/**
* @file
*
* lwIP network interface abstraction
*/
#include "netif.h"
#include "tcp.h"
struct netif *netif_list = NULL;
struct netif *netif_default = NULL;
/**
* 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, Uint32 *ipaddr, Uint32 *netmask,
Uint32 *gw,
void *state,
err_t (* init)(struct netif *netif),
err_t (* input)(struct pbuf *p, struct netif *netif)
)
{
static int netifnum = 0;
#if LWIP_DHCP
/* netif not under DHCP control by default */
netif->dhcp = NULL;
#endif
/* remember netif specific state information data */
netif->state = state;
netif->num = netifnum++;
netif->input = input;
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;
// 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;
}
void
netif_set_addr(struct netif *netif,Uint32 *ipaddr, Uint32 *netmask,
Uint32 *gw)
{
netif_set_ipaddr(netif, ipaddr);
netif_set_netmask(netif, netmask);
netif_set_gw(netif, gw);
}
void netif_remove(struct netif * netif)
{
if ( netif == NULL ) return;
/* 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 */
}
/* this netif is default? */
if (netif_default == netif)
/* reset default netif */
netif_default = NULL;
// LWIP_DEBUGF( NETIF_DEBUG, ("netif_remove: removed netif\n") );
}
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;
}
void
netif_set_ipaddr(struct netif *netif, Uint32 *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 ((ip_addr_cmp(ipaddr, &(netif->ip_addr))) == 0)
{
/* extern struct tcp_pcb *tcp_active_pcbs; defined by tcp.h */
LWIP_DEBUGF(NETIF_DEBUG | 1, ("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))) {
/* this connection must be aborted */
struct tcp_pcb *next = pcb->next;
LWIP_DEBUGF(NETIF_DEBUG | 1, ("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_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
ip_addr_set((struct ip_addr *)&(netif->ip_addr), (struct ip_addr *)ipaddr);
#if 0 /* only allowed for Ethernet interfaces TODO: how can we check? */
/** For Ethernet network interfaces, we would like to send a
* "gratuitous ARP"; this is an ARP packet sent by a node in order
* to spontaneously cause other nodes to update an entry in their
* ARP cache. From RFC 3220 "IP Mobility Support for IPv4" section 4.6.
*/
etharp_query(netif, ipaddr, NULL);
#endif
// LWIP_DEBUGF(NETIF_DEBUG | DBG_TRACE | DBG_STATE | 3, ("netif: IP address of interface %c%c set to %u.%u.%u.%u\n",
// netif->name[0], netif->name[1],
// ip4_addr1(&netif->ip_addr),
// ip4_addr2(&netif->ip_addr),
// ip4_addr3(&netif->ip_addr),
// ip4_addr4(&netif->ip_addr)));
}
void
netif_set_gw(struct netif *netif, Uint32 *gw)
{
ip_addr_set((struct ip_addr *)&(netif->gw),(struct ip_addr *) gw);
// LWIP_DEBUGF(NETIF_DEBUG | DBG_TRACE | DBG_STATE | 3, ("netif: GW address of interface %c%c set to %u.%u.%u.%u\n",
// netif->name[0], netif->name[1],
// ip4_addr1(&netif->gw),
// ip4_addr2(&netif->gw),
// ip4_addr3(&netif->gw),
// ip4_addr4(&netif->gw)));
}
void
netif_set_netmask(struct netif *netif, Uint32 *netmask)
{
ip_addr_set((struct ip_addr *)&(netif->netmask), (struct ip_addr *)netmask);
// LWIP_DEBUGF(NETIF_DEBUG | DBG_TRACE | DBG_STATE | 3, ("netif: netmask of interface %c%c set to %u.%u.%u.%u\n",
// netif->name[0], netif->name[1],
// ip4_addr1(&netif->netmask),
// ip4_addr2(&netif->netmask),
// ip4_addr3(&netif->netmask),
// ip4_addr4(&netif->netmask)));
}
void
netif_set_default(struct netif *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)
{
netif->flags |= NETIF_FLAG_UP;
}
/**
* Ask if an interface is up
*/
u8_t netif_is_up(struct netif *netif)
{
return (netif->flags & NETIF_FLAG_UP)?1:0;
}
/**
* 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)
{
netif->flags &= ~NETIF_FLAG_UP;
}
void netif_init(void)
{
netif_list = netif_default = NULL;
}
/*
err_t (* input)(struct pbuf *p, struct netif *inp)
{
return NULL;
}
err_t (* output)(struct netif *netif, struct pbuf *p,Uint32 *ipaddr)
{
return NULL;
}
err_t (* linkoutput)(struct netif *netif, struct pbuf *p)
{
return NULL;
}*/
