16.
 1166 
 1167   2008-05-30 Kieran Mansley
 1168   * tcp_in.c Remove redundant "if" statement, and use real rcv_wnd
 1169     rather than rcv_ann_wnd when deciding if packets are in-window.
 1170     Contributed by <arasmussen@consultant.datasys.swri.edu>
 1171 
 1172   2008-05-30 Kieran Mansley
 1173   * mem.h: Fix BUG#23254.  Change macro definition of mem_* to allow
 1174     passing as function pointers when MEM_LIBC_MALLOC is defined.
 1175 
 1176   2008-05-09 Jonathan Larmour
 1177   * err.h, err.c, sockets.c: Fix bug #23119: Reorder timeout error code to
 1178     stop it being treated as a fatal error.
 1179 
 1180   2008-04-15 Simon Goldschmidt
 1181   * dhcp.c: fixed bug #22804: dhcp_stop doesn't clear NETIF_FLAG_DHCP
 1182     (flag now cleared)
 1183 
 1184   2008-03-27 Simon Goldschmidt
 1185   * mem.c, tcpip.c, tcpip.h, opt.h: fixed bug #21433 (Calling mem_free/pbuf_free
 1186     from interrupt context isn't safe): set LWIP_USE_HEAP_FROM_INTERRUPT to 1
 1187     in lwipopts.h or use pbuf_free_callback(p)/mem_free_callback(m) to free pbufs
 1188     or heap memory from interrupt context
 1189 
 1190   2008-03-26 Simon Goldschmidt
 1191   * tcp_in.c, tcp.c: fixed bug #22249: division by zero could occur if a remote
 1192     host sent a zero mss as TCP option.
 1193 
 1194 
 1195 (STABLE-1.3.0)
 1196 
 1197   ++ New features:
 1198 
 1199   2008-03-10 Jonathan Larmour
 1200   * inet_chksum.c: Allow choice of one of the sample algorithms to be
 1201     made from lwipopts.h. Fix comment on how to override LWIP_CHKSUM.
 1202 
 1203   2008-01-22 Frédéric Bernon
 1204   * tcp.c, tcp_in.c, tcp.h, opt.h: Rename LWIP_CALCULATE_EFF_SEND_MSS in 
 1205     TCP_CALCULATE_EFF_SEND_MSS to have coherent TCP options names.
 1206 
 1207   2008-01-14 Frédéric Bernon
 1208   * rawapi.txt, api_msg.c, tcp.c, tcp_in.c, tcp.h: changes for task #7675 "Enable
 1209     to refuse data on a TCP_EVENT_RECV call". Important, behavior changes for the
 1210     tcp_recv callback (see rawapi.txt).
 1211 
 1212   2008-01-14 Frédéric Bernon, Marc Chaland
 1213   * ip.c: Integrate patch #6369" ip_input : checking before realloc".
 1214   
 1215   2008-01-12 Frédéric Bernon
 1216   * tcpip.h, tcpip.c, api.h, api_lib.c, api_msg.c, sockets.c: replace the field
 1217     netconn::sem per netconn::op_completed like suggested for the task #7490
 1218     "Add return value to sys_mbox_post".
 1219 
 1220   2008-01-12 Frédéric Bernon
 1221   * api_msg.c, opt.h: replace DEFAULT_RECVMBOX_SIZE per DEFAULT_TCP_RECVMBOX_SIZE,
 1222     DEFAULT_UDP_RECVMBOX_SIZE and DEFAULT_RAW_RECVMBOX_SIZE (to optimize queues
 1223     sizes), like suggested for the task #7490 "Add return value to sys_mbox_post".
 1224 
 1225   2008-01-10 Frédéric Bernon
 1226   * tcpip.h, tcpip.c: add tcpip_callback_with_block function for the task #7490
 1227     "Add return value to sys_mbox_post". tcpip_callback is always defined as
 1228     "blocking" ("block" parameter = 1).
 1229 
 1230   2008-01-10 Frédéric Bernon
 1231   * tcpip.h, tcpip.c, api.h, api_lib.c, api_msg.c, sockets.c: replace the field
 1232     netconn::mbox (sys_mbox_t) per netconn::sem (sys_sem_t) for the task #7490
 1233     "Add return value to sys_mbox_post".
 1234 
 1235   2008-01-05 Frédéric Bernon
 1236   * sys_arch.txt, api.h, api_lib.c, api_msg.h, api_msg.c, tcpip.c, sys.h, opt.h:
 1237     Introduce changes for task #7490 "Add return value to sys_mbox_post" with some
 1238     modifications in the sys_mbox api: sys_mbox_new take a "size" parameters which
 1239     indicate the number of pointers query by the mailbox. There is three defines
 1240     in opt.h to indicate sizes for tcpip::mbox, netconn::recvmbox, and for the 
 1241     netconn::acceptmbox. Port maintainers, you can decide to just add this new 
 1242     parameter in your implementation, but to ignore it to keep the previous behavior.
 1243     The new sys_mbox_trypost function return a value to know if the mailbox is
 1244     full or if the message is posted. Take a look to sys_arch.txt for more details.
 1245     This new function is used in tcpip_input (so, can be called in an interrupt
 1246     context since the function is not blocking), and in recv_udp and recv_raw.
 1247 
 1248   2008-01-04 Frédéric Bernon, Simon Goldschmidt, Jonathan Larmour
 1249   * rawapi.txt, api.h, api_lib.c, api_msg.h, api_msg.c, sockets.c, tcp.h, tcp.c,
 1250     tcp_in.c, init.c, opt.h: rename backlog options with TCP_ prefix, limit the
 1251     "backlog" parameter in an u8_t, 0 is interpreted as "smallest queue", add
 1252     documentation in the rawapi.txt file.
 1253 
 1254   2007-12-31 Kieran Mansley (based on patch from Per-Henrik Lundbolm)
 1255   * tcp.c, tcp_in.c, tcp_out.c, tcp.h: Add TCP persist timer
 1256 
 1257   2007-12-31 Frédéric Bernon, Luca Ceresoli
 1258   * autoip.c, etharp.c: ip_addr.h: Integrate patch #6348: "Broadcast ARP packets
 1259     in autoip". The change in etharp_raw could be removed, since all calls to
 1260     etharp_raw use ethbroadcast for the "ethdst_addr" parameter. But it could be
 1261     wrong in the future.
 1262 
 1263   2007-12-30 Frédéric Bernon, Tom Evans
 1264   * ip.c: Fix bug #21846 "LwIP doesn't appear to perform any IP Source Address
 1265     Filtering" reported by Tom Evans.
 1266 
 1267   2007-12-21 Frédéric Bernon, Simon Goldschmidt, Jonathan Larmour
 1268   * tcp.h, opt.h, api.h, api_msg.h, tcp.c, tcp_in.c, api_lib.c, api_msg.c,
 1269     sockets.c, init.c: task #7252: Implement TCP listen backlog: Warning: raw API
 1270     applications have to call 'tcp_accepted(pcb)' in their accept callback to
 1271     keep accepting new connections.
 1272 
 1273   2007-12-13 Frédéric Bernon
 1274   * api_msg.c, err.h, err.c, sockets.c, dns.c, dns.h: replace "enum dns_result"
 1275     by err_t type. Add a new err_t code "ERR_INPROGRESS".
 1276 
 1277   2007-12-12 Frédéric Bernon
 1278   * dns.h, dns.c, opt.h: move DNS options to the "right" place. Most visibles
 1279     are the one which have ram usage.
 1280 
 1281   2007-12-05 Frédéric Bernon
 1282   * netdb.c: add a LWIP_DNS_API_HOSTENT_STORAGE option to decide to use a static
 1283     set of variables (=0) or a local one (=1). In this last case, your port should
 1284     provide a function "struct hostent* sys_thread_hostent( struct hostent* h)"
 1285     which have to do a copy of "h" and return a pointer ont the "per-thread" copy.
 1286 
 1287   2007-12-03 Simon Goldschmidt
 1288   * ip.c: ip_input: check if a packet is for inp first before checking all other
 1289     netifs on netif_list (speeds up packet receiving in most cases)
 1290 
 1291   2007-11-30 Simon Goldschmidt
 1292   * udp.c, raw.c: task #7497: Sort lists (pcb, netif, ...) for faster access
 1293     UDP: move a (connected) pcb selected for input to the front of the list of
 1294     pcbs so that it is found faster next time. Same for RAW pcbs that have eaten
 1295     a packet.
 1296 
 1297   2007-11-28 Simon Goldschmidt
 1298   * etharp.c, stats.c, stats.h, opt.h: Introduced ETHARP_STATS
 1299 
 1300   2007-11-25 Simon Goldschmidt
 1301   * dhcp.c: dhcp_unfold_reply() uses pbuf_copy_partial instead of its own copy
 1302     algorithm.
 1303 
 1304   2007-11-24 Simon Goldschmidt
 1305   * netdb.h, netdb.c, sockets.h/.c: Moved lwip_gethostbyname from sockets.c
 1306     to the new file netdb.c; included lwip_getaddrinfo.
 1307 
 1308   2007-11-21 Simon Goldschmidt
 1309   * tcp.h, opt.h, tcp.c, tcp_in.c: implemented calculating the effective send-mss
 1310     based on the MTU of the netif used to send. Enabled by default. Disable by
 1311     setting LWIP_CALCULATE_EFF_SEND_MSS to 0. This fixes bug #21492.
 1312 
 1313   2007-11-19 Frédéric Bernon
 1314   * api_msg.c, dns.h, dns.c: Implement DNS_DOES_NAME_CHECK option (check if name
 1315     received match the name query), implement DNS_USES_STATIC_BUF (the place where
 1316     copy dns payload to parse the response), return an error if there is no place
 1317     for a new query, and fix some minor problems.
 1318 
 1319   2007-11-16 Simon Goldschmidt
 1320   * new files: ipv4/inet.c, ipv4/inet_chksum.c, ipv6/inet6.c
 1321     removed files: core/inet.c, core/inet6.c
 1322     Moved inet files into ipv4/ipv6 directory; splitted inet.c/inet.h into
 1323     inet and chksum part; changed includes in all lwIP files as appropriate
 1324 
 1325   2007-11-16 Simon Goldschmidt
 1326   * api.h, api_msg.h, api_lib.c, api_msg.c, socket.h, socket.c: Added sequential
 1327     dns resolver function for netconn api (netconn_gethostbyname) and socket api
 1328     (gethostbyname/gethostbyname_r).
 1329 
 1330   2007-11-15 Jim Pettinato, Frédéric Bernon
 1331   * opt.h, init.c, tcpip.c, dhcp.c, dns.h, dns.c: add DNS client for simple name
 1332     requests with RAW api interface. Initialization is done in lwip_init() with
 1333     build time options. DNS timer is added in tcpip_thread context. DHCP can set
 1334     DNS server ip addresses when options are received. You need to set LWIP_DNS=1
 1335     in your lwipopts.h file (LWIP_DNS=0 in opt.h). DNS_DEBUG can be set to get
 1336     some traces with LWIP_DEBUGF. Sanity check have been added. There is a "todo"
 1337     list with points to improve.
 1338 
 1339   2007-11-06 Simon Goldschmidt
 1340   * opt.h, mib2.c: Patch #6215: added ifAdminStatus write support (if explicitly
 1341     enabled by defining SNMP_SAFE_REQUESTS to 0); added code to check link status
 1342     for ifOperStatus if LWIP_NETIF_LINK_CALLBACK is defined.
 1343 
 1344   2007-11-06 Simon Goldschmidt
 1345   * api.h, api_msg.h and dependent files: Task #7410: Removed the need to include
 1346     core header files in api.h (ip/tcp/udp/raw.h) to hide the internal
 1347     implementation from netconn api applications.
 1348 
 1349   2007-11-03 Frédéric Bernon
 1350   * api.h, api_lib.c, api_msg.c, sockets.c, opt.h: add SO_RCVBUF option for UDP &
 1351     RAW netconn. You need to set LWIP_SO_RCVBUF=1 in your lwipopts.h (it's disabled
 1352     by default). Netconn API users can use the netconn_recv_bufsize macro to access
 1353     it. This is a first release which have to be improve for TCP. Note it used the
 1354     netconn::recv_avail which need to be more "thread-safe" (note there is already
 1355     the problem for FIONREAD with lwip_ioctl/ioctlsocket).
 1356 
 1357   2007-11-01 Frédéric Bernon, Marc Chaland
 1358   * sockets.h, sockets.c, api.h, api_lib.c, api_msg.h, api_msg.c, tcp.h, tcp_out.c:
 1359     Integrate "patch #6250 : MSG_MORE flag for send". MSG_MORE is used at socket api
 1360     layer, NETCONN_MORE at netconn api layer, and TCP_WRITE_FLAG_MORE at raw api
 1361     layer. This option enable to delayed TCP PUSH flag on multiple "write" calls.
 1362     Note that previous "copy" parameter for "write" APIs is now called "apiflags".
 1363 
 1364   2007-10-24 Frédéric Bernon
 1365   * api.h, api_lib.c, api_msg.c: Add macro API_EVENT in the same spirit than 
 1366     TCP_EVENT_xxx macros to get a code more readable. It could also help to remove
 1367     some code (like we have talk in "patch #5919 : Create compile switch to remove
 1368     select code"), but it could be done later.
