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Checked in slightly modified version of patch # 6370: Moved loopif code to netif.c so that loopback traffic is supported on all netifs (all local IPs).

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This commit is contained in:
goldsimon
2008-06-12 20:10:08 +00:00
parent 24e0b25215
commit 88ff8c83e9
7 changed files with 202 additions and 172 deletions
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153
src/netif/loopif.c
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@@ -40,149 +40,8 @@
#if LWIP_HAVE_LOOPIF
#include "netif/loopif.h"
#include "lwip/pbuf.h"
#include "lwip/snmp.h"
#include <string.h>
#if !LWIP_LOOPIF_MULTITHREADING
#include "lwip/sys.h"
#include "lwip/mem.h"
/* helper struct for the linked list of pbufs */
struct loopif_private {
struct pbuf *first;
struct pbuf *last;
};
/**
* Call loopif_poll() in the main loop of your application. This is to prevent
* reentering non-reentrant functions like tcp_input(). Packets passed to
* loopif_output() are put on a list that is passed to netif->input() by
* loopif_poll().
*
* @param netif the lwip network interface structure for this loopif
*/
void
loopif_poll(struct netif *netif)
{
SYS_ARCH_DECL_PROTECT(lev);
struct pbuf *in, *in_end;
struct loopif_private *priv = (struct loopif_private*)netif->state;
LWIP_ERROR("priv != NULL", (priv != NULL), return;);
do {
/* Get a packet from the list. With SYS_LIGHTWEIGHT_PROT=1, this is protected */
SYS_ARCH_PROTECT(lev);
in = priv->first;
if(in) {
in_end = in;
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 == priv->last) {
/* this was the last pbuf in the list */
priv->first = priv->last = NULL;
} else {
/* pop the pbuf off the list */
priv->first = in_end->next;
LWIP_ASSERT("should not be null since first != last!", priv->first != NULL);
}
}
SYS_ARCH_UNPROTECT(lev);
if(in != NULL) {
if(in_end->next != NULL) {
/* De-queue the pbuf from its successors on the 'priv' list. */
in_end->next = NULL;
}
if(netif->input(in, netif) != ERR_OK) {
pbuf_free(in);
}
/* Don't reference the packet any more! */
in = NULL;
in_end = NULL;
}
/* go on while there is a packet on the list */
} while(priv->first != NULL);
}
#endif /* LWIP_LOOPIF_MULTITHREADING */
/**
* Send an IP packet over the loopback interface.
* 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 loopif_poll().
*
* @param netif the lwip network interface structure for this loopif
* @param p the (IP) packet to 'send'
* @param ipaddr the ip address to send the packet to (not used for loopif)
* @return ERR_OK if the packet has been sent
* ERR_MEM if the pbuf used to copy the packet couldn't be allocated
*/
static err_t
loopif_output(struct netif *netif, struct pbuf *p,
struct ip_addr *ipaddr)
{
#if !LWIP_LOOPIF_MULTITHREADING
SYS_ARCH_DECL_PROTECT(lev);
struct loopif_private *priv;
struct pbuf *last;
#endif /* LWIP_LOOPIF_MULTITHREADING */
struct pbuf *r;
err_t err;
LWIP_UNUSED_ARG(ipaddr);
/* Allocate a new pbuf */
r = pbuf_alloc(PBUF_RAW, p->tot_len, PBUF_RAM);
if (r == NULL) {
return ERR_MEM;
}
/* Copy the whole pbuf queue p into the single pbuf r */
if ((err = pbuf_copy(r, p)) != ERR_OK) {
pbuf_free(r);
r = NULL;
return err;
}
#if LWIP_LOOPIF_MULTITHREADING
/* Multithreading environment, netif->input() is supposed to put the packet
into a mailbox, so we can safely call it here without risking to re-enter
functions that are not reentrant (TCP!!!) */
if(netif->input(r, netif) != ERR_OK) {
pbuf_free(r);
r = NULL;
}
#else /* LWIP_LOOPIF_MULTITHREADING */
/* Raw API without threads: put the packet on a linked list which gets emptied
through calling loopif_poll(). */
priv = (struct loopif_private*)netif->state;
/* let last point to the last pbuf in chain r */
for (last = r; last->next != NULL; last = last->next);
SYS_ARCH_PROTECT(lev);
if(priv->first != NULL) {
LWIP_ASSERT("if first != NULL, last must also be != NULL", priv->last != NULL);
priv->last->next = r;
priv->last = last;
} else {
priv->first = r;
priv->last = last;
}
SYS_ARCH_UNPROTECT(lev);
#endif /* LWIP_LOOPIF_MULTITHREADING */
return ERR_OK;
}
/**
* Initialize a lwip network interface structure for a loopback interface
*
@@ -193,16 +52,6 @@ loopif_output(struct netif *netif, struct pbuf *p,
err_t
loopif_init(struct netif *netif)
{
#if !LWIP_LOOPIF_MULTITHREADING
struct loopif_private *priv;
priv = (struct loopif_private*)mem_malloc(sizeof(struct loopif_private));
if(priv == NULL)
return ERR_MEM;
priv->first = priv->last = NULL;
netif->state = priv;
#endif /* LWIP_LOOPIF_MULTITHREADING */
/* initialize the snmp variables and counters inside the struct netif
* ifSpeed: no assumption can be made!
*/
@@ -210,7 +59,7 @@ loopif_init(struct netif *netif)
netif->name[0] = 'l';
netif->name[1] = 'o';
netif->output = loopif_output;
netif->output = netif_loop_output;
return ERR_OK;
}