Mercurial > ecos
changeset 2162:02b2b5ad1fef
* tests/nc_test_slave.c (nc_slave): Fix some of the compiler
warnings.
* cdl/lwip_net.cdl Changed default value of
CYGNUM_LWIP_MEMP_NUM_SYS_TIMEOUT (required for DHCP).
Replaced CYGPKG_LWIP_DHCP_OPTIONS with CYGPKG_LWIP_DHCP
and add CYGOPT_LWIP_DHCP_MANAGEMENT for automatic DHCP
management.
* include/lwip/ip_addr.h Add macro ip_addr_netcmp()
(copied from lwIP CVS).
* include/netif/etharp.h Updated file to version of
lwIP CVS.
* src/ecos/init.c Add include <pkgconf/net_lwip.h>
Add lwip_dhcp_fine_tmr() and lwip_dhcp_coarse_tmr()
for DHCP processing.
Change tcpip_init_done() to start DHCP timers and
ARP timer.
Changed lwip_set_addr() to properly setup IP adress
if DHCP is used.
Added lwip_dhcp_init() for start of DHCP client.
Removed start of ARP timer from ecosclue_init().
* src/netif/etharp.c Updated file to version of
lwIP CVS.
line wrap: on
line diff
--- a/packages/net/lwip_tcpip/current/ChangeLog +++ b/packages/net/lwip_tcpip/current/ChangeLog @@ -1,3 +1,31 @@ +2006-03-15 Andrew Lunn <andrew.lunn@ascom.ch> + + * tests/nc_test_slave.c (nc_slave): Fix some of the compiler + warnings. + +2006-03-13 Uwe Kindler <uwe_kindler@web.de> + + * cdl/lwip_net.cdl Changed default value of + CYGNUM_LWIP_MEMP_NUM_SYS_TIMEOUT (required for DHCP). + Replaced CYGPKG_LWIP_DHCP_OPTIONS with CYGPKG_LWIP_DHCP + and add CYGOPT_LWIP_DHCP_MANAGEMENT for automatic DHCP + management. + * include/lwip/ip_addr.h Add macro ip_addr_netcmp() + (copied from lwIP CVS). + * include/netif/etharp.h Updated file to version of + lwIP CVS. + * src/ecos/init.c Add include <pkgconf/net_lwip.h> + Add lwip_dhcp_fine_tmr() and lwip_dhcp_coarse_tmr() + for DHCP processing. + Change tcpip_init_done() to start DHCP timers and + ARP timer. + Changed lwip_set_addr() to properly setup IP adress + if DHCP is used. + Added lwip_dhcp_init() for start of DHCP client. + Removed start of ARP timer from ecosclue_init(). + * src/netif/etharp.c Updated file to version of + lwIP CVS. + 2006-03-02 Andrew Lunn <andrew.lunn@ascom.ch> * cdl/lwip_net.cdl: Add the interfaces CYGPKG_NET_STACK,
--- a/packages/net/lwip_tcpip/current/cdl/lwip_net.cdl +++ b/packages/net/lwip_tcpip/current/cdl/lwip_net.cdl @@ -169,7 +169,7 @@ cdl_package CYGPKG_NET_LWIP { no_define description " Tunables for various aspects of memory usage throughout the stack." - + cdl_option CYGNUM_LWIP_MEM_ALIGNMENT { display "Memory alignment" flavor data @@ -185,7 +185,7 @@ cdl_package CYGPKG_NET_LWIP { default_value 4000 description " MEM_SIZE: the size of the heap memory. If the application will send - a lot of data that needs to be copied, this should be set high." + a lot of data that needs to be copied, this should be set high." } cdl_option CYGNUM_LWIP_MEMP_NUM_PBUF { @@ -237,7 +237,7 @@ cdl_package CYGPKG_NET_LWIP { cdl_option CYGNUM_LWIP_MEMP_NUM_SYS_TIMEOUT { display "Simultaneous active timeouts" flavor data - default_value 3 + default_value CYGPKG_LWIP_DHCP ? 6 : 4 description " MEMP_NUM_SYS_TIMEOUT: the number of simulateously active timeouts." @@ -249,7 +249,7 @@ cdl_package CYGPKG_NET_LWIP { no_define description " The following four are used only with the sequential API and can be - set to 0 if the application only will use the raw API." + set to 0 if the application only will use the raw API." cdl_option CYGNUM_LWIP_MEMP_NUM_NETBUF { @@ -315,7 +315,7 @@ cdl_package CYGPKG_NET_LWIP { default_value 1024 description " PBUF_POOL_BUFSIZE: the size of each pbuf in the pbuf pool." - } + } cdl_option CYGNUM_LWIP_PBUF_LINK_HLEN { display "Allocation for a link level header" @@ -332,7 +332,7 @@ cdl_package CYGPKG_NET_LWIP { flavor none no_define description " - Tune the TCP protocol details" + Tune the TCP protocol details" cdl_option CYGFUN_LWIP_TCP { display "Activate TCP" @@ -372,7 +372,7 @@ cdl_package CYGPKG_NET_LWIP { default_value 2048 description " TCP Maximum segment size." - } + } cdl_option CYGNUM_LWIP_TCP_SND_BUF { display "Sender buffer space" @@ -486,27 +486,32 @@ cdl_package CYGPKG_NET_LWIP { } } - cdl_component CYGPKG_LWIP_DHCP_OPTIONS { - display "DHCP" - flavor none - no_define - + cdl_component CYGPKG_LWIP_DHCP { + display "Use DHCP" + flavor bool + default_value 0 + requires { CYGNUM_LWIP_MEMP_NUM_SYS_TIMEOUT >= 6 } + description " + Provide DHCP for initializing the IP address of network interfaces." + compile core/dhcp.c - cdl_option CYGFUN_LWIP_DHCP { - display "Activate DHCP" - flavor bool - default_value 0 - description " - Enable this option if you want DHCP configuration of - interfaces." - compile core/dhcp.c - } - - + cdl_option CYGOPT_LWIP_DHCP_MANAGEMENT { + display "DHCP management" + flavor bool + default_value 1 + description " + If enabled then the lwIP stack automatically calls dhcp_start(), + dhcp_fine_tmr() and dhcp_coarse_tmr(). The DHCP stuff is handled + in the TCP/IP thread. If this causes trouble on high traffic loads + or if the application need to be aware of the DHCP state then it + is better to disable this option. In this case managing the DHCP + state in an application aware thread is recommended." + } + cdl_option CYGOPT_LWIP_DHCP_DOES_ARP_CHECK { display "Check offered address" flavor bool - default_value 0 + default_value 1 description " Enable this option if you want to do an ARP check on the offered address (recommended)." @@ -557,7 +562,7 @@ cdl_package CYGPKG_NET_LWIP { flavor data default_value {"\"/dev/ser0\""} description " - Which serial port to use SLIP on." + Which serial port to use SLIP on." } }
--- a/packages/net/lwip_tcpip/current/include/lwip/ip_addr.h +++ b/packages/net/lwip_tcpip/current/include/lwip/ip_addr.h @@ -142,6 +142,20 @@ u8_t ip_addr_isbroadcast(struct ip_addr #define ip4_addr2(ipaddr) ((unsigned int)(ntohl((ipaddr)->addr) >> 16) & 0xff) #define ip4_addr3(ipaddr) ((unsigned int)(ntohl((ipaddr)->addr) >> 8) & 0xff) #define ip4_addr4(ipaddr) ((unsigned int)(ntohl((ipaddr)->addr)) & 0xff) + +/** + * Determine if two address are on the same network. + * + * @arg addr1 IP address 1 + * @arg addr2 IP address 2 + * @arg mask network identifier mask + * @return !0 if the network identifiers of both address match + */ +#define ip_addr_netcmp(addr1, addr2, mask) (((addr1)->addr & \ + (mask)->addr) == \ + ((addr2)->addr & \ + (mask)->addr)) + #endif /* __LWIP_IP_ADDR_H__ */
--- a/packages/net/lwip_tcpip/current/include/lwipopts.h +++ b/packages/net/lwip_tcpip/current/include/lwipopts.h @@ -158,7 +158,7 @@ a lot of data that needs to be copied, t /* Define LWIP_DHCP to 1 if you want DHCP configuration of interfaces.*/ -#ifdef CYGFUN_LWIP_DHCP +#ifdef CYGPKG_LWIP_DHCP #define LWIP_DHCP 1 /* 1 if you want to do an ARP check on the offered address @@ -202,7 +202,7 @@ a lot of data that needs to be copied, t #else #define LWIP_HAVE_LOOPIF 0 #endif -/* ---------- PPP options --------- */ +/* ---------- PPP options --------- */ #ifdef CYGPKG_LWIP_PPP #define PPP_SUPPORT 1 #else