 1369 
 1370   2007-10-08 Simon Goldschmidt
 1371   * many files: Changed initialization: many init functions are not needed any
 1372     more since we now rely on the compiler initializing global and static
 1373     variables to zero!
 1374 
 1375   2007-10-06 Simon Goldschmidt
 1376   * ip_frag.c, memp.c, mib2.c, ip_frag.h, memp_std.h, opt.h: Changed IP_REASSEMBLY
 1377     to enqueue the received pbufs so that multiple packets can be reassembled
 1378     simultaneously and no static reassembly buffer is needed.
 1379 
 1380   2007-10-05 Simon Goldschmidt
 1381   * tcpip.c, etharp.h, etharp.c: moved ethernet_input from tcpip.c to etharp.c so
 1382     all netifs (or ports) can use it.
 1383 
 1384   2007-10-05 Frédéric Bernon
 1385   * netifapi.h, netifapi.c: add function netifapi_netif_set_default. Change the 
 1386     common function to reduce a little bit the footprint (for all functions using
 1387     only the "netif" parameter).
 1388 
 1389   2007-10-03 Frédéric Bernon
 1390   * netifapi.h, netifapi.c: add functions netifapi_netif_set_up, netifapi_netif_set_down,
 1391     netifapi_autoip_start and netifapi_autoip_stop. Use a common function to reduce
 1392     a little bit the footprint (for all functions using only the "netif" parameter).
 1393 
 1394   2007-09-15 Frédéric Bernon
 1395   * udp.h, udp.c, sockets.c: Changes for "#20503 IGMP Improvement". Add IP_MULTICAST_IF
 1396     option in socket API, and a new field "multicast_ip" in "struct udp_pcb" (for
 1397     netconn and raw API users), only if LWIP_IGMP=1. Add getsockopt processing for
 1398     IP_MULTICAST_TTL and IP_MULTICAST_IF.
 1399 
 1400   2007-09-10 Frédéric Bernon
 1401   * snmp.h, mib2.c: enable to remove SNMP timer (which consumne several cycles
 1402     even when it's not necessary). snmp_agent.txt tell to call snmp_inc_sysuptime()
 1403     each 10ms (but, it's intrusive if you use sys_timeout feature). Now, you can
 1404     decide to call snmp_add_sysuptime(100) each 1000ms (which is bigger "step", but
 1405     call to a lower frequency). Or, you can decide to not call snmp_inc_sysuptime()
 1406     or snmp_add_sysuptime(), and to define the SNMP_GET_SYSUPTIME(sysuptime) macro.
 1407     This one is undefined by default in mib2.c. SNMP_GET_SYSUPTIME is called inside
 1408     snmp_get_sysuptime(u32_t *value), and enable to change "sysuptime" value only
 1409     when it's queried (any direct call to "sysuptime" is changed by a call to 
 1410     snmp_get_sysuptime).
 1411 
 1412   2007-09-09 Frédéric Bernon, Bill Florac
 1413   * igmp.h, igmp.c, netif.h, netif.c, ip.c: To enable to have interfaces with IGMP,
 1414     and others without it, there is a new NETIF_FLAG_IGMP flag to set in netif->flags
 1415     if you want IGMP on an interface. igmp_stop() is now called inside netif_remove().
 1416     igmp_report_groups() is now called inside netif_set_link_up() (need to have
 1417     LWIP_NETIF_LINK_CALLBACK=1) to resend reports once the link is up (avoid to wait
 1418     the next query message to receive the matching multicast streams).
 1419 
 1420   2007-09-08 Frédéric Bernon
 1421   * sockets.c, ip.h, api.h, tcp.h: declare a "struct ip_pcb" which only contains
 1422     IP_PCB. Add in the netconn's "pcb" union a "struct ip_pcb *ip;" (no size change).
 1423     Use this new field to access to common pcb fields (ttl, tos, so_options, etc...).
 1424     Enable to access to these fields with LWIP_TCP=0.
 1425 
 1426   2007-09-05 Frédéric Bernon
 1427   * udp.c, ipv4/icmp.c, ipv4/ip.c, ipv6/icmp.c, ipv6/ip6.c, ipv4/icmp.h,
 1428     ipv6/icmp.h, opt.h: Integrate "task #7272 : LWIP_ICMP option". The new option
 1429     LWIP_ICMP enable/disable ICMP module inside the IP stack (enable per default).
 1430     Be careful, disabling ICMP make your product non-compliant to RFC1122, but
 1431     help to reduce footprint, and to reduce "visibility" on the Internet.
 1432 
 1433   2007-09-05 Frédéric Bernon, Bill Florac
 1434   * opt.h, sys.h, tcpip.c, slipif.c, ppp.c, sys_arch.txt: Change parameters list
 1435     for sys_thread_new (see "task #7252 : Create sys_thread_new_ex()"). Two new
 1436     parameters have to be provided: a task name, and a task stack size. For this
 1437     one, since it's platform dependant, you could define the best one for you in
 1438     your lwipopts.h. For port maintainers, you can just add these new parameters
 1439     in your sys_arch.c file, and but it's not mandatory, use them in your OS
 1440     specific functions.
 1441 
 1442   2007-09-05 Frédéric Bernon
 1443   * inet.c, autoip.c, msg_in.c, msg_out.c, init.c: Move some build time checkings
 1444     inside init.c for task #7142 "Sanity check user-configurable values".
 1445 
 1446   2007-09-04 Frédéric Bernon, Bill Florac
 1447   * igmp.h, igmp.c, memp_std.h, memp.c, init.c, opt.h: Replace mem_malloc call by
 1448     memp_malloc, and use a new MEMP_NUM_IGMP_GROUP option (see opt.h to define the
 1449     value). It will avoid potential fragmentation problems, use a counter to know
 1450     how many times a group is used on an netif, and free it when all applications
 1451     leave it. MEMP_NUM_IGMP_GROUP got 8 as default value (and init.c got a sanity
 1452     check if LWIP_IGMP!=0).
 1453 
 1454   2007-09-03 Frédéric Bernon
 1455   * igmp.h, igmp.c, sockets.c, api_msg.c: Changes for "#20503 IGMP Improvement".
 1456     Initialize igmp_mac_filter to NULL in netif_add (this field should be set in
 1457     the netif's "init" function). Use the "imr_interface" field (for socket layer)
 1458     and/or the "interface" field (for netconn layer), for join/leave operations.
 1459     The igmp_join/leavegroup first parameter change from a netif to an ipaddr.
 1460     This field could be a netif's ipaddr, or "any" (same meaning than ip_addr_isany).
 1461 
 1462   2007-08-30 Frédéric Bernon
 1463   * Add netbuf.h, netbuf.c, Change api.h, api_lib.c: #7249 "Split netbuf functions
 1464     from api/api_lib". Now netbuf API is independant of netconn, and can be used
 1465     with other API (application based on raw API, or future "socket2" API). Ports
 1466     maintainers just have to add src/api/netbuf.c in their makefile/projects.
 1467 
 1468   2007-08-30 Frédéric Bernon, Jonathan Larmour
 1469   * init.c: Add first version of lwip_sanity_check for task #7142 "Sanity check
 1470     user-configurable values".
 1471 
 1472   2007-08-29 Frédéric Bernon
 1473   * igmp.h, igmp.c, tcpip.c, init.c, netif.c: change igmp_init and add igmp_start.
 1474     igmp_start is call inside netif_add. Now, igmp initialization is in the same
 1475     spirit than the others modules. Modify some IGMP debug traces.
 1476 
 1477   2007-08-29 Frédéric Bernon
 1478   * Add init.h, init.c, Change opt.h, tcpip.c: Task  #7213 "Add a lwip_init function"
 1479     Add lwip_init function to regroup all modules initializations, and to provide
 1480     a place to add code for task #7142 "Sanity check user-configurable values".
 1481     Ports maintainers should remove direct initializations calls from their code,
 1482     and add init.c in their makefiles. Note that lwip_init() function is called
 1483     inside tcpip_init, but can also be used by raw api users since all calls are
 1484     disabled when matching options are disabled. Also note that their is new options
 1485     in opt.h, you should configure in your lwipopts.h (they are enabled per default).
 1486 
 1487   2007-08-26 Marc Boucher
 1488   * api_msg.c: do_close_internal(): Reset the callbacks and arg (conn) to NULL
 1489     since they can under certain circumstances be called with an invalid conn
 1490     pointer after the connection has been closed (and conn has been freed). 
 1491 
 1492   2007-08-25 Frédéric Bernon (Artem Migaev's Patch)
 1493   * netif.h, netif.c: Integrate "patch #6163 : Function to check if link layer is up".
 1494     Add a netif_is_link_up() function if LWIP_NETIF_LINK_CALLBACK option is set.
 1495 
 1496   2007-08-22 Frédéric Bernon
 1497   * netif.h, netif.c, opt.h: Rename LWIP_NETIF_CALLBACK in LWIP_NETIF_STATUS_CALLBACK
 1498     to be coherent with new LWIP_NETIF_LINK_CALLBACK option before next release.
 1499 
 1500   2007-08-22 Frédéric Bernon
 1501   * tcpip.h, tcpip.c, ethernetif.c, opt.h: remove options ETHARP_TCPIP_INPUT &
 1502     ETHARP_TCPIP_ETHINPUT, now, only "ethinput" code is supported, even if the 
 1503     name is tcpip_input (we keep the name of 1.2.0 function).
 1504 
 1505   2007-08-17 Jared Grubb
 1506   * memp_std.h, memp.h, memp.c, mem.c, stats.c: (Task #7136) Centralize mempool 
 1507     settings into new memp_std.h and optional user file lwippools.h. This adds
 1508     more dynamic mempools, and allows the user to create an arbitrary number of
 1509     mempools for mem_malloc.
 1510 
 1511   2007-08-16 Marc Boucher
 1512   * api_msg.c: Initialize newconn->state to NETCONN_NONE in accept_function;
 1513     otherwise it was left to NETCONN_CLOSE and sent_tcp() could prematurely
 1514     close the connection.
 1515 
 1516   2007-08-16 Marc Boucher
 1517   * sockets.c: lwip_accept(): check netconn_peer() error return.
 1518 
 1519   2007-08-16 Marc Boucher
 1520   * mem.c, mem.h: Added mem_calloc().
 1521 
 1522   2007-08-16 Marc Boucher
 1523   * tcpip.c, tcpip.h memp.c, memp.h: Added distinct memp (MEMP_TCPIP_MSG_INPKT)
 1524     for input packets to prevent floods from consuming all of MEMP_TCPIP_MSG
 1525     and starving other message types.
 1526     Renamed MEMP_TCPIP_MSG to MEMP_TCPIP_MSG_API
 1527 
 1528   2007-08-16 Marc Boucher
 1529   * pbuf.c, pbuf.h, etharp.c, tcp_in.c, sockets.c: Split pbuf flags in pbuf
 1530     type and flgs (later renamed to flags).
 1531     Use enum pbuf_flag as pbuf_type.  Renumber PBUF_FLAG_*.
 1532     Improved lwip_recvfrom().  TCP push now propagated.
 1533 
 1534   2007-08-16 Marc Boucher
 1535   * ethernetif.c, contrib/ports/various: ethbroadcast now a shared global
 1536     provided by etharp.
 1537 
 1538   2007-08-16 Marc Boucher
 1539   * ppp_oe.c ppp_oe.h, auth.c chap.c fsm.c lcp.c ppp.c ppp.h,
 1540     etharp.c ethernetif.c, etharp.h, opt.h tcpip.h, tcpip.c:
 1541     Added PPPoE support and various PPP improvements.
 1542 
 1543   2007-07-25 Simon Goldschmidt
 1544   * api_lib.c, ip_frag.c, pbuf.c, api.h, pbuf.h: Introduced pbuf_copy_partial,
 1545     making netbuf_copy_partial use this function.
 1546 
 1547   2007-07-25 Simon Goldschmidt
 1548   * tcp_in.c: Fix bug #20506: Slow start / initial congestion window starts with
 1549     2 * mss (instead of 1 * mss previously) to comply with some newer RFCs and
 1550     other stacks.
 1551 
 1552   2007-07-13 Jared Grubb (integrated by Frédéric Bernon)
 1553   * opt.h, netif.h, netif.c, ethernetif.c: Add new configuration option to add
 1554     a link callback in the netif struct, and functions to handle it. Be carefull
 1555     for port maintainers to add the NETIF_FLAG_LINK_UP flag (like in ethernetif.c)
 1556     if you want to be sure to be compatible with future changes...
 1557 
 1558   2007-06-30 Frédéric Bernon
 1559   * sockets.h, sockets.c: Implement MSG_PEEK flag for recv/recvfrom functions.
 1560 
 1561   2007-06-21 Simon Goldschmidt
 1562   * etharp.h, etharp.c: Combined etharp_request with etharp_raw for both
 1563     LWIP_AUTOIP =0 and =1 to remove redundant code.
 1564 
 1565   2007-06-21 Simon Goldschmidt
 1566   * mem.c, memp.c, mem.h, memp.h, opt.h: task #6863: Introduced the option
 1567     MEM_USE_POOLS to use 4 pools with different sized elements instead of a
 1568     heap. This both prevents memory fragmentation and gives a higher speed
 1569     at the cost of more memory consumption. Turned off by default.
