This file lists major changes between release versions that require ports or applications to be changed. Use it to update a port or an application written for an older version of lwIP to correctly work with newer versions. (git master) * [Enter new changes just after this line - do not remove this line] ++ Application changes: * MDNS: Functions mdns_resp_add_netif() and mdns_resp_add_service() do not automatically announce any more. Users need to call mdns_resp_announce() after adding netifs or services. * TCP only kills existing connections with a LOWER priority than the one currently being opened. Previous implementations also kill existing connections of the SAME priority. * ip4_route_src: parameter order is reversed: ip4_route_src(dest, src) -> ip4_route_src(src, dest) to make parameter order consistent with other ip*_route*() functions. Same also applies to LWIP_HOOK_IP4_ROUTE_SRC() parameter order. * pbuf API: pbuf->type (an u8_t holding the enum 'pbuf_type') has changed to only hold a description of the pbuf (e.g. data following pbuf struct, data volatile, allocation source heap/pool/etc.). As a consequence, applications can't test pbuf->type any more. Use pbuf_match_type(pbuf, type) instead. * socket API: according to the standard, SO_ERROR now only returns asynchronous errors. All other/normal/synchronous errors are (and always were) available via 'errno'. LWIP_SOCKET_SET_ERRNO has been removed - 'errno' is always set - and required! * compatibility headers: moved from 'src/include/posix' to 'src/include/compat/posix', 'src/include/compat/stdc' etc. * The IPv6 implementation now supports address scopes. All addresses that have a scope according to the default policy (link-local unicast addresses, interface-local and link-local multicast addresses) should now have a zone set on them before being passed to the core API, although lwIP will currently attempt to select a zone on the caller's behalf when necessary. Applications that directly assign IPv6 addresses to interfaces (which is NOT recommended) must now ensure that link-local addresses carry the netif's zone. See the new ip6_zone.h header file for more information and relevant macros. For now it is still possible to turn off scopes support through the new LWIP_IPV6_SCOPES option. When upgrading an implementation that uses the core API directly, it is highly recommended to enable LWIP_IPV6_SCOPES_DEBUG at least for a while, to ensure e.g. proper address initialization. * LWIP_HOOK_DHCP_APPEND_OPTIONS() has changed, see description in opt.h (options_out_len is not available in struct dhcp any more) (2.0.2) ++ Application changes: * slipif: The way to pass serial port number has changed. netif->num is not supported any more, netif->state is interpreted as an u8_t port number now (it's not a POINTER to an u8_t any more!) (2.0.1) ++ Application changes: * UDP does NOT receive multicast traffic from ALL netifs on an UDP PCB bound to a specific netif any more. Users need to bind to IP_ADDR_ANY to receive multicast traffic and compare ip_current_netif() to the desired netif for every packet. See bug #49662 for an explanation. (2.0.0) ++ Application changes: * Changed netif "up" flag handling to be an administrative flag (as opposed to the previous meaning of "ip4-address-valid", a netif will now not be used for transmission if not up) -> even a DHCP netif has to be set "up" before starting the DHCP client * Added IPv6 support (dual-stack or IPv4/IPv6 only) * Changed ip_addr_t to be a union in dual-stack mode (use ip4_addr_t where referring to IPv4 only). * Major rewrite of SNMP (added MIB parser that creates code stubs for custom MIBs); supports SNMPv2c (experimental v3 support) * Moved some core applications from contrib repository to src/apps (and include/lwip/apps) +++ Raw API: * Changed TCP listen backlog: removed tcp_accepted(), added the function pair tcp_backlog_delayed()/ tcp_backlog_accepted() to explicitly