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Warning, cross-references for /kernel/lwip/core/netif.c need to be fixed. 

0001 /**
0002  * @file
0003  * lwIP network interface abstraction
0004  *
0005  */
0006 
0007 /*
0008  * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
0009  * All rights reserved.
0010  *
0011  * Redistribution and use in source and binary forms, with or without modification,
0012  * are permitted provided that the following conditions are met:
0013  *
0014  * 1. Redistributions of source code must retain the above copyright notice,
0015  *    this list of conditions and the following disclaimer.
0016  * 2. Redistributions in binary form must reproduce the above copyright notice,
0017  *    this list of conditions and the following disclaimer in the documentation
0018  *    and/or other materials provided with the distribution.
0019  * 3. The name of the author may not be used to endorse or promote products
0020  *    derived from this software without specific prior written permission.
0021  *
0022  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
0023  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
0024  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
0025  * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
0026  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
0027  * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
0028  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
0029  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
0030  * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
0031  * OF SUCH DAMAGE.
0032  *
0033  * This file is part of the lwIP TCP/IP stack.
0034  *
0035  * Author: Adam Dunkels <adam@sics.se>
0036  *
0037  */
0038 
0039 #include "lwip/opt.h"
0040 
0041 #include "lwip/def.h"
0042 #include "lwip/ip_addr.h"
0043 #include "lwip/netif.h"
0044 #include "lwip/tcp.h"
0045 #include "lwip/snmp.h"
0046 #include "lwip/igmp.h"
0047 #include "netif/etharp.h"
0048 #if ENABLE_LOOPBACK
0049 #include "lwip/sys.h"
0050 #if LWIP_NETIF_LOOPBACK_MULTITHREADING
0051 #include "lwip/tcpip.h"
0052 #endif /* LWIP_NETIF_LOOPBACK_MULTITHREADING */
0053 #endif /* ENABLE_LOOPBACK */
0054 
0055 #if LWIP_AUTOIP
0056 #include "lwip/autoip.h"
0057 #endif /* LWIP_AUTOIP */
0058 #if LWIP_DHCP
0059 #include "lwip/dhcp.h"
0060 #endif /* LWIP_DHCP */
0061 
0062 #if LWIP_NETIF_STATUS_CALLBACK
0063 #define NETIF_STATUS_CALLBACK(n) { if (n->status_callback) (n->status_callback)(n); }
0064 #else
0065 #define NETIF_STATUS_CALLBACK(n) { /* NOP */ }
0066 #endif /* LWIP_NETIF_STATUS_CALLBACK */ 
0067 
0068 #if LWIP_NETIF_LINK_CALLBACK
0069 #define NETIF_LINK_CALLBACK(n) { if (n->link_callback) (n->link_callback)(n); }
0070 #else
0071 #define NETIF_LINK_CALLBACK(n) { /* NOP */ }
0072 #endif /* LWIP_NETIF_LINK_CALLBACK */ 
0073 
0074 struct netif *netif_list;
0075 struct netif *netif_default;
0076 
0077 /**
0078  * Add a network interface to the list of lwIP netifs.
0079  *
0080  * @param netif a pre-allocated netif structure
0081  * @param ipaddr IP address for the new netif
0082  * @param netmask network mask for the new netif
0083  * @param gw default gateway IP address for the new netif
0084  * @param state opaque data passed to the new netif
0085  * @param init callback function that initializes the interface
0086  * @param input callback function that is called to pass
0087  * ingress packets up in the protocol layer stack.
0088  *
0089  * @return netif, or NULL if failed.