 1570 
 1571   2007-06-21 Simon Goldschmidt
 1572   * api_lib.c, api_msg.c, api.h, api_msg.h: Converted the length argument of
 1573     netconn_write (and therefore also api_msg_msg.msg.w.len) from u16_t into
 1574     int to be able to send a bigger buffer than 64K with one time (mainly
 1575     used from lwip_send).
 1576 
 1577   2007-06-21 Simon Goldschmidt
 1578   * tcp.h, api_msg.c: Moved the nagle algorithm from netconn_write/do_write
 1579     into a define (tcp_output_nagle) in tcp.h to provide it to raw api users, too.
 1580 
 1581   2007-06-21 Simon Goldschmidt
 1582   * api.h, api_lib.c, api_msg.c: Fixed bug #20021: Moved sendbuf-processing in
 1583     netconn_write from api_lib.c to api_msg.c to also prevent multiple context-
 1584     changes on low memory or empty send-buffer.
 1585 
 1586   2007-06-18 Simon Goldschmidt
 1587   * etharp.c, etharp.h: Changed etharp to use a defined hardware address length
 1588     of 6 to avoid loading netif->hwaddr_len every time (since this file is only
 1589     used for ethernet and struct eth_addr already had a defined length of 6).
 1590 
 1591   2007-06-17 Simon Goldschmidt
 1592   * sockets.c, sockets.h: Implemented socket options SO_NO_CHECK for UDP sockets
 1593     to disable UDP checksum generation on transmit.
 1594 
 1595   2007-06-13 Frédéric Bernon, Simon Goldschmidt
 1596   * debug.h, api_msg.c: change LWIP_ERROR to use it to check errors like invalid
 1597     pointers or parameters, and let the possibility to redefined it in cc.h. Use
 1598     this macro to check "conn" parameter in api_msg.c functions.
 1599 
 1600   2007-06-11 Simon Goldschmidt
 1601   * sockets.c, sockets.h: Added UDP lite support for sockets
 1602 
 1603   2007-06-10 Simon Goldschmidt
 1604   * udp.h, opt.h, api_msg.c, ip.c, udp.c: Included switch LWIP_UDPLITE (enabled
 1605     by default) to switch off UDP-Lite support if not needed (reduces udp.c code
 1606     size)
 1607 
 1608   2007-06-09 Dominik Spies (integrated by Frédéric Bernon)
 1609   * autoip.h, autoip.c, dhcp.h, dhcp.c, netif.h, netif.c, etharp.h, etharp.c, opt.h:
 1610     AutoIP implementation available for IPv4, with new options LWIP_AUTOIP and
 1611     LWIP_DHCP_AUTOIP_COOP if you want to cooperate with DHCP. Some tips to adapt
 1612     (see TODO mark in the source code).
 1613 
 1614   2007-06-09 Simon Goldschmidt
 1615   * etharp.h, etharp.c, ethernetif.c: Modified order of parameters for
 1616     etharp_output() to match netif->output so etharp_output() can be used
 1617     directly as netif->output to save one function call.
 1618 
 1619   2007-06-08 Simon Goldschmidt
 1620   * netif.h, ethernetif.c, slipif.c, loopif.c: Added define
 1621     NETIF_INIT_SNMP(netif, type, speed) to initialize per-netif snmp variables,
 1622     added initialization of those to ethernetif, slipif and loopif.
 1623 
 1624   2007-05-18 Simon Goldschmidt
 1625   * opt.h, ip_frag.c, ip_frag.h, ip.c: Added option IP_FRAG_USES_STATIC_BUF
 1626     (defaulting to off for now) that can be set to 0 to send fragmented
 1627     packets by passing PBUF_REFs down the stack.
 1628 
 1629   2007-05-23 Frédéric Bernon
 1630   * api_lib.c: Implement SO_RCVTIMEO for accept and recv on TCP
 1631     connections, such present in patch #5959.
 1632 
 1633   2007-05-23 Frédéric Bernon
 1634   * api.h, api_lib.c, api_msg.c, sockets.c: group the different NETCONN_UDPxxx
 1635     code in only one part...
 1636 
 1637   2007-05-18 Simon Goldschmidt
 1638   * opt.h, memp.h, memp.c: Added option MEMP_OVERFLOW_CHECK to check for memp
 1639     elements to overflow. This is achieved by adding some bytes before and after
 1640     each pool element (increasing their size, of course), filling them with a
 1641     prominent value and checking them on freeing the element.
 1642     Set it to 2 to also check every element in every pool each time memp_malloc()
 1643     or memp_free() is called (slower but more helpful).
 1644 
 1645   2007-05-10 Simon Goldschmidt
 1646   * opt.h, memp.h, memp.c, pbuf.c (see task #6831): use a new memp pool for
 1647     PBUF_POOL pbufs instead of the old pool implementation in pbuf.c to reduce
 1648     code size.
 1649 
 1650   2007-05-11 Frédéric Bernon
 1651   * sockets.c, api_lib.c, api_msg.h, api_msg.c, netifapi.h, netifapi.c, tcpip.c:
 1652     Include a function pointer instead of a table index in the message to reduce
 1653     footprint. Disable some part of lwip_send and lwip_sendto if some options are
 1654     not set (LWIP_TCP, LWIP_UDP, LWIP_RAW).
 1655 
 1656   2007-05-10 Simon Goldschmidt
 1657   * *.h (except netif/ppp/*.h): Included patch #5448: include '#ifdef __cplusplus
 1658     \ extern "C" {' in all header files. Now you can write your application using
 1659     the lwIP stack in C++ and simply #include the core files. Note I have left
 1660     out the netif/ppp/*h header files for now, since I don't know which files are
 1661     included by applications and which are for internal use only.
 1662 
 1663   2007-05-09 Simon Goldschmidt
 1664   * opt.h, *.c/*.h: Included patch #5920: Create define to override C-library
 1665     memcpy. 2 Defines are created: MEMCPY() for normal memcpy, SMEMCPY() for
 1666     situations where some compilers might inline the copy and save a function
 1667     call. Also replaced all calls to memcpy() with calls to (S)MEMCPY().
 1668 
 1669   2007-05-08 Simon Goldschmidt
 1670   * mem.h: If MEM_LIBC_MALLOC==1, allow the defines (e.g. mem_malloc() -> malloc())
 1671     to be overriden in case the C-library malloc implementation is not protected
 1672     against concurrent access.
 1673 
 1674   2007-05-04 Simon Goldschmidt (Atte Kojo)
 1675   * etharp.c: Introduced fast one-entry-cache to speed up ARP lookup when sending
 1676     multiple packets to the same host.
 1677 
 1678   2007-05-04 Frédéric Bernon, Jonathan Larmour
 1679   * sockets.c, api.h, api_lib.c, api_msg.h, api_msg.c: Fix bug #19162 "lwip_sento: a possible
 1680     to corrupt remote addr/port connection state". Reduce problems "not enought memory" with
 1681     netbuf (if we receive lot of datagrams). Improve lwip_sendto (only one exchange between
 1682     sockets api and api_msg which run in tcpip_thread context). Add netconn_sento function.
 1683     Warning, if you directly access to "fromaddr" & "fromport" field from netbuf struct,
 1684     these fields are now renamed "addr" & "port".
 1685 
 1686   2007-04-11 Jonathan Larmour
 1687   * sys.h, api_lib.c: Provide new sys_mbox_tryfetch function. Require ports to provide new
 1688     sys_arch_mbox_tryfetch function to get a message if one is there, otherwise return
 1689     with SYS_MBOX_EMPTY. sys_arch_mbox_tryfetch can be implemented as a function-like macro
 1690     by the port in sys_arch.h if desired.
 1691 
 1692   2007-04-06 Frédéric Bernon, Simon Goldschmidt
 1693   * opt.h, tcpip.h, tcpip.c, netifapi.h, netifapi.c: New configuration option LWIP_NETIF_API
 1694     allow to use thread-safe functions to add/remove netif in list, and to start/stop dhcp
 1695     clients, using new functions from netifapi.h. Disable as default (no port change to do).
 1696 
 1697   2007-04-05 Frédéric Bernon
 1698   * sockets.c: remplace ENOBUFS errors on alloc_socket by ENFILE to be more BSD compliant.
 1699 
 1700   2007-04-04 Simon Goldschmidt
 1701   * arch.h, api_msg.c, dhcp.c, msg_in.c, sockets.c: Introduced #define LWIP_UNUSED_ARG(x)
 1702     use this for and architecture-independent form to tell the compiler you intentionally
 1703     are not using this variable. Can be overriden in cc.h.
 1704 
 1705   2007-03-28 Frédéric Bernon
 1706   * opt.h, netif.h, dhcp.h, dhcp.c: New configuration option LWIP_NETIF_HOSTNAME allow to
 1707     define a hostname in netif struct (this is just a pointer, so, you can use a hardcoded
 1708     string, point on one of your's ethernetif field, or alloc a string you will free yourself).
 1709     It will be used by DHCP to register a client hostname, but can also be use when you call
 1710     snmp_set_sysname.
 1711 
 1712   2007-03-28 Frédéric Bernon
 1713   * netif.h, netif.c: A new NETIF_FLAG_ETHARP flag is defined in netif.h, to allow to 
 1714     initialize a network interface's flag with. It tell this interface is an ethernet
 1715     device, and we can use ARP with it to do a "gratuitous ARP" (RFC 3220 "IP Mobility
 1716     Support for IPv4" section 4.6) when interface is "up" with netif_set_up().
 1717 
 1718   2007-03-26 Frédéric Bernon, Jonathan Larmour
 1719   * opt.h, tcpip.c: New configuration option LWIP_ARP allow to disable ARP init at build
 1720     time if you only use PPP or SLIP. The default is enable. Note we don't have to call 
 1721     etharp_init in your port's initilization sequence if you use tcpip.c, because this call
 1722     is done in tcpip_init function.
 1723 
 1724   2007-03-22 Frédéric Bernon
 1725   * stats.h, stats.c, msg_in.c: Stats counters can be change to u32_t if necessary with the
 1726     new option LWIP_STATS_LARGE. If you need this option, define LWIP_STATS_LARGE to 1 in
 1727     your lwipopts.h. More, unused counters are not defined in the stats structs, and not 
 1728     display by stats_display(). Note that some options (SYS_STATS and RAW_STATS) are defined
 1729     but never used. Fix msg_in.c with the correct #if test for a stat display.
 1730 
 1731   2007-03-21 Kieran Mansley
 1732   * netif.c, netif.h: Apply patch#4197 with some changes (originator: rireland@hmgsl.com). 
 1733     Provides callback on netif up/down state change.
 1734 
 1735   2007-03-11 Frédéric Bernon, Mace Gael, Steve Reynolds
 1736   * sockets.h, sockets.c, api.h, api_lib.c, api_msg.h, api_msg.c, igmp.h, igmp.c,
 1737     ip.c, netif.h, tcpip.c, opt.h:
 1738     New configuration option LWIP_IGMP to enable IGMP processing. Based on only one 
 1739     filter per all network interfaces. Declare a new function in netif to enable to
 1740     control the MAC filter (to reduce lwIP traffic processing).
 1741 
 1742   2007-03-11 Frédéric Bernon
 1743   * tcp.h, tcp.c, sockets.c, tcp_out.c, tcp_in.c, opt.h: Keepalive values can
 1744     be configured at run time with LWIP_TCP_KEEPALIVE, but don't change this
 1745     unless you know what you're doing (default are RFC1122 compliant). Note
 1746     that TCP_KEEPIDLE and TCP_KEEPINTVL have to be set in seconds.
 1747 
 1748   2007-03-08 Frédéric Bernon
 1749   * tcp.h: Keepalive values can be configured at compile time, but don't change
 1750     this unless you know what you're doing (default are RFC1122 compliant).
 1751 
 1752   2007-03-08 Frédéric Bernon
 1753   * sockets.c, api.h, api_lib.c, tcpip.c, sys.h, sys.c, err.c, opt.h:
 1754     Implement LWIP_SO_RCVTIMEO configuration option to enable/disable SO_RCVTIMEO
 1755     on UDP sockets/netconn.
 1756 
 1757   2007-03-08 Simon Goldschmidt
 1758   * snmp_msg.h, msg_in.c: SNMP UDP ports can be configured at compile time.
 1759 
 1760   2007-03-06 Frédéric Bernon
 1761   * api.h, api_lib.c, sockets.h, sockets.c, tcpip.c, sys.h, sys.c, err.h: 
 1762     Implement SO_RCVTIMEO on UDP sockets/netconn.
 1763 
 1764   2007-02-28 Kieran Mansley (based on patch from Simon Goldschmidt)
 1765   * api_lib.c, tcpip.c, memp.c, memp.h: make API msg structs allocated
 1766     on the stack and remove the API msg type from memp
 1767 
 1768   2007-02-26 Jonathan Larmour (based on patch from Simon Goldschmidt)
 1769   * sockets.h, sockets.c: Move socket initialization to new
 1770     lwip_socket_init() function.
 1771     NOTE: this changes the API with ports. Ports will have to be
 1772     updated to call lwip_socket_init() now.
 1773 
 1774   2007-02-26 Jonathan Larmour (based on patch from Simon Goldschmidt)
 1775   * api_lib.c: Use memcpy in netbuf_copy_partial.
