pktif.c

NXPl788上lwip的无操作系统移植,基于Embest开发板

    LINK_STATS_INC(link.drop);
    snmp_inc_ifoutdiscards(netif);
    return ERR_BUF;
  }

  LINK_STATS_INC(link.xmit);
  snmp_add_ifoutoctets(netif, tot_len);
  ethhdr = (struct eth_hdr *)p->payload;
  if ((ethhdr->dest.addr[0] & 1) != 0) {
    /* broadcast or multicast packet*/
    snmp_inc_ifoutnucastpkts(netif);
  } else {
    /* unicast packet */
    snmp_inc_ifoutucastpkts(netif);
  }
  return ERR_OK;
}

/*-----------------------------------------------------------------------------------*/
/*
 * low_level_input():
 *
 * Should allocate a pbuf and transfer the bytes of the incoming
 * packet from the interface into the pbuf.
 *
 */
/*-----------------------------------------------------------------------------------*/
static struct pbuf *
low_level_input(struct netif *netif, void *packet, int packet_len)
{
  struct pbuf *p, *q;
  int start;
  int length = packet_len;
  struct eth_addr *dest = (struct eth_addr*)packet;
  struct eth_addr *src = dest + 1;
  int unicast;

  /* MAC filter: only let my MAC or non-unicast through */
  unicast = ((dest->addr[0] & 0x01) == 0);
  if (((memcmp(dest, &netif->hwaddr, ETHARP_HWADDR_LEN)) && unicast) ||
      /* and don't let feedback packets through (limitation in winpcap?) */
      (!memcmp(src, netif->hwaddr, ETHARP_HWADDR_LEN))) {
    /* don't update counters here! */
    return NULL;
  }

  /* We allocate a pbuf chain of pbufs from the pool. */
  p = pbuf_alloc(PBUF_RAW, (u16_t)length + ETH_PAD_SIZE, PBUF_POOL);
  LWIP_DEBUGF(NETIF_DEBUG, ("netif: recv length %i p->tot_len %i\n", length, (int)p->tot_len));
  
  if (p != NULL) {
    /* We iterate over the pbuf chain until we have read the entire
       packet into the pbuf. */
    start=0;
    for (q = p; q != NULL; q = q->next) {
      u16_t copy_len = q->len;
      /* Read enough bytes to fill this pbuf in the chain. The
         available data in the pbuf is given by the q->len
         variable. */
      /* read data into(q->payload, q->len); */
      LWIP_DEBUGF(NETIF_DEBUG, ("netif: recv start %i length %i q->payload %p q->len %i q->next %p\n", start, length, q->payload, (int)q->len, q->next));
      if (q == p) {
        LWIP_ASSERT("q->len >= ETH_PAD_SIZE", q->len >= ETH_PAD_SIZE);
        copy_len -= ETH_PAD_SIZE;
        memcpy(&((char*)q->payload)[ETH_PAD_SIZE], &((char*)packet)[start], copy_len);
      } else {
        memcpy(q->payload, &((char*)packet)[start], copy_len);
      }
      start += copy_len;
      length -= copy_len;
      if (length <= 0) {
        break;
      }
    }
    LINK_STATS_INC(link.recv);
    snmp_add_ifinoctets(netif, p->tot_len);
    if (unicast) {
      snmp_inc_ifinucastpkts(netif);
    } else {
      snmp_inc_ifinnucastpkts(netif);
    }
  } else {
    /* drop packet(); */
    LINK_STATS_INC(link.memerr);
    LINK_STATS_INC(link.drop);
  }

  return p;
}

/*-----------------------------------------------------------------------------------*/
/*
 * ethernetif_input():
 *
 * This function should be called when a packet is ready to be read
 * from the interface. It uses the function low_level_input() that
 * should handle the actual reception of bytes from the network
 * interface.
 *
 */
/*-----------------------------------------------------------------------------------*/
static void
ethernetif_input(struct netif *netif, void *packet, int packet_len)
{
  struct eth_hdr *ethhdr;
  struct pbuf *p;

  if (packet_len <= 0) {
    return;
  }
  /* move received packet into a new pbuf */
  p = low_level_input(netif, packet, packet_len);
  /* no packet could be read, silently ignore this */
  if (p == NULL) {
    return;
  }

