lwip_netif.c

00001 /**
00002  * @file
00003  * lwIP network interface abstraction
00004  */
00005 
00006 /*
00007  * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
00008  * All rights reserved.
00009  *
00010  * Redistribution and use in source and binary forms, with or without modification,
00011  * are permitted provided that the following conditions are met:
00012  *
00013  * 1. Redistributions of source code must retain the above copyright notice,
00014  *    this list of conditions and the following disclaimer.
00015  * 2. Redistributions in binary form must reproduce the above copyright notice,
00016  *    this list of conditions and the following disclaimer in the documentation
00017  *    and/or other materials provided with the distribution.
00018  * 3. The name of the author may not be used to endorse or promote products
00019  *    derived from this software without specific prior written permission.
00020  *
00021  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
00022  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
00023  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
00024  * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
00025  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
00026  * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
00027  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
00028  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
00029  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
00030  * OF SUCH DAMAGE.
00031  *
00032  * This file is part of the lwIP TCP/IP stack.
00033  *
00034  * Author: Adam Dunkels <adam@sics.se>
00035  */
00036 
00037 /**
00038  * @defgroup netif Network interface (NETIF)
00039  * @ingroup callbackstyle_api
00040  */
00041 
00042 #include "lwip/opt.h"
00043 
00044 #include "lwip/def.h"
00045 #include "lwip/ip_addr.h"
00046 #include "lwip/ip6_addr.h"
00047 #include "lwip/netif.h"
00048 #include "lwip/priv/tcp_priv.h"
00049 #include "lwip/udp.h"
00050 #include "lwip/snmp.h"
00051 #include "lwip/igmp.h"
00052 #include "lwip/etharp.h"
00053 #include "lwip/stats.h"
00054 #include "lwip/sys.h"
00055 #if ENABLE_LOOPBACK
00056 #include "lwip/sys.h"
00057 #if LWIP_NETIF_LOOPBACK_MULTITHREADING
00058 #include "lwip/tcpip.h"
00059 #endif /* LWIP_NETIF_LOOPBACK_MULTITHREADING */
00060 #endif /* ENABLE_LOOPBACK */
00061 
00062 #if LWIP_AUTOIP
00063 #include "lwip/autoip.h"
00064 #endif /* LWIP_AUTOIP */
00065 #if LWIP_DHCP
00066 #include "lwip/dhcp.h"
00067 #endif /* LWIP_DHCP */
00068 #if LWIP_IPV6_DHCP6
00069 #include "lwip/dhcp6.h"
00070 #endif /* LWIP_IPV6_DHCP6 */
00071 #if LWIP_IPV6_MLD
00072 #include "lwip/mld6.h"
00073 #endif /* LWIP_IPV6_MLD */
00074 #if LWIP_IPV6
00075 #include "lwip/nd6.h"
00076 #endif
00077 
00078 #if LWIP_NETIF_STATUS_CALLBACK
00079 #define NETIF_STATUS_CALLBACK(n) do{ if (n->status_callback) { (n->status_callback)(n); }}while(0)
00080 #else
00081 #define NETIF_STATUS_CALLBACK(n)
00082 #endif /* LWIP_NETIF_STATUS_CALLBACK */
00083 
00084 #if LWIP_NETIF_LINK_CALLBACK
00085 #define NETIF_LINK_CALLBACK(n) do{ if (n->link_callback) { (n->link_callback)(n); }}while(0)
00086 #else
00087 #define NETIF_LINK_CALLBACK(n)
00088 #endif /* LWIP_NETIF_LINK_CALLBACK */
00089 
00090 struct netif *netif_list;
00091 struct netif *netif_default;
00092 
00093 static u8_t netif_num;
00094 
00095 #define NETIF_REPORT_TYPE_IPV4  0x01
00096 #define NETIF_REPORT_TYPE_IPV6  0x02
00097 static void netif_issue_reports(struct netif* netif, u8_t report_type);
00098 
00099 #if LWIP_IPV6
00100 static err_t netif_null_output_ip6(struct netif *netif, struct pbuf *p, const ip6_addr_t *ipaddr);
00101 #endif /* LWIP_IPV6 */
00102 
00103 #if LWIP_HAVE_LOOPIF
00104 #if LWIP_IPV4
00105 static err_t netif_loop_output_ipv4(struct netif *netif, struct pbuf *p, const ip4_addr_t* addr);
00106 #endif
00107 #if LWIP_IPV6
00108 static err_t netif_loop_output_ipv6(struct netif *netif, struct pbuf *p, const ip6_addr_t* addr);
00109 #endif
00110 
00111 
00112 static struct netif loop_netif;
00113 
00114 /**
00115  * Initialize a lwip network interface structure for a loopback interface
00116  *
00117  * @param netif the lwip network interface structure for this loopif
00118  * @return ERR_OK if the loopif is initialized
00119  *         ERR_MEM if private data couldn't be allocated
00120  */
00121 static err_t
00122 netif_loopif_init(struct netif *netif)
00123 {
00124   /* initialize the snmp variables and counters inside the struct netif
00125    * ifSpeed: no assumption can be made!
00126    */
00127   MIB2_INIT_NETIF(netif, snmp_ifType_softwareLoopback, 0);
00128 
00129   netif->name[0] = 'l';
00130   netif->name[1] = 'o';
00131 #if LWIP_IPV4
00132   netif->output = netif_loop_output_ipv4;
00133 #endif
00134 #if LWIP_IPV6
00135   netif->output_ip6 = netif_loop_output_ipv6;
00136 #endif
00137 #if LWIP_LOOPIF_MULTICAST
00138   netif->flags |= NETIF_FLAG_IGMP;
00139 #endif
00140   return ERR_OK;
00141 }
00142 #endif /* LWIP_HAVE_LOOPIF */
00143 
00144 void
00145 netif_init(void)
00146 {
00147 #if LWIP_HAVE_LOOPIF
00148 #if LWIP_IPV4
00149 #define LOOPIF_ADDRINIT &loop_ipaddr, &loop_netmask, &loop_gw,
00150   ip4_addr_t loop_ipaddr, loop_netmask, loop_gw;
00151   IP4_ADDR(&loop_gw, 127,0,0,1);
00152   IP4_ADDR(&loop_ipaddr, 127,0,0,1);
00153   IP4_ADDR(&loop_netmask, 255,0,0,0);
00154 #else /* LWIP_IPV4 */
00155 #define LOOPIF_ADDRINIT
00156 #endif /* LWIP_IPV4 */
00157 
00158 #if NO_SYS
00159   netif_add(&loop_netif, LOOPIF_ADDRINIT NULL, netif_loopif_init, ip_input);
00160 #else  /* NO_SYS */
00161   netif_add(&loop_netif, LOOPIF_ADDRINIT NULL, netif_loopif_init, tcpip_input);
00162 #endif /* NO_SYS */
00163 
00164 #if LWIP_IPV6
00165   IP_ADDR6(loop_netif.ip6_addr, 0, 0, 0, PP_HTONL(0x00000001UL));
00166   loop_netif.ip6_addr_state[0] = IP6_ADDR_VALID;
00167 #endif /* LWIP_IPV6 */
00168 
00169   netif_set_link_up(&loop_netif);
00170   netif_set_up(&loop_netif);
00171 
00172 #endif /* LWIP_HAVE_LOOPIF */
00173 }
00174 
00175 /**
00176  * @ingroup lwip_nosys
00177  * Forwards a received packet for input processing with
00178  * ethernet_input() or ip_input() depending on netif flags.