0090  */
0091 struct netif *
0092 netif_add(struct netif *netif, struct ip_addr *ipaddr, struct ip_addr *netmask,
0093   struct ip_addr *gw,
0094   void *state,
0095   err_t (* init)(struct netif *netif),
0096   err_t (* input)(struct pbuf *p, struct netif *netif))
0097 {
0098   static u8_t netifnum = 0;
0099 
0100   /* reset new interface configuration state */
0101   netif->ip_addr.addr = 0;
0102   netif->netmask.addr = 0;
0103   netif->gw.addr = 0;
0104   netif->flags = 0;
0105 #if LWIP_DHCP
0106   /* netif not under DHCP control by default */
0107   netif->dhcp = NULL;
0108 #endif /* LWIP_DHCP */
0109 #if LWIP_AUTOIP
0110   /* netif not under AutoIP control by default */
0111   netif->autoip = NULL;
0112 #endif /* LWIP_AUTOIP */
0113 #if LWIP_NETIF_STATUS_CALLBACK
0114   netif->status_callback = NULL;
0115 #endif /* LWIP_NETIF_STATUS_CALLBACK */
0116 #if LWIP_NETIF_LINK_CALLBACK
0117   netif->link_callback = NULL;
0118 #endif /* LWIP_NETIF_LINK_CALLBACK */
0119 #if LWIP_IGMP
0120   netif->igmp_mac_filter = NULL;
0121 #endif /* LWIP_IGMP */
0122 #if ENABLE_LOOPBACK
0123   netif->loop_first = NULL;
0124   netif->loop_last = NULL;
0125 #endif /* ENABLE_LOOPBACK */
0126 
0127   /* remember netif specific state information data */
0128   netif->state = state;
0129   netif->num = netifnum++;
0130   netif->input = input;
0131 #if LWIP_NETIF_HWADDRHINT
0132   netif->addr_hint = NULL;
0133 #endif /* LWIP_NETIF_HWADDRHINT*/
0134 #if ENABLE_LOOPBACK && LWIP_LOOPBACK_MAX_PBUFS
0135   netif->loop_cnt_current = 0;
0136 #endif /* ENABLE_LOOPBACK && LWIP_LOOPBACK_MAX_PBUFS */
0137 
0138   netif_set_addr(netif, ipaddr, netmask, gw);
0139 
0140   /* call user specified initialization function for netif */
0141   if (init(netif) != ERR_OK) {
0142     return NULL;
0143   }
0144 
0145   /* add this netif to the list */
0146   netif->next = netif_list;
0147   netif_list = netif;
0148   snmp_inc_iflist();
0149 
0150 #if LWIP_IGMP
0151   /* start IGMP processing */
0152   if (netif->flags & NETIF_FLAG_IGMP) {
0153     igmp_start( netif);
0154   }
0155 #endif /* LWIP_IGMP */
0156 
0157   LWIP_DEBUGF(NETIF_DEBUG, ("netif: added interface %c%c IP addr ",
0158     netif->name[0], netif->name[1]));
0159   ip_addr_debug_print(NETIF_DEBUG, ipaddr);
0160   LWIP_DEBUGF(NETIF_DEBUG, (" netmask "));
0161   ip_addr_debug_print(NETIF_DEBUG, netmask);
0162   LWIP_DEBUGF(NETIF_DEBUG, (" gw "));
0163   ip_addr_debug_print(NETIF_DEBUG, gw);
0164   LWIP_DEBUGF(NETIF_DEBUG, ("\n"));
0165   return netif;
0166 }
0167 
0168 /**
0169  * Change IP address configuration for a network interface (including netmask
0170  * and default gateway).
0171  *
0172  * @param netif the network interface to change
0173  * @param ipaddr the new IP address
0174  * @param netmask the new netmask
0175  * @param gw the new default gateway
0176  */
0177 void
0178 netif_set_addr(struct netif *netif, struct ip_addr *ipaddr, struct ip_addr *netmask,
0179     struct ip_addr *gw)
0180 {
0181   netif_set_ipaddr(netif, ipaddr);
0182   netif_set_netmask(netif, netmask);
0183   netif_set_gw(netif, gw);
0184 }
0185 
0186 /**
0187  * Remove a network interface from the list of lwIP netifs.
0188  *
0189  * @param netif the network interface to remove
0190  */
0191 void netif_remove(struct netif * netif)
0192 {
0193   if ( netif == NULL ) return;
0194 
0195 #if LWIP_IGMP
0196   /* stop IGMP processing */
0197   if (netif->flags & NETIF_FLAG_IGMP) {
0198     igmp_stop( netif);
0199   }
0200 #endif /* LWIP_IGMP */
0201 
0202   snmp_delete_ipaddridx_tree(netif);
0203 
0204   /*  is it the first netif? */
0205   if (netif_list == netif) {
0206     netif_list = netif->next;
0207     snmp_dec_iflist();
0208   }
0209   else {
0210     /*  look for netif further down the list */
0211     struct netif * tmpNetif;
0212     for (tmpNetif = netif_list; tmpNetif != NULL; tmpNetif = tmpNetif->next) {
0213       if (tmpNetif->next == netif) {
0214         tmpNetif->next = netif->next;
0215         snmp_dec_iflist();
0216         break;
0217       }
0218     }
0219     if (tmpNetif == NULL)
0220       return; /*  we didn't find any netif today */
0221   }
0222   /* this netif is default? */
0223   if (netif_default == netif)
0224     /* reset default netif */
0225     netif_set_default(NULL);
0226   LWIP_DEBUGF( NETIF_DEBUG, ("netif_remove: removed netif\n") );
0227 }
0228 
0229 /**
0230  * Find a network interface by searching for its name
0231  *
0232  * @param name the name of the netif (like netif->name) plus concatenated number
0233  * in ascii representation (e.g. 'en0')
0234  */
0235 struct netif *
0236 netif_find(char *name)
0237 {
0238   struct netif *netif;
0239   u8_t num;
0240 
0241   if (name == NULL) {
0242     return NULL;
0243   }
0244 
0245   num = name[2] - '0';
0246 
0247   for(netif = netif_list; netif != NULL; netif = netif->next) {
0248     if (num == netif->num &&
0249        name[0] == netif->name[0] &&
0250        name[1] == netif->name[1]) {
0251       LWIP_DEBUGF(NETIF_DEBUG, ("netif_find: found %c%c\n", name[0], name[1]));
0252       return netif;
0253     }
0254   }
0255   LWIP_DEBUGF(NETIF_DEBUG, ("netif_find: didn't find %c%c\n", name[0], name[1]));
0256   return NULL;
0257 }
0258 
0259 /**
0260  * Change the IP address of a network interface
0261  *
0262  * @param netif the network interface to change
0263  * @param ipaddr the new IP address
0264  *
0265  * @note call netif_set_addr() if you also want to change netmask and
0266  * default gateway
0267  */
0268 void
0269 netif_set_ipaddr(struct netif *netif, struct ip_addr *ipaddr)
0270 {
0271   /* TODO: Handling of obsolete pcbs */
0272   /* See:  http://mail.gnu.org/archive/html/lwip-users/2003-03/msg00118.html */
0273 #if LWIP_TCP
0274   struct tcp_pcb *pcb;
0275   struct tcp_pcb_listen *lpcb;
0276 
0277   /* address is actually being changed? */
0278   if ((ip_addr_cmp(ipaddr, &(netif->ip_addr))) == 0)
0279   {
0280     /* extern struct tcp_pcb *tcp_active_pcbs; defined by tcp.h */
0281     LWIP_DEBUGF(NETIF_DEBUG | LWIP_DBG_STATE, ("netif_set_ipaddr: netif address being changed\n"));
0282     pcb = tcp_active_pcbs;
0283     while (pcb != NULL) {
0284       /* PCB bound to current local interface address? */
0285       if (ip_addr_cmp(&(pcb->local_ip), &(netif->ip_addr))) {
0286         /* this connection must be aborted */
0287         struct tcp_pcb *next = pcb->next;
0288         LWIP_DEBUGF(NETIF_DEBUG | LWIP_DBG_STATE, ("netif_set_ipaddr: aborting TCP pcb %p\n", (void *)pcb));
0289         tcp_abort(pcb);