 1776 
 1777 
 1778   ++ Bug fixes:
 1779 
 1780   2008-03-17 Frédéric Bernon, Ed Kerekes
 1781   * igmp.h, igmp.c: Fix bug #22613 "IGMP iphdr problem" (could have
 1782     some problems to fill the IP header on some targets, use now the
 1783     ip.h macros to do it).
 1784 
 1785   2008-03-13 Frédéric Bernon
 1786   * sockets.c: Fix bug #22435 "lwip_recvfrom with TCP break;". Using
 1787     (lwip_)recvfrom with valid "from" and "fromlen" parameters, on a
 1788     TCP connection caused a crash. Note that using (lwip_)recvfrom
 1789     like this is a bit slow and that using (lwip)getpeername is the
 1790     good lwip way to do it (so, using recv is faster on tcp sockets).
 1791 
 1792   2008-03-12 Frédéric Bernon, Jonathan Larmour
 1793   * api_msg.c, contrib/apps/ping.c: Fix bug #22530 "api_msg.c's
 1794     recv_raw() does not consume data", and the ping sample (with
 1795     LWIP_SOCKET=1, the code did the wrong supposition that lwip_recvfrom
 1796     returned the IP payload, without the IP header).
 1797 
 1798   2008-03-04 Jonathan Larmour
 1799   * mem.c, stats.c, mem.h: apply patch #6414 to avoid compiler errors
 1800   and/or warnings on some systems where mem_size_t and size_t differ.
 1801   * pbuf.c, ppp.c: Fix warnings on some systems with mem_malloc.
 1802 
 1803   2008-03-04 Kieran Mansley (contributions by others) 
 1804   * Numerous small compiler error/warning fixes from contributions to
 1805     mailing list after 1.3.0 release candidate made.
 1806 
 1807   2008-01-25 Cui hengbin (integrated by Frédéric Bernon)
 1808   * dns.c: Fix bug #22108 "DNS problem" caused by unaligned structures.
 1809 
 1810   2008-01-15 Kieran Mansley
 1811   * tcp_out.c: BUG20511.  Modify persist timer to start when we are
 1812     prevented from sending by a small send window, not just a zero
 1813     send window.
 1814 
 1815   2008-01-09 Jonathan Larmour
 1816   * opt.h, ip.c: Rename IP_OPTIONS define to IP_OPTIONS_ALLOWED to avoid
 1817     conflict with Linux system headers.
 1818 
 1819   2008-01-06 Jonathan Larmour
 1820   * dhcp.c: fix bug #19927: "DHCP NACK problem" by clearing any existing set IP
 1821     address entirely on receiving a DHCPNAK, and restarting discovery.
 1822 
 1823   2007-12-21 Simon Goldschmidt
 1824   * sys.h, api_lib.c, api_msg.c, sockets.c: fix bug #21698: "netconn->recv_avail
 1825     is not protected" by using new macros for interlocked access to modify/test
 1826     netconn->recv_avail.
 1827 
 1828   2007-12-20 Kieran Mansley (based on patch from Oleg Tyshev)
 1829   * tcp_in.c: fix bug# 21535 (nrtx not reset correctly in SYN_SENT state)
 1830 
 1831   2007-12-20 Kieran Mansley (based on patch from Per-Henrik Lundbolm)
 1832   * tcp.c, tcp_in.c, tcp_out.c, tcp.h: fix bug #20199 (better handling
 1833     of silly window avoidance and prevent lwIP from shrinking the window)
 1834 
 1835   2007-12-04 Simon Goldschmidt
 1836   * tcp.c, tcp_in.c: fix bug #21699 (segment leak in ooseq processing when last
 1837     data packet was lost): add assert that all segment lists are empty in
 1838     tcp_pcb_remove before setting pcb to CLOSED state; don't directly set CLOSED
 1839     state from LAST_ACK in tcp_process
 1840 
 1841   2007-12-02 Simon Goldschmidt
 1842   * sockets.h: fix bug #21654: exclude definition of struct timeval from #ifndef FD_SET
 1843     If including <sys/time.h> for system-struct timeval, LWIP_TIMEVAL_PRIVATE now
 1844     has to be set to 0 in lwipopts.h
 1845 
 1846   2007-12-02 Simon Goldschmidt
 1847   * api_msg.c, api_lib.c: fix bug #21656 (recvmbox problem in netconn API): always
 1848     allocate a recvmbox in netconn_new_with_proto_and_callback. For a tcp-listen
 1849     netconn, this recvmbox is later freed and a new mbox is allocated for acceptmbox.
 1850     This is a fix for thread-safety and allocates all items needed for a netconn
 1851     when the netconn is created.
 1852 
 1853   2007-11-30 Simon Goldschmidt
 1854   * udp.c: first attempt to fix bug #21655 (DHCP doesn't work reliably with multiple
 1855     netifs): if LWIP_DHCP is enabled, UDP packets to DHCP_CLIENT_PORT are passed
 1856     to netif->dhcp->pcb only (if that exists) and not to any other pcb for the same
 1857     port (only solution to let UDP pcbs 'bind' to a netif instead of an IP address)
 1858 
 1859   2007-11-27 Simon Goldschmidt
 1860   * ip.c: fixed bug #21643 (udp_send/raw_send don't fail if netif is down) by
 1861     letting ip_route only use netifs that are up.
 1862 
 1863   2007-11-27 Simon Goldschmidt
 1864   * err.h, api_lib.c, api_msg.c, sockets.c: Changed error handling: ERR_MEM, ERR_BUF
 1865     and ERR_RTE are seen as non-fatal, all other errors are fatal. netconns and
 1866     sockets block most operations once they have seen a fatal error.
 1867 
 1868   2007-11-27 Simon Goldschmidt
 1869   * udp.h, udp.c, dhcp.c: Implemented new function udp_sendto_if which takes the
 1870     netif to send as an argument (to be able to send on netifs that are down).
 1871 
 1872   2007-11-26 Simon Goldschmidt
 1873   * tcp_in.c: Fixed bug #21582: pcb->acked accounting can be wrong when ACKs
 1874     arrive out-of-order
 1875 
 1876   2007-11-21 Simon Goldschmidt
 1877   * tcp.h, tcp_out.c, api_msg.c: Fixed bug #20287: tcp_output_nagle sends too early
 1878     Fixed the nagle algorithm; nagle now also works for all raw API applications
 1879     and has to be explicitly disabled with 'tcp_pcb->flags |= TF_NODELAY'
 1880 
 1881   2007-11-12 Frédéric Bernon
 1882   * sockets.c, api.h, api_lib.c, api_msg.h, api_msg.c: Fixed bug #20900. Now, most
 1883     of the netconn_peer and netconn_addr processing is done inside tcpip_thread
 1884     context in do_getaddr.
 1885 
 1886   2007-11-10 Simon Goldschmidt
 1887   * etharp.c: Fixed bug: assert fired when MEMP_ARP_QUEUE was empty (which can
 1888     happen any time). Now the packet simply isn't enqueued when out of memory.
 1889 
 1890   2007-11-01 Simon Goldschmidt
 1891   * tcp.c, tcp_in.c: Fixed bug #21494: The send mss (pcb->mss) is set to 536 (or
 1892     TCP_MSS if that is smaller) as long as no MSS option is received from the
 1893     remote host.
 1894 
 1895   2007-11-01 Simon Goldschmidt
 1896   * tcp.h, tcp.c, tcp_in.c: Fixed bug #21491: The MSS option sent (with SYN)
 1897     is now based on TCP_MSS instead of pcb->mss (on passive open now effectively
 1898     sending our configured TCP_MSS instead of the one received).
 1899 
 1900   2007-11-01 Simon Goldschmidt
 1901   * tcp_in.c: Fixed bug #21181: On active open, the initial congestion window was
 1902     calculated based on the configured TCP_MSS, not on the MSS option received
 1903     with SYN+ACK.
 1904 
 1905   2007-10-09 Simon Goldschmidt
 1906   * udp.c, inet.c, inet.h: Fixed UDPLite: send: Checksum was always generated too
 1907     short and also was generated wrong if checksum coverage != tot_len;
 1908     receive: checksum was calculated wrong if checksum coverage != tot_len
 1909 
 1910   2007-10-08 Simon Goldschmidt
 1911   * mem.c: lfree was not updated in mem_realloc!
 1912 
 1913   2007-10-07 Frédéric Bernon
 1914   * sockets.c, api.h, api_lib.c: First step to fix "bug #20900 : Potential
 1915     crash error problem with netconn_peer & netconn_addr". VERY IMPORTANT:
 1916     this change cause an API breakage for netconn_addr, since a parameter
 1917     type change. Any compiler should cause an error without any changes in
 1918     yours netconn_peer calls (so, it can't be a "silent change"). It also
 1919     reduce a little bit the footprint for socket layer (lwip_getpeername &
 1920     lwip_getsockname use now a common lwip_getaddrname function since 
 1921     netconn_peer & netconn_addr have the same parameters).
 1922 
 1923   2007-09-20 Simon Goldschmidt
 1924   * tcp.c: Fixed bug #21080 (tcp_bind without check pcbs in TIME_WAIT state)
 1925     by checking  tcp_tw_pcbs also
 1926 
 1927   2007-09-19 Simon Goldschmidt
 1928   * icmp.c: Fixed bug #21107 (didn't reset IP TTL in ICMP echo replies)
 1929 
 1930   2007-09-15 Mike Kleshov
 1931   * mem.c: Fixed bug #21077 (inaccuracy in calculation of lwip_stat.mem.used)
 1932 
 1933   2007-09-06 Frédéric Bernon
 1934   * several-files: replace some #include "arch/cc.h" by "lwip/arch.h", or simply remove
 1935     it as long as "lwip/opt.h" is included before (this one include "lwip/debug.h" which
 1936     already include "lwip/arch.h"). Like that, default defines are provided by "lwip/arch.h"
 1937     if they are not defined in cc.h, in the same spirit than "lwip/opt.h" for lwipopts.h.
 1938 
 1939   2007-08-30 Frédéric Bernon
 1940   * igmp.h, igmp.c: Some changes to remove some redundant code, add some traces, 
 1941     and fix some coding style.
 1942 
 1943   2007-08-28 Frédéric Bernon
 1944   * tcpip.c: Fix TCPIP_MSG_INPKT processing: now, tcpip_input can be used for any
 1945     kind of packets. These packets are considered like Ethernet packets (payload 
 1946     pointing to ethhdr) if the netif got the NETIF_FLAG_ETHARP flag. Else, packets 
 1947     are considered like IP packets (payload pointing to iphdr).
 1948 
 1949   2007-08-27 Frédéric Bernon
 1950   * api.h, api_lib.c, api_msg.c: First fix for "bug #20900 : Potential crash error
 1951     problem with netconn_peer & netconn_addr". Introduce NETCONN_LISTEN netconn_state
 1952     and remove obsolete ones (NETCONN_RECV & NETCONN_ACCEPT).
 1953 
 1954   2007-08-24 Kieran Mansley
 1955   * inet.c Modify (acc >> 16) test to ((acc >> 16) != 0) to help buggy
 1956     compiler (Paradigm C++)
 1957 
 1958   2007-08-09 Frédéric Bernon, Bill Florac
 1959   * stats.h, stats.c, igmp.h, igmp.c, opt.h: Fix for bug #20503 : IGMP Improvement.
 1960     Introduce IGMP_STATS to centralize statistics management.
 1961 
 1962   2007-08-09 Frédéric Bernon, Bill Florac
 1963   * udp.c: Fix for bug #20503 : IGMP Improvement. Enable to receive a multicast
 1964     packet on a udp pcb binded on an netif's IP address, and not on "any".
 1965 
 1966   2007-08-09 Frédéric Bernon, Bill Florac
 1967   * igmp.h, igmp.c, ip.c: Fix minor changes from bug #20503 : IGMP Improvement.
 1968     This is mainly on using lookup/lookfor, and some coding styles...
 1969 
 1970   2007-07-26 Frédéric Bernon (and "thedoctor")
 1971   * igmp.c: Fix bug #20595 to accept IGMPv3 "Query" messages.
 1972 
 1973   2007-07-25 Simon Goldschmidt
 1974   * api_msg.c, tcp.c: Another fix for bug #20021: by not returning an error if
 1975     tcp_output fails in tcp_close, the code in do_close_internal gets simpler
 1976     (tcp_output is called again later from tcp timers).
 1977 
 1978   2007-07-25 Simon Goldschmidt
 1979   * ip_frag.c: Fixed bug #20429: use the new pbuf_copy_partial instead of the old
 1980     copy_from_pbuf, which illegally modified the given pbuf.
 1981 
 1982   2007-07-25 Simon Goldschmidt
 1983   * tcp_out.c: tcp_enqueue: pcb->snd_queuelen didn't work for chaine PBUF_RAMs:
 1984     changed snd_queuelen++ to snd_queuelen += pbuf_clen(p).
 1985 
 1986   2007-07-24 Simon Goldschmidt
 1987   * api_msg.c, tcp.c: Fix bug #20480: Check the pcb passed to tcp_listen() for the
 1988     correct state (must be CLOSED).
 1989 
 1990   2007-07-13 Thomas Taranowski (commited by Jared Grubb)
 1991   * memp.c: Fix bug #20478: memp_malloc returned NULL+MEMP_SIZE on failed
 1992     allocation. It now returns NULL.
 1993 
 1994   2007-07-13 Frédéric Bernon
 1995   * api_msg.c: Fix bug #20318: api_msg "recv" callbacks don't call pbuf_free in
 1996     all error cases.
 1997 
 1998   2007-07-13 Frédéric Bernon
 1999   * api_msg.c: Fix bug #20315: possible memory leak problem if tcp_listen failed,
 2000     because current code doesn't follow rawapi.txt documentation.
 2001 
 2002   2007-07-13 Kieran Mansley
 2003   * src/core/tcp_in.c Apply patch#5741 from Oleg Tyshev to fix bug in
 2004     out of sequence processing of received packets
 2005 
 2006   2007-07-03 Simon Goldschmidt
 2007   * nearly-all-files: Added assertions where PBUF_RAM pbufs are used and an
 2008     assumption is made that this pbuf is in one piece (i.e. not chained). These
 2009     assumptions clash with the possibility of converting to fully pool-based
 2010     pbuf implementations, where PBUF_RAM pbufs might be chained.
 2011 
 2012   2007-07-03 Simon Goldschmidt
 2013   * api.h, api_lib.c, api_msg.c: Final fix for bug #20021 and some other problems
 2014     when closing tcp netconns: removed conn->sem, less context switches when
 2015     closing, both netconn_close and netconn_delete should safely close tcp
 2016     connections.
 2017 
 2018   2007-07-02 Simon Goldschmidt
 2019   * ipv4/ip.h, ipv6/ip.h, opt.h, netif.h, etharp.h, ipv4/ip.c, netif.c, raw.c,
 2020     tcp_out.c, udp.c, etharp.c: Added option LWIP_NETIF_HWADDRHINT (default=off)
 2021     to cache ARP table indices with each pcb instead of single-entry cache for
 2022     the complete stack.
 2023 
 2024   2007-07-02 Simon Goldschmidt
 2025   * tcp.h, tcp.c, tcp_in.c, tcp_out.c: Added some ASSERTS and casts to prevent
 2026     warnings when assigning to smaller types.
 2027 
 2028   2007-06-28 Simon Goldschmidt
 2029   * tcp_out.c: Added check to prevent tcp_pcb->snd_queuelen from overflowing.
 2030 
 2031   2007-06-28 Simon Goldschmidt
 2032   * tcp.h: Fixed bug #20287: Fixed nagle algorithm (sending was done too early if
 2033     a segment contained chained pbufs)
 2034 
 2035   2007-06-28 Frédéric Bernon
 2036   * autoip.c: replace most of rand() calls by a macro LWIP_AUTOIP_RAND which compute
 2037     a "pseudo-random" value based on netif's MAC and some autoip fields. It's always
 2038     possible to define this macro in your own lwipopts.h to always use C library's
 2039     rand(). Note that autoip_create_rand_addr doesn't use this macro.
 2040 
 2041   2007-06-28 Frédéric Bernon
 2042   * netifapi.h, netifapi.c, tcpip.h, tcpip.c: Update code to handle the option
 2043     LWIP_TCPIP_CORE_LOCKING, and do some changes to be coherent with last modifications
 2044     in api_lib/api_msg (use pointers and not type with table, etc...) 
 2045 
 2046   2007-06-26 Simon Goldschmidt
 2047   * udp.h: Fixed bug #20259: struct udp_hdr was lacking the packin defines.
 2048 
 2049   2007-06-25 Simon Goldschmidt
 2050   * udp.c: Fixed bug #20253: icmp_dest_unreach was called with a wrong p->payload
 2051     for udp packets with no matching pcb.
 2052 
 2053   2007-06-25 Simon Goldschmidt
 2054   * udp.c: Fixed bug #20220: UDP PCB search in udp_input(): a non-local match
 2055     could get udp input packets if the remote side matched.
 2056 
 2057   2007-06-13 Simon Goldschmidt
 2058   * netif.c: Fixed bug #20180 (TCP pcbs listening on IP_ADDR_ANY could get
 2059     changed in netif_set_ipaddr if previous netif->ip_addr.addr was 0.
 2060 
 2061   2007-06-13 Simon Goldschmidt
 2062   * api_msg.c: pcb_new sets conn->err if protocol is not implemented
 2063     -> netconn_new_..() does not allocate a new connection for unsupported
 2064     protocols.
 2065 
 2066   2007-06-13 Frédéric Bernon, Simon Goldschmidt
 2067   * api_lib.c: change return expression in netconn_addr and netconn_peer, because
 2068     conn->err was reset to ERR_OK without any reasons (and error was lost)...
 2069 
 2070   2007-06-13 Frédéric Bernon, Matthias Weisser
 2071   * opt.h, mem.h, mem.c, memp.c, pbuf.c, ip_frag.c, vj.c: Fix bug #20162. Rename
 2072     MEM_ALIGN in LWIP_MEM_ALIGN and MEM_ALIGN_SIZE in LWIP_MEM_ALIGN_SIZE to avoid
 2073     some macro names collision with some OS macros.
 2074 
 2075   2007-06-11 Simon Goldschmidt
 2076   * udp.c: UDP Lite: corrected the use of chksum_len (based on RFC3828: if it's 0,
 2077     create checksum over the complete packet. On RX, if it's < 8 (and not 0),
 2078     discard the packet. Also removed the duplicate 'udphdr->chksum = 0' for both
 2079     UDP & UDP Lite.
 2080 
 2081   2007-06-11 Srinivas Gollakota & Oleg Tyshev
 2082   * tcp_out.c: Fix for bug #20075 : "A problem with keep-alive timer and TCP flags"
 2083     where TCP flags wasn't initialized in tcp_keepalive.
 2084 
 2085   2007-06-03 Simon Goldschmidt
 2086   * udp.c: udp_input(): Input pbuf was not freed if pcb had no recv function
 2087     registered, p->payload was modified without modifying p->len if sending
 2088     icmp_dest_unreach() (had no negative effect but was definitively wrong).
 2089 
 2090   2007-06-03 Simon Goldschmidt
 2091   * icmp.c: Corrected bug #19937: For responding to an icmp echo request, icmp
 2092     re-used the input pbuf even if that didn't have enough space to include the
 2093     link headers. Now the space is tested and a new pbuf is allocated for the
 2094     echo response packet if the echo request pbuf isn't big enough.
 2095 
 2096   2007-06-01 Simon Goldschmidt
 2097   * sockets.c: Checked in patch #5914: Moved sockopt processing into tcpip_thread.
 2098 
 2099   2007-05-23 Frédéric Bernon
 2100   * api_lib.c, sockets.c: Fixed bug #5958 for netconn_listen (acceptmbox only
 2101     allocated by do_listen if success) and netconn_accept errors handling. In
 2102     most of api_lib functions, we replace some errors checkings like "if (conn==NULL)"
 2103     by ASSERT, except for netconn_delete.
 2104 
 2105   2007-05-23 Frédéric Bernon
 2106   * api_lib.c: Fixed bug #5957 "Safe-thread problem inside netconn_recv" to return
 2107     an error code if it's impossible to fetch a pbuf on a TCP connection (and not
 2108     directly close the recvmbox).
 2109 
 2110   2007-05-22 Simon Goldschmidt
 2111   * tcp.c: Fixed bug #1895 (tcp_bind not correct) by introducing a list of
 2112     bound but unconnected (and non-listening) tcp_pcbs.
 2113 
 2114   2007-05-22 Frédéric Bernon
 2115   * sys.h, sys.c, api_lib.c, tcpip.c: remove sys_mbox_fetch_timeout() (was only
 2116     used for LWIP_SO_RCVTIMEO option) and use sys_arch_mbox_fetch() instead of
 2117     sys_mbox_fetch() in api files. Now, users SHOULD NOT use internal lwIP features
 2118     like "sys_timeout" in their application threads.
 2119 
 2120   2007-05-22 Frédéric Bernon
 2121   * api.h, api_lib.c, api_msg.h, api_msg.c: change the struct api_msg_msg to see
 2122     which parameters are used by which do_xxx function, and to avoid "misusing"
 2123     parameters (patch #5938).
 2124 
 2125   2007-05-22 Simon Goldschmidt
 2126   * api_lib.c, api_msg.c, raw.c, api.h, api_msg.h, raw.h: Included patch #5938:
 2127     changed raw_pcb.protocol from u16_t to u8_t since for IPv4 and IPv6, proto
 2128     is only 8 bits wide. This affects the api, as there, the protocol was
 2129     u16_t, too.
 2130 
 2131   2007-05-18 Simon Goldschmidt
 2132   * memp.c: addition to patch #5913: smaller pointer was returned but
 2133     memp_memory was the same size -> did not save memory.
 2134 
 2135   2007-05-16 Simon Goldschmidt
 2136   * loopif.c, slipif.c: Fix bug #19729: free pbuf if netif->input() returns
 2137     != ERR_OK.
 2138 
 2139   2007-05-16 Simon Goldschmidt
 2140   * api_msg.c, udp.c: If a udp_pcb has a local_ip set, check if it is the same
 2141     as the one of the netif used for sending to prevent sending from old
 2142     addresses after a netif address gets changed (partly fixes bug #3168).
 2143 
 2144   2007-05-16 Frédéric Bernon
 2145   * tcpip.c, igmp.h, igmp.c: Fixed bug "#19800 : IGMP: igmp_tick() will not work
 2146     with NO_SYS=1". Note that igmp_init is always in tcpip_thread (and not in 
 2147     tcpip_init) because we have to be sure that network interfaces are already
 2148     added (mac filter is updated only in igmp_init for the moment).
 2149 
 2150   2007-05-16 Simon Goldschmidt
 2151   * mem.c, memp.c: Removed semaphores from memp, changed sys_sem_wait calls
 2152     into sys_arch_sem_wait calls to prevent timers from running while waiting
 2153     for the heap. This fixes bug #19167.
 2154 
 2155   2007-05-13 Simon Goldschmidt
 2156   * tcp.h, sockets.h, sockets.c: Fixed bug from patch #5865 by moving the defines
 2157     for socket options (lwip_set/-getsockopt) used with level IPPROTO_TCP from
 2158     tcp.h to sockets.h.
 2159 
 2160   2007-05-07 Simon Goldschmidt
 2161   * mem.c: Another attempt to fix bug #17922.
 2162 
 2163   2007-05-04 Simon Goldschmidt
 2164   * pbuf.c, pbuf.h, etharp.c: Further update to ARP queueing: Changed pbuf_copy()
 2165     implementation so that it can be reused (don't allocate the target
 2166     pbuf inside pbuf_copy()).
 2167 
 2168   2007-05-04 Simon Goldschmidt
 2169   * memp.c: checked in patch #5913: in memp_malloc() we can return memp as mem
 2170     to save a little RAM (next pointer of memp is not used while not in pool).
 2171 
 2172   2007-05-03 "maq"
 2173   * sockets.c: Fix ioctl FIONREAD when some data remains from last recv.
 2174     (patch #3574).
 2175 
 2176   2007-04-23 Simon Goldschmidt
 2177   * loopif.c, loopif.h, opt.h, src/netif/FILES: fix bug #2595: "loopif results
 2178     in NULL reference for incoming TCP packets". Loopif has to be configured
 2179     (using LWIP_LOOPIF_MULTITHREADING) to directly call netif->input()
 2180     (multithreading environments, e.g. netif->input() = tcpip_input()) or
 2181     putting packets on a list that is fed to the stack by calling loopif_poll()
 2182     (single-thread / NO_SYS / polling environment where e.g.
 2183     netif->input() = ip_input).
 2184 
 2185   2007-04-17 Jonathan Larmour
 2186   * pbuf.c: Use s32_t in pbuf_realloc(), as an s16_t can't reliably hold
 2187     the difference between two u16_t's.
 2188   * sockets.h: FD_SETSIZE needs to match number of sockets, which is
 2189     MEMP_NUM_NETCONN in sockets.c right now.
 2190 
 2191   2007-04-12 Jonathan Larmour
 2192   * icmp.c: Reset IP header TTL in ICMP ECHO responses (bug #19580).
 2193 
 2194   2007-04-12 Kieran Mansley
 2195   * tcp.c, tcp_in.c, tcp_out.c, tcp.h: Modify way the retransmission
 2196     timer is reset to fix bug#19434, with help from Oleg Tyshev.
 2197 
 2198   2007-04-11 Simon Goldschmidt
 2199   * etharp.c, pbuf.c, pbuf.h: 3rd fix for bug #11400 (arp-queuing): More pbufs than
 2200     previously thought need to be copied (everything but PBUF_ROM!). Cleaned up
 2201     pbuf.c: removed functions no needed any more (by etharp).
 2202 
 2203   2007-04-11 Kieran Mansley
 2204   * inet.c, ip_addr.h, sockets.h, sys.h, tcp.h: Apply patch #5745: Fix
 2205     "Constant is long" warnings with 16bit compilers.  Contributed by
 2206     avatar@mmlab.cse.yzu.edu.tw
 2207 
 2208   2007-04-05 Frédéric Bernon, Jonathan Larmour
 2209   * api_msg.c: Fix bug #16830: "err_tcp() posts to connection mailbox when no pend on
 2210     the mailbox is active". Now, the post is only done during a connect, and do_send,
 2211     do_write and do_join_leave_group don't do anything if a previous error was signaled.