--- a/packages/net/lwip_tcpip/current/include/netif/etharp.h +++ b/packages/net/lwip_tcpip/current/include/netif/etharp.h @@ -35,8 +35,8 @@ #ifndef __NETIF_ETHARP_H__ #define __NETIF_ETHARP_H__ -#ifndef PAD_ETH_SIZE -#define PAD_ETH_SIZE 0 +#ifndef ETH_PAD_SIZE +#define ETH_PAD_SIZE 0 #endif #include "lwip/pbuf.h" @@ -52,18 +52,30 @@ struct eth_addr { PACK_STRUCT_FIELD(u8_t addr[6]); } PACK_STRUCT_STRUCT; PACK_STRUCT_END +#ifdef PACK_STRUCT_USE_INCLUDES +# include "arch/epstruct.h" +#endif +#ifdef PACK_STRUCT_USE_INCLUDES +# include "arch/bpstruct.h" +#endif PACK_STRUCT_BEGIN struct eth_hdr { -#if PAD_ETH_SIZE - PACK_STRUCT_FIELD(u8_t padding[PAD_ETH_SIZE]); +#if ETH_PAD_SIZE + PACK_STRUCT_FIELD(u8_t padding[ETH_PAD_SIZE]); #endif PACK_STRUCT_FIELD(struct eth_addr dest); PACK_STRUCT_FIELD(struct eth_addr src); PACK_STRUCT_FIELD(u16_t type); } PACK_STRUCT_STRUCT; PACK_STRUCT_END +#ifdef PACK_STRUCT_USE_INCLUDES +# include "arch/epstruct.h" +#endif +#ifdef PACK_STRUCT_USE_INCLUDES +# include "arch/bpstruct.h" +#endif PACK_STRUCT_BEGIN /** the ARP message */ struct etharp_hdr { @@ -78,30 +90,37 @@ struct etharp_hdr { PACK_STRUCT_FIELD(struct ip_addr2 dipaddr); } PACK_STRUCT_STRUCT; PACK_STRUCT_END +#ifdef PACK_STRUCT_USE_INCLUDES +# include "arch/epstruct.h" +#endif +#ifdef PACK_STRUCT_USE_INCLUDES +# include "arch/bpstruct.h" +#endif PACK_STRUCT_BEGIN struct ethip_hdr { PACK_STRUCT_FIELD(struct eth_hdr eth); PACK_STRUCT_FIELD(struct ip_hdr ip); -}; +} PACK_STRUCT_STRUCT; +PACK_STRUCT_END #ifdef PACK_STRUCT_USE_INCLUDES # include "arch/epstruct.h" #endif -#define ARP_TMR_INTERVAL 10000 +/** 5 seconds period */ +#define ARP_TMR_INTERVAL 5000 #define ETHTYPE_ARP 0x0806 #define ETHTYPE_IP 0x0800 void etharp_init(void); void etharp_tmr(void); -struct pbuf *etharp_ip_input(struct netif *netif, struct pbuf *p); -struct pbuf *etharp_arp_input(struct netif *netif, struct eth_addr *ethaddr, +void etharp_ip_input(struct netif *netif, struct pbuf *p); +void etharp_arp_input(struct netif *netif, struct eth_addr *ethaddr, struct pbuf *p); -struct pbuf *etharp_output(struct netif *netif, struct ip_addr *ipaddr, +err_t etharp_output(struct netif *netif, struct ip_addr *ipaddr, struct pbuf *q); err_t etharp_query(struct netif *netif, struct ip_addr *ipaddr, struct pbuf *q); - - +err_t etharp_request(struct netif *netif, struct ip_addr *ipaddr); #endif /* __NETIF_ARP_H__ */
--- a/packages/net/lwip_tcpip/current/src/api/sockets.c +++ b/packages/net/lwip_tcpip/current/src/api/sockets.c @@ -499,7 +499,7 @@ lwip_send(int s, void *data, int size, u /* deallocated the buffer */ netbuf_delete(buf); } - break; + break; #endif #if LWIP_TCP case NETCONN_TCP:
--- a/packages/net/lwip_tcpip/current/src/ecos/init.c +++ b/packages/net/lwip_tcpip/current/src/ecos/init.c @@ -34,6 +34,7 @@ * init.c - misc lwip ecos glue functions */ #include <pkgconf/system.h> +#include <pkgconf/net_lwip.h> #include "lwip/opt.h" #include "lwip/sys.h" #include "lwip/memp.h" @@ -75,12 +76,6 @@ void inline IP_ADDR(struct ip_addr *ipad } -void tcpip_init_done(void * arg) -{ - sys_sem_t *sem = arg; - sys_sem_signal(*sem); -} - struct netif mynetif, loopif; void lwip_set_addr(struct netif *netif); #if PPP_SUPPORT @@ -116,6 +111,48 @@ ppp_trace(int level, const char *format, struct netif ecos_loopif; #endif + +static void +arp_timer(void *arg) +{ + etharp_tmr(); + sys_timeout(ARP_TMR_INTERVAL, (sys_timeout_handler) arp_timer, NULL); +} + +#if LWIP_DHCP +static void lwip_dhcp_fine_tmr(void *arg) +{ + dhcp_fine_tmr(); + sys_timeout(500, (sys_timeout_handler) lwip_dhcp_fine_tmr, NULL); +} + +static void lwip_dhcp_coarse_tmr(void *arg) +{ + dhcp_coarse_tmr(); + sys_timeout(60000, (sys_timeout_handler) lwip_dhcp_coarse_tmr, NULL); +} +#endif + + +// +// This function is called when tcpip thread finished initialisation. +// We start several timers here - these timers are all handled in the +// tcpip thread. That means that also the DHCP stuff is handled in the +// TCPIP thread. If this causes any trouble than it may be necessaray to +// use an own DHCP thread insted. +// +void tcpip_init_done(void * arg) +{ + sys_timeout(ARP_TMR_INTERVAL, (sys_timeout_handler) arp_timer, NULL); +#ifdef CYGOPT_LWIP_DHCP_MANAGEMENT + sys_timeout(500, (sys_timeout_handler) lwip_dhcp_fine_tmr, NULL); + sys_timeout(60000, (sys_timeout_handler) lwip_dhcp_coarse_tmr, NULL); +#endif + sys_sem_t *sem = arg; + sys_sem_signal(*sem); +} + + /* * Called by the eCos application at startup * wraps various init calls @@ -169,22 +206,43 @@ lwip_init(void) return 0; } + +err_t lwip_dummy_netif_init(struct netif *netif) +{ + return ERR_OK; +} + + void lwip_set_addr(struct netif *netif) { struct ip_addr ipaddr, netmask, gw; + +#if LWIP_DHCP + IP4_ADDR(&gw, 0,0,0,0); + IP4_ADDR(&ipaddr, 0,0,0,0); + IP4_ADDR(&netmask, 0,0,0,0); + netif_add(netif, &ipaddr, &netmask, &gw, netif->state, lwip_dummy_netif_init, tcpip_input); + netif_set_default(netif); +#else IP_ADDR(&gw, CYGDAT_LWIP_SERV_ADDR); IP_ADDR(&ipaddr, CYGDAT_LWIP_MY_ADDR); IP_ADDR(&netmask, CYGDAT_LWIP_NETMASK); - netif_set_addr(netif, &ipaddr, &netmask, &gw); - netif->next = netif_list; - netif_list = netif; - - netif->input = tcpip_input; - //netif->input = ip_input; + + netif_add(netif, &ipaddr, &netmask, &gw, netif->state, lwip_dummy_netif_init, tcpip_input); + netif_set_default(netif); +#endif } +void lwip_dhcp_init(struct netif *netif) +{ +#ifdef CYGOPT_LWIP_DHCP_MANAGEMENT + dhcp_start(netif); +#endif +} + + #ifdef CYGPKG_LWIP_ETH //io eth stuff @@ -224,6 +282,7 @@ input_thread(void *arg) } + // Initialize all network devices static void init_hw_drivers(void) @@ -240,22 +299,15 @@ init_hw_drivers(void) } } -static void -arp_timer(void *arg) -{ - etharp_tmr(); - sys_timeout(ARP_TMR_INTERVAL, (sys_timeout_handler) arp_timer, NULL); -} - +extern struct netif *netif_default; static void ecosglue_init(void) { - cyg_semaphore_init(&delivery, 0); - init_hw_drivers(); - sys_thread_new(input_thread, (void*)0, CYGNUM_LWIP_ETH_THREAD_PRIORITY); - etharp_init(); - sys_timeout(ARP_TMR_INTERVAL, (sys_timeout_handler) arp_timer, NULL); + etharp_init(); + cyg_semaphore_init(&delivery, 0); + init_hw_drivers(); + sys_thread_new(input_thread, (void*)0, CYGNUM_LWIP_ETH_THREAD_PRIORITY); } #endif //CYGPKG_LWIP_ETH
--- a/packages/net/lwip_tcpip/current/src/netif/etharp.c +++ b/packages/net/lwip_tcpip/current/src/netif/etharp.c @@ -6,8 +6,10 @@ * to a physical address when sending a packet, and the second part answers * requests from other machines for our physical address. * - * This implementation complies with RFC 826 (Ethernet ARP) and supports - * Gratuitious ARP from RFC3220 (IP Mobility Support for IPv4) section 4.6. + * This implementation complies with RFC 826 (Ethernet ARP). It supports + * Gratuitious ARP from RFC3220 (IP Mobility Support for IPv4) section 4.6 + * if an interface calls etharp_query(our_netif, its_ip_addr, NULL) upon + * address change. */ /* @@ -37,52 +39,11 @@ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY * OF SUCH DAMAGE. - * + * * This file is part of the lwIP TCP/IP stack. * - * Author: Adam Dunkels <adam@sics.se> - * */ -/** - * TODO: - * - pbufs should be sent from the queue once an ARP entry state - * goes from PENDING to STABLE. - * - Non-PENDING entries MUST NOT have queued packets. - */ - -/* - * TODO: - * -RFC 3220 4.6 IP Mobility Support for IPv4 January 2002 - - - A Gratuitous ARP [45] is an ARP packet sent by a node in order - to spontaneously cause other nodes to update an entry in their - ARP cache. A gratuitous ARP MAY use either an ARP Request or - an ARP Reply packet. In either case, the ARP Sender Protocol - Address and ARP Target Protocol Address are both set to the IP - address of the cache entry to be updated, and