/**************************************************************************** * net/devif/devif_poll.c * * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. The * ASF licenses this file to you under the Apache License, Version 2.0 (the * "License"); you may not use this file except in compliance with the * License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the * License for the specific language governing permissions and limitations * under the License. * ****************************************************************************/ /**************************************************************************** * Included Files ****************************************************************************/ #include #ifdef CONFIG_NET #include #include #include #include #include #include "devif/devif.h" #include "netdev/netdev.h" #include "arp/arp.h" #include "can/can.h" #include "tcp/tcp.h" #include "udp/udp.h" #include "pkt/pkt.h" #include "bluetooth/bluetooth.h" #include "ieee802154/ieee802154.h" #include "icmp/icmp.h" #include "igmp/igmp.h" #include "icmpv6/icmpv6.h" #include "mld/mld.h" #include "ipforward/ipforward.h" #include "sixlowpan/sixlowpan.h" #include "ipfrag/ipfrag.h" /**************************************************************************** * Private Types ****************************************************************************/ enum devif_packet_type { DEVIF_PKT = 0, DEVIF_ICMP, DEVIF_IGMP, DEVIF_TCP, DEVIF_UDP, DEVIF_ICMP6 }; /**************************************************************************** * Private Functions ****************************************************************************/ /**************************************************************************** * Name: devif_packet_conversion * * Description: * Generic output conversion hook. Only needed for IEEE802.15.4 (and * other non-standard packet radios) for now but this is a point where * support for other conversions may be provided. * * TCP output comes through three different mechansims. Either from: * * 1. TCP socket output. For the case of TCP output to a radio, * the TCP output is caught in the socket send()/sendto() logic and * redirected to 6LoWPAN logic. * 2. TCP output from the TCP state machine. That will occur * during TCP packet processing by the TCP state meachine. * 3. TCP output resulting from TX or timer polling * * Cases 2 is handled here. Logic here detected if (1) an attempt * to return with d_len > 0 and (2) that the device is a radio * network driver. Under those conditions, 6LoWPAN logic will be called * to create the radio frames. * * All outgoing ICMPv6 messages come through one of two mechanisms: * * 1. The output from internal ICMPv6 message passing. These outgoing * messages will use device polling and will be handled here. * 2. ICMPv6 output resulting from TX or timer polling. * * Assumptions: * The network is locked. * ****************************************************************************/ #ifdef CONFIG_NET_6LOWPAN static void devif_packet_conversion(FAR struct net_driver_s *dev, enum devif_packet_type pkttype) { if (dev->d_len > 0) { /* Check if this is a device served by 6LoWPAN */ if (dev->d_lltype == NET_LL_IEEE802154 || dev->d_lltype == NET_LL_PKTRADIO) { FAR struct ipv6_hdr_s *ipv6 = (FAR struct ipv6_hdr_s *)dev->d_buf; #ifdef CONFIG_NET_IPv4 if ((ipv6->vtc & IP_VERSION_MASK) != IPv6_VERSION) { nerr("ERROR: IPv6 version error: %02x... Packet dropped\n", ipv6->vtc); } else #endif #ifdef CONFIG_NET_TCP if (pkttype == DEVIF_TCP) { /* This packet came from a response to TCP polling and is * directed to an radio driver using 6LoWPAN. Verify that the * outgoing packet is IPv6 with TCP protocol. */ if (ipv6->proto == IP_PROTO_TCP) { /* Let 6LoWPAN convert IPv6 TCP output into radio frames. */ sixlowpan_tcp_send(dev, dev, ipv6); } else { nerr("ERROR: TCP protocol error: %u... Packet dropped\n", ipv6->proto); } } else #endif #ifdef CONFIG_NET_ICMPv6 if (pkttype == DEVIF_ICMP6) { /* This packet came from a response to ICMPv6 polling and is * directed to a radio using 6LoWPAN. Verify that the outgoing * packet is IPv6 with TCP protocol. */ if (ipv6->proto == IP_PROTO_ICMP6) { /* Let 6LoWPAN convert IPv6 ICMPv6 output into radio * frames. */ sixlowpan_icmpv6_send(dev, dev, ipv6); } else { nerr("ERROR: ICMPv6 protocol error: %u..." " Packet dropped\n", ipv6->proto); } } else #endif { nerr("ERROR: Unhandled packet dropped." " pkttype=%u protocol=%u\n", pkttype, ipv6->proto); } UNUSED(ipv6); dev->d_len = 0; } } } #else # define devif_packet_conversion(dev,pkttype) #endif /* CONFIG_NET_6LOWPAN */ /**************************************************************************** * Name: devif_poll_pkt_connections * * Description: * Poll all packet connections for available packets to send. * * Assumptions: * This function is called from the MAC device driver with the network * locked. * ****************************************************************************/ #ifdef CONFIG_NET_PKT static int devif_poll_pkt_connections(FAR struct net_driver_s *dev, devif_poll_callback_t callback) { FAR struct pkt_conn_s *pkt_conn = NULL; int bstop = 0; /* Traverse all of the allocated packet connections and perform the poll * action. */ while (!bstop && (pkt_conn = pkt_nextconn(pkt_conn))) { /* Skip packet connections that are bound to other polling devices */ if (dev->d_ifindex == pkt_conn->ifindex) { /* Perform the packet TX poll */ pkt_poll(dev, pkt_conn); /* Perform any necessary conversions on outgoing packets */ devif_packet_conversion(dev, DEVIF_PKT); /* Call back into the driver */ if (dev->d_len > 0) { bstop = callback(dev); } } } return bstop; } #endif /* CONFIG_NET_PKT */ /**************************************************************************** * Name: devif_poll_can_connections * * Description: * Poll all packet connections for available packets to send. * * Assumptions: * This function is called from the MAC device driver with the network * locked. * ****************************************************************************/ #ifdef CONFIG_NET_CAN static int devif_poll_can_connections(FAR struct net_driver_s *dev, devif_poll_callback_t callback) { FAR struct can_conn_s *can_conn = NULL; int bstop = 0; /* Traverse all of the allocated packet connections and * perform the poll action */ while (!bstop && (can_conn = can_nextconn(can_conn))) { /* Skip connections that are bound to other polling devices */ if (dev == can_conn->dev) { /* Perform the packet TX poll */ can_poll(dev, can_conn); /* Call back into the driver */ bstop = callback(dev); } } return bstop; } #endif /* CONFIG_NET_PKT */ /**************************************************************************** * Name: devif_poll_bluetooth_connections * * Description: * Poll all packet connections for available packets to send. * * Assumptions: * This function is called from the MAC device driver with the network * locked. * ****************************************************************************/ #ifdef CONFIG_NET_BLUETOOTH static int devif_poll_bluetooth_connections(FAR struct net_driver_s *dev, devif_poll_callback_t callback) { FAR struct bluetooth_conn_s *bluetooth_conn = NULL; int bstop = 0; /* Traverse all of the allocated packet connections and perform the poll * action. */ while (!bstop && (bluetooth_conn = bluetooth_conn_next(bluetooth_conn))) { /* Perform the packet TX poll */ bluetooth_poll(dev, bluetooth_conn); /* Call back into the driver */ bstop = callback(dev); } return bstop; } #endif /* CONFIG_NET_BLUETOOTH */ /**************************************************************************** * Name: devif_poll_ieee802154_connections * * Description: * Poll all packet connections for available packets to send. * * Assumptions: * This function is called from the MAC device driver with the network * locked. * ****************************************************************************/ #ifdef CONFIG_NET_IEEE802154 static int devif_poll_ieee802154_connections(FAR struct net_driver_s *dev, devif_poll_callback_t callback) { FAR struct ieee802154_conn_s *ieee802154_conn = NULL; int bstop = 0; /* Traverse all of the allocated packet connections and perform the poll * action. */ while (!bstop && (ieee802154_conn = ieee802154_conn_next(ieee802154_conn))) { /* Perform the packet TX poll */ ieee802154_poll(dev, ieee802154_conn); /* Call back into the driver */ bstop = callback(dev); } return bstop; } #endif /* CONFIG_NET_IEEE802154 */ /**************************************************************************** * Name: devif_poll_icmp * * Description: * Poll all of the connections waiting to send an ICMP ECHO request * ****************************************************************************/ #if defined(CONFIG_NET_ICMP) && defined(CONFIG_NET_ICMP_SOCKET) static inline int devif_poll_icmp(FAR struct net_driver_s *dev, devif_poll_callback_t callback) { FAR struct icmp_conn_s *conn = NULL; int bstop = 0; /* Traverse all of the allocated ICMP connections and perform the poll * action. */ while (!bstop && (conn = icmp_nextconn(conn)) != NULL) { /* Skip ICMP connections that are bound to other polling devices */ if (dev == conn->dev) { /* Perform the ICMP poll */ icmp_poll(dev, conn); /* Perform any necessary conversions on outgoing packets */ devif_packet_conversion(dev, DEVIF_ICMP); /* Call back into the driver */ bstop = devif_poll_out(dev, callback); } } return bstop; } #endif /* CONFIG_NET_ICMP && CONFIG_NET_ICMP_SOCKET */ /**************************************************************************** * Name: devif_poll_icmpv6 * * Description: * Poll all of the connections