 2212 
 2213   2007-04-03 Frédéric Bernon
 2214   * ip.c: Don't set the IP_DF ("Don't fragment") flag in the IP header in IP output
 2215     packets. See patch #5834.
 2216 
 2217   2007-03-30 Frédéric Bernon
 2218   * api_msg.c: add a "pcb_new" helper function to avoid redundant code, and to add
 2219     missing  pcb allocations checking (in do_bind, and for each raw_new). Fix style.
 2220 
 2221   2007-03-30 Frédéric Bernon
 2222   * most of files: prefix all debug.h define with "LWIP_" to avoid any conflict with
 2223     others environment defines (these were too "generic").
 2224 
 2225   2007-03-28 Frédéric Bernon
 2226   * api.h, api_lib.c, sockets.c: netbuf_ref doesn't check its internal pbuf_alloc call
 2227     result and can cause a crash. lwip_send now check netbuf_ref result.
 2228 
 2229   2007-03-28 Simon Goldschmidt
 2230   * sockets.c Remove "#include <errno.h>" from sockets.c to avoid multiple
 2231     definition of macros (in errno.h and lwip/arch.h) if LWIP_PROVIDE_ERRNO is
 2232     defined. This is the way it should have been already (looking at
 2233     doc/sys_arch.txt)
 2234 
 2235   2007-03-28 Kieran Mansley
 2236   * opt.h Change default PBUF_POOL_BUFSIZE (again) to accomodate default MSS +
 2237     IP and TCP headers *and* physical link headers
 2238 
 2239   2007-03-26 Frédéric Bernon (based on patch from Dmitry Potapov)
 2240   * api_lib.c: patch for netconn_write(), fixes a possible race condition which cause
 2241     to send some garbage. It is not a definitive solution, but the patch does solve
 2242     the problem for most cases.
 2243 
 2244   2007-03-22 Frédéric Bernon
 2245   * api_msg.h, api_msg.c: Remove obsolete API_MSG_ACCEPT and do_accept (never used).
 2246 
 2247   2007-03-22 Frédéric Bernon
 2248   * api_lib.c: somes resources couldn't be freed if there was errors during
 2249     netconn_new_with_proto_and_callback.
 2250 
 2251   2007-03-22 Frédéric Bernon
 2252   * ethernetif.c: update netif->input calls to check return value. In older ports,
 2253     it's a good idea to upgrade them, even if before, there could be another problem
 2254     (access to an uninitialized mailbox).
 2255 
 2256   2007-03-21 Simon Goldschmidt
 2257   * sockets.c: fixed bug #5067 (essentialy a signed/unsigned warning fixed
 2258     by casting to unsigned).
 2259 
 2260   2007-03-21 Frédéric Bernon
 2261   * api_lib.c, api_msg.c, tcpip.c: integrate sys_mbox_fetch(conn->mbox, NULL) calls from
 2262     api_lib.c to tcpip.c's tcpip_apimsg(). Now, use a local variable and not a
 2263     dynamic one from memp to send tcpip_msg to tcpip_thread in a synchrone call.
 2264     Free tcpip_msg from tcpip_apimsg is not done in tcpip_thread. This give a
 2265     faster and more reliable communication between api_lib and tcpip.
 2266 
 2267   2007-03-21 Frédéric Bernon
 2268   * opt.h: Add LWIP_NETIF_CALLBACK (to avoid compiler warning) and set it to 0.
 2269 
 2270   2007-03-21 Frédéric Bernon
 2271   * api_msg.c, igmp.c, igmp.h: Fix C++ style comments
 2272 
 2273   2007-03-21 Kieran Mansley
 2274   * opt.h Change default PBUF_POOL_BUFSIZE to accomodate default MSS +
 2275     IP and TCP headers
 2276 
 2277   2007-03-21 Kieran Mansley
 2278   * Fix all uses of pbuf_header to check the return value.  In some
 2279     cases just assert if it fails as I'm not sure how to fix them, but
 2280     this is no worse than before when they would carry on regardless
 2281     of the failure.
 2282 
 2283   2007-03-21 Kieran Mansley
 2284   * sockets.c, igmp.c, igmp.h, memp.h: Fix C++ style comments and
 2285     comment out missing header include in icmp.c
 2286 
 2287   2007-03-20 Frédéric Bernon
 2288   * memp.h, stats.c: Fix stats_display function where memp_names table wasn't
 2289     synchronized with memp.h.
 2290 
 2291   2007-03-20 Frédéric Bernon
 2292   * tcpip.c: Initialize tcpip's mbox, and verify if initialized in tcpip_input,
 2293     tcpip_ethinput, tcpip_callback, tcpip_apimsg, to fix a init problem with 
 2294     network interfaces. Also fix a compiler warning.
 2295 
 2296   2007-03-20 Kieran Mansley
 2297   * udp.c: Only try and use pbuf_header() to make space for headers if
 2298     not a ROM or REF pbuf.
 2299 
 2300   2007-03-19 Frédéric Bernon
 2301   * api_msg.h, api_msg.c, tcpip.h, tcpip.c: Add return types to tcpip_apimsg()
 2302     and api_msg_post().
 2303 
 2304   2007-03-19 Frédéric Bernon
 2305   * Remove unimplemented "memp_realloc" function from memp.h.
 2306 
 2307   2007-03-11 Simon Goldschmidt
 2308   * pbuf.c: checked in patch #5796: pbuf_alloc: len field claculation caused
 2309     memory corruption.
 2310 
 2311   2007-03-11 Simon Goldschmidt (based on patch from Dmitry Potapov)
 2312   * api_lib.c, sockets.c, api.h, api_msg.h, sockets.h: Fixed bug #19251
 2313     (missing `const' qualifier in socket functions), to get more compatible to
 2314     standard POSIX sockets.
 2315 
 2316   2007-03-11 Frédéric Bernon (based on patch from Dmitry Potapov)
 2317   * sockets.c: Add asserts inside bind, connect and sendto to check input
 2318     parameters. Remove excessive set_errno() calls after get_socket(), because
 2319     errno is set inside of get_socket(). Move last sock_set_errno() inside
 2320     lwip_close.
 2321 
 2322   2007-03-09 Simon Goldschmidt
 2323   * memp.c: Fixed bug #11400: New etharp queueing introduced bug: memp_memory
 2324     was allocated too small.
 2325 
 2326   2007-03-06 Simon Goldschmidt
 2327   * tcpip.c: Initialize dhcp timers in tcpip_thread (if LWIP_DHCP) to protect
 2328     the stack from concurrent access.
 2329 
 2330   2007-03-06 Frédéric Bernon, Dmitry Potapov
 2331   * tcpip.c, ip_frag.c, ethernetif.c: Fix some build problems, and a redundancy
 2332     call to "lwip_stats.link.recv++;" in low_level_input() & ethernetif_input().
 2333 
 2334   2007-03-06 Simon Goldschmidt
 2335   * ip_frag.c, ip_frag.h: Reduce code size: don't include code in those files
 2336     if IP_FRAG == 0 and IP_REASSEMBLY == 0
 2337 
 2338   2007-03-06 Frédéric Bernon, Simon Goldschmidt
 2339   * opt.h, ip_frag.h, tcpip.h, tcpip.c, ethernetif.c: add new configuration
 2340     option named ETHARP_TCPIP_ETHINPUT, which enable the new tcpip_ethinput.
 2341     Allow to do ARP processing for incoming packets inside tcpip_thread
 2342     (protecting ARP layer against concurrent access). You can also disable
 2343     old code using tcp_input with new define ETHARP_TCPIP_INPUT set to 0.
 2344     Older ports have to use tcpip_ethinput.
 2345 
 2346   2007-03-06 Simon Goldschmidt (based on patch from Dmitry Potapov)
 2347   * err.h, err.c: fixed compiler warning "initialization dircards qualifiers
 2348     from pointer target type"
 2349 
 2350   2007-03-05 Frédéric Bernon
 2351   * opt.h, sockets.h: add new configuration options (LWIP_POSIX_SOCKETS_IO_NAMES,
 2352     ETHARP_TRUST_IP_MAC, review SO_REUSE)
 2353 
 2354   2007-03-04 Frédéric Bernon
 2355   * api_msg.c: Remove some compiler warnings : parameter "pcb" was never
 2356     referenced.
 2357 
 2358   2007-03-04 Frédéric Bernon
 2359   * api_lib.c: Fix "[patch #5764] api_lib.c cleanup: after patch #5687" (from
 2360     Dmitry Potapov).
 2361     The api_msg struct stay on the stack (not moved to netconn struct).
 2362 
 2363   2007-03-04 Simon Goldschmidt (based on patch from Dmitry Potapov)
 2364   * pbuf.c: Fix BUG#19168 - pbuf_free can cause deadlock (if
 2365     SYS_LIGHTWEIGHT_PROT=1 & freeing PBUF_RAM when mem_sem is not available)
 2366     Also fixed cast warning in pbuf_alloc()
 2367 
 2368   2007-03-04 Simon Goldschmidt
 2369   * etharp.c, etharp.h, memp.c, memp.h, opt.h: Fix BUG#11400 - don't corrupt
 2370     existing pbuf chain when enqueuing multiple pbufs to a pending ARP request
 2371 
 2372   2007-03-03 Frédéric Bernon
 2373   * udp.c: remove obsolete line "static struct udp_pcb *pcb_cache = NULL;"
 2374     It is static, and never used in udp.c except udp_init().
 2375 
 2376   2007-03-02 Simon Goldschmidt
 2377   * tcpip.c: Moved call to ip_init(), udp_init() and tcp_init() from
 2378     tcpip_thread() to tcpip_init(). This way, raw API connections can be
 2379     initialized before tcpip_thread is running (e.g. before OS is started)
 2380 
 2381   2007-03-02 Frédéric Bernon
 2382   * rawapi.txt: Fix documentation mismatch with etharp.h about etharp_tmr's call
 2383     interval.
 2384 
 2385   2007-02-28 Kieran Mansley 
 2386   * pbuf.c: Fix BUG#17645 - ensure pbuf payload pointer is not moved
 2387     outside the region of the pbuf by pbuf_header()
 2388 
 2389   2007-02-28 Kieran Mansley 
 2390   * sockets.c: Fix BUG#19161 - ensure milliseconds timeout is non-zero
 2391     when supplied timeout is also non-zero 
 2392 
 2393 (STABLE-1.2.0)
 2394 
 2395   2006-12-05 Leon Woestenberg
 2396   * CHANGELOG: Mention STABLE-1.2.0 release.
 2397 
 2398   ++ New features:
 2399 
 2400   2006-12-01 Christiaan Simons
 2401   * mem.h, opt.h: Added MEM_LIBC_MALLOC option.
 2402     Note this is a workaround. Currently I have no other options left.
 2403 
 2404   2006-10-26 Christiaan Simons (accepted patch by Jonathan Larmour)
 2405   * ipv4/ip_frag.c: rename MAX_MTU to IP_FRAG_MAX_MTU and move define
 2406     to include/lwip/opt.h.
 2407   * ipv4/lwip/ip_frag.h: Remove unused IP_REASS_INTERVAL.
 2408     Move IP_REASS_MAXAGE and IP_REASS_BUFSIZE to include/lwip/opt.h.
 2409   * opt.h: Add above new options.
 2410 
 2411   2006-08-18 Christiaan Simons
 2412   * tcp_{in,out}.c: added SNMP counters.
 2413   * ipv4/ip.c: added SNMP counters.
 2414   * ipv4/ip_frag.c: added SNMP counters.
 2415 
 2416   2006-08-08 Christiaan Simons
 2417   * etharp.{c,h}: added etharp_find_addr() to read
 2418     (stable) ethernet/IP address pair from ARP table
 2419 
 2420   2006-07-14 Christiaan Simons
 2421   * mib_structs.c: added
 2422   * include/lwip/snmp_structs.h: added
 2423   * netif.{c,h}, netif/ethernetif.c: added SNMP statistics to netif struct
 2424 
 2425   2006-07-06 Christiaan Simons
 2426   * snmp/asn1_{enc,dec}.c added
 2427   * snmp/mib2.c added
 2428   * snmp/msg_{in,out}.c added
 2429   * include/lwip/snmp_asn1.h added
 2430   * include/lwip/snmp_msg.h added
 2431   * doc/snmp_agent.txt added
 2432 
 2433   2006-03-29 Christiaan Simons
 2434   * inet.c, inet.h: Added platform byteswap support.
 2435     Added LWIP_PLATFORM_BYTESWAP define (defaults to 0) and
 2436     optional LWIP_PLATFORM_HTONS(), LWIP_PLATFORM_HTONL() macros.
 2437 
 2438   ++ Bug fixes:
 2439 
 2440   2006-11-30 Christiaan Simons
 2441   * dhcp.c: Fixed false triggers of request_timeout.
 2442 
 2443   2006-11-28 Christiaan Simons
 2444   * netif.c: In netif_add() fixed missing clear of ip_addr, netmask, gw and flags.