delay backlog handling on a connection pcb +++ Socket API: * Added an implementation for posix sendmsg() * Added LWIP_FIONREAD_LINUXMODE that makes ioctl/FIONREAD return the size of the next pending datagram ++ Port changes +++ new files: * MANY new and moved files! * Added src/Filelists.mk for use in Makefile projects * Continued moving stack-internal parts from abc.h to abc_priv.h in sub-folder "priv" to let abc.h only contain the actual application programmer's API +++ sys layer: * Made LWIP_TCPIP_CORE_LOCKING==1 the default as it usually performs better than the traditional message passing (although with LWIP_COMPAT_MUTEX you are still open to priority inversion, so this is not recommended any more) * Added LWIP_NETCONN_SEM_PER_THREAD to use one "op_completed" semaphore per thread instead of using one per netconn (these semaphores are used even with core locking enabled as some longer lasting functions like big writes still need to delay) * Added generalized abstraction for itoa(), strnicmp(), stricmp() and strnstr() in def.h (to be overridden in cc.h) instead of config options for netbiosns, httpd, dns, etc. ... * New abstraction for hton* and ntoh* functions in def.h. To override them, use the following in cc.h: #define lwip_htons(x) #define lwip_htonl(x) +++ new options: * TODO +++ new pools: * Added LWIP_MEMPOOL_* (declare/init/alloc/free) to declare private memp pools that share memp.c code but do not have to be made global via lwippools.h * Added pools for IPv6, MPU_COMPATIBLE, dns-api, netif-api, etc. * added hook LWIP_HOOK_MEMP_AVAILABLE() to get informed when a memp pool was empty and an item is now available * Signature of LWIP_HOOK_VLAN_SET macro was changed * LWIP_DECLARE_MEMORY_ALIGNED() may be used to declare aligned memory buffers (mem/memp) or to move buffers to dedicated memory using compiler attributes * Standard C headers are used to define sized types and printf formatters (disable by setting LWIP_NO_STDINT_H=1 or LWIP_NO_INTTYPES_H=1 if your compiler does not support these) ++ Major bugfixes/improvements * Added IPv6 support (dual-stack or IPv4/IPv6 only) * Major rewrite of PPP (incl. keep-up with apache pppd) see doc/ppp.txt for an upgrading how-to * Major rewrite of SNMP (incl. MIB parser) * Fixed timing issues that might have lead to losing a DHCP lease * Made rx processing path more robust against crafted errors * TCP window scaling support * modification of api modules to support FreeRTOS-MPU (don't pass stack-pointers to other threads) * made DNS client more robust * support PBUF_REF for RX packets * LWIP_NETCONN_FULLDUPLEX allows netconn/sockets to be used for reading/writing from separate threads each (needs LWIP_NETCONN_SEM_PER_THREAD) * Moved and reordered stats (mainly memp/mib2) (1.4.0) ++ Application changes: * Replaced struct ip_addr by typedef ip_addr_t (struct ip_addr is kept for compatibility to old applications, but will be removed in the future). * Renamed mem_realloc() to mem_trim() to prevent confusion with realloc() +++ Raw API: * Changed the semantics of tcp_close() (since it was rather a shutdown before): Now the application does *NOT* get any calls to the recv callback (aside from NULL/closed) after calling tcp_close() * When calling tcp_abort() from a raw API TCP callback function, make sure you return ERR_ABRT to prevent accessing unallocated memory. (ERR_ABRT now means the applicaiton has called tcp_abort!) +++ Netconn API: * Changed netconn_receive() and netconn_accept() to return err_t, not a pointer to new data/netconn. +++ Socket API: * LWIP_SO_RCVTIMEO: when accept() or recv() time out, they now set errno to EWOULDBLOCK/EAGAIN, not ETIMEDOUT. * Added a minimal version of posix fctl() to have a standardised way to set O_NONBLOCK for nonblocking sockets. +++ all APIs: * correctly implemented SO(F)_REUSEADDR ++ Port changes +++ new files: * Added 4 new files: def.c, timers.c, timers.h, tcp_impl.h: * Moved