the ARP Sender - Hardware Address is set to the link-layer address to which this - cache entry should be updated. When using an ARP Reply packet, - the Target Hardware Address is also set to the link-layer - address to which this cache entry should be updated (this field - is not used in an ARP Request packet). - - In either case, for a gratuitous ARP, the ARP packet MUST be - transmitted as a local broadcast packet on the local link. As - specified in [36], any node receiving any ARP packet (Request - or Reply) MUST update its local ARP cache with the Sender - Protocol and Hardware Addresses in the ARP packet, if the - receiving node has an entry for that IP address already in its - ARP cache. This requirement in the ARP protocol applies even - for ARP Request packets, and for ARP Reply packets that do not - match any ARP Request transmitted by the receiving node [36]. -* - My suggestion would be to send a ARP request for our newly obtained - address upon configuration of an Ethernet interface. - -*/ - #include "lwip/opt.h" #include "lwip/inet.h" #include "netif/etharp.h" @@ -94,13 +55,17 @@ RFC 3220 4.6 IP Mobility Suppor # include "lwip/dhcp.h" #endif -/* allows new queueing code to be disabled (0) for regression testing */ -#define ARP_NEW_QUEUE 1 - -/** the time an ARP entry stays valid after its last update, (120 * 10) seconds = 20 minutes. */ -#define ARP_MAXAGE 120 -/** the time an ARP entry stays pending after first request, (1 * 10) seconds = 10 seconds. */ -#define ARP_MAXPENDING 1 +/** the time an ARP entry stays valid after its last update, + * (240 * 5) seconds = 20 minutes. + */ +#define ARP_MAXAGE 240 +/** the time an ARP entry stays pending after first request, + * (2 * 5) seconds = 10 seconds. + * + * @internal Keep this number at least 2, otherwise it might + * run out instantly if the timeout occurs directly after a request. + */ +#define ARP_MAXPENDING 2 #define HWTYPE_ETHERNET 1 @@ -118,37 +83,40 @@ enum etharp_state { ETHARP_STATE_EMPTY, ETHARP_STATE_PENDING, ETHARP_STATE_STABLE, - /** @internal convenience transitional state used in etharp_tmr() */ + /** @internal transitional state used in etharp_tmr() for convenience*/ ETHARP_STATE_EXPIRED }; struct etharp_entry { +#if ARP_QUEUEING + /** + * Pointer to queue of pending outgoing packets on this ARP entry. + */ + struct pbuf *p; +#endif struct ip_addr ipaddr; struct eth_addr ethaddr; enum etharp_state state; -#if ARP_QUEUEING - /** - * Pointer to queue of pending outgoing packets on this ARP entry. - * Must be at most a single packet for now. */ - struct pbuf *p; -#endif u8_t ctime; }; static const struct eth_addr ethbroadcast = {{0xff,0xff,0xff,0xff,0xff,0xff}}; static struct etharp_entry arp_table[ARP_TABLE_SIZE]; -static s8_t find_arp_entry(void); -/** ask update_arp_entry() to add instead of merely update an ARP entry */ -#define ARP_INSERT_FLAG 1 -static struct pbuf *update_arp_entry(struct netif *netif, struct ip_addr *ipaddr, struct eth_addr *ethaddr, u8_t flags); +/** + * Try hard to create a new entry - we want the IP address to appear in + * the cache (even if this means removing an active entry or so). */ +#define ETHARP_TRY_HARD 1 + +static s8_t find_entry(struct ip_addr *ipaddr, u8_t flags); +static err_t update_arp_entry(struct netif *netif, struct ip_addr *ipaddr, struct eth_addr *ethaddr, u8_t flags); /** * Initializes ARP module. */ void etharp_init(void) { - s8_t i; + u8_t i; /* clear ARP entries */ for(i = 0; i < ARP_TABLE_SIZE; ++i) { arp_table[i].state = ETHARP_STATE_EMPTY; @@ -162,30 +130,35 @@ etharp_init(void) /** * Clears expired entries in the ARP table. * - * This function should be called every ETHARP_TMR_INTERVAL microseconds (10 seconds), + * This function should be called every ETHARP_TMR_INTERVAL microseconds (5 seconds), * in order to expire entries in the ARP table. */ void etharp_tmr(void) { - s8_t i; + u8_t i; LWIP_DEBUGF(ETHARP_DEBUG, ("etharp_timer\n")); /* remove expired entries from the ARP table */ for (i = 0; i < ARP_TABLE_SIZE; ++i) { arp_table[i].ctime++; - /* a resolved/stable entry? */ + /* stable entry? */ if ((arp_table[i].state == ETHARP_STATE_STABLE) && /* entry has become old? */ (arp_table[i].ctime >= ARP_MAXAGE)) { - LWIP_DEBUGF(ETHARP_DEBUG, ("etharp_timer: expired stable entry %u.\n", i)); + LWIP_DEBUGF(ETHARP_DEBUG, ("etharp_timer: expired stable entry %"U16_F".\n", (u16_t)i)); arp_table[i].state = ETHARP_STATE_EXPIRED; - /* an unresolved/pending entry? */ - } else if ((arp_table[i].state == ETHARP_STATE_PENDING) && - /* entry unresolved/pending for too long? */ - (arp_table[i].ctime >= ARP_MAXPENDING)) { - LWIP_DEBUGF(ETHARP_DEBUG, ("etharp_timer: expired pending entry %u.\n", i)); - arp_table[i].state = ETHARP_STATE_EXPIRED; + /* pending entry? */ + } else if (arp_table[i].state == ETHARP_STATE_PENDING) { + /* entry unresolved/pending for too long? */ + if (arp_table[i].ctime >= ARP_MAXPENDING) { + LWIP_DEBUGF(ETHARP_DEBUG, ("etharp_timer: expired pending entry %"U16_F".\n", (u16_t)i)); + arp_table[i].state = ETHARP_STATE_EXPIRED; +#if ARP_QUEUEING + } else if (arp_table[i].p != NULL) { + /* resend an ARP query here */ +#endif + } } /* clean up entries that have just been expired */ if (arp_table[i].state == ETHARP_STATE_EXPIRED) { @@ -193,7 +166,7 @@ etharp_tmr(void) /* and empty packet queue */ if (arp_table[i].p != NULL) { /* remove all queued packets */ - LWIP_DEBUGF(ETHARP_DEBUG, ("etharp_timer: freeing entry %u, packet queue %p.\n", i, (void *)(arp_table[i].p))); + LWIP_DEBUGF(ETHARP_DEBUG, ("etharp_timer: freeing entry %"U16_F", packet queue %p.\n", (u16_t)i, (void *)(arp_table[i].p))); pbuf_free(arp_table[i].p); arp_table[i].p = NULL; } @@ -205,59 +178,161 @@ etharp_tmr(void) } /** - * Return an empty ARP entry (possibly recycling the oldest stable entry). + * Search the ARP table for a matching or new entry. + * + * If an IP address is given, return a pending or stable ARP entry that matches + * the address. If no match is found, create a new entry with this address set, + * but in state ETHARP_EMPTY. The caller must check and possibly change the + * state of the returned entry. + * + * If ipaddr is NULL, return a initialized new entry in state ETHARP_EMPTY. + * + * In all cases, attempt to create new entries from an empty entry. If no + * empty entries are available and ETHARP_TRY_HARD flag is set, recycle + * old entries. Heuristic choose the least important entry for recycling. * - * @return The ARP entry index that is available, ERR_MEM if no usable - * entry is found. + * @param ipaddr IP address to find in ARP cache, or to add if not found. + * @param flags + * - ETHARP_TRY_HARD: Try hard to create a entry by allowing recycling of + * active (stable or pending) entries. + * + * @return The ARP entry index that matched or is created, ERR_MEM if no + * entry is found or could be recycled. */ -static s8_t -find_arp_entry(void) +static s8_t find_entry(struct ip_addr *ipaddr, u8_t flags) { - s8_t i, j; - u8_t maxtime = 0; + s8_t old_pending = ARP_TABLE_SIZE, old_stable = ARP_TABLE_SIZE; + s8_t empty = ARP_TABLE_SIZE; + u8_t i = 0, age_pending = 0, age_stable = 0; +#if ARP_QUEUEING + /* oldest entry with packets on queue */ + s8_t old_queue = ARP_TABLE_SIZE; + /* its age */ + u8_t age_queue = 0; +#endif + + /** + * a) do a search through the cache, remember