0290         pcb = next;
0291       } else {
0292         pcb = pcb->next;
0293       }
0294     }
0295     for (lpcb = tcp_listen_pcbs.listen_pcbs; lpcb != NULL; lpcb = lpcb->next) {
0296       /* PCB bound to current local interface address? */
0297       if ((!(ip_addr_isany(&(lpcb->local_ip)))) &&
0298           (ip_addr_cmp(&(lpcb->local_ip), &(netif->ip_addr)))) {
0299         /* The PCB is listening to the old ipaddr and
0300          * is set to listen to the new one instead */
0301         ip_addr_set(&(lpcb->local_ip), ipaddr);
0302       }
0303     }
0304   }
0305 #endif
0306   snmp_delete_ipaddridx_tree(netif);
0307   snmp_delete_iprteidx_tree(0,netif);
0308   /* set new IP address to netif */
0309   ip_addr_set(&(netif->ip_addr), ipaddr);
0310   snmp_insert_ipaddridx_tree(netif);
0311   snmp_insert_iprteidx_tree(0,netif);
0312 
0313   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",
0314     netif->name[0], netif->name[1],
0315     ip4_addr1(&netif->ip_addr),
0316     ip4_addr2(&netif->ip_addr),
0317     ip4_addr3(&netif->ip_addr),
0318     ip4_addr4(&netif->ip_addr)));
0319 }
0320 
0321 /**
0322  * Change the default gateway for a network interface
0323  *
0324  * @param netif the network interface to change
0325  * @param gw the new default gateway
0326  *
0327  * @note call netif_set_addr() if you also want to change ip address and netmask
0328  */
0329 void
0330 netif_set_gw(struct netif *netif, struct ip_addr *gw)
0331 {
0332   ip_addr_set(&(netif->gw), gw);
0333   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",
0334     netif->name[0], netif->name[1],
0335     ip4_addr1(&netif->gw),
0336     ip4_addr2(&netif->gw),
0337     ip4_addr3(&netif->gw),
0338     ip4_addr4(&netif->gw)));
0339 }
0340 
0341 /**
0342  * Change the netmask of a network interface
0343  *
0344  * @param netif the network interface to change
0345  * @param netmask the new netmask
0346  *
0347  * @note call netif_set_addr() if you also want to change ip address and
0348  * default gateway
0349  */
0350 void
0351 netif_set_netmask(struct netif *netif, struct ip_addr *netmask)
0352 {
0353   snmp_delete_iprteidx_tree(0, netif);
0354   /* set new netmask to netif */
0355   ip_addr_set(&(netif->netmask), netmask);
0356   snmp_insert_iprteidx_tree(0, netif);
0357   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",
0358     netif->name[0], netif->name[1],
0359     ip4_addr1(&netif->netmask),
0360     ip4_addr2(&netif->netmask),
0361     ip4_addr3(&netif->netmask),
0362     ip4_addr4(&netif->netmask)));
0363 }
0364 
0365 /**
0366  * Set a network interface as the default network interface
0367  * (used to output all packets for which no specific route is found)
0368  *
0369  * @param netif the default network interface
0370  */
0371 void
0372 netif_set_default(struct netif *netif)
0373 {
0374   if (netif == NULL)
0375   {
0376     /* remove default route */
0377     snmp_delete_iprteidx_tree(1, netif);
0378   }
0379   else
0380   {
0381     /* install default route */
0382     snmp_insert_iprteidx_tree(1, netif);
0383   }
0384   netif_default = netif;
0385   LWIP_DEBUGF(NETIF_DEBUG, ("netif: setting default interface %c%c\n",
0386            netif ? netif->name[0] : '\'', netif ? netif->name[1] : '\''));
0387 }
0388 
0389 /**
0390  * Bring an interface up, available for processing
0391  * traffic.