  /* points to packet payload, which starts with an Ethernet header */
  ethhdr = (struct eth_hdr *)p->payload;
  switch (htons(ethhdr->type)) {
  /* IP or ARP packet? */
  case ETHTYPE_IP:
  case ETHTYPE_ARP:
#if PPPOE_SUPPORT
  /* PPPoE packet? */
  case ETHTYPE_PPPOEDISC:
  case ETHTYPE_PPPOE:
#endif /* PPPOE_SUPPORT */
    /* full packet send to tcpip_thread to process */
    if (netif->input(p, netif) != ERR_OK) {
      LWIP_DEBUGF(NETIF_DEBUG, ("ethernetif_input: IP input error\n"));
      pbuf_free(p);
      p = NULL;
    }
    break;

  default:
    LINK_STATS_INC(link.proterr);
    LINK_STATS_INC(link.drop);
    pbuf_free(p);
    p = NULL;
    break;
  }
}

/*-----------------------------------------------------------------------------------*/
/*
 * ethernetif_init():
 *
 * Should be called at the beginning of the program to set up the
 * network interface. It calls the function low_level_init() to do the
 * actual setup of the hardware.
 *
 */
/*-----------------------------------------------------------------------------------*/
err_t
ethernetif_init(struct netif *netif)
{
  static int ethernetif_index;

  int local_index;
  SYS_ARCH_DECL_PROTECT(lev);
  SYS_ARCH_PROTECT(lev);
  local_index = ethernetif_index++;
  SYS_ARCH_UNPROTECT(lev);

  netif->name[0] = IFNAME0;
  netif->name[1] = (char)(IFNAME1 + local_index);
  netif->linkoutput = low_level_output;
#if LWIP_ARP
  netif->output = etharp_output;
#else /* LWIP_ARP */
  netif->output = NULL; /* not used for PPPoE */
#endif /* LWIP_ARP */
#if LWIP_NETIF_HOSTNAME
  /* Initialize interface hostname */
  netif_set_hostname(netif, "lwip");
#endif /* LWIP_NETIF_HOSTNAME */

  netif->mtu = 1500;
  netif->flags = NETIF_FLAG_BROADCAST | NETIF_FLAG_ETHARP | NETIF_FLAG_IGMP;
  netif->hwaddr_len = ETHARP_HWADDR_LEN;

  NETIF_INIT_SNMP(netif, snmp_ifType_ethernet_csmacd, 100000000);

  /* sets link up or down based on current status */
  low_level_init(netif);
  
  return ERR_OK;
}

void
ethernetif_shutdown(struct netif *netif)
{
  shutdown_adapter(netif->state);
}

void
ethernetif_poll(struct netif *netif)
{
  update_adapter(netif->state);

  /* Process the link status change */
  switch (link_adapter(netif->state)) {
    case LINKEVENT_UP: {
      NOTIFY_LINKSTATE(netif,netif_set_link_up);
      break;
    }
    case LINKEVENT_DOWN: {
      NOTIFY_LINKSTATE(netif,netif_set_link_down);
      break;
    }
  }
}

/*-----------------------------------------------------------------------------------*/
/*
 * pktif_update():
 *
 * Needs to be called periodically to get new packets. This could
 * be done inside a thread.
 */
/*-----------------------------------------------------------------------------------*/
void
ethernetif_process_input(void *arg, void *packet, int packet_len)
{
  struct netif *netif = (struct netif*)arg;
  ethernetif_input(netif, packet, packet_len);
}

#endif /* LWIP_ETHERNET */