00179  * Don't call directly, pass to netif_add() and call
00180  * netif->input().
00181  * Only works if the netif driver correctly sets 
00182  * NETIF_FLAG_ETHARP and/or NETIF_FLAG_ETHERNET flag!
00183  */
00184 err_t
00185 netif_input(struct pbuf *p, struct netif *inp)
00186 {
00187 #if LWIP_ETHERNET
00188   if (inp->flags & (NETIF_FLAG_ETHARP | NETIF_FLAG_ETHERNET)) {
00189     return ethernet_input(p, inp);
00190   } else
00191 #endif /* LWIP_ETHERNET */
00192   return ip_input(p, inp);
00193 }
00194 
00195 /**
00196  * @ingroup netif
00197  * Add a network interface to the list of lwIP netifs.
00198  *
00199  * @param netif a pre-allocated netif structure
00200  * @param ipaddr IP address for the new netif
00201  * @param netmask network mask for the new netif
00202  * @param gw default gateway IP address for the new netif
00203  * @param state opaque data passed to the new netif
00204  * @param init callback function that initializes the interface
00205  * @param input callback function that is called to pass
00206  * ingress packets up in the protocol layer stack.\n
00207  * It is recommended to use a function that passes the input directly
00208  * to the stack (netif_input(), NO_SYS=1 mode) or via sending a
00209  * message to TCPIP thread (tcpip_input(), NO_SYS=0 mode).\n
00210  * These functions use netif flags NETIF_FLAG_ETHARP and NETIF_FLAG_ETHERNET
00211  * to decide whether to forward to ethernet_input() or ip_input().
00212  * In other words, the functions only work when the netif
00213  * driver is implemented correctly!
00214  *
00215  * @return netif, or NULL if failed.
00216  */
00217 struct netif *
00218 netif_add(struct netif *netif,
00219 #if LWIP_IPV4
00220           const ip4_addr_t *ipaddr, const ip4_addr_t *netmask, const ip4_addr_t *gw,
00221 #endif /* LWIP_IPV4 */
00222           void *state, netif_init_fn init, netif_input_fn input)
00223 {
00224 #if LWIP_IPV6
00225   s8_t i;
00226 #endif
00227 
00228   LWIP_ASSERT("No init function given", init != NULL);
00229 
00230   /* reset new interface configuration state */
00231 #if LWIP_IPV4
00232   ip_addr_set_zero_ip4(&netif->ip_addr);
00233   ip_addr_set_zero_ip4(&netif->netmask);
00234   ip_addr_set_zero_ip4(&netif->gw);
00235 #endif /* LWIP_IPV4 */
00236 #if LWIP_IPV6
00237   for (i = 0; i < LWIP_IPV6_NUM_ADDRESSES; i++) {
00238     ip_addr_set_zero_ip6(&netif->ip6_addr[i]);
00239     netif->ip6_addr_state[0] = IP6_ADDR_INVALID;
00240   }
00241   netif->output_ip6 = netif_null_output_ip6;
00242 #endif /* LWIP_IPV6 */
00243   NETIF_SET_CHECKSUM_CTRL(netif, NETIF_CHECKSUM_ENABLE_ALL);
00244   netif->flags = 0;
00245 #if LWIP_DHCP
00246   /* netif not under DHCP control by default */
00247   netif->dhcp = NULL;
00248 #endif /* LWIP_DHCP */
00249 #if LWIP_AUTOIP
00250   /* netif not under AutoIP control by default */
00251   netif->autoip = NULL;
00252 #endif /* LWIP_AUTOIP */
00253 #if LWIP_IPV6_AUTOCONFIG
00254   /* IPv6 address autoconfiguration not enabled by default */
00255   netif->ip6_autoconfig_enabled = 0;
00256 #endif /* LWIP_IPV6_AUTOCONFIG */
00257 #if LWIP_IPV6_SEND_ROUTER_SOLICIT
00258   netif->rs_count = LWIP_ND6_MAX_MULTICAST_SOLICIT;
00259 #endif /* LWIP_IPV6_SEND_ROUTER_SOLICIT */
00260 #if LWIP_IPV6_DHCP6
00261   /* netif not under DHCPv6 control by default */
00262   netif->dhcp6 = NULL;
00263 #endif /* LWIP_IPV6_DHCP6 */
00264 #if LWIP_NETIF_STATUS_CALLBACK
00265   netif->status_callback = NULL;
00266 #endif /* LWIP_NETIF_STATUS_CALLBACK */
00267 #if LWIP_NETIF_LINK_CALLBACK
00268   netif->link_callback = NULL;
00269 #endif /* LWIP_NETIF_LINK_CALLBACK */
00270 #if LWIP_IGMP
00271   netif->igmp_mac_filter = NULL;
00272 #endif /* LWIP_IGMP */
00273 #if LWIP_IPV6 && LWIP_IPV6_MLD
00274   netif->mld_mac_filter = NULL;
00275 #endif /* LWIP_IPV6 && LWIP_IPV6_MLD */
00276 #if ENABLE_LOOPBACK
00277   netif->loop_first = NULL;
00278   netif->loop_last = NULL;
00279 #endif /* ENABLE_LOOPBACK */
00280 
00281   /* remember netif specific state information data */
00282   netif->state = state;
00283   netif->num = netif_num++;
00284   netif->input = input;
00285 
00286   NETIF_SET_HWADDRHINT(netif, NULL);
00287 #if ENABLE_LOOPBACK && LWIP_LOOPBACK_MAX_PBUFS
00288   netif->loop_cnt_current = 0;
00289 #endif /* ENABLE_LOOPBACK && LWIP_LOOPBACK_MAX_PBUFS */
00290 
00291 #if LWIP_IPV4
00292   netif_set_addr(netif, ipaddr, netmask, gw);
00293 #endif /* LWIP_IPV4 */
00294 
00295   /* call user specified initialization function for netif */
00296   if (init(netif) != ERR_OK) {
00297     return NULL;
00298   }
00299 
00300   /* add this netif to the list */
00301   netif->next = netif_list;
00302   netif_list = netif;
00303   mib2_netif_added(netif);
00304 
00305 #if LWIP_IGMP