waiting to send an ICMPv6 ECHO request * ****************************************************************************/ #if defined(CONFIG_NET_ICMPv6_SOCKET) || defined(CONFIG_NET_ICMPv6_NEIGHBOR) static inline int devif_poll_icmpv6(FAR struct net_driver_s *dev, devif_poll_callback_t callback) { FAR struct icmpv6_conn_s *conn = NULL; int bstop = 0; /* Traverse all of the allocated ICMPv6 connections and perform the poll * action. */ do { /* Skip ICMPv6 connections that are bound to other polling devices */ if (conn == NULL || dev == conn->dev) { /* Perform the ICMPV6 poll * Note: conn equal NULL in the first iteration means poll dev's * callback list since icmpv6_autoconfig and icmpv6_neighbor still * append it's callback into this list. */ icmpv6_poll(dev, conn); /* Perform any necessary conversions on outgoing packets */ devif_packet_conversion(dev, DEVIF_ICMP6); /* Call back into the driver */ bstop = devif_poll_out(dev, callback); } } while (!bstop && (conn = icmpv6_nextconn(conn)) != NULL); return bstop; } #endif /* CONFIG_NET_ICMPv6_SOCKET || CONFIG_NET_ICMPv6_NEIGHBOR*/ /**************************************************************************** * Name: devif_poll_forward * * Description: * Poll the device event to see if any task is waiting to forward a packet. * ****************************************************************************/ #ifdef CONFIG_NET_IPFORWARD static inline int devif_poll_forward(FAR struct net_driver_s *dev, devif_poll_callback_t callback) { /* Perform the forwarding poll */ ipfwd_poll(dev); /* NOTE: that 6LoWPAN packet conversions are handled differently for * forwarded packets. That is because we don't know what the packet * type is at this point; not within peeking into the device's d_buf. */ /* Call back into the driver */ return devif_poll_out(dev, callback); } #endif /* CONFIG_NET_ICMPv6_SOCKET || CONFIG_NET_ICMPv6_NEIGHBOR*/ /**************************************************************************** * Name: devif_poll_igmp * * Description: * Poll all IGMP connections for available packets to send. * * Assumptions: * This function is called from the MAC device driver with the network * locked. * ****************************************************************************/ #ifdef CONFIG_NET_IGMP static inline int devif_poll_igmp(FAR struct net_driver_s *dev, devif_poll_callback_t callback) { /* Perform the IGMP TX poll */ igmp_poll(dev); /* Perform any necessary conversions on outgoing packets */ devif_packet_conversion(dev, DEVIF_IGMP); /* Call back into the driver */ return devif_poll_out(dev, callback); } #endif /* CONFIG_NET_IGMP */ /**************************************************************************** * Name: devif_poll_mld * * Description: * Poll all MLD connections for available packets to send. * * Assumptions: * This function is called from the MAC device driver with the network * locked. * ****************************************************************************/ #ifdef CONFIG_NET_MLD static inline int devif_poll_mld(FAR struct net_driver_s *dev, devif_poll_callback_t callback) { /* Perform the MLD TX poll */ mld_poll(dev); /* Perform any necessary conversions on outgoing ICMPv6 packets */ devif_packet_conversion(dev, DEVIF_ICMP6); /* Call back into the driver */ return devif_poll_out(dev, callback); } #endif /* CONFIG_NET_MLD */ /**************************************************************************** * Name: devif_poll_udp_connections * * Description: * Poll all UDP connections for available packets to send. * * Assumptions: * This function is called from the MAC device driver with the network * locked. * ****************************************************************************/ #ifdef NET_UDP_HAVE_STACK static int devif_poll_udp_connections(FAR struct net_driver_s *dev, devif_poll_callback_t callback) { FAR struct udp_conn_s *conn = NULL; int bstop = 0; /* Traverse all of the allocated UDP connections and perform the poll * action. */ while (!bstop && (conn = udp_nextconn(conn))) { #ifdef CONFIG_NET_UDP_WRITE_BUFFERS /* Skip UDP connections that are bound to other polling devices */ if (dev == conn->dev) #endif { /* Perform the UDP TX poll */ udp_poll(dev, conn); /* Perform any necessary conversions on outgoing packets */ devif_packet_conversion(dev, DEVIF_UDP); /* Call back into the driver */ bstop = devif_poll_out(dev, callback); } } return bstop; } #endif /* NET_UDP_HAVE_STACK */ /**************************************************************************** * Name: devif_poll_tcp_connections * * Description: * Poll all TCP connections for available packets to send. * * Assumptions: * This function is called from the MAC device driver with the network * locked. * ****************************************************************************/ #ifdef NET_TCP_HAVE_STