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nodemcu-firmware/app/lwip/core/netif.c

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/**
* @file
* lwIP network interface abstraction
*
*/
/*
* Copyright (c) 2001-2004 Swedish Institute of Computer Science.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
* SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* 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>
*
*/
#include "lwip/opt.h"
#include "lwip/def.h"
#include "lwip/ip_addr.h"
#include "lwip/netif.h"
#include "lwip/tcp_impl.h"
#include "lwip/snmp.h"
#include "lwip/igmp.h"
#include "netif/etharp.h"
#include "lwip/stats.h"
#if ENABLE_LOOPBACK
#include "lwip/sys.h"
#if LWIP_NETIF_LOOPBACK_MULTITHREADING
#include "lwip/tcpip.h"
#endif /* LWIP_NETIF_LOOPBACK_MULTITHREADING */
#endif /* ENABLE_LOOPBACK */
#if LWIP_AUTOIP
#include "lwip/autoip.h"
#endif /* LWIP_AUTOIP */
#if LWIP_DHCP
#include "lwip/dhcp.h"
#endif /* LWIP_DHCP */
#if LWIP_NETIF_STATUS_CALLBACK
#define NETIF_STATUS_CALLBACK(n) do{ if (n->status_callback) { (n->status_callback)(n); }}while(0)
#else
#define NETIF_STATUS_CALLBACK(n)
#endif /* LWIP_NETIF_STATUS_CALLBACK */
#if LWIP_NETIF_LINK_CALLBACK
#define NETIF_LINK_CALLBACK(n) do{ if (n->link_callback) { (n->link_callback)(n); }}while(0)
#else
#define NETIF_LINK_CALLBACK(n)
#endif /* LWIP_NETIF_LINK_CALLBACK */
struct netif *netif_list;
struct netif *netif_default;
#if LWIP_HAVE_LOOPIF
static struct netif loop_netif;
/**
* Initialize a lwip network interface structure for a loopback interface
*
* @param netif the lwip network interface structure for this loopif
* @return ERR_OK if the loopif is initialized
* ERR_MEM if private data couldn't be allocated
*/
static err_t ICACHE_FLASH_ATTR
netif_loopif_init(struct netif *netif)
{
/* initialize the snmp variables and counters inside the struct netif
* ifSpeed: no assumption can be made!
*/
NETIF_INIT_SNMP(netif, snmp_ifType_softwareLoopback, 0);
netif->name[0] = 'l';
netif->name[1] = 'o';
netif->output = netif_loop_output;
return ERR_OK;
}
#endif /* LWIP_HAVE_LOOPIF */
void
netif_init(void)
{
#if LWIP_HAVE_LOOPIF
ip_addr_t loop_ipaddr, loop_netmask, loop_gw;
IP4_ADDR(&loop_gw, 127,0,0,1);
IP4_ADDR(&loop_ipaddr, 127,0,0,1);
IP4_ADDR(&loop_netmask, 255,0,0,0);
#if NO_SYS
netif_add(&loop_netif, &loop_ipaddr, &loop_netmask, &loop_gw, NULL, netif_loopif_init, ip_input);
#else /* NO_SYS */
netif_add(&loop_netif, &loop_ipaddr, &loop_netmask, &loop_gw, NULL, netif_loopif_init, tcpip_input);
#endif /* NO_SYS */
netif_set_up(&loop_netif);
#endif /* LWIP_HAVE_LOOPIF */
}
/**
* Add a network interface to the list of lwIP netifs.
*
* @param netif a pre-allocated netif structure
* @param ipaddr IP address for the new netif
* @param netmask network mask for the new netif
* @param gw default gateway IP address for the new netif
* @param state opaque data passed to the new netif
* @param init callback function that initializes the interface
* @param input callback function that is called to pass
* ingress packets up in the protocol layer stack.
*
* @return netif, or NULL if failed.
*/
struct netif *
netif_add(struct netif *netif, ip_addr_t *ipaddr, ip_addr_t *netmask,
ip_addr_t *gw, void *state, netif_init_fn init, netif_input_fn input)
{
static u8_t netifnum = 0;
LWIP_ASSERT("No init function given", init != NULL);
/* reset new interface configuration state */
ip_addr_set_zero(&netif->ip_addr);
ip_addr_set_zero(&netif->netmask);
ip_addr_set_zero(&netif->gw);
netif->flags = 0;
#if LWIP_DHCP
/* netif not under DHCP control by default */
netif->dhcp = NULL;
netif->dhcps_pcb = NULL;
#endif /* LWIP_DHCP */
#if LWIP_AUTOIP
/* netif not under AutoIP control by default */
netif->autoip = NULL;
#endif /* LWIP_AUTOIP */
#if LWIP_NETIF_STATUS_CALLBACK
netif->status_callback = NULL;
#endif /* LWIP_NETIF_STATUS_CALLBACK */
#if LWIP_NETIF_LINK_CALLBACK
netif->link_callback = NULL;
#endif /* LWIP_NETIF_LINK_CALLBACK */
#if LWIP_IGMP
netif->igmp_mac_filter = NULL;
#endif /* LWIP_IGMP */
#if ENABLE_LOOPBACK
netif->loop_first = NULL;
netif->loop_last = NULL;
#endif /* ENABLE_LOOPBACK */
/* remember netif specific state information data */
netif->state = state;
netif->num = netifnum++;
netif->input = input;
#if LWIP_NETIF_HWADDRHINT
netif->addr_hint = NULL;
#endif /* LWIP_NETIF_HWADDRHINT*/
#if ENABLE_LOOPBACK && LWIP_LOOPBACK_MAX_PBUFS
netif->loop_cnt_current = 0;
#endif /* ENABLE_LOOPBACK && LWIP_LOOPBACK_MAX_PBUFS */
netif_set_addr(netif, ipaddr, netmask, gw);
/* call user specified initialization function for netif */
if (init(netif) != ERR_OK) {
return NULL;
}
/* add this netif to the list */
netif->next = netif_list;
netif_list = netif;
snmp_inc_iflist();
#if LWIP_IGMP
/* start IGMP processing */
if (netif->flags & NETIF_FLAG_IGMP) {
igmp_start(netif);
}
#endif /* LWIP_IGMP */
LWIP_DEBUGF(NETIF_DEBUG, ("netif: added interface %c%c IP addr ",
netif->name[0], netif->name[1]));
ip_addr_debug_print(NETIF_DEBUG, ipaddr);
LWIP_DEBUGF(NETIF_DEBUG, (" netmask "));
ip_addr_debug_print(NETIF_DEBUG, netmask);
LWIP_DEBUGF(NETIF_DEBUG, (" gw "));
ip_addr_debug_print(NETIF_DEBUG, gw);
LWIP_DEBUGF(NETIF_DEBUG, ("\n"));
return netif;
}
/**
* Change IP address configuration for a network interface (including netmask
* and default gateway).
*
* @param netif the network interface to change
* @param ipaddr the new IP address
* @param netmask the new netmask
* @param gw the new default gateway
*/
void
netif_set_addr(struct netif *netif, ip_addr_t *ipaddr, ip_addr_t *netmask,
ip_addr_t *gw)
{
netif_set_ipaddr(netif, ipaddr);
netif_set_netmask(netif, netmask);
netif_set_gw(netif, gw);
}
/**
* Remove a network interface from the list of lwIP netifs.