00306   /* start IGMP processing */
00307   if (netif->flags & NETIF_FLAG_IGMP) {
00308     igmp_start(netif);
00309   }
00310 #endif /* LWIP_IGMP */
00311 
00312   LWIP_DEBUGF(NETIF_DEBUG, ("netif: added interface %c%c IP",
00313     netif->name[0], netif->name[1]));
00314 #if LWIP_IPV4
00315   LWIP_DEBUGF(NETIF_DEBUG, (" addr "));
00316   ip4_addr_debug_print(NETIF_DEBUG, ipaddr);
00317   LWIP_DEBUGF(NETIF_DEBUG, (" netmask "));
00318   ip4_addr_debug_print(NETIF_DEBUG, netmask);
00319   LWIP_DEBUGF(NETIF_DEBUG, (" gw "));
00320   ip4_addr_debug_print(NETIF_DEBUG, gw);
00321 #endif /* LWIP_IPV4 */
00322   LWIP_DEBUGF(NETIF_DEBUG, ("\n"));
00323   return netif;
00324 }
00325 
00326 #if LWIP_IPV4
00327 /**
00328  * @ingroup netif
00329  * Change IP address configuration for a network interface (including netmask
00330  * and default gateway).
00331  *
00332  * @param netif the network interface to change
00333  * @param ipaddr the new IP address
00334  * @param netmask the new netmask
00335  * @param gw the new default gateway
00336  */
00337 void
00338 netif_set_addr(struct netif *netif, const ip4_addr_t *ipaddr, const ip4_addr_t *netmask,
00339     const ip4_addr_t *gw)
00340 {
00341   if (ip4_addr_isany(ipaddr)) {
00342     /* when removing an address, we have to remove it *before* changing netmask/gw
00343        to ensure that tcp RST segment can be sent correctly */
00344     netif_set_ipaddr(netif, ipaddr);
00345     netif_set_netmask(netif, netmask);
00346     netif_set_gw(netif, gw);
00347   } else {
00348     netif_set_netmask(netif, netmask);
00349     netif_set_gw(netif, gw);
00350     /* set ipaddr last to ensure netmask/gw have been set when status callback is called */
00351     netif_set_ipaddr(netif, ipaddr);
00352   }
00353 }
00354 #endif /* LWIP_IPV4*/
00355 
00356 /**
00357  * @ingroup netif
00358  * Remove a network interface from the list of lwIP netifs.
00359  *
00360  * @param netif the network interface to remove
00361  */
00362 void
00363 netif_remove(struct netif *netif)
00364 {
00365   if (netif == NULL) {
00366     return;
00367   }
00368 
00369 #if LWIP_IPV4
00370   if (!ip4_addr_isany_val(*netif_ip4_addr(netif))) {
00371 #if LWIP_TCP
00372     tcp_netif_ipv4_addr_changed(netif_ip4_addr(netif), NULL);
00373 #endif /* LWIP_TCP */
00374     /* cannot do this for UDP, as there is no 'err' callback in udp pcbs */
00375   }
00376 
00377 #if LWIP_IGMP
00378   /* stop IGMP processing */
00379   if (netif->flags & NETIF_FLAG_IGMP) {
00380     igmp_stop(netif);
00381   }
00382 #endif /* LWIP_IGMP */
00383 #endif /* LWIP_IPV4*/
00384 
00385 #if LWIP_IPV6 && LWIP_IPV6_MLD
00386   /* stop MLD processing */
00387   mld6_stop(netif);
00388 #endif /* LWIP_IPV6 && LWIP_IPV6_MLD */
00389   if (netif_is_up(netif)) {
00390     /* set netif down before removing (call callback function) */
00391     netif_set_down(netif);
00392   }
00393 
00394   mib2_remove_ip4(netif);
00395 
00396   /* this netif is default? */
00397   if (netif_default == netif) {
00398     /* reset default netif */
00399     netif_set_default(NULL);
00400   }
00401   /*  is it the first netif? */
00402   if (netif_list == netif) {
00403     netif_list = netif->next;
00404   } else {
00405     /*  look for netif further down the list */
00406     struct netif * tmp_netif;
00407     for (tmp_netif = netif_list; tmp_netif != NULL; tmp_netif = tmp_netif->next) {
00408       if (tmp_netif->next == netif) {
00409         tmp_netif->next = netif->next;
00410         break;
00411       }
00412     }
00413     if (tmp_netif == NULL) {
00414       return; /* netif is not on the list */
00415     }
00416   }
00417   mib2_netif_removed(netif);
00418 #if LWIP_NETIF_REMOVE_CALLBACK
00419   if (netif->remove_callback) {
00420     netif->remove_callback(netif);
00421   }
00422 #endif /* LWIP_NETIF_REMOVE_CALLBACK */
00423   LWIP_DEBUGF( NETIF_DEBUG, ("netif_remove: removed netif\n") );
00424 }
00425 
00426 /**
00427  * @ingroup netif
00428  * Find a network interface by searching for its name
00429  *
00430  * @param name the name of the netif (like netif->name) plus concatenated number
00431  * in ascii representation (e.g. 'en0')
00432  */
00433 struct netif *
00434 netif_find(const char *name)
00435 {
00436   struct netif *netif;
00437   u8_t num;
00438 
00439   if (name == NULL) {
00440     return NULL;
00441   }
00442 
00443   num = name[2] - '0';
00444 
00445   for (netif = netif_list; netif != NULL; netif = netif->next) {
00446     if (num == netif->num &&
00447        name[0] == netif->name[0] &&
00448        name[1] == netif->name[1]) {
00449       LWIP_DEBUGF(NETIF_DEBUG, ("netif_find: found %c%c\n", name[0], name[1]));
00450       return netif;
00451     }
00452   }