candidates + * b) select candidate entry + * c) create new entry + */ - j = ARP_TABLE_SIZE; - /* search ARP table for an unused or old entry */ + /* a) in a single search sweep, do all of this + * 1) remember the first empty entry (if any) + * 2) remember the oldest stable entry (if any) + * 3) remember the oldest pending entry without queued packets (if any) + * 4) remember the oldest pending entry with queued packets (if any) + * 5) search for a matching IP entry, either pending or stable + * until 5 matches, or all entries are searched for. + */ + for (i = 0; i < ARP_TABLE_SIZE; ++i) { - /* empty entry? */ - if (arp_table[i].state == ETHARP_STATE_EMPTY) { - LWIP_DEBUGF(ETHARP_DEBUG, ("find_arp_entry: returning empty entry %u\n", i)); - return i; - /* stable entry? */ - } else if (arp_table[i].state == ETHARP_STATE_STABLE) { - /* remember entry with oldest stable entry in j */ - if (arp_table[i].ctime >= maxtime) maxtime = arp_table[j = i].ctime; + /* no empty entry found yet and now we do find one? */ + if ((empty == ARP_TABLE_SIZE) && (arp_table[i].state == ETHARP_STATE_EMPTY)) { + LWIP_DEBUGF(ETHARP_DEBUG, ("find_entry: found empty entry %"U16_F"\n", (u16_t)i)); + /* remember first empty entry */ + empty = i; + } + /* pending entry? */ + else if (arp_table[i].state == ETHARP_STATE_PENDING) { + /* if given, does IP address match IP address in ARP entry? */ + if (ipaddr && ip_addr_cmp(ipaddr, &arp_table[i].ipaddr)) { + LWIP_DEBUGF(ETHARP_DEBUG | DBG_TRACE, ("find_entry: found matching pending entry %"U16_F"\n", (u16_t)i)); + /* found exact IP address match, simply bail out */ + return i; +#if ARP_QUEUEING + /* pending with queued packets? */ + } else if (arp_table[i].p != NULL) { + if (arp_table[i].ctime >= age_queue) { + old_queue = i; + age_queue = arp_table[i].ctime; + } +#endif + /* pending without queued packets? */ + } else { + if (arp_table[i].ctime >= age_pending) { + old_pending = i; + age_pending = arp_table[i].ctime; + } + } + } + /* stable entry? */ + else if (arp_table[i].state == ETHARP_STATE_STABLE) { + /* if given, does IP address match IP address in ARP entry? */ + if (ipaddr && ip_addr_cmp(ipaddr, &arp_table[i].ipaddr)) { + LWIP_DEBUGF(ETHARP_DEBUG | DBG_TRACE, ("find_entry: found matching stable entry %"U16_F"\n", (u16_t)i)); + /* found exact IP address match, simply bail out */ + return i; + /* remember entry with oldest stable entry in oldest, its age in maxtime */ + } else if (arp_table[i].ctime >= age_stable) { + old_stable = i; + age_stable = arp_table[i].ctime; + } } } - /* no empty entry found? */ - if (i == ARP_TABLE_SIZE) { - LWIP_DEBUGF(ETHARP_DEBUG, ("find_arp_entry: found oldest stable entry %u\n", j)); - /* fall-back to oldest stable */ - i = j; + /* { we have no match } => try to create a new entry */ + + /* no empty entry found and not allowed to recycle? */ + if ((empty == ARP_TABLE_SIZE) && ((flags & ETHARP_TRY_HARD) == 0)) + { + return (s8_t)ERR_MEM; + } + + /* b) choose the least destructive entry to recycle: + * 1) empty entry + * 2) oldest stable entry + * 3) oldest pending entry without queued packets + * 4) oldest pending entry without queued packets + * + * { ETHARP_TRY_HARD is set at this point } + */ + + /* 1) empty entry available? */ + if (empty < ARP_TABLE_SIZE) { + i = empty; + LWIP_DEBUGF(ETHARP_DEBUG | DBG_TRACE, ("find_entry: selecting empty entry %"U16_F"\n", (u16_t)i)); } - /* no available entry found? */ - if (i == ARP_TABLE_SIZE) { - LWIP_DEBUGF(ETHARP_DEBUG, ("find_arp_entry: no replacable entry could be found\n")); - /* return failure */ - return ERR_MEM; + /* 2) found recyclable stable entry? */ + else if (old_stable < ARP_TABLE_SIZE) { + /* recycle oldest stable*/ + i = old_stable; + LWIP_DEBUGF(ETHARP_DEBUG | DBG_TRACE, ("find_entry: selecting oldest stable entry %"U16_F"\n", (u16_t)i)); +#if ARP_QUEUEING + /* no queued packets should exist on stable entries */ + LWIP_ASSERT("arp_table[i].p == NULL", arp_table[i].p == NULL); +#endif + /* 3) found recyclable pending entry without queued packets? */ + } else if (old_pending < ARP_TABLE_SIZE) { + /* recycle oldest pending */ + i = old_pending; + LWIP_DEBUGF(ETHARP_DEBUG | DBG_TRACE, ("find_entry: selecting oldest pending entry %"U16_F" (without queue)\n", (u16_t)i)); +#if ARP_QUEUEING + /* 4) found recyclable pending entry with queued packets? */ + } else if (old_queue < ARP_TABLE_SIZE) { + /* recycle oldest pending */ + i = old_queue; + LWIP_DEBUGF(ETHARP_DEBUG | DBG_TRACE, ("find_entry: selecting oldest pending entry %"U16_F", freeing packet queue %p\n", (u16_t)i, (void *)(arp_table[i].p))); + pbuf_free(arp_table[i].p); + arp_table[i].p = NULL; +#endif + /* no empty or recyclable entries found */ + } else { + return (s8_t)ERR_MEM; } - /* clean up the recycled stable entry */ - if (arp_table[i].state == ETHARP_STATE_STABLE) { -#if ARP_QUEUEING - /* and empty the packet queue */ - if (arp_table[i].p != NULL) { - /* remove all queued packets */ - LWIP_DEBUGF(ETHARP_DEBUG, ("find_arp_entry: freeing entry %u, packet queue %p.\n", i, (void *)(arp_table[i].p))); - pbuf_free(arp_table[i].p); - arp_table[i].p = NULL; - } -#endif - LWIP_DEBUGF(ETHARP_DEBUG | DBG_TRACE, ("find_arp_entry: recycling oldest stable entry %u\n", i)); - arp_table[i].state = ETHARP_STATE_EMPTY; + /* { empty or recyclable entry found } */ + LWIP_ASSERT("i < ARP_TABLE_SIZE", i < ARP_TABLE_SIZE); + + /* recycle entry (no-op for an already empty entry) */ + arp_table[i].state = ETHARP_STATE_EMPTY; + + /* IP address given? */ + if (ipaddr != NULL) { + /* set IP address */ + ip_addr_set(&arp_table[i].ipaddr, ipaddr); } - LWIP_DEBUGF(ETHARP_DEBUG, ("find_arp_entry: returning %u\n", i)); - return i; + arp_table[i].ctime = 0; + return (err_t)i; } /** @@ -269,118 +344,72 @@ find_arp_entry(void) * @param ipaddr IP address of the inserted ARP entry. * @param ethaddr Ethernet address of the inserted ARP entry. * @param flags Defines behaviour: - * - ARP_INSERT_FLAG Allows ARP to insert this as a new item. If not specified, + * - ETHARP_TRY_HARD Allows ARP to insert this as a new item. If not specified, * only existing ARP entries will be updated. * - * @return pbuf If non-NULL, a packet that was queued on a pending entry. - * You should sent it and must call pbuf_free() afterwards. + * @return + * - ERR_OK Succesfully updated ARP cache. + * - ERR_MEM If we could not add a new ARP entry when ETHARP_TRY_HARD was set. + * - ERR_ARG Non-unicast address given, those will not appear in ARP cache. * * @see pbuf_free() */ -static struct pbuf * +static err_t update_arp_entry(struct netif *netif, struct ip_addr *ipaddr, struct eth_addr *ethaddr, u8_t flags) { s8_t i, k; LWIP_DEBUGF(ETHARP_DEBUG | DBG_TRACE | 3, ("update_arp_entry()\n")); LWIP_ASSERT("netif->hwaddr_len != 0", netif->hwaddr_len != 0); - LWIP_DEBUGF(ETHARP_DEBUG | DBG_TRACE, ("update_arp_entry: %u.%u.%u.%u - %02x:%02x:%02x:%02x:%02x:%02x\n", + LWIP_DEBUGF(ETHARP_DEBUG | DBG_TRACE, ("update_arp_entry: %"U16_F".%"U16_F".%"U16_F".