0392  * 
0393  * @note: Enabling DHCP on a down interface will make it come
0394  * up once configured.
0395  * 
0396  * @see dhcp_start()
0397  */ 
0398 void netif_set_up(struct netif *netif)
0399 {
0400   if ( !(netif->flags & NETIF_FLAG_UP )) {
0401     netif->flags |= NETIF_FLAG_UP;
0402     
0403 #if LWIP_SNMP
0404     snmp_get_sysuptime(&netif->ts);
0405 #endif /* LWIP_SNMP */
0406 
0407     NETIF_LINK_CALLBACK(netif);
0408     NETIF_STATUS_CALLBACK(netif);
0409 
0410 #if LWIP_ARP
0411     /* For Ethernet network interfaces, we would like to send a "gratuitous ARP" */ 
0412     if (netif->flags & NETIF_FLAG_ETHARP) {
0413       etharp_gratuitous(netif);
0414     }
0415 #endif /* LWIP_ARP */
0416 
0417 #if LWIP_IGMP
0418     /* resend IGMP memberships */
0419     if (netif->flags & NETIF_FLAG_IGMP) {
0420       igmp_report_groups( netif);
0421     }
0422 #endif /* LWIP_IGMP */
0423   }
0424 }
0425 
0426 /**
0427  * Bring an interface down, disabling any traffic processing.
0428  *
0429  * @note: Enabling DHCP on a down interface will make it come
0430  * up once configured.
0431  * 
0432  * @see dhcp_start()
0433  */ 
0434 void netif_set_down(struct netif *netif)
0435 {
0436   if ( netif->flags & NETIF_FLAG_UP )
0437     {
0438       netif->flags &= ~NETIF_FLAG_UP;
0439 #if LWIP_SNMP
0440       snmp_get_sysuptime(&netif->ts);
0441 #endif
0442       
0443       NETIF_LINK_CALLBACK(netif);
0444       NETIF_STATUS_CALLBACK(netif);
0445     }
0446 }
0447 
0448 /**
0449  * Ask if an interface is up
0450  */ 
0451 u8_t netif_is_up(struct netif *netif)
0452 {
0453   return (netif->flags & NETIF_FLAG_UP)?1:0;
0454 }
0455 
0456 #if LWIP_NETIF_STATUS_CALLBACK
0457 /**
0458  * Set callback to be called when interface is brought up/down
0459  */
0460 void netif_set_status_callback(struct netif *netif, void (* status_callback)(struct netif *netif ))
0461 {
0462     if ( netif )
0463         netif->status_callback = status_callback;
0464 }
0465 #endif /* LWIP_NETIF_STATUS_CALLBACK */
0466 
0467 #if LWIP_NETIF_LINK_CALLBACK
0468 /**
0469  * Called by a driver when its link goes up
0470  */
0471 void netif_set_link_up(struct netif *netif )
0472 {
0473   netif->flags |= NETIF_FLAG_LINK_UP;
0474 
0475 #if LWIP_DHCP
0476   if (netif->dhcp) {
0477     dhcp_network_changed(netif);
0478   }
0479 #endif /* LWIP_DHCP */
0480 
0481 #if LWIP_AUTOIP
0482   if (netif->autoip) {
0483     autoip_network_changed(netif);
0484   }
0485 #endif /* LWIP_AUTOIP */
0486 
0487   if (netif->flags & NETIF_FLAG_UP) {
0488 #if LWIP_ARP
0489   /* For Ethernet network interfaces, we would like to send a "gratuitous ARP" */ 
0490   if (netif->flags & NETIF_FLAG_ETHARP) {
0491     etharp_gratuitous(netif);
0492   }
0493 #endif /* LWIP_ARP */
0494 
0495 #if LWIP_IGMP
0496     /* resend IGMP memberships */
0497     if (netif->flags & NETIF_FLAG_IGMP) {
0498       igmp_report_groups( netif);
0499     }
0500 #endif /* LWIP_IGMP */
0501   }
0502   NETIF_LINK_CALLBACK(netif);
0503 }
0504 
0505 /**
0506  * Called by a driver when its link goes down
0507  */
0508 void netif_set_link_down(struct netif *netif )
0509 {
0510   netif->flags &= ~NETIF_FLAG_LINK_UP;
0511   NETIF_LINK_CALLBACK(netif);
0512 }
0513 
0514 /**
0515  * Ask if a link is up
0516  */ 
0517 u8_t netif_is_link_up(struct netif *netif)
0518 {
0519   return (netif->flags & NETIF_FLAG_LINK_UP) ? 1 : 0;