 2445 
 2446   2006-10-11 Christiaan Simons
 2447   * api_lib.c etharp.c, ip.c, memp.c, stats.c, sys.{c,h} tcp.h:
 2448     Partially accepted patch #5449 for ANSI C compatibility / build fixes.
 2449   * ipv4/lwip/ip.h ipv6/lwip/ip.h: Corrected UDP-Lite protocol
 2450     identifier from 170 to 136 (bug #17574).
 2451 
 2452   2006-10-10 Christiaan Simons
 2453   * api_msg.c: Fixed Nagle algorithm as reported by Bob Grice.
 2454 
 2455   2006-08-17 Christiaan Simons
 2456   * udp.c: Fixed bug #17200, added check for broadcast
 2457     destinations for PCBs bound to a unicast address.
 2458 
 2459   2006-08-07 Christiaan Simons
 2460   * api_msg.c: Flushing TCP output in do_close() (bug #15926).
 2461 
 2462   2006-06-27 Christiaan Simons
 2463   * api_msg.c: Applied patch for cold case (bug #11135).
 2464     In accept_function() ensure newconn->callback is always initialized.
 2465 
 2466   2006-06-15 Christiaan Simons
 2467   * mem.h: added MEM_SIZE_F alias to fix an ancient cold case (bug #1748),
 2468     facilitate printing of mem_size_t and u16_t statistics.
 2469 
 2470   2006-06-14 Christiaan Simons
 2471   * api_msg.c: Applied patch #5146 to handle allocation failures
 2472     in accept() by Kevin Lawson.
 2473 
 2474   2006-05-26 Christiaan Simons
 2475   * api_lib.c: Removed conn->sem creation and destruction 
 2476     from netconn_write() and added sys_sem_new to netconn_new_*.
 2477 
 2478 (STABLE-1_1_1)
 2479 
 2480   2006-03-03  Christiaan Simons
 2481   * ipv4/ip_frag.c: Added bound-checking assertions on ip_reassbitmap
 2482     access and added pbuf_alloc() return value checks.
 2483 
 2484   2006-01-01  Leon Woestenberg <leon.woestenberg@gmx.net>
 2485   * tcp_{in,out}.c, tcp_out.c: Removed 'even sndbuf' fix in TCP, which is
 2486     now handled by the checksum routine properly.
 2487 
 2488   2006-02-27  Leon Woestenberg <leon.woestenberg@gmx.net>
 2489    * pbuf.c: Fix alignment; pbuf_init() would not work unless
 2490      pbuf_pool_memory[] was properly aligned. (Patch by Curt McDowell.)
 2491 
 2492   2005-12-20  Leon Woestenberg <leon.woestenberg@gmx.net>
 2493   * tcp.c: Remove PCBs which stay in LAST_ACK state too long. Patch
 2494     submitted by Mitrani Hiroshi.
 2495 
 2496   2005-12-15  Christiaan Simons
 2497   * inet.c: Disabled the added summing routine to preserve code space.
 2498 
 2499   2005-12-14  Leon Woestenberg <leon.woestenberg@gmx.net>
 2500   * tcp_in.c: Duplicate FIN ACK race condition fix by Kelvin Lawson.
 2501     Added Curt McDowell's optimized checksumming routine for future
 2502     inclusion. Need to create test case for unaliged, aligned, odd,
 2503     even length combination of cases on various endianess machines.
 2504 
 2505   2005-12-09  Christiaan Simons
 2506   * inet.c: Rewrote standard checksum routine in proper portable C.
 2507 
 2508   2005-11-25  Christiaan Simons
 2509   * udp.c tcp.c: Removed SO_REUSE hack. Should reside in socket code only.
 2510   * *.c: introduced cc.h LWIP_DEBUG formatters matching the u16_t, s16_t,
 2511     u32_t, s32_t typedefs. This solves most debug word-length assumes.
 2512 
 2513   2005-07-17 Leon Woestenberg <leon.woestenberg@gmx.net>
 2514   * inet.c: Fixed unaligned 16-bit access in the standard checksum
 2515     routine by Peter Jolasson.
 2516   * slipif.c: Fixed implementation assumption of single-pbuf datagrams.
 2517 
 2518   2005-02-04 Leon Woestenberg <leon.woestenberg@gmx.net>
 2519   * tcp_out.c: Fixed uninitialized 'queue' referenced in memerr branch.
 2520   * tcp_{out|in}.c: Applied patch fixing unaligned access.
 2521 
 2522   2005-01-04 Leon Woestenberg <leon.woestenberg@gmx.net>
 2523   * pbuf.c: Fixed missing semicolon after LWIP_DEBUG statement.
 2524 
 2525   2005-01-03 Leon Woestenberg <leon.woestenberg@gmx.net>
 2526   * udp.c: UDP pcb->recv() was called even when it was NULL.
 2527 
 2528 (STABLE-1_1_0)
 2529 
 2530   2004-12-28 Leon Woestenberg <leon.woestenberg@gmx.net>
 2531   * etharp.*: Disabled multiple packets on the ARP queue.
 2532     This clashes with TCP queueing.
 2533 
 2534   2004-11-28 Leon Woestenberg <leon.woestenberg@gmx.net>
 2535   * etharp.*: Fixed race condition from ARP request to ARP timeout.
 2536     Halved the ARP period, doubled the period counts.
 2537     ETHARP_MAX_PENDING now should be at least 2. This prevents
 2538     the counter from reaching 0 right away (which would allow
 2539     too little time for ARP responses to be received).
 2540 
 2541   2004-11-25 Leon Woestenberg <leon.woestenberg@gmx.net>
 2542   * dhcp.c: Decline messages were not multicast but unicast.
 2543   * etharp.c: ETHARP_CREATE is renamed to ETHARP_TRY_HARD.
 2544     Do not try hard to insert arbitrary packet's source address,
 2545     etharp_ip_input() now calls etharp_update() without ETHARP_TRY_HARD. 
 2546     etharp_query() now always DOES call ETHARP_TRY_HARD so that users
 2547     querying an address will see it appear in the cache (DHCP could
 2548     suffer from this when a server invalidly gave an in-use address.)
 2549   * ipv4/ip_addr.h: Renamed ip_addr_maskcmp() to _netcmp() as we are
 2550     comparing network addresses (identifiers), not the network masks
 2551     themselves.
 2552   * ipv4/ip_addr.c: ip_addr_isbroadcast() now checks that the given
 2553     IP address actually belongs to the network of the given interface.
 2554 
 2555   2004-11-24 Kieran Mansley <kjm25@cam.ac.uk>
 2556   * tcp.c: Increment pcb->snd_buf when ACK is received in SYN_SENT state.
 2557 
 2558 (STABLE-1_1_0-RC1)
 2559 
 2560   2004-10-16 Kieran Mansley <kjm25@cam.ac.uk>
 2561   * tcp.c: Add code to tcp_recved() to send an ACK (window update) immediately,
 2562     even if one is already pending, if the rcv_wnd is above a threshold
 2563     (currently TCP_WND/2). This avoids waiting for a timer to expire to send a
 2564     delayed ACK in order to open the window if the stack is only receiving data.
 2565 
 2566   2004-09-12 Kieran Mansley <kjm25@cam.ac.uk>
 2567   * tcp*.*: Retransmit time-out handling improvement by Sam Jansen.
 2568 
 2569   2004-08-20 Tony Mountifield <tony@softins.co.uk>
 2570   * etharp.c: Make sure the first pbuf queued on an ARP entry
 2571     is properly ref counted.
 2572 
 2573   2004-07-27 Tony Mountifield <tony@softins.co.uk>
 2574   * debug.h: Added (int) cast in LWIP_DEBUGF() to avoid compiler
 2575     warnings about comparison.
 2576   * pbuf.c: Stopped compiler complaining of empty if statement
 2577     when LWIP_DEBUGF() empty.  Closed an unclosed comment.
 2578   * tcp.c: Stopped compiler complaining of empty if statement
 2579     when LWIP_DEBUGF() empty.
 2580   * ip.h Corrected IPH_TOS() macro: returns a byte, so doesn't need htons().
 2581   * inet.c: Added a couple of casts to quiet the compiler.
 2582     No need to test isascii(c) before isdigit(c) or isxdigit(c).
 2583 
 2584   2004-07-22 Tony Mountifield <tony@softins.co.uk>
 2585   * inet.c: Made data types consistent in inet_ntoa().
 2586     Added casts for return values of checksum routines, to pacify compiler.
 2587   * ip_frag.c, tcp_out.c, sockets.c, pbuf.c
 2588     Small corrections to some debugging statements, to pacify compiler.
 2589 
 2590   2004-07-21 Tony Mountifield <tony@softins.co.uk>
 2591   * etharp.c: Removed spurious semicolon and added missing end-of-comment.
 2592   * ethernetif.c Updated low_level_output() to match prototype for
 2593     netif->linkoutput and changed low_level_input() similarly for consistency.
 2594   * api_msg.c: Changed recv_raw() from int to u8_t, to match prototype
 2595     of raw_recv() in raw.h and so avoid compiler error.
 2596   * sockets.c: Added trivial (int) cast to keep compiler happier.
 2597   * ip.c, netif.c Changed debug statements to use the tidier ip4_addrN() macros.
 2598 
 2599 (STABLE-1_0_0)
 2600 
 2601   ++ Changes:
 2602 
 2603   2004-07-05 Leon Woestenberg <leon.woestenberg@gmx.net>
 2604   * sockets.*: Restructured LWIP_PRIVATE_TIMEVAL. Make sure
 2605     your cc.h file defines this either 1 or 0. If non-defined,
 2606     defaults to 1.
 2607   * .c: Added <string.h> and <errno.h> includes where used.
 2608   * etharp.c: Made some array indices unsigned.
 2609 
 2610   2004-06-27 Leon Woestenberg <leon.woestenberg@gmx.net>
 2611   * netif.*: Added netif_set_up()/down().
 2612   * dhcp.c: Changes to restart program flow.
 2613 
 2614   2004-05-07 Leon Woestenberg <leon.woestenberg@gmx.net>
 2615   * etharp.c: In find_entry(), instead of a list traversal per candidate, do a
 2616     single-pass lookup for different candidates. Should exploit locality.
 2617 
 2618   2004-04-29 Leon Woestenberg <leon.woestenberg@gmx.net>
 2619   * tcp*.c: Cleaned up source comment documentation for Doxygen processing.
 2620   * opt.h: ETHARP_ALWAYS_INSERT option removed to comply with ARP RFC.
 2621   * etharp.c: update_arp_entry() only adds new ARP entries when adviced to by
 2622     the caller. This deprecates the ETHARP_ALWAYS_INSERT overrule option.
 2623 
 2624   ++ Bug fixes:
 2625 
 2626   2004-04-27 Leon Woestenberg <leon.woestenberg@gmx.net>
 2627   * etharp.c: Applied patch of bug #8708 by Toni Mountifield with a solution
 2628     suggested by Timmy Brolin. Fix for 32-bit processors that cannot access
 2629     non-aligned 32-bit words, such as soms 32-bit TCP/IP header fields. Fix
 2630     is to prefix the 14-bit Ethernet headers with two padding bytes.
 2631 
 2632   2004-04-23 Leon Woestenberg <leon.woestenberg@gmx.net>
 2633   * ip_addr.c: Fix in the ip_addr_isbroadcast() check.
 2634   * etharp.c: Fixed the case where the packet that initiates the ARP request
 2635     is not queued, and gets lost. Fixed the case where the packets destination
 2636     address is already known; we now always queue the packet and perform an ARP
 2637     request.
 2638 
 2639 (STABLE-0_7_0)
 2640 
 2641   ++ Bug fixes:
 2642 
 2643   * Fixed TCP bug for SYN_SENT to ESTABLISHED state transition.
 2644   * Fixed TCP bug in dequeueing of FIN from out of order segment queue.
 2645   * Fixed two possible NULL references in rare cases.
 2646 
 2647 (STABLE-0_6_6)
 2648 
 2649   ++ Bug fixes:
 2650 
 2651   * Fixed DHCP which did not include the IP address in DECLINE messages.
 2652 
 2653   ++ Changes:
 2654 
 2655   * etharp.c has been hauled over a bit.
 2656 
 2657 (STABLE-0_6_5)
 2658 
 2659   ++ Bug fixes:
 2660 
 2661   * Fixed TCP bug induced by bad window resizing with unidirectional TCP traffic.
 2662   * Packets sent from ARP queue had invalid source hardware address.
 2663 
 2664   ++ Changes:
 2665 
 2666   * Pass-by ARP requests do now update the cache.
 2667 
 2668   ++ New features:
 2669 
 2670   * No longer dependent on ctype.h.
 2671   * New socket options.
 2672   * Raw IP pcb support.
 2673 
 2674 (STABLE-0_6_4)
 2675 
 2676   ++ Bug fixes:
 2677 
 2678   * Some debug formatters and casts fixed.
 2679   * Numereous fixes in PPP.
 2680 
 2681   ++ Changes:
 2682 
 2683   * DEBUGF now is LWIP_DEBUGF
 2684   * pbuf_dechain() has been re-enabled.
 2685   * Mentioned the changed use of CVS branches in README.
 2686 
 2687 (STABLE-0_6_3)
 2688 
 2689   ++ Bug fixes:
 2690 
 2691   * Fixed pool pbuf memory leak in pbuf_alloc().
 2692     Occured if not enough PBUF_POOL pbufs for a packet pbuf chain.
 2693     Reported by Savin Zlobec.
 2694 
 2695   * PBUF_POOL chains had their tot_len field not set for non-first
 2696     pbufs. Fixed in pbuf_alloc().
 2697 
 2698   ++ New features:
 2699 
 2700   * Added PPP stack contributed by Marc Boucher
 2701 
 2702   ++ Changes:
 2703 
 2704   * Now drops short packets for ICMP/UDP/TCP protocols. More robust.
 2705 
 2706   * ARP queueuing now queues the latest packet instead of the first.
 2707     This is the RFC recommended behaviour, but can be overridden in
 2708     lwipopts.h.
 2709 
 2710 (0.6.2)
 2711 
 2712   ++ Bugfixes:
 2713 
 2714   * TCP has been fixed to deal with the new use of the pbuf->ref
 2715     counter.
 2716 
 2717   * DHCP dhcp_inform() crash bug fixed.
 2718 
 2719   ++ Changes:
 2720 
 2721   * Removed pbuf_pool_free_cache and pbuf_pool_alloc_cache. Also removed
 2722     pbuf_refresh(). This has sped up pbuf pool operations considerably.
 2723     Implemented by David Haas.
 2724 
 2725 (0.6.1)
 2726 
 2727   ++ New features:
 2728 
 2729   * The packet buffer implementation has been enhanced to support
 2730     zero-copy and copy-on-demand for packet buffers which have their
 2731     payloads in application-managed memory.
 2732     Implemented by David Haas.
 2733 
 2734     Use PBUF_REF to make a pbuf refer to RAM. lwIP will use zero-copy
 2735     if an outgoing packet can be directly sent on the link, or perform
 2736     a copy-on-demand when necessary.
 2737 
 2738     The application can safely assume the packet is sent, and the RAM
 2739     is available to the application directly after calling udp_send()
 2740     or similar function.
 2741 
 2742   ++ Bugfixes:
 2743 
 2744   * ARP_QUEUEING should now correctly work for all cases, including
 2745     PBUF_REF.
 2746     Implemented by Leon Woestenberg.
 2747 
 2748   ++ Changes:
 2749 
 2750   * IP_ADDR_ANY is no longer a NULL pointer. Instead, it is a pointer
 2751     to a '0.0.0.0' IP address.
 2752 
 2753   * The packet buffer implementation is changed. The pbuf->ref counter
 2754     meaning has changed, and several pbuf functions have been
 2755     adapted accordingly.
 2756 
 2757   * netif drivers have to be changed to set the hardware address length field
 2758     that must be initialized correctly by the driver (hint: 6 for Ethernet MAC).
 2759     See the contrib/ports/c16x cs8900 driver as a driver example.
 2760 
 2761   * netif's have a dhcp field that must be initialized to NULL by the driver.
 2762     See the contrib/ports/c16x cs8900 driver as a driver example.
 2763 
 2764 (0.5.x) This file has been unmaintained up to 0.6.1. All changes are
 2765   logged in CVS but have not been explained here.
 2766 
 2767 (0.5.3) Changes since version 0.5.2
 2768 
 2769   ++ Bugfixes:
 2770 
 2771   * memp_malloc(MEMP_API_MSG) could fail with multiple application
 2772     threads because it wasn't protected by semaphores.
 2773 
 2774   ++ Other changes:
 2775 
 2776   * struct ip_addr now packed.
 2777 
 2778   * The name of the time variable in arp.c has been changed to ctime
 2779     to avoid conflicts with the time() function.
 2780 
 2781 (0.5.2) Changes since version 0.5.1
 2782 
 2783   ++ New features:
 2784 
 2785   * A new TCP function, tcp_tmr(), now handles both TCP timers.
 2786 
 2787   ++ Bugfixes:
 2788 
 2789   * A bug in tcp_parseopt() could cause the stack to hang because of a
 2790     malformed TCP option.
 2791 
 2792   * The address of new connections in the accept() function in the BSD
 2793     socket library was not handled correctly.
 2794 
 2795   * pbuf_dechain() did not update the ->tot_len field of the tail.
 2796 
 2797   * Aborted TCP connections were not handled correctly in all
 2798     situations.
 2799 
 2800   ++ Other changes:
 2801 
 2802   * All protocol header structs are now packed.
 2803 
 2804   * The ->len field in the tcp_seg structure now counts the actual
 2805     amount of data, and does not add one for SYN and FIN segments.
 2806 
 2807 (0.5.1) Changes since version 0.5.0
 2808 
 2809   ++ New features:
 2810 
 2811   * Possible to run as a user process under Linux.
 2812 
 2813   * Preliminary support for cross platform packed structs.
 2814 
 2815   * ARP timer now implemented.
 2816 
 2817   ++ Bugfixes:
 2818 
 2819   * TCP output queue length was badly initialized when opening
 2820     connections.
 2821 
 2822   * TCP delayed ACKs were not sent correctly.
 2823 
 2824   * Explicit initialization of BSS segment variables.
 2825 
 2826   * read() in BSD socket library could drop data.
 2827 
 2828   * Problems with memory alignment.
 2829 
 2830   * Situations when all TCP buffers were used could lead to
 2831     starvation.
 2832 
 2833   * TCP MSS option wasn't parsed correctly.
 2834 
 2835   * Problems with UDP checksum calculation.
 2836 
 2837   * IP multicast address tests had endianess problems.
 2838 
 2839   * ARP requests had wrong destination hardware address.
 2840 
 2841   ++ Other changes:
 2842 
 2843   * struct eth_addr changed from u16_t[3] array to u8_t[6].
 2844 
 2845   * A ->linkoutput() member was added to struct netif.
 2846 
 2847   * TCP and UDP ->dest_* struct members where changed to ->remote_*.
 2848 
 2849   * ntoh* macros are now null definitions for big endian CPUs.
 2850 
 2851 (0.5.0) Changes since version 0.4.2
 2852 
 2853   ++ New features:
 2854 
 2855   * Redesigned operating system emulation layer to make porting easier.
 2856 
 2857   * Better control over TCP output buffers.
 2858 
 2859   * Documenation added.
 2860 
 2861   ++ Bugfixes:
 2862 
 2863   * Locking issues in buffer management.
 2864 
 2865   * Bugfixes in the sequential API.
 2866 
 2867   * IP forwarding could cause memory leakage. This has been fixed.
 2868 
 2869   ++ Other changes:
 2870 
 2871   * Directory structure somewhat changed; the core/ tree has been
 2872     collapsed.
 2873 
 2874 (0.4.2) Changes since version 0.4.1
 2875 
 2876   ++ New features:
 2877 
 2878   * Experimental ARP implementation added.
 2879 
 2880   * Skeleton Ethernet driver added.
 2881 
 2882   * Experimental BSD socket API library added.
 2883 
 2884   ++ Bugfixes:
 2885 
 2886   * In very intense situations, memory leakage could occur. This has
 2887     been fixed.
 2888 
 2889   ++ Other changes:
 2890 
 2891   * Variables named "data" and "code" have been renamed in order to
 2892     avoid name conflicts in certain compilers.
 2893 
 2894   * Variable++ have in appliciable cases been translated to ++variable
 2895     since some compilers generate better code in the latter case.
 2896 
 2897 (0.4.1) Changes since version 0.4
 2898 
 2899   ++ New features:
 2900 
 2901   * TCP: Connection attempts time out earlier than data
 2902     transmissions. Nagle algorithm implemented. Push flag set on the
 2903     last segment in a burst.
 2904 
 2905   * UDP: experimental support for UDP-Lite extensions.
 2906 
 2907   ++ Bugfixes:
 2908 
 2909   * TCP: out of order segments were in some cases handled incorrectly,
 2910     and this has now been fixed. Delayed acknowledgements was broken
 2911     in 0.4, has now been fixed. Binding to an address that is in use
 2912     now results in an error. Reset connections sometimes hung an
 2913     application; this has been fixed.
 2914 
 2915   * Checksum calculation sometimes failed for chained pbufs with odd
 2916     lengths. This has been fixed.
 2917 
 2918   * API: a lot of bug fixes in the API. The UDP API has been improved
 2919     and tested. Error reporting and handling has been
 2920     improved. Logical flaws and race conditions for incoming TCP
 2921     connections has been found and removed.
 2922 
 2923   * Memory manager: alignment issues. Reallocating memory sometimes
 2924     failed, this has been fixed.
 2925 
 2926   * Generic library: bcopy was flawed and has been fixed.
 2927 
 2928   ++ Other changes:
 2929 
 2930   * API: all datatypes has been changed from generic ones such as
 2931     ints, to specified ones such as u16_t. Functions that return
 2932     errors now have the correct type (err_t).
 2933 
 2934   * General: A lot of code cleaned up and debugging code removed. Many
 2935     portability issues have been fixed.
 2936 
 2937   * The license was changed; the advertising clause was removed.
 2938 
 2939   * C64 port added.
 2940 
 2941   * Thanks: Huge thanks go to Dagan Galarneau, Horst Garnetzke, Petri
 2942     Kosunen, Mikael Caleres, and Frits Wilmink for reporting and
 2943     fixing bugs!
 2944 
 2945 (0.4) Changes since version 0.3.1
 2946 
 2947   * Memory management has been radically changed; instead of
 2948     allocating memory from a shared heap, memory for objects that are
 2949     rapidly allocated and deallocated is now kept in pools. Allocation
 2950     and deallocation from those memory pools is very fast. The shared
 2951     heap is still present but is used less frequently.
 2952 
 2953   * The memory, memory pool, and packet buffer subsystems now support
 2954     4-, 2-, or 1-byte alignment.
 2955 
 2956   * "Out of memory" situations are handled in a more robust way.
 2957 
 2958   * Stack usage has been reduced.
 2959 
 2960   * Easier configuration of lwIP parameters such as memory usage,
 2961     TTLs, statistics gathering, etc. All configuration parameters are
 2962     now kept in a single header file "lwipopts.h".
 2963 
 2964   * The directory structure has been changed slightly so that all
 2965     architecture specific files are kept under the src/arch
 2966     hierarchy.
 2967 
 2968   * Error propagation has been improved, both in the protocol modules
 2969     and in the API.
 2970 
 2971   * The code for the RTXC architecture has been implemented, tested
 2972     and put to use.
 2973 
 2974   * Bugs have been found and corrected in the TCP, UDP, IP, API, and
 2975     the Internet checksum modules.
 2976 
 2977   * Bugs related to porting between a 32-bit and a 16-bit architecture
 2978     have been found and corrected.
 2979 
 2980   * The license has been changed slightly to conform more with the
 2981     original BSD license, including the advertisement clause.
 2982 
 2983 (0.3.1) Changes since version 0.3
 2984 
 2985   * Fix of a fatal bug in the buffer management. Pbufs with allocated
 2986     RAM never returned the RAM when the pbuf was deallocated.
 2987 
 2988   * TCP congestion control, window updates and retransmissions did not
 2989     work correctly. This has now been fixed.
 2990 
 2991   * Bugfixes in the API.
 2992 
 2993 (0.3) Changes since version 0.2
 2994 
 2995   * New and improved directory structure. All include files are now
 2996     kept in a dedicated include/ directory.
 2997 
 2998   * The API now has proper error handling. A new function,
 2999     netconn_err(), now returns an error code for the connection in
 3000     case of errors.
 3001 
 3002   * Improvements in the memory management subsystem. The system now
 3003     keeps a pointer to the lowest free memory block. A new function,
 3004     mem_malloc2() tries to allocate memory once, and if it fails tries
 3005     to free some memory and retry the allocation.
 3006 
 3007   * Much testing has been done with limited memory
 3008     configurations. lwIP now does a better job when overloaded.
 3009 
 3010   * Some bugfixes and improvements to the buffer (pbuf) subsystem.
 3011 
 3012   * Many bugfixes in the TCP code:
 3013 
 3014     - Fixed a bug in tcp_close().
 3015 
 3016     - The TCP receive window was incorrectly closed when out of
 3017       sequence segments was received. This has been fixed.
 3018 
 3019     - Connections are now timed-out of the FIN-WAIT-2 state.
 3020 
 3021     - The initial congestion window could in some cases be too
 3022       large. This has been fixed.
 3023 
 3024     - The retransmission queue could in some cases be screwed up. This
 3025       has been fixed.
 3026 
 3027     - TCP RST flag now handled correctly.
 3028 
 3029     - Out of sequence data was in some cases never delivered to the
 3030       application. This has been fixed.
 3031 
 3032     - Retransmitted segments now contain the correct acknowledgment
 3033       number and advertised window.
 3034 
 3035     - TCP retransmission timeout backoffs are not correctly computed
 3036       (ala BSD). After a number of retransmissions, TCP now gives up
 3037       the connection.
 3038 
 3039   * TCP connections now are kept on three lists, one for active
 3040     connections, one for listening connections, and one for
 3041     connections that are in TIME-WAIT. This greatly speeds up the fast
 3042     timeout processing for sending delayed ACKs.
 3043 
 3044   * TCP now provides proper feedback to the application when a
 3045     connection has been successfully set up.
 3046 
 3047   * More comments have been added to the code. The code has also been
 3048     somewhat cleaned up.
 3049 
 3050 (0.2) Initial public release.