*
* @param netif the network interface to remove
*/
void
netif_remove(struct netif *netif)
{
if (netif == NULL) {
return;
}
#if LWIP_IGMP
/* stop IGMP processing */
if (netif->flags & NETIF_FLAG_IGMP) {
igmp_stop(netif);
}
#endif /* LWIP_IGMP */
if (netif_is_up(netif)) {
/* set netif down before removing (call callback function) */
netif_set_down(netif);
}
snmp_delete_ipaddridx_tree(netif);
/* is it the first netif? */
if (netif_list == netif) {
netif_list = netif->next;
} else {
/* look for netif further down the list */
struct netif * tmpNetif;
for (tmpNetif = netif_list; tmpNetif != NULL; tmpNetif = tmpNetif->next) {
if (tmpNetif->next == netif) {
tmpNetif->next = netif->next;
break;
}
}
if (tmpNetif == NULL)
return; /* we didn't find any netif today */
}
snmp_dec_iflist();
/* this netif is default? */
if (netif_default == netif) {
/* reset default netif */
netif_set_default(NULL);
}
LWIP_DEBUGF( NETIF_DEBUG, ("netif_remove: removed netif\n") );
}
/**
* Find a network interface by searching for its name
*
* @param name the name of the netif (like netif->name) plus concatenated number
* in ascii representation (e.g. 'en0')
*/
struct netif *
netif_find(char *name)
{
struct netif *netif;
u8_t num;
if (name == NULL) {
return NULL;
}
num = name[2] - '0';
for(netif = netif_list; netif != NULL; netif = netif->next) {
if (num == netif->num &&
name[0] == netif->name[0] &&
name[1] == netif->name[1]) {
LWIP_DEBUGF(NETIF_DEBUG, ("netif_find: found %c%c\n", name[0], name[1]));
return netif;
}
}
LWIP_DEBUGF(NETIF_DEBUG, ("netif_find: didn't find %c%c\n", name[0], name[1]));
return NULL;
}
/**
* Change the IP address of a network interface
*
* @param netif the network interface to change
* @param ipaddr the new IP address
*
* @note call netif_set_addr() if you also want to change netmask and
* default gateway
*/
void
netif_set_ipaddr(struct netif *netif, ip_addr_t *ipaddr)
{
/* TODO: Handling of obsolete pcbs */
/* See: http://mail.gnu.org/archive/html/lwip-users/2003-03/msg00118.html */
#if LWIP_TCP
struct tcp_pcb *pcb;
struct tcp_pcb_listen *lpcb;
/* address is actually being changed? */
if (ipaddr && (ip_addr_cmp(ipaddr, &(netif->ip_addr))) == 0) {
/* extern struct tcp_pcb *tcp_active_pcbs; defined by tcp.h */
LWIP_DEBUGF(NETIF_DEBUG | LWIP_DBG_STATE, ("netif_set_ipaddr: netif address being changed\n"));
pcb = tcp_active_pcbs;
while (pcb != NULL) {
/* PCB bound to current local interface address? */
if (ip_addr_cmp(&(pcb->local_ip), &(netif->ip_addr))
#if LWIP_AUTOIP
/* connections to link-local addresses must persist (RFC3927 ch. 1.9) */
&& !ip_addr_islinklocal(&(pcb->local_ip))
#endif /* LWIP_AUTOIP */
) {
/* this connection must be aborted */
struct tcp_pcb *next = pcb->next;
LWIP_DEBUGF(NETIF_DEBUG | LWIP_DBG_STATE, ("netif_set_ipaddr: aborting TCP pcb %p\n", (void *)pcb));
tcp_abort(pcb);
pcb = next;
} else {
pcb = pcb->next;
}
}
for (lpcb = tcp_listen_pcbs.listen_pcbs; lpcb != NULL; lpcb = lpcb->next) {
/* PCB bound to current local interface address? */
if ((!(ip_addr_isany(&(lpcb->local_ip)))) &&
(ip_addr_cmp(&(lpcb->local_ip), &(netif->ip_addr)))) {
/* The PCB is listening to the old ipaddr and
* is set to listen to the new one instead */
ip_addr_set(&(lpcb->local_ip), ipaddr);
}
}
}
#endif
snmp_delete_ipaddridx_tree(netif);
snmp_delete_iprteidx_tree(0,netif);
/* set new IP address to netif */