%"U16_F" - %02"X16_F":%02"X16_F":%02"X16_F":%02"X16_F":%02"X16_F":%02"X16_F"\n", ip4_addr1(ipaddr), ip4_addr2(ipaddr), ip4_addr3(ipaddr), ip4_addr4(ipaddr), ethaddr->addr[0], ethaddr->addr[1], ethaddr->addr[2], ethaddr->addr[3], ethaddr->addr[4], ethaddr->addr[5])); - /* do not update for 0.0.0.0 addresses */ - if (ipaddr->addr == 0) { - LWIP_DEBUGF(ETHARP_DEBUG | DBG_TRACE, ("update_arp_entry: will not add 0.0.0.0 to ARP cache\n")); - return NULL; + /* non-unicast address? */ + if (ip_addr_isany(ipaddr) || + ip_addr_isbroadcast(ipaddr, netif) || + ip_addr_ismulticast(ipaddr)) { + LWIP_DEBUGF(ETHARP_DEBUG | DBG_TRACE, ("update_arp_entry: will not add non-unicast IP address to ARP cache\n")); + return ERR_ARG; } - /* Walk through the ARP mapping table and try to find an entry to - update. If none is found, the IP -> MAC address mapping is - inserted in the ARP table. */ - for (i = 0; i < ARP_TABLE_SIZE; ++i) { - /* Check if the source IP address of the incoming packet matches - the IP address in this ARP table entry. */ - if (arp_table[i].state != ETHARP_STATE_EMPTY && - ip_addr_cmp(ipaddr, &arp_table[i].ipaddr)) { - /* pending entry? */ - if (arp_table[i].state == ETHARP_STATE_PENDING) { - LWIP_DEBUGF(ETHARP_DEBUG | DBG_TRACE, ("update_arp_entry: pending entry %u goes stable\n", i)); - /* A pending entry was found, mark it stable */ - arp_table[i].state = ETHARP_STATE_STABLE; - /* fall-through to next if */ - } - /* stable entry? (possibly just marked to become stable) */ - if (arp_table[i].state == ETHARP_STATE_STABLE) { -#if ARP_QUEUEING - struct pbuf *p; - struct eth_hdr *ethhdr; -#endif - LWIP_DEBUGF(ETHARP_DEBUG | DBG_TRACE, ("update_arp_entry: updating stable entry %u\n", i)); - /* An old entry found, update this and return. */ - for (k = 0; k < netif->hwaddr_len; ++k) { - arp_table[i].ethaddr.addr[k] = ethaddr->addr[k]; - } - /* reset time stamp */ - arp_table[i].ctime = 0; + /* find or create ARP entry */ + i = find_entry(ipaddr, flags); + /* bail out if no entry could be found */ + if (i < 0) return (err_t)i; + + /* mark it stable */ + arp_table[i].state = ETHARP_STATE_STABLE; + + LWIP_DEBUGF(ETHARP_DEBUG | DBG_TRACE, ("update_arp_entry: updating stable entry %"S16_F"\n", (s16_t)i)); + /* update address */ + for (k = 0; k < netif->hwaddr_len; ++k) { + arp_table[i].ethaddr.addr[k] = ethaddr->addr[k]; + } + /* reset time stamp */ + arp_table[i].ctime = 0; /* this is where we will send out queued packets! */ #if ARP_QUEUEING - while (arp_table[i].p != NULL) { - /* get the first packet on the queue (if any) */ - p = arp_table[i].p; - /* remember (and reference) remainder of queue */ - arp_table[i].p = pbuf_dequeue(p); - /* fill-in Ethernet header */ - ethhdr = p->payload; - for (k = 0; k < netif->hwaddr_len; ++k) { - ethhdr->dest.addr[k] = ethaddr->addr[k]; - ethhdr->src.addr[k] = netif->hwaddr[k]; - } - ethhdr->type = htons(ETHTYPE_IP); - LWIP_DEBUGF(ETHARP_DEBUG | DBG_TRACE, ("update_arp_entry: sending queued IP packet %p.\n", (void *)p)); - /* send the queued IP packet */ - netif->linkoutput(netif, p); - /* free the queued IP packet */ - pbuf_free(p); - } + while (arp_table[i].p != NULL) { + /* get the first packet on the queue */ + struct pbuf *p = arp_table[i].p; + /* Ethernet header */ + struct eth_hdr *ethhdr = p->payload; + /* remember (and reference) remainder of queue */ + /* note: this will also terminate the p pbuf chain */ + arp_table[i].p = pbuf_dequeue(p); + /* fill-in Ethernet header */ + for (k = 0; k < netif->hwaddr_len; ++k) { + ethhdr->dest.addr[k] = ethaddr->addr[k]; + ethhdr->src.addr[k] = netif->hwaddr[k]; + } + ethhdr->type = htons(ETHTYPE_IP); + LWIP_DEBUGF(ETHARP_DEBUG | DBG_TRACE, ("update_arp_entry: sending queued IP packet %p.\n", (void *)p)); + /* send the queued IP packet */ + netif->linkoutput(netif, p); + /* free the queued IP packet */ + pbuf_free(p); + } #endif - /* IP addresses should only occur once in the ARP entry, we are done */ - return NULL; - } - } /* if STABLE */ - } /* for all ARP entries */ - - /* no matching ARP entry was found */ - LWIP_ASSERT("update_arp_entry: i == ARP_TABLE_SIZE", i == ARP_TABLE_SIZE); - - LWIP_DEBUGF(ETHARP_DEBUG | DBG_TRACE, ("update_arp_entry: IP address not yet in table\n")); - /* allowed to insert a new entry? */ - if (flags & ARP_INSERT_FLAG) - { - LWIP_DEBUGF(ETHARP_DEBUG | DBG_TRACE, ("update_arp_entry: adding entry to table\n")); - /* find an empty or old entry. */ - i = find_arp_entry(); - if (i == ERR_MEM) { - LWIP_DEBUGF(ETHARP_DEBUG | DBG_TRACE, ("update_arp_entry: no available entry found\n")); - return NULL; - } - /* set IP address */ - ip_addr_set(&arp_table[i].ipaddr, ipaddr); - /* set Ethernet hardware address */ - for (k = 0; k < netif->hwaddr_len; ++k) { - arp_table[i].ethaddr.addr[k] = ethaddr->addr[k]; - } - /* reset time-stamp */ - arp_table[i].ctime = 0; - /* mark as stable */ - arp_table[i].state = ETHARP_STATE_STABLE; - /* no queued packet */ -#if ARP_QUEUEING - arp_table[i].p = NULL; -#endif - } - else - { - LWIP_DEBUGF(ETHARP_DEBUG | DBG_TRACE, ("update_arp_entry: no matching stable entry to update\n")); - } - return NULL; + return ERR_OK; } /** @@ -398,24 +427,25 @@ update_arp_entry(struct netif *netif, st * * @see pbuf_free() */ -struct pbuf * +void etharp_ip_input(struct netif *netif, struct pbuf *p) { struct ethip_hdr *hdr; - + LWIP_ASSERT("netif != NULL", netif != NULL); /* Only insert an entry if the source IP address of the incoming IP packet comes from a host on the local network. */ hdr = p->payload; - /* source is on local network? */ - if (!ip_addr_maskcmp(&(hdr->ip.src), &(netif->ip_addr), &(netif->netmask))) { + /* source is not on the local network? */ + if (!ip_addr_netcmp(&(hdr->ip.src), &(netif->ip_addr), &(netif->netmask))) { /* do nothing */ - return NULL; + return; } LWIP_DEBUGF(ETHARP_DEBUG | DBG_TRACE, ("etharp_ip_input: updating ETHARP table.\n")); - /* update ARP table, ask to insert entry */ - update_arp_entry(netif, &(hdr->ip.src), &(hdr->eth.src), ARP_INSERT_FLAG); - return NULL; + /* update ARP table */ + /* @todo We could use ETHARP_TRY_HARD if we think we are going to talk + * back soon (for example, if the destination IP address is ours. */ + update_arp_entry(netif, &(hdr->ip.src), &(hdr->eth.src), 0); } @@ -434,7 +464,7 @@ etharp_ip_input(struct netif *netif, str * * @see pbuf_free() */ -struct pbuf * +void etharp_arp_input(struct netif *netif, struct eth_addr *ethaddr, struct pbuf *p) { struct etharp_hdr *hdr; @@ -443,11 +473,13 @@ etharp_arp_input(struct netif *netif, st u8_t i; u8_t for_us; + LWIP_ASSERT("netif != NULL", netif != NULL); + /* drop short ARP packets */ if (p->tot_len < sizeof(struct etharp_hdr)) { - LWIP_DEBUGF(ETHARP_DEBUG | DBG_TRACE | 1, ("etharp_arp_input: packet dropped, too short (%d/%d)\n", p->tot_len, sizeof(struct etharp_hdr))); + LWIP_DEBUGF(ETHARP_DEBUG | DBG_TRACE | 1, ("etharp_arp_input: packet dropped, too short (%"S16_F"/%"S16_F")\n", p->tot_len, sizeof(struct etharp_hdr))); pbuf_free(p); - return NULL; + return; } hdr = p->payload; @@ -468,7 +500,7 @@ etharp_arp_input(struct netif *netif, st if (for_us) { /* add IP address in ARP cache; assume requester wants to talk to us. * can result in directly sending the queued packets for this host. */ - update_arp_entry(netif, &sipaddr, &(hdr->shwaddr), ARP_INSERT_FLAG); + update_arp_entry(netif, &sipaddr, &(hdr->shwaddr), ETHARP_TRY_HARD); /* ARP message not directed to us? */ } else { /* update the source IP address in the cache, if present */ @@ -521,77 +553,70 @@ etharp_arp_input(struct netif *netif, st } break; case ARP_REPLY: - /* ARP reply. We insert or update the ARP table later. */ + /* ARP reply. We already updated the ARP cache