00453   LWIP_DEBUGF(NETIF_DEBUG, ("netif_find: didn't find %c%c\n", name[0], name[1]));
00454   return NULL;
00455 }
00456 
00457 #if LWIP_IPV4
00458 /**
00459  * @ingroup netif
00460  * Change the IP address of a network interface
00461  *
00462  * @param netif the network interface to change
00463  * @param ipaddr the new IP address
00464  *
00465  * @note call netif_set_addr() if you also want to change netmask and
00466  * default gateway
00467  */
00468 void
00469 netif_set_ipaddr(struct netif *netif, const ip4_addr_t *ipaddr)
00470 {
00471   ip4_addr_t new_addr = (ipaddr ? *ipaddr : *IP4_ADDR_ANY);
00472   /* address is actually being changed? */
00473   if (ip4_addr_cmp(&new_addr, netif_ip4_addr(netif)) == 0) {
00474     LWIP_DEBUGF(NETIF_DEBUG | LWIP_DBG_STATE, ("netif_set_ipaddr: netif address being changed\n"));
00475 #if LWIP_TCP
00476     tcp_netif_ipv4_addr_changed(netif_ip4_addr(netif), ipaddr);
00477 #endif /* LWIP_TCP */
00478 #if LWIP_UDP
00479     udp_netif_ipv4_addr_changed(netif_ip4_addr(netif), ipaddr);
00480 #endif /* LWIP_UDP */
00481 
00482     mib2_remove_ip4(netif);
00483     mib2_remove_route_ip4(0, netif);
00484     /* set new IP address to netif */
00485     ip4_addr_set(ip_2_ip4(&netif->ip_addr), ipaddr);
00486     IP_SET_TYPE_VAL(netif->ip_addr, IPADDR_TYPE_V4);
00487     mib2_add_ip4(netif);
00488     mib2_add_route_ip4(0, netif);
00489 
00490     netif_issue_reports(netif, NETIF_REPORT_TYPE_IPV4);
00491 
00492     NETIF_STATUS_CALLBACK(netif);
00493   }
00494 
00495   LWIP_DEBUGF(NETIF_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("netif: IP address of interface %c%c set to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
00496     netif->name[0], netif->name[1],
00497     ip4_addr1_16(netif_ip4_addr(netif)),
00498     ip4_addr2_16(netif_ip4_addr(netif)),
00499     ip4_addr3_16(netif_ip4_addr(netif)),
00500     ip4_addr4_16(netif_ip4_addr(netif))));
00501 }
00502 
00503 /**
00504  * @ingroup netif
00505  * Change the default gateway for a network interface
00506  *
00507  * @param netif the network interface to change
00508  * @param gw the new default gateway
00509  *
00510  * @note call netif_set_addr() if you also want to change ip address and netmask
00511  */
00512 void
00513 netif_set_gw(struct netif *netif, const ip4_addr_t *gw)
00514 {
00515   ip4_addr_set(ip_2_ip4(&netif->gw), gw);
00516   IP_SET_TYPE_VAL(netif->gw, IPADDR_TYPE_V4);
00517   LWIP_DEBUGF(NETIF_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("netif: GW address of interface %c%c set to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
00518     netif->name[0], netif->name[1],
00519     ip4_addr1_16(netif_ip4_gw(netif)),
00520     ip4_addr2_16(netif_ip4_gw(netif)),
00521     ip4_addr3_16(netif_ip4_gw(netif)),
00522     ip4_addr4_16(netif_ip4_gw(netif))));
00523 }
00524 
00525 /**
00526  * @ingroup netif
00527  * Change the netmask of a network interface
00528  *
00529  * @param netif the network interface to change
00530  * @param netmask the new netmask
00531  *
00532  * @note call netif_set_addr() if you also want to change ip address and
00533  * default gateway
00534  */
00535 void
00536 netif_set_netmask(struct netif *netif, const ip4_addr_t *netmask)
00537 {
00538   mib2_remove_route_ip4(0, netif);
00539   /* set new netmask to netif */
00540   ip4_addr_set(ip_2_ip4(&netif->netmask), netmask);
00541   IP_SET_TYPE_VAL(netif->netmask, IPADDR_TYPE_V4);
00542   mib2_add_route_ip4(0, netif);
00543   LWIP_DEBUGF(NETIF_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("netif: netmask of interface %c%c set to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
00544     netif->name[0], netif->name[1],
00545     ip4_addr1_16(netif_ip4_netmask(netif)),
00546     ip4_addr2_16(netif_ip4_netmask(netif)),
00547     ip4_addr3_16(netif_ip4_netmask(netif)),
00548     ip4_addr4_16(netif_ip4_netmask(netif))));
00549 }
00550 #endif /* LWIP_IPV4 */
00551 
00552 /**
00553  * @ingroup netif
00554  * Set a network interface as the default network interface
00555  * (used to output all packets for which no specific route is found)
00556  *
00557  * @param netif the default network interface
00558  */
00559 void
00560 netif_set_default(struct netif *netif)
00561 {
00562   if (netif == NULL) {
00563     /* remove default route */
00564     mib2_remove_route_ip4(1, netif);
00565   } else {
00566     /* install default route */
00567     mib2_add_route_ip4(1, netif);
00568   }
00569   netif_default = netif;
00570   LWIP_DEBUGF(NETIF_DEBUG, ("netif: setting default interface %c%c\n",
00571            netif ? netif->name[0] : '\'', netif ? netif->name[1] : '\''));
00572 }
00573 
00574 /**
00575  * @ingroup netif
00576  * Bring an interface up, available for processing
00577  * traffic.