ip_addr_set(&(netif->ip_addr), ipaddr);
snmp_insert_ipaddridx_tree(netif);
snmp_insert_iprteidx_tree(0,netif);
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",
netif->name[0], netif->name[1],
ip4_addr1_16(&netif->ip_addr),
ip4_addr2_16(&netif->ip_addr),
ip4_addr3_16(&netif->ip_addr),
ip4_addr4_16(&netif->ip_addr)));
}
/**
* Change the default gateway for a network interface
*
* @param netif the network interface to change
* @param gw the new default gateway
*
* @note call netif_set_addr() if you also want to change ip address and netmask
*/
void
netif_set_gw(struct netif *netif, ip_addr_t *gw)
{
ip_addr_set(&(netif->gw), gw);
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",
netif->name[0], netif->name[1],
ip4_addr1_16(&netif->gw),
ip4_addr2_16(&netif->gw),
ip4_addr3_16(&netif->gw),
ip4_addr4_16(&netif->gw)));
}
/**
* Change the netmask of a network interface
*
* @param netif the network interface to change
* @param netmask the new netmask
*
* @note call netif_set_addr() if you also want to change ip address and
* default gateway
*/
void
netif_set_netmask(struct netif *netif, ip_addr_t *netmask)
{
snmp_delete_iprteidx_tree(0, netif);
/* set new netmask to netif */
ip_addr_set(&(netif->netmask), netmask);
snmp_insert_iprteidx_tree(0, netif);
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",
netif->name[0], netif->name[1],
ip4_addr1_16(&netif->netmask),
ip4_addr2_16(&netif->netmask),
ip4_addr3_16(&netif->netmask),
ip4_addr4_16(&netif->netmask)));
}
/**
* Set a network interface as the default network interface
* (used to output all packets for which no specific route is found)
*
* @param netif the default network interface
*/
void
netif_set_default(struct netif *netif)
{
if (netif == NULL) {
/* remove default route */
snmp_delete_iprteidx_tree(1, netif);
} else {
/* install default route */
snmp_insert_iprteidx_tree(1, netif);
}
netif_default = netif;
LWIP_DEBUGF(NETIF_DEBUG, ("netif: setting default interface %c%c\n",
netif ? netif->name[0] : '\'', netif ? netif->name[1] : '\''));
}
/**
* Bring an interface up, available for processing
* traffic.
*
* @note: Enabling DHCP on a down interface will make it come
* up once configured.
*
* @see dhcp_start()
*/
void netif_set_up(struct netif *netif)
{
if (!(netif->flags & NETIF_FLAG_UP)) {
netif->flags |= NETIF_FLAG_UP;
#if LWIP_SNMP
snmp_get_sysuptime(&netif->ts);
#endif /* LWIP_SNMP */
NETIF_STATUS_CALLBACK(netif);
if (netif->flags & NETIF_FLAG_LINK_UP) {
#if LWIP_ARP
/* For Ethernet network interfaces, we would like to send a "gratuitous ARP" */
if (netif->flags & (NETIF_FLAG_ETHARP)) {
etharp_gratuitous(netif);
}
#endif /* LWIP_ARP */
#if LWIP_IGMP
/* resend IGMP memberships */
if (netif->flags & NETIF_FLAG_IGMP) {
igmp_report_groups( netif);
}
#endif /* LWIP_IGMP */
}
}
}
/**
* Bring an interface down, disabling any traffic processing.
*
* @note: Enabling DHCP on a down interface will make it come
* up once configured.
*
* @see dhcp_start()
*/
void netif_set_down(struct netif *netif)
{
if (netif == NULL) {
return;
}
if (netif->flags & NETIF_FLAG_UP) {
netif->flags &= ~NETIF_FLAG_UP;
#if LWIP_SNMP
snmp_get_sysuptime(&netif->ts);
#endif
#if LWIP_ARP
if (netif->flags & NETIF_FLAG_ETHARP) {
etharp_cleanup_netif(netif);
}
#endif /* LWIP_ARP */
NETIF_STATUS_CALLBACK(netif);
}
}
#if LWIP_NETIF_STATUS_CALLBACK
/**
* Set callback to be called when interface is brought up/down