stack-internal parts of tcp.h to tcp_impl.h, tcp.h now only contains the actual application programmer's API * Separated timer implementation from sys.h/.c, moved to timers.h/.c; Added timer implementation for NO_SYS==1, set NO_SYS_NO_TIMERS==1 if you still want to use your own timer implementation for NO_SYS==0 (as before). +++ sys layer: * Converted mbox- and semaphore-functions to take pointers to sys_mbox_t/ sys_sem_t; * Converted sys_mbox_new/sys_sem_new to take pointers and return err_t; * Added Mutex concept in sys_arch (define LWIP_COMPAT_MUTEX to let sys.h use binary semaphores instead of mutexes - as before) +++ new options: * Don't waste memory when chaining segments, added option TCP_OVERSIZE to prevent creating many small pbufs when calling tcp_write with many small blocks of data. Instead, pbufs are allocated larger than needed and the space is used for later calls to tcp_write. * Added LWIP_NETIF_TX_SINGLE_PBUF to always copy to try to create single pbufs in tcp_write/udp_send. * Added an additional option LWIP_ETHERNET to support ethernet without ARP (necessary for pure PPPoE) * Add MEMP_SEPARATE_POOLS to place memory pools in separate arrays. This may be used to place these pools into user-defined memory by using external declaration. * Added TCP_SNDQUEUELOWAT corresponding to TCP_SNDLOWAT +++ new pools: * Netdb uses a memp pool for allocating memory when getaddrinfo() is called, so MEMP_NUM_NETDB has to be set accordingly. * DNS_LOCAL_HOSTLIST_IS_DYNAMIC uses a memp pool instead of the heap, so MEMP_NUM_LOCALHOSTLIST has to be set accordingly. * Snmp-agent uses a memp pools instead of the heap, so MEMP_NUM_SNMP_* have to be set accordingly. * PPPoE uses a MEMP pool instead of the heap, so MEMP_NUM_PPPOE_INTERFACES has to be set accordingly * Integrated loopif into netif.c - loopif does not have to be created by the port any more, just define LWIP_HAVE_LOOPIF to 1. * Added define LWIP_RAND() for lwip-wide randomization (needs to be defined in cc.h, e.g. used by igmp) * Added printf-formatter X8_F to printf u8_t as hex * The heap now may be moved to user-defined memory by defining LWIP_RAM_HEAP_POINTER as a void pointer to that memory's address * added autoip_set_struct() and dhcp_set_struct() to let autoip and dhcp work with user-allocated structs instead of calling mem_malloc * Added const char* name to mem- and memp-stats for easier debugging. * Calculate the TCP/UDP checksum while copying to only fetch data once: Define LWIP_CHKSUM_COPY to a memcpy-like function that returns the checksum * Added SO_REUSE_RXTOALL to pass received UDP broadcast/multicast packets to more than one pcb. * Changed the semantics of ARP_QUEUEING==0: ARP_QUEUEING now cannot be turned off any more, if this is set to 0, only one packet (the most recent one) is queued (like demanded by RFC 1122). ++ Major bugfixes/improvements * Implemented tcp_shutdown() to only shut down one end of a connection * Implemented shutdown() at socket- and netconn-level * Added errorset support to select() + improved select speed overhead * Merged pppd to v2.3.11 (including some backported bugfixes from 2.4.x) * Added timer implementation for NO_SYS==1 (may be disabled with NO_SYS_NO_TIMERS==1 * Use macros defined in ip_addr.h to work with IP addresses * Implemented many nonblocking socket/netconn functions * Fixed ARP input processing: only add a new entry if a request was directed as us * mem_realloc() to mem_trim() to prevent confusion with realloc() * Some improvements for AutoIP (don't route/forward link-local addresses, don't break existing connections when assigning a routable address) * Correctly handle remote side overrunning our rcv_wnd in ooseq case * Removed packing from ip_addr_t, the packed version is now only used in protocol headers * Corrected PBUF_POOL_BUFSIZE for ports where ETH_PAD_SIZE > 0 * Added support for static ARP table entries (STABLE-1.3.2) * initial version of this file