0520 }
0521 
0522 /**
0523  * Set callback to be called when link is brought up/down
0524  */
0525 void netif_set_link_callback(struct netif *netif, void (* link_callback)(struct netif *netif ))
0526 {
0527   if (netif) {
0528     netif->link_callback = link_callback;
0529   }
0530 }
0531 #endif /* LWIP_NETIF_LINK_CALLBACK */
0532 
0533 #if ENABLE_LOOPBACK
0534 /**
0535  * Send an IP packet to be received on the same netif (loopif-like).
0536  * The pbuf is simply copied and handed back to netif->input.
0537  * In multithreaded mode, this is done directly since netif->input must put
0538  * the packet on a queue.
0539  * In callback mode, the packet is put on an internal queue and is fed to
0540  * netif->input by netif_poll().
0541  *
0542  * @param netif the lwip network interface structure
0543  * @param p the (IP) packet to 'send'
0544  * @param ipaddr the ip address to send the packet to (not used)
0545  * @return ERR_OK if the packet has been sent
0546  *         ERR_MEM if the pbuf used to copy the packet couldn't be allocated
0547  */
0548 err_t
0549 netif_loop_output(struct netif *netif, struct pbuf *p,
0550        struct ip_addr *ipaddr)
0551 {
0552   struct pbuf *r;
0553   err_t err;
0554   struct pbuf *last;
0555 #if LWIP_LOOPBACK_MAX_PBUFS
0556   u8_t clen = 0;
0557 #endif /* LWIP_LOOPBACK_MAX_PBUFS */
0558   SYS_ARCH_DECL_PROTECT(lev);
0559   LWIP_UNUSED_ARG(ipaddr);
0560 
0561   /* Allocate a new pbuf */
0562   r = pbuf_alloc(PBUF_LINK, p->tot_len, PBUF_RAM);
0563   if (r == NULL) {
0564     return ERR_MEM;
0565   }
0566 #if LWIP_LOOPBACK_MAX_PBUFS
0567   clen = pbuf_clen(r);
0568   /* check for overflow or too many pbuf on queue */
0569   if(((netif->loop_cnt_current + clen) < netif->loop_cnt_current) ||
0570     ((netif->loop_cnt_current + clen) > LWIP_LOOPBACK_MAX_PBUFS)) {
0571       pbuf_free(r);
0572       r = NULL;
0573       return ERR_MEM;
0574   }
0575   netif->loop_cnt_current += clen;
0576 #endif /* LWIP_LOOPBACK_MAX_PBUFS */
0577 
0578   /* Copy the whole pbuf queue p into the single pbuf r */
0579   if ((err = pbuf_copy(r, p)) != ERR_OK) {
0580     pbuf_free(r);
0581     r = NULL;
0582     return err;
0583   }
0584 
0585   /* Put the packet on a linked list which gets emptied through calling
0586      netif_poll(). */
0587 
0588   /* let last point to the last pbuf in chain r */
0589   for (last = r; last->next != NULL; last = last->next);
0590 
0591   SYS_ARCH_PROTECT(lev);
0592   if(netif->loop_first != NULL) {
0593     LWIP_ASSERT("if first != NULL, last must also be != NULL", netif->loop_last != NULL);
0594     netif->loop_last->next = r;
0595     netif->loop_last = last;
0596   } else {
0597     netif->loop_first = r;
0598     netif->loop_last = last;
0599   }
0600   SYS_ARCH_UNPROTECT(lev);
0601 
0602 #if LWIP_NETIF_LOOPBACK_MULTITHREADING
0603   /* For multithreading environment, schedule a call to netif_poll */
0604   tcpip_callback((void (*)(void *))(netif_poll), netif);
0605 #endif /* LWIP_NETIF_LOOPBACK_MULTITHREADING */
0606 
0607   return ERR_OK;
0608 }
0609 
0610 /**
0611  * Call netif_poll() in the main loop of your application. This is to prevent
0612  * reentering non-reentrant functions like tcp_input(). Packets passed to
0613  * netif_loop_output() are put on a list that is passed to netif->input() by
0614  * netif_poll().