00578  */
00579 void
00580 netif_set_up(struct netif *netif)
00581 {
00582   if (!(netif->flags & NETIF_FLAG_UP)) {
00583     netif->flags |= NETIF_FLAG_UP;
00584 
00585     MIB2_COPY_SYSUPTIME_TO(&netif->ts);
00586 
00587     NETIF_STATUS_CALLBACK(netif);
00588 
00589     if (netif->flags & NETIF_FLAG_LINK_UP) {
00590       netif_issue_reports(netif, NETIF_REPORT_TYPE_IPV4|NETIF_REPORT_TYPE_IPV6);
00591     }
00592   }
00593 }
00594 
00595 /** Send ARP/IGMP/MLD/RS events, e.g. on link-up/netif-up or addr-change
00596  */
00597 static void
00598 netif_issue_reports(struct netif* netif, u8_t report_type)
00599 {
00600 #if LWIP_IPV4
00601   if ((report_type & NETIF_REPORT_TYPE_IPV4) &&
00602       !ip4_addr_isany_val(*netif_ip4_addr(netif))) {
00603 #if LWIP_ARP
00604     /* For Ethernet network interfaces, we would like to send a "gratuitous ARP" */
00605     if (netif->flags & (NETIF_FLAG_ETHARP)) {
00606       etharp_gratuitous(netif);
00607     }
00608 #endif /* LWIP_ARP */
00609 
00610 #if LWIP_IGMP
00611     /* resend IGMP memberships */
00612     if (netif->flags & NETIF_FLAG_IGMP) {
00613       igmp_report_groups(netif);
00614     }
00615 #endif /* LWIP_IGMP */
00616   }
00617 #endif /* LWIP_IPV4 */
00618 
00619 #if LWIP_IPV6
00620   if (report_type & NETIF_REPORT_TYPE_IPV6) {
00621 #if LWIP_IPV6_MLD
00622     /* send mld memberships */
00623     mld6_report_groups(netif);
00624 #endif /* LWIP_IPV6_MLD */
00625 #if LWIP_IPV6_SEND_ROUTER_SOLICIT
00626     /* Send Router Solicitation messages. */
00627     netif->rs_count = LWIP_ND6_MAX_MULTICAST_SOLICIT;
00628 #endif /* LWIP_IPV6_SEND_ROUTER_SOLICIT */
00629   }
00630 #endif /* LWIP_IPV6 */
00631 }
00632 
00633 /**
00634  * @ingroup netif
00635  * Bring an interface down, disabling any traffic processing.
00636  */
00637 void
00638 netif_set_down(struct netif *netif)
00639 {
00640   if (netif->flags & NETIF_FLAG_UP) {
00641     netif->flags &= ~NETIF_FLAG_UP;
00642     MIB2_COPY_SYSUPTIME_TO(&netif->ts);
00643 
00644 #if LWIP_IPV4 && LWIP_ARP
00645     if (netif->flags & NETIF_FLAG_ETHARP) {
00646       etharp_cleanup_netif(netif);
00647     }
00648 #endif /* LWIP_IPV4 && LWIP_ARP */
00649 
00650 #if LWIP_IPV6
00651     nd6_cleanup_netif(netif);
00652 #endif /* LWIP_IPV6 */
00653 
00654     NETIF_STATUS_CALLBACK(netif);
00655   }
00656 }
00657 
00658 #if LWIP_NETIF_STATUS_CALLBACK
00659 /**
00660  * @ingroup netif
00661  * Set callback to be called when interface is brought up/down or address is changed while up
00662  */
00663 void
00664 netif_set_status_callback(struct netif *netif, netif_status_callback_fn status_callback)
00665 {
00666   if (netif) {
00667     netif->status_callback = status_callback;
00668   }
00669 }
00670 #endif /* LWIP_NETIF_STATUS_CALLBACK */
00671 
00672 #if LWIP_NETIF_REMOVE_CALLBACK
00673 /**
00674  * @ingroup netif
00675  * Set callback to be called when the interface has been removed
00676  */
00677 void
00678 netif_set_remove_callback(struct netif *netif, netif_status_callback_fn remove_callback)
00679 {
00680   if (netif) {
00681     netif->remove_callback = remove_callback;
00682   }
00683 }
00684 #endif /* LWIP_NETIF_REMOVE_CALLBACK */
00685 
00686 /**
00687  * @ingroup netif
00688  * Called by a driver when its link goes up
00689  */
00690 void
00691 netif_set_link_up(struct netif *netif)
00692 {
00693   if (!(netif->flags & NETIF_FLAG_LINK_UP)) {
00694     netif->flags |= NETIF_FLAG_LINK_UP;
00695 
00696 #if LWIP_DHCP
00697     if (netif->dhcp) {
00698       dhcp_network_changed(netif);
00699     }
00700 #endif /* LWIP_DHCP */
00701 
00702 #if LWIP_AUTOIP
00703     if (netif->autoip) {
00704       autoip_network_changed(netif);
00705     }
00706 #endif /* LWIP_AUTOIP */
00707 
00708     if (netif->flags & NETIF_FLAG_UP) {
00709       netif_issue_reports(netif, NETIF_REPORT_TYPE_IPV4|NETIF_REPORT_TYPE_IPV6);
00710     }
00711     NETIF_LINK_CALLBACK(netif);
00712   }
00713 }
00714 
00715 /**
00716  * @ingroup netif
00717  * Called by a driver when its link goes down
00718  */
00719 void
00720 netif_set_link_down(struct netif *netif )
00721 {
00722   if (netif->flags & NETIF_FLAG_LINK_UP) {
00723     netif->flags &= ~NETIF_FLAG_LINK_UP;
00724     NETIF_LINK_CALLBACK(netif);
00725   }
00726 }
00727 
00728 #if LWIP_NETIF_LINK_CALLBACK
00729 /**
00730  * @ingroup netif
00731  * Set callback to be called when link is brought up/down
00732  */
00733 void
00734 netif_set_link_callback(struct netif *netif, netif_status_callback_fn link_callback)
00735 {
00736   if (netif) {
00737     netif->link_callback = link_callback;
00738   }
00739 }
00740 #endif /* LWIP_NETIF_LINK_CALLBACK */
00741 
00742 #if ENABLE_LOOPBACK
00743 /**
00744  * @ingroup netif
00745  * Send an IP packet to be received on the same netif (loopif-like).
00746  * The pbuf is simply copied and handed back to netif->input.
00747  * In multithreaded mode, this is done directly since netif->input must put
00748  * the packet on a queue.
00749  * In callback mode, the packet is put on an internal queue and is fed to
00750  * netif->input by netif_poll().