earlier. */ LWIP_DEBUGF(ETHARP_DEBUG | DBG_TRACE, ("etharp_arp_input: incoming ARP reply\n")); #if (LWIP_DHCP && DHCP_DOES_ARP_CHECK) - /* DHCP wants to know about ARP replies to our wanna-have-address */ - if (for_us) dhcp_arp_reply(netif, &sipaddr); + /* DHCP wants to know about ARP replies from any host with an + * IP address also offered to us by the DHCP server. We do not + * want to take a duplicate IP address on a single network. + * @todo How should we handle redundant (fail-over) interfaces? + * */ + dhcp_arp_reply(netif, &sipaddr); #endif break; default: - LWIP_DEBUGF(ETHARP_DEBUG | DBG_TRACE, ("etharp_arp_input: ARP unknown opcode type %d\n", htons(hdr->opcode))); + LWIP_DEBUGF(ETHARP_DEBUG | DBG_TRACE, ("etharp_arp_input: ARP unknown opcode type %"S16_F"\n", htons(hdr->opcode))); break; } /* free ARP packet */ pbuf_free(p); - p = NULL; - /* nothing to send, we did it! */ - return NULL; } /** * Resolve and fill-in Ethernet address header for outgoing packet. * - * If ARP has the Ethernet address in cache, the given packet is - * returned, ready to be sent. + * For IP multicast and broadcast, corresponding Ethernet addresses + * are selected and the packet is transmitted on the link. * - * If ARP does not have the Ethernet address in cache the packet is - * queued (if enabled and space available) and a ARP request is sent. - * This ARP request is returned as a pbuf, which should be sent by - * the caller. - * - * A returned non-NULL packet should be sent by the caller. - * - * If ARP failed to allocate resources, NULL is returned. + * For unicast addresses, the packet is submitted to etharp_query(). In + * case the IP address is outside the local network, the IP address of + * the gateway is used. * * @param netif The lwIP network interface which the IP packet will be sent on. * @param ipaddr The IP address of the packet destination. * @param pbuf The pbuf(s) containing the IP packet to be sent. * - * @return If non-NULL, a packet ready to be sent by caller. - * + * @return + * - ERR_RTE No route to destination (no gateway to external networks), + * or the return type of either etharp_query() or netif->linkoutput(). */ -struct pbuf * +err_t etharp_output(struct netif *netif, struct ip_addr *ipaddr, struct pbuf *q) { struct eth_addr *dest, *srcaddr, mcastaddr; struct eth_hdr *ethhdr; - s8_t i; + u8_t i; - /* make room for Ethernet header */ + /* make room for Ethernet header - should not fail */ if (pbuf_header(q, sizeof(struct eth_hdr)) != 0) { - /* The pbuf_header() call shouldn't fail, and we'll just bail - out if it does.. */ + /* bail out */ LWIP_DEBUGF(ETHARP_DEBUG | DBG_TRACE | 2, ("etharp_output: could not allocate room for header.\n")); LINK_STATS_INC(link.lenerr); - return NULL; + return ERR_BUF; } /* assume unresolved Ethernet address */ dest = NULL; - /* Construct Ethernet header. Start with looking up deciding which - MAC address to use as a destination address. Broadcasts and - multicasts are special, all other addresses are looked up in the - ARP table. */ + /* Determine on destination hardware address. Broadcasts and multicasts + * are special, other IP addresses are looked up in the ARP table. */ - /* destination IP address is an IP broadcast address? */ - if (ip_addr_isany(ipaddr) || ip_addr_isbroadcast(ipaddr, netif)) { + /* broadcast destination IP address? */ + if (ip_addr_isbroadcast(ipaddr, netif)) { /* broadcast on Ethernet also */ dest = (struct eth_addr *)ðbroadcast; - } - /* destination IP address is an IP multicast address? */ - else if (ip_addr_ismulticast(ipaddr)) { - /* Hash IP multicast address to MAC address. */ + /* multicast destination IP address? */ + } else if (ip_addr_ismulticast(ipaddr)) { + /* Hash IP multicast address to MAC address.*/ mcastaddr.addr[0] = 0x01; mcastaddr.addr[1] = 0x00; mcastaddr.addr[2] = 0x5e; @@ -600,192 +625,207 @@ etharp_output(struct netif *netif, struc mcastaddr.addr[5] = ip4_addr4(ipaddr); /* destination Ethernet address is multicast */ dest = &mcastaddr; - } - /* destination IP address is an IP unicast address */ - else { - /* destination IP network address not on local network? - * IP layer wants us to forward to the default gateway */ - if (!ip_addr_maskcmp(ipaddr, &(netif->ip_addr), &(netif->netmask))) { + /* unicast destination IP address? */ + } else { + /* outside local network? */ + if (!ip_addr_netcmp(ipaddr, &(netif->ip_addr), &(netif->netmask))) { /* interface has default gateway? */ - if (netif->gw.addr != 0) - { - /* route to default gateway IP address */ + if (netif->gw.addr != 0) { + /* send to hardware address of default gateway IP address */ ipaddr = &(netif->gw); - } - /* no gateway available? */ - else - { - /* IP destination address outside local network, but no gateway available */ - /* { packet is discarded } */ - return NULL; - } - } - - /* Ethernet address for IP destination address is in ARP cache? */ - for (i = 0; i < ARP_TABLE_SIZE; ++i) { - /* match found? */ - if (arp_table[i].state == ETHARP_STATE_STABLE && - ip_addr_cmp(ipaddr, &arp_table[i].ipaddr)) { - dest = &arp_table[i].ethaddr; - break; + /* no default gateway available */ + } else { + /* no route to destination error (default gateway missing) */ + return ERR_RTE; } } - /* could not find the destination Ethernet address in ARP cache? */ - if (dest == NULL) { - /* ARP query for the IP address, submit this IP packet for queueing */ - /* TODO: How do we handle netif->ipaddr == ipaddr? */ - etharp_query(netif, ipaddr, q); - /* { packet was queued (ERR_OK), or discarded } */ - /* return nothing */ - return NULL; - } - /* destination Ethernet address resolved from ARP cache */ - else - { - /* fallthrough */ - } + /* queue on destination Ethernet address belonging to ipaddr */ + return etharp_query(netif, ipaddr, q); } - /* destination Ethernet address known */ - if (dest != NULL) { - /* obtain source Ethernet address of the given interface */ - srcaddr = (struct eth_addr *)netif->hwaddr; - - /* A valid IP->MAC address mapping was found, fill in the - * Ethernet header for the outgoing packet */ - ethhdr = q->payload; - - for(i = 0; i < netif->hwaddr_len; i++) { - ethhdr->dest.addr[i] = dest->addr[i]; - ethhdr->src.addr[i] = srcaddr->addr[i]; - } - - ethhdr->type = htons(ETHTYPE_IP); - /* return the outgoing packet */ - return q; + /* continuation for multicast/broadcast destinations */ + /* obtain source Ethernet address of the given interface */ + srcaddr = (struct eth_addr *)netif->hwaddr; + ethhdr = q->payload; + for (i = 0; i < netif->hwaddr_len; i++) { + ethhdr->dest.addr[i] = dest->addr[i]; + ethhdr->src.addr[i] = srcaddr->addr[i]; } - /* never reached; here for safety */ - return NULL; + ethhdr->type = htons(ETHTYPE_IP); + /* send packet directly on the link */ + return netif->linkoutput(netif, q); } /** - * Send an ARP request for the given IP address. + * Send an ARP request for the given IP address and/or queue a packet. + * + * If the IP address was not yet in the cache, a pending ARP cache entry + * is added and an ARP request is sent for the given address. The packet + * is queued on this entry. * - * Sends an ARP request for the given IP address, unless - * a request for this address is already pending. Optionally - * queues an outgoing packet on the resulting ARP entry. + * If the IP address was already pending in the cache, a new ARP