*/
void netif_set_status_callback(struct netif *netif, netif_status_callback_fn status_callback)
{
if (netif) {
netif->status_callback = status_callback;
}
}
#endif /* LWIP_NETIF_STATUS_CALLBACK */
/**
* Called by a driver when its link goes up
*/
void netif_set_link_up(struct netif *netif )
{
if (!(netif->flags & NETIF_FLAG_LINK_UP)) {
netif->flags |= NETIF_FLAG_LINK_UP;
#if LWIP_DHCP
if (netif->dhcp) {
dhcp_network_changed(netif);
}
#endif /* LWIP_DHCP */
#if LWIP_AUTOIP
if (netif->autoip) {
autoip_network_changed(netif);
}
#endif /* LWIP_AUTOIP */
if (netif->flags & NETIF_FLAG_UP) {
#if LWIP_ARP
/* For Ethernet network interfaces, we would like to send a "gratuitous ARP" */
if (netif->flags & NETIF_FLAG_ETHARP) {
etharp_gratuitous(netif);
}
#endif /* LWIP_ARP */
#if LWIP_IGMP
/* resend IGMP memberships */
if (netif->flags & NETIF_FLAG_IGMP) {
igmp_report_groups( netif);
}
#endif /* LWIP_IGMP */
}
NETIF_LINK_CALLBACK(netif);
}
}
/**
* Called by a driver when its link goes down
*/
void netif_set_link_down(struct netif *netif )
{
if (netif->flags & NETIF_FLAG_LINK_UP) {
netif->flags &= ~NETIF_FLAG_LINK_UP;
NETIF_LINK_CALLBACK(netif);
}
}
#if LWIP_NETIF_LINK_CALLBACK
/**
* Set callback to be called when link is brought up/down
*/
void netif_set_link_callback(struct netif *netif, netif_status_callback_fn link_callback)
{
if (netif) {
netif->link_callback = link_callback;
}
}
#endif /* LWIP_NETIF_LINK_CALLBACK */
#if ENABLE_LOOPBACK
/**
* Send an IP packet to be received on the same netif (loopif-like).
* The pbuf is simply copied and handed back to netif->input.
* In multithreaded mode, this is done directly since netif->input must put
* the packet on a queue.
* In callback mode, the packet is put on an internal queue and is fed to
* netif->input by netif_poll().
*
* @param netif the lwip network interface structure
* @param p the (IP) packet to 'send'
* @param ipaddr the ip address to send the packet to (not used)
* @return ERR_OK if the packet has been sent
* ERR_MEM if the pbuf used to copy the packet couldn't be allocated
*/
err_t
netif_loop_output(struct netif *netif, struct pbuf *p,
ip_addr_t *ipaddr)
{
struct pbuf *r;
err_t err;
struct pbuf *last;
#if LWIP_LOOPBACK_MAX_PBUFS
u8_t clen = 0;
#endif /* LWIP_LOOPBACK_MAX_PBUFS */
/* If we have a loopif, SNMP counters are adjusted for it,
* if not they are adjusted for 'netif'. */
#if LWIP_SNMP
#if LWIP_HAVE_LOOPIF
struct netif *stats_if = &loop_netif;
#else /* LWIP_HAVE_LOOPIF */
struct netif *stats_if = netif;
#endif /* LWIP_HAVE_LOOPIF */
#endif /* LWIP_SNMP */
SYS_ARCH_DECL_PROTECT(lev);
LWIP_UNUSED_ARG(ipaddr);
/* Allocate a new pbuf */
r = pbuf_alloc(PBUF_LINK, p->tot_len, PBUF_RAM);
if (r == NULL) {
LINK_STATS_INC(link.memerr);
LINK_STATS_INC(link.drop);
snmp_inc_ifoutdiscards(stats_if);
return ERR_MEM;
}
#if LWIP_LOOPBACK_MAX_PBUFS
clen = pbuf_clen(r);
/* check for overflow or too many pbuf on queue */
if(((netif->loop_cnt_current + clen) < netif->loop_cnt_current) ||
((netif->loop_cnt_current + clen) > LWIP_LOOPBACK_MAX_PBUFS)) {
pbuf_free(r);
LINK_STATS_INC(link.memerr);
LINK_STATS_INC(link.drop);
snmp_inc_ifoutdiscards(stats_if);
return ERR_MEM;
}
netif->loop_cnt_current += clen;
#endif /* LWIP_LOOPBACK_MAX_PBUFS */
/* Copy the whole pbuf queue p into the single pbuf r */
if ((err = pbuf_copy(r, p)) != ERR_OK) {
pbuf_free(r);