00751  *
00752  * @param netif the lwip network interface structure
00753  * @param p the (IP) packet to 'send'
00754  * @return ERR_OK if the packet has been sent
00755  *         ERR_MEM if the pbuf used to copy the packet couldn't be allocated
00756  */
00757 err_t
00758 netif_loop_output(struct netif *netif, struct pbuf *p)
00759 {
00760   struct pbuf *r;
00761   err_t err;
00762   struct pbuf *last;
00763 #if LWIP_LOOPBACK_MAX_PBUFS
00764   u8_t clen = 0;
00765 #endif /* LWIP_LOOPBACK_MAX_PBUFS */
00766   /* If we have a loopif, SNMP counters are adjusted for it,
00767    * if not they are adjusted for 'netif'. */
00768 #if MIB2_STATS
00769 #if LWIP_HAVE_LOOPIF
00770   struct netif *stats_if = &loop_netif;
00771 #else /* LWIP_HAVE_LOOPIF */
00772   struct netif *stats_if = netif;
00773 #endif /* LWIP_HAVE_LOOPIF */
00774 #endif /* MIB2_STATS */
00775   SYS_ARCH_DECL_PROTECT(lev);
00776 
00777   /* Allocate a new pbuf */
00778   r = pbuf_alloc(PBUF_LINK, p->tot_len, PBUF_RAM);
00779   if (r == NULL) {
00780     LINK_STATS_INC(link.memerr);
00781     LINK_STATS_INC(link.drop);
00782     MIB2_STATS_NETIF_INC(stats_if, ifoutdiscards);
00783     return ERR_MEM;
00784   }
00785 #if LWIP_LOOPBACK_MAX_PBUFS
00786   clen = pbuf_clen(r);
00787   /* check for overflow or too many pbuf on queue */
00788   if (((netif->loop_cnt_current + clen) < netif->loop_cnt_current) ||
00789      ((netif->loop_cnt_current + clen) > LWIP_LOOPBACK_MAX_PBUFS)) {
00790     pbuf_free(r);
00791     LINK_STATS_INC(link.memerr);
00792     LINK_STATS_INC(link.drop);
00793     MIB2_STATS_NETIF_INC(stats_if, ifoutdiscards);
00794     return ERR_MEM;
00795   }
00796   netif->loop_cnt_current += clen;
00797 #endif /* LWIP_LOOPBACK_MAX_PBUFS */
00798 
00799   /* Copy the whole pbuf queue p into the single pbuf r */
00800   if ((err = pbuf_copy(r, p)) != ERR_OK) {
00801     pbuf_free(r);
00802     LINK_STATS_INC(link.memerr);
00803     LINK_STATS_INC(link.drop);
00804     MIB2_STATS_NETIF_INC(stats_if, ifoutdiscards);
00805     return err;
00806   }
00807 
00808   /* Put the packet on a linked list which gets emptied through calling
00809      netif_poll(). */
00810 
00811   /* let last point to the last pbuf in chain r */
00812   for (last = r; last->next != NULL; last = last->next);
00813 
00814   SYS_ARCH_PROTECT(lev);
00815   if (netif->loop_first != NULL) {
00816     LWIP_ASSERT("if first != NULL, last must also be != NULL", netif->loop_last != NULL);
00817     netif->loop_last->next = r;
00818     netif->loop_last = last;
00819   } else {
00820     netif->loop_first = r;
00821     netif->loop_last = last;
00822   }
00823   SYS_ARCH_UNPROTECT(lev);
00824 
00825   LINK_STATS_INC(link.xmit);
00826   MIB2_STATS_NETIF_ADD(stats_if, ifoutoctets, p->tot_len);
00827   MIB2_STATS_NETIF_INC(stats_if, ifoutucastpkts);
00828 
00829 #if LWIP_NETIF_LOOPBACK_MULTITHREADING
00830   /* For multithreading environment, schedule a call to netif_poll */
00831   tcpip_callback_with_block((tcpip_callback_fn)netif_poll, netif, 0);
00832 #endif /* LWIP_NETIF_LOOPBACK_MULTITHREADING */
00833 
00834   return ERR_OK;
00835 }
00836 
00837 #if LWIP_HAVE_LOOPIF
00838 #if LWIP_IPV4
00839 static err_t
00840 netif_loop_output_ipv4(struct netif *netif, struct pbuf *p, const ip4_addr_t* addr)
00841 {
00842   LWIP_UNUSED_ARG(addr);
00843   return netif_loop_output(netif, p);
00844 }
00845 #endif /* LWIP_IPV4 */
00846 
00847 #if LWIP_IPV6
00848 static err_t
00849 netif_loop_output_ipv6(struct netif *netif, struct pbuf *p, const ip6_addr_t* addr)
00850 {
00851   LWIP_UNUSED_ARG(addr);
00852   return netif_loop_output(netif, p);
00853 }
00854 #endif /* LWIP_IPV6 */
00855 #endif /* LWIP_HAVE_LOOPIF */
00856 
00857 
00858 /**
00859  * Call netif_poll() in the main loop of your application. This is to prevent
00860  * reentering non-reentrant functions like tcp_input(). Packets passed to
00861  * netif_loop_output() are put on a list that is passed to netif->input() by
00862  * netif_poll().