0615  */
0616 void
0617 netif_poll(struct netif *netif)
0618 {
0619   struct pbuf *in;
0620   SYS_ARCH_DECL_PROTECT(lev);
0621 
0622   do {
0623     /* Get a packet from the list. With SYS_LIGHTWEIGHT_PROT=1, this is protected */
0624     SYS_ARCH_PROTECT(lev);
0625     in = netif->loop_first;
0626     if(in != NULL) {
0627       struct pbuf *in_end = in;
0628 #if LWIP_LOOPBACK_MAX_PBUFS
0629       u8_t clen = pbuf_clen(in);
0630       /* adjust the number of pbufs on queue */
0631       LWIP_ASSERT("netif->loop_cnt_current underflow",
0632         ((netif->loop_cnt_current - clen) < netif->loop_cnt_current));
0633       netif->loop_cnt_current -= clen;
0634 #endif /* LWIP_LOOPBACK_MAX_PBUFS */
0635       while(in_end->len != in_end->tot_len) {
0636         LWIP_ASSERT("bogus pbuf: len != tot_len but next == NULL!", in_end->next != NULL);
0637         in_end = in_end->next;
0638       }
0639       /* 'in_end' now points to the last pbuf from 'in' */
0640       if(in_end == netif->loop_last) {
0641         /* this was the last pbuf in the list */
0642         netif->loop_first = netif->loop_last = NULL;
0643       } else {
0644         /* pop the pbuf off the list */
0645         netif->loop_first = in_end->next;
0646         LWIP_ASSERT("should not be null since first != last!", netif->loop_first != NULL);
0647       }
0648       /* De-queue the pbuf from its successors on the 'loop_' list. */
0649       in_end->next = NULL;
0650     }
0651     SYS_ARCH_UNPROTECT(lev);
0652 
0653     if(in != NULL) {
0654       /* loopback packets are always IP packets! */
0655       if(ip_input(in, netif) != ERR_OK) {
0656         pbuf_free(in);
0657       }
0658       /* Don't reference the packet any more! */
0659       in = NULL;
0660     }
0661   /* go on while there is a packet on the list */
0662   } while(netif->loop_first != NULL);
0663 }
0664 
0665 #if !LWIP_NETIF_LOOPBACK_MULTITHREADING
0666 /**
0667  * Calls netif_poll() for every netif on the netif_list.
0668  */
0669 void
0670 netif_poll_all(void)
0671 {
0672   struct netif *netif = netif_list;
0673   /* loop through netifs */
0674   while (netif != NULL) {
0675     netif_poll(netif);
0676     /* proceed to next network interface */
0677     netif = netif->next;
0678   }
0679 }
0680 #endif /* !LWIP_NETIF_LOOPBACK_MULTITHREADING */
0681 #endif /* ENABLE_LOOPBACK */
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