LINK_STATS_INC(link.memerr);
LINK_STATS_INC(link.drop);
snmp_inc_ifoutdiscards(stats_if);
return err;
}
/* Put the packet on a linked list which gets emptied through calling
netif_poll(). */
/* let last point to the last pbuf in chain r */
for (last = r; last->next != NULL; last = last->next);
SYS_ARCH_PROTECT(lev);
if(netif->loop_first != NULL) {
LWIP_ASSERT("if first != NULL, last must also be != NULL", netif->loop_last != NULL);
netif->loop_last->next = r;
netif->loop_last = last;
} else {
netif->loop_first = r;
netif->loop_last = last;
}
SYS_ARCH_UNPROTECT(lev);
LINK_STATS_INC(link.xmit);
snmp_add_ifoutoctets(stats_if, p->tot_len);
snmp_inc_ifoutucastpkts(stats_if);
#if LWIP_NETIF_LOOPBACK_MULTITHREADING
/* For multithreading environment, schedule a call to netif_poll */
tcpip_callback((tcpip_callback_fn)netif_poll, netif);
#endif /* LWIP_NETIF_LOOPBACK_MULTITHREADING */
return ERR_OK;
}
/**
* Call netif_poll() in the main loop of your application. This is to prevent
* reentering non-reentrant functions like tcp_input(). Packets passed to
* netif_loop_output() are put on a list that is passed to netif->input() by
* netif_poll().
*/
void
netif_poll(struct netif *netif)
{
struct pbuf *in;
/* If we have a loopif, SNMP counters are adjusted for it,
* if not they are adjusted for 'netif'. */
#if LWIP_SNMP
#if LWIP_HAVE_LOOPIF
struct netif *stats_if = &loop_netif;
#else /* LWIP_HAVE_LOOPIF */
struct netif *stats_if = netif;
#endif /* LWIP_HAVE_LOOPIF */
#endif /* LWIP_SNMP */
SYS_ARCH_DECL_PROTECT(lev);
do {
/* Get a packet from the list. With SYS_LIGHTWEIGHT_PROT=1, this is protected */
SYS_ARCH_PROTECT(lev);
in = netif->loop_first;
if (in != NULL) {
struct pbuf *in_end = in;
#if LWIP_LOOPBACK_MAX_PBUFS
u8_t clen = pbuf_clen(in);
/* adjust the number of pbufs on queue */
LWIP_ASSERT("netif->loop_cnt_current underflow",
((netif->loop_cnt_current - clen) < netif->loop_cnt_current));
netif->loop_cnt_current -= clen;
#endif /* LWIP_LOOPBACK_MAX_PBUFS */
while (in_end->len != in_end->tot_len) {
LWIP_ASSERT("bogus pbuf: len != tot_len but next == NULL!", in_end->next != NULL);
in_end = in_end->next;
}
/* 'in_end' now points to the last pbuf from 'in' */
if (in_end == netif->loop_last) {
/* this was the last pbuf in the list */
netif->loop_first = netif->loop_last = NULL;
} else {
/* pop the pbuf off the list */
netif->loop_first = in_end->next;
LWIP_ASSERT("should not be null since first != last!", netif->loop_first != NULL);
}
/* De-queue the pbuf from its successors on the 'loop_' list. */
in_end->next = NULL;
}
SYS_ARCH_UNPROTECT(lev);
if (in != NULL) {
LINK_STATS_INC(link.recv);
snmp_add_ifinoctets(stats_if, in->tot_len);
snmp_inc_ifinucastpkts(stats_if);
/* loopback packets are always IP packets! */
if (ip_input(in, netif) != ERR_OK) {
pbuf_free(in);
}
/* Don't reference the packet any more! */
in = NULL;
}
/* go on while there is a packet on the list */
} while (netif->loop_first != NULL);
}
#if !LWIP_NETIF_LOOPBACK_MULTITHREADING
/**
* Calls netif_poll() for every netif on the netif_list.
*/
void
netif_poll_all(void)
{
struct netif *netif = netif_list;
/* loop through netifs */
while (netif != NULL) {
netif_poll(netif);
/* proceed to next network interface */
netif = netif->next;
}
}
#endif /* !LWIP_NETIF_LOOPBACK_MULTITHREADING */
#endif /* ENABLE_LOOPBACK */
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