00863  */
00864 void
00865 netif_poll(struct netif *netif)
00866 {
00867   struct pbuf *in;
00868   /* If we have a loopif, SNMP counters are adjusted for it,
00869    * if not they are adjusted for 'netif'. */
00870 #if MIB2_STATS
00871 #if LWIP_HAVE_LOOPIF
00872   struct netif *stats_if = &loop_netif;
00873 #else /* LWIP_HAVE_LOOPIF */
00874   struct netif *stats_if = netif;
00875 #endif /* LWIP_HAVE_LOOPIF */
00876 #endif /* MIB2_STATS */
00877   SYS_ARCH_DECL_PROTECT(lev);
00878 
00879   do {
00880     /* Get a packet from the list. With SYS_LIGHTWEIGHT_PROT=1, this is protected */
00881     SYS_ARCH_PROTECT(lev);
00882     in = netif->loop_first;
00883     if (in != NULL) {
00884       struct pbuf *in_end = in;
00885 #if LWIP_LOOPBACK_MAX_PBUFS
00886       u8_t clen = 1;
00887 #endif /* LWIP_LOOPBACK_MAX_PBUFS */
00888       while (in_end->len != in_end->tot_len) {
00889         LWIP_ASSERT("bogus pbuf: len != tot_len but next == NULL!", in_end->next != NULL);
00890         in_end = in_end->next;
00891 #if LWIP_LOOPBACK_MAX_PBUFS
00892         clen++;
00893 #endif /* LWIP_LOOPBACK_MAX_PBUFS */
00894       }
00895 #if LWIP_LOOPBACK_MAX_PBUFS
00896       /* adjust the number of pbufs on queue */
00897       LWIP_ASSERT("netif->loop_cnt_current underflow",
00898         ((netif->loop_cnt_current - clen) < netif->loop_cnt_current));
00899       netif->loop_cnt_current -= clen;
00900 #endif /* LWIP_LOOPBACK_MAX_PBUFS */
00901 
00902       /* 'in_end' now points to the last pbuf from 'in' */
00903       if (in_end == netif->loop_last) {
00904         /* this was the last pbuf in the list */
00905         netif->loop_first = netif->loop_last = NULL;
00906       } else {
00907         /* pop the pbuf off the list */
00908         netif->loop_first = in_end->next;
00909         LWIP_ASSERT("should not be null since first != last!", netif->loop_first != NULL);
00910       }
00911       /* De-queue the pbuf from its successors on the 'loop_' list. */
00912       in_end->next = NULL;
00913     }
00914     SYS_ARCH_UNPROTECT(lev);
00915 
00916     if (in != NULL) {
00917       LINK_STATS_INC(link.recv);
00918       MIB2_STATS_NETIF_ADD(stats_if, ifinoctets, in->tot_len);
00919       MIB2_STATS_NETIF_INC(stats_if, ifinucastpkts);
00920       /* loopback packets are always IP packets! */
00921       if (ip_input(in, netif) != ERR_OK) {
00922         pbuf_free(in);
00923       }
00924       /* Don't reference the packet any more! */
00925       in = NULL;
00926     }
00927   /* go on while there is a packet on the list */
00928   } while (netif->loop_first != NULL);
00929 }
00930 
00931 #if !LWIP_NETIF_LOOPBACK_MULTITHREADING
00932 /**
00933  * Calls netif_poll() for every netif on the netif_list.
00934  */
00935 void
00936 netif_poll_all(void)
00937 {
00938   struct netif *netif = netif_list;
00939   /* loop through netifs */
00940   while (netif != NULL) {
00941     netif_poll(netif);
00942     /* proceed to next network interface */
00943     netif = netif->next;
00944   }
00945 }
00946 #endif /* !LWIP_NETIF_LOOPBACK_MULTITHREADING */
00947 #endif /* ENABLE_LOOPBACK */
00948 
00949 #if LWIP_IPV6
00950 void
00951 netif_ip6_addr_set(struct netif *netif, s8_t addr_idx, ip6_addr_t *addr6)
00952 {
00953   LWIP_ASSERT("addr6 != NULL", addr6 != NULL);
00954   netif_ip6_addr_set_parts(netif, addr_idx, addr6->addr[0], addr6->addr[1],
00955     addr6->addr[2], addr6->addr[3]);
00956 }
00957 
00958 void
00959 netif_ip6_addr_set_parts(struct netif *netif, s8_t addr_idx, u32_t i0, u32_t i1, u32_t i2, u32_t i3)
00960 {
00961   const ip6_addr_t *old_addr;
00962   LWIP_ASSERT("netif != NULL", netif != NULL);
00963   LWIP_ASSERT("invalid index", addr_idx < LWIP_IPV6_NUM_ADDRESSES);
00964 
00965   old_addr = netif_ip6_addr(netif, addr_idx);
00966   /* address is actually being changed? */
00967   if ((old_addr->addr[0] != i0) || (old_addr->addr[1] != i1) ||
00968       (old_addr->addr[2] != i2) || (old_addr->addr[3] != i3)) {
00969     LWIP_DEBUGF(NETIF_DEBUG | LWIP_DBG_STATE, ("netif_ip6_addr_set: netif address being changed\n"));
00970 
00971     /* @todo: tcp_netif_ipv6_addr_changed()/udp_netif_ipv6_addr_changed() */
00972     /* @todo: remove/readd mib2 ip6 entries? */
00973 
00974     IP6_ADDR(ip_2_ip6(&(netif->ip6_addr[addr_idx])), i0, i1, i2, i3);
00975     IP_SET_TYPE_VAL(netif->ip6_addr[addr_idx], IPADDR_TYPE_V6);
00976 
00977     if (netif_ip6_addr_state(netif, addr_idx) & IP6_ADDR_VALID) {
00978       netif_issue_reports(netif, NETIF_REPORT_TYPE_IPV6);
00979       NETIF_STATUS_CALLBACK(netif);
00980     }
00981   }
00982 
00983   LWIP_DEBUGF(NETIF_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("netif: IPv6 address %d of interface %c%c set to %s/0x%"X8_F"\n",
00984     addr_idx, netif->name[0], netif->name[1], ip6addr_ntoa(netif_ip6_addr(netif, addr_idx)),
00985     netif_ip6_addr_state(netif, addr_idx)));
00986 }
00987 
00988 void
00989 netif_ip6_addr_set_state(struct netif* netif, s8_t addr_idx, u8_t state)
00990 {
00991   u8_t old_state;
00992   LWIP_ASSERT("netif != NULL", netif != NULL);
00993   LWIP_ASSERT("invalid index", addr_idx < LWIP_IPV6_NUM_ADDRESSES);
00994 
00995   old_state = netif_ip6_addr_state(netif, addr_idx);
00996   /* state is actually being changed? */
00997   if (old_state != state) {
00998     u8_t old_valid = old_state & IP6_ADDR_VALID;
00999     u8_t new_valid = state & IP6_ADDR_VALID;
01000     LWIP_DEBUGF(NETIF_DEBUG | LWIP_DBG_STATE, ("netif_ip6_addr_set_state: netif address state being changed\n"));
01001 
01002     if (old_valid && !new_valid) {
01003       /* address about to be removed by setting invalid */
01004       /* @todo: tcp_netif_ipv6_addr_changed()/udp_netif_ipv6_addr_changed() */
01005       /* @todo: remove mib2 ip6 entries? */
01006     }
01007     netif->ip6_addr_state[addr_idx] = state;
01008 
01009     if (!old_valid && new_valid) {
01010       /* address added by setting valid */
01011       /* @todo: add mib2 ip6 entries? */
01012       netif_issue_reports(netif, NETIF_REPORT_TYPE_IPV6);
01013     }
01014     if ((old_state & IP6_ADDR_PREFERRED) != (state & IP6_ADDR_PREFERRED)) {
01015       /* address state has changed (valid flag changed or switched between
01016          preferred and deprecated) -> call the callback function */
01017       NETIF_STATUS_CALLBACK(netif);
01018     }
01019   }
01020 
01021   LWIP_DEBUGF(NETIF_DEBUG | LWIP_DBG_TRACE | LWIP_DBG_STATE, ("netif: IPv6 address %d of interface %c%c set to %s/0x%"X8_F"\n",
01022     addr_idx, netif->name[0], netif->name[1], ip6addr_ntoa(netif_ip6_addr(netif, addr_idx)),
01023     netif_ip6_addr_state(netif, addr_idx)));
01024 }
01025 
01026 /**
01027  * Checks if a specific address is assigned to the netif and returns its
01028  * index.