request + * is sent for the given address. The packet is queued on this entry. * - * @param netif The lwIP network interface where ipaddr + * If the IP address was already stable in the cache, and a packet is + * given, it is directly sent and no ARP request is sent out. + * + * If the IP address was already stable in the cache, and no packet is + * given, an ARP request is sent out. + * + * @param netif The lwIP network interface on which ipaddr * must be queried for. * @param ipaddr The IP address to be resolved. - * @param q If non-NULL, a pbuf that must be queued on the - * ARP entry for the ipaddr IP address. - * - * @return NULL. + * @param q If non-NULL, a pbuf that must be delivered to the IP address. + * q is not freed by this function. * - * @note Might be used in the future by manual IP configuration - * as well. + * @return + * - ERR_BUF Could not make room for Ethernet header. + * - ERR_MEM Hardware address unknown, and no more ARP entries available + * to query for address or queue the packet. + * - ERR_MEM Could not queue packet due to memory shortage. + * - ERR_RTE No route to destination (no gateway to external networks). + * - ERR_ARG Non-unicast address given, those will not appear in ARP cache. * - * TODO: use the ctime field to see how long ago an ARP request was sent, - * possibly retry. */ err_t etharp_query(struct netif *netif, struct ip_addr *ipaddr, struct pbuf *q) { - struct eth_addr *srcaddr; - struct etharp_hdr *hdr; - err_t result = ERR_OK; - s8_t i; - u8_t perform_arp_request = 1; - /* prevent 'unused argument' warning if ARP_QUEUEING == 0 */ - (void)q; - srcaddr = (struct eth_addr *)netif->hwaddr; - /* bail out if this IP address is pending */ - for (i = 0; i < ARP_TABLE_SIZE; ++i) { - if (arp_table[i].state != ETHARP_STATE_EMPTY && - ip_addr_cmp(ipaddr, &arp_table[i].ipaddr)) { - if (arp_table[i].state == ETHARP_STATE_PENDING) { - LWIP_DEBUGF(ETHARP_DEBUG | DBG_TRACE | DBG_STATE, ("etharp_query: requested IP already pending as entry %u\n", i)); - /* break out of for-loop, user may wish to queue a packet on a pending entry */ - /* TODO: we will issue a new ARP request, which should not occur too often */ - /* we might want to run a faster timer on ARP to limit this */ - break; - } - else if (arp_table[i].state == ETHARP_STATE_STABLE) { - LWIP_DEBUGF(ETHARP_DEBUG | DBG_TRACE | DBG_STATE, ("etharp_query: requested IP already stable as entry %u\n", i)); - /* User wishes to queue a packet on a stable entry (or does she want to send - * out the packet immediately, we will not know), so we force an ARP request. - * Upon response we will send out the queued packet in etharp_update(). - * - * Alternatively, we could accept the stable entry, and just send out the packet - * immediately. I chose to implement the former approach. - */ - perform_arp_request = (q?1:0); - break; - } - } + struct eth_addr * srcaddr = (struct eth_addr *)netif->hwaddr; + err_t result = ERR_MEM; + s8_t i; /* ARP entry index */ + u8_t k; /* Ethernet address octet index */ + + /* non-unicast address? */ + if (ip_addr_isbroadcast(ipaddr, netif) || + ip_addr_ismulticast(ipaddr) || + ip_addr_isany(ipaddr)) { + LWIP_DEBUGF(ETHARP_DEBUG | DBG_TRACE, ("etharp_query: will not add non-unicast IP address to ARP cache\n")); + return ERR_ARG; } - /* queried address not yet in ARP table? */ - if (i == ARP_TABLE_SIZE) { - LWIP_DEBUGF(ETHARP_DEBUG | DBG_TRACE, ("etharp_query: IP address not found in ARP table\n")); - /* find an available (unused or old) entry */ - i = find_arp_entry(); - /* bail out if no ARP entries are available */ - if (i == ERR_MEM) { - LWIP_DEBUGF(ETHARP_DEBUG | 2, ("etharp_query: no more ARP entries available. Should seldom occur.\n")); - return ERR_MEM; - } - /* i is available, create ARP entry */ + + /* find entry in ARP cache, ask to create entry if queueing packet */ + i = find_entry(ipaddr, ETHARP_TRY_HARD); + + /* could not find or create entry? */ + if (i < 0) + { + LWIP_DEBUGF(ETHARP_DEBUG | DBG_TRACE, ("etharp_query: could not create ARP entry\n")); + if (q) LWIP_DEBUGF(ETHARP_DEBUG | DBG_TRACE, ("etharp_query: packet dropped\n")); + return (err_t)i; + } + + /* mark a fresh entry as pending (we just sent a request) */ + if (arp_table[i].state == ETHARP_STATE_EMPTY) { arp_table[i].state = ETHARP_STATE_PENDING; - ip_addr_set(&arp_table[i].ipaddr, ipaddr); + } + + /* { i is either a STABLE or (new or existing) PENDING entry } */ + LWIP_ASSERT("arp_table[i].state == PENDING or STABLE", + ((arp_table[i].state == ETHARP_STATE_PENDING) || + (arp_table[i].state == ETHARP_STATE_STABLE))); + + /* do we have a pending entry? or an implicit query request? */ + if ((arp_table[i].state == ETHARP_STATE_PENDING) || (q == NULL)) { + /* try to resolve it; send out ARP request */ + result = etharp_request(netif, ipaddr); } - /* { i is now valid } */ -#if ARP_QUEUEING /* queue packet (even on a stable entry, see above) */ - /* copy any PBUF_REF referenced payloads into PBUF_RAM */ - q = pbuf_take(q); - pbuf_queue(arp_table[i].p, q); + + /* packet given? */ + if (q != NULL) { + /* stable entry? */ + if (arp_table[i].state == ETHARP_STATE_STABLE) { + /* we have a valid IP->Ethernet address mapping, + * fill in the Ethernet header for the outgoing packet */ + struct eth_hdr *ethhdr = q->payload; + for(k = 0; k < netif->hwaddr_len; k++) { + ethhdr->dest.addr[k] = arp_table[i].ethaddr.addr[k]; + ethhdr->src.addr[k] = srcaddr->addr[k]; + } + ethhdr->type = htons(ETHTYPE_IP); + LWIP_DEBUGF(ETHARP_DEBUG | DBG_TRACE, ("etharp_query: sending packet %p\n", (void *)q)); + /* send the packet */ + result = netif->linkoutput(netif, q); + /* pending entry? (either just created or already pending */ + } else if (arp_table[i].state == ETHARP_STATE_PENDING) { +#if ARP_QUEUEING /* queue the given q packet */ + struct pbuf *p; + /* copy any PBUF_REF referenced payloads into PBUF_RAM */ + /* (the caller of lwIP assumes the referenced payload can be + * freed after it returns from the lwIP call that brought us here) */ + p = pbuf_take(q); + /* packet could be taken over? */ + if (p != NULL) { + /* queue packet ... */ + if (arp_table[i].p == NULL) { + /* ... in the empty queue */ + pbuf_ref(p); + arp_table[i].p = p; +#if 0 /* multi-packet-queueing disabled, see bug #11400 */ + } else { + /* ... at tail of non-empty queue */ + pbuf_queue(arp_table[i].p, p); #endif - /* ARP request? */ - if (perform_arp_request) - { - struct pbuf *p; - /* allocate a pbuf for the outgoing ARP request packet */ - p = pbuf_alloc(PBUF_LINK, sizeof(struct etharp_hdr), PBUF_RAM); - /* could allocate pbuf? */ - if (p != NULL) { - u8_t j; - LWIP_DEBUGF(ETHARP_DEBUG | DBG_TRACE, ("etharp_query: sending ARP request.\n")); - hdr = p->payload; - hdr->opcode = htons(ARP_REQUEST); - for (j = 0; j < netif->hwaddr_len; ++j) - { - hdr->shwaddr.addr[j] = srcaddr->addr[j]; - /* the hardware address is what we ask for, in - * a request it is a don't-care, we use 0's */ - hdr->dhwaddr.addr[j] = 0x00; + } + LWIP_DEBUGF(ETHARP_DEBUG | DBG_TRACE, ("etharp_query: queued packet %p on ARP entry %"S16_F"\n", (void *)q, (s16_t)i)); + result = ERR_OK; + } else { + LWIP_DEBUGF(ETHARP_DEBUG | DBG_TRACE, ("etharp_query: could not queue a copy of PBUF_REF packet %p (out of memory)\n", (void *)q)); + /* { result == ERR_MEM } through initialization */ } - hdr->dipaddr = *(struct ip_addr2 *)ipaddr; - hdr->sipaddr = *(struct ip_addr2 *)&netif->ip_addr; - - hdr->hwtype = htons(HWTYPE_ETHERNET); - ARPH_HWLEN_SET(hdr, netif->hwaddr_len); - - hdr->proto = htons(ETHTYPE_IP); - ARPH_PROTOLEN_SET(hdr, sizeof(struct ip_addr)); - for (j = 0; j < netif->hwaddr_len; ++j) - { - hdr->ethhdr.dest.addr[j] = 0xff; - hdr->ethhdr.src.addr[j] = srcaddr->addr[j]; - } - hdr->ethhdr.type = htons(ETHTYPE_ARP); - /* send ARP query */ - result = netif->linkoutput(netif, p); - /* free ARP query packet */ - pbuf_free(p); - p = NULL; - } else { - result = ERR_MEM; - LWIP_DEBUGF(ETHARP_DEBUG | DBG_TRACE | 2, ("etharp_query: could not allocate pbuf for ARP request.\n")); +#else /* ARP_QUEUEING == 0 */ + /* q && state == PENDING && ARP_QUEUEING == 0 => result = ERR_MEM */ + /* { result == ERR_MEM } through initialization */ + LWIP_DEBUGF(ETHARP_DEBUG | DBG_TRACE, ("etharp_query: Ethernet destination address unknown, queueing disabled, packet %p dropped\n", (void *)q)); +#endif } } return result; } + +err_t etharp_request(struct netif *netif, struct ip_addr *ipaddr) +{ + struct pbuf *p; + struct eth_addr * srcaddr = (struct eth_addr *)netif->hwaddr; + err_t result = ERR_OK; + u8_t k; /* ARP entry index */ + + /* allocate a pbuf for the outgoing ARP request packet */ + p = pbuf_alloc(PBUF_LINK, sizeof(struct etharp_hdr), PBUF_RAM); + /* could allocate a pbuf for an ARP request? */ + if (p != NULL) { + struct etharp_hdr *hdr = p->payload; + LWIP_DEBUGF(ETHARP_DEBUG | DBG_TRACE, ("etharp_request: sending ARP request.\n")); + hdr->opcode = htons(ARP_REQUEST); + for (k = 0; k < netif->hwaddr_len; k++) + { + hdr->shwaddr.addr[k] = srcaddr->addr[k]; + /* the hardware address is what we ask for, in + * a request it is a don't-care value, we use zeroes */ + hdr->dhwaddr.addr[k] = 0x00; + } + hdr->dipaddr = *(struct ip_addr2 *)ipaddr; + hdr->sipaddr = *(struct ip_addr2 *)&netif->ip_addr; + + hdr->hwtype = htons(HWTYPE_ETHERNET); + ARPH_HWLEN_SET(hdr, netif->hwaddr_len); + + hdr->proto = htons(ETHTYPE_IP); + ARPH_PROTOLEN_SET(hdr, sizeof(struct ip_addr)); + for (k = 0; k < netif->hwaddr_len; ++k) + { + /* broadcast to all network interfaces on the local network */ + hdr->ethhdr.dest.addr[k] = 0xff; + hdr->ethhdr.src.addr[k] = srcaddr->addr[k]; + } + hdr->ethhdr.type = htons(ETHTYPE_ARP); + /* send ARP query */ + result = netif->linkoutput(netif, p); + /* free ARP query packet */ + pbuf_free(p); + p = NULL; + /* could not allocate pbuf for ARP request */ + } else { + result = ERR_MEM; + LWIP_DEBUGF(ETHARP_DEBUG | DBG_TRACE | 2, ("etharp_request: could not allocate pbuf for ARP request.\n")); + } + return result; +}
--- a/packages/net/lwip_tcpip/current/tests/httpd.c +++ b/packages/net/lwip_tcpip/current/tests/httpd.c @@ -39,7 +39,7 @@ #include "lwip/tcp.h" struct http_state { - char *file; + const char *file; u32_t left; u8_t retries; }; @@ -171,7 +171,7 @@ http_recv(void *arg, struct tcp_pcb *pcb } } - hs->file = &sdata; + hs->file = sdata; hs->left = sizeof(sdata); pbuf_free(p); @@ -250,7 +250,7 @@ tmain(cyg_addrword_t p) sys_thread_new(httpd_init, (void*)"httpd",7); } -#define STACK_SIZE 0x4000 +#define STACK_SIZE 0x1000 static char stack[STACK_SIZE]; static cyg_thread thread_data; static cyg_handle_t thread_handle;
--- a/packages/net/lwip_tcpip/current/tests/nc_test_slave.c +++ b/packages/net/lwip_tcpip/current/tests/nc_test_slave.c @@ -185,13 +185,13 @@ do_udp_test(int s1, struct nc_request *r if ((ntohl(tdp->key1) == NC_TEST_DATA_KEY1) && (ntohl(tdp->key2) == NC_TEST_DATA_KEY2)) { if (ntohl(tdp->seq) != seq) { - test_printf("Packets out of sequence - recvd: %d, expected: %d\n", + test_printf("Packets out of sequence - recvd: %ld, expected: %d\n", ntohl(tdp->seq), seq); seq = ntohl(tdp->seq); seq_errors++; } } else { - test_printf("Bad data packet - key: %lx/%lx, seq: %d\n", + test_printf("Bad data packet - key: %lx/%lx, seq: %ld\n", ntohl(tdp->key1), ntohl(tdp->key2), ntohl(tdp->seq)); } @@ -358,13 +358,13 @@ do_tcp_test(int s1, struct nc_request *r if ((ntohl(tdp->key1) == NC_TEST_DATA_KEY1) && (ntohl(tdp->key2) == NC_TEST_DATA_KEY2)) { if (ntohl(tdp->seq) != seq) { - test_printf("Packets out of sequence - recvd: %d, expected: %d\n", + test_printf("Packets out of sequence - recvd: %ld, expected: %d\n", ntohl(tdp->seq), seq); seq = ntohl(tdp->seq); seq_errors++; } } else { - test_printf("Bad data packet - key: %lx/%lx, seq: %d\n", + test_printf("Bad data packet - key: %lx/%lx, seq: %ld\n", ntohl(tdp->key1), ntohl(tdp->key2), ntohl(tdp->seq)); } @@ -452,22 +452,22 @@ nc_slave(test_param_t param) done = true; break; case NC_REQUEST_UDP_SEND: - test_printf("UDP send - %d buffers, %d bytes\n", ntohl(req.nbufs), ntohl(req.buflen)); + test_printf("UDP send - %ld buffers, %ld bytes\n", ntohl(req.nbufs), ntohl(req.buflen)); break; case NC_REQUEST_UDP_RECV: - test_printf("UDP recv - %d buffers, %d bytes\n", ntohl(req.nbufs), ntohl(req.buflen)); + test_printf("UDP recv - %ld buffers, %ld bytes\n", ntohl(req.nbufs), ntohl(req.buflen)); break; case NC_REQUEST_UDP_ECHO: - test_printf("UDP echo - %d buffers, %d bytes\n", ntohl(req.nbufs), ntohl(req.buflen)); + test_printf("UDP echo - %ld buffers, %ld bytes\n", ntohl(req.nbufs), ntohl(req.buflen)); break; case NC_REQUEST_TCP_SEND: - test_printf("TCP send - %d buffers, %d bytes\n", ntohl(req.nbufs), ntohl(req.buflen)); + test_printf("TCP send - %ld buffers, %ld bytes\n", ntohl(req.nbufs), ntohl(req.buflen)); break; case NC_REQUEST_TCP_RECV: - test_printf("TCP recv - %d buffers, %d bytes\n", ntohl(req.nbufs), ntohl(req.buflen)); + test_printf("TCP recv - %ld buffers, %ld bytes\n", ntohl(req.nbufs), ntohl(req.buflen)); break; case NC_REQUEST_TCP_ECHO: - test_printf("TCP echo - %d buffers, %d bytes\n", ntohl(req.nbufs), ntohl(req.buflen)); + test_printf("TCP echo - %ld buffers, %ld bytes\n", ntohl(req.nbufs), ntohl(req.buflen)); break; case NC_REQUEST_SET_LOAD: start_load(ntohl(req.nbufs)); @@ -487,7 +487,7 @@ nc_slave(test_param_t param) reply.misc.idle_results.count[1] = htonl((long)idle_thread_count); break; default: - test_printf("Unrecognized request: %d\n", ntohl(req.type)); + test_printf("Unrecognized request: %ld\n", ntohl(req.type)); reply.response = htonl(NC_REPLY_NAK); reply.reason = htonl(NC_REPLY_NAK_UNKNOWN_REQUEST); break;
--- a/packages/net/lwip_tcpip/current/tests/socket.c +++ b/packages/net/lwip_tcpip/current/tests/socket.c @@ -68,7 +68,7 @@ tmain(cyg_addrword_t p) sys_thread_new(socket_thread, (void*)"socket",7); } -#define STACK_SIZE 0x4000 +#define STACK_SIZE 0x1000 static char stack[STACK_SIZE]; static cyg_thread thread_data; static cyg_handle_t thread_handle;
--- a/packages/net/lwip_tcpip/current/tests/tcpecho.c +++ b/packages/net/lwip_tcpip/current/tests/tcpecho.c @@ -82,7 +82,7 @@ tmain(cyg_addrword_t p) sys_thread_new(tcpecho_thread, (void*)"tcpecho",7); } -#define STACK_SIZE 0x4000 +#define STACK_SIZE 0x1000 static char stack[STACK_SIZE]; static cyg_thread thread_data; static cyg_handle_t thread_handle;
--- a/packages/net/lwip_tcpip/current/tests/udpecho.c +++ b/packages/net/lwip_tcpip/current/tests/udpecho.c @@ -65,7 +65,7 @@ void tmain(cyg_addrword_t p) sys_thread_new(udpecho_thread, (void*)"udpecho",7); } -#define STACK_SIZE 0x4000 +#define STACK_SIZE 0x1000 static char stack[STACK_SIZE]; static cyg_thread thread_data; static cyg_handle_t thread_handle;