01029  *
01030  * @param netif the netif to check
01031  * @param ip6addr the IPv6 address to find
01032  * @return >= 0: address found, this is its index
01033  *         -1: address not found on this netif
01034  */
01035 s8_t
01036 netif_get_ip6_addr_match(struct netif *netif, const ip6_addr_t *ip6addr)
01037 {
01038   s8_t i;
01039   for (i = 0; i < LWIP_IPV6_NUM_ADDRESSES; i++) {
01040     if (!ip6_addr_isinvalid(netif_ip6_addr_state(netif, i)) &&
01041         ip6_addr_cmp(netif_ip6_addr(netif, i), ip6addr)) {
01042       return i;
01043     }
01044   }
01045   return -1;
01046 }
01047 
01048 /**
01049  * @ingroup netif
01050  * Create a link-local IPv6 address on a netif (stored in slot 0)
01051  *
01052  * @param netif the netif to create the address on
01053  * @param from_mac_48bit if != 0, assume hwadr is a 48-bit MAC address (std conversion)
01054  *                       if == 0, use hwaddr directly as interface ID
01055  */
01056 void
01057 netif_create_ip6_linklocal_address(struct netif *netif, u8_t from_mac_48bit)
01058 {
01059   u8_t i, addr_index;
01060 
01061   /* Link-local prefix. */
01062   ip_2_ip6(&netif->ip6_addr[0])->addr[0] = PP_HTONL(0xfe800000ul);
01063   ip_2_ip6(&netif->ip6_addr[0])->addr[1] = 0;
01064 
01065   /* Generate interface ID. */
01066   if (from_mac_48bit) {
01067     /* Assume hwaddr is a 48-bit IEEE 802 MAC. Convert to EUI-64 address. Complement Group bit. */
01068     ip_2_ip6(&netif->ip6_addr[0])->addr[2] = htonl((((u32_t)(netif->hwaddr[0] ^ 0x02)) << 24) |
01069         ((u32_t)(netif->hwaddr[1]) << 16) |
01070         ((u32_t)(netif->hwaddr[2]) << 8) |
01071         (0xff));
01072     ip_2_ip6(&netif->ip6_addr[0])->addr[3] = htonl((0xfeul << 24) |
01073         ((u32_t)(netif->hwaddr[3]) << 16) |
01074         ((u32_t)(netif->hwaddr[4]) << 8) |
01075         (netif->hwaddr[5]));
01076   } else {
01077     /* Use hwaddr directly as interface ID. */
01078     ip_2_ip6(&netif->ip6_addr[0])->addr[2] = 0;
01079     ip_2_ip6(&netif->ip6_addr[0])->addr[3] = 0;
01080 
01081     addr_index = 3;
01082     for (i = 0; (i < 8) && (i < netif->hwaddr_len); i++) {
01083       if (i == 4) {
01084         addr_index--;
01085       }
01086       ip_2_ip6(&netif->ip6_addr[0])->addr[addr_index] |= ((u32_t)(netif->hwaddr[netif->hwaddr_len - i - 1])) << (8 * (i & 0x03));
01087     }
01088   }
01089 
01090   /* Set address state. */
01091 #if LWIP_IPV6_DUP_DETECT_ATTEMPTS
01092   /* Will perform duplicate address detection (DAD). */
01093   netif->ip6_addr_state[0] = IP6_ADDR_TENTATIVE;
01094 #else
01095   /* Consider address valid. */
01096   netif->ip6_addr_state[0] = IP6_ADDR_PREFERRED;
01097 #endif /* LWIP_IPV6_AUTOCONFIG */
01098 }
01099 
01100 /**
01101  * @ingroup netif
01102  * This function allows for the easy addition of a new IPv6 address to an interface.
01103  * It takes care of finding an empty slot and then sets the address tentative
01104  * (to make sure that all the subsequent processing happens).
01105  *
01106  * @param netif netif to add the address on
01107  * @param ip6addr address to add
01108  * @param chosen_idx if != NULL, the chosen IPv6 address index will be stored here
01109  */
01110 err_t
01111 netif_add_ip6_address(struct netif *netif, const ip6_addr_t *ip6addr, s8_t *chosen_idx)
01112 {
01113   s8_t i;
01114 
01115   i = netif_get_ip6_addr_match(netif, ip6addr);
01116   if (i >= 0) {
01117     /* Address already added */
01118     if (chosen_idx != NULL) {
01119       *chosen_idx = i;
01120     }
01121     return ERR_OK;
01122   }
01123 
01124   /* Find a free slot -- musn't be the first one (reserved for link local) */
01125   for (i = 1; i < LWIP_IPV6_NUM_ADDRESSES; i++) {
01126     if (!ip6_addr_isvalid(netif->ip6_addr_state[i])) {
01127       ip_addr_copy_from_ip6(netif->ip6_addr[i], *ip6addr);
01128       netif_ip6_addr_set_state(netif, i, IP6_ADDR_TENTATIVE);
01129       if (chosen_idx != NULL) {
01130         *chosen_idx = i;
01131       }
01132       return ERR_OK;
01133     }
01134   }
01135 
01136   if (chosen_idx != NULL) {
01137     *chosen_idx = -1;
01138   }
01139   return ERR_VAL;
01140 }
01141 
01142 /** Dummy IPv6 output function for netifs not supporting IPv6
01143  */
01144 static err_t
01145 netif_null_output_ip6(struct netif *netif, struct pbuf *p, const ip6_addr_t *ipaddr)
01146 {
01147   LWIP_UNUSED_ARG(netif);
01148   LWIP_UNUSED_ARG(p);
01149   LWIP_UNUSED_ARG(ipaddr);
01150 
01151   return ERR_IF;
01152 }
01153 #endif /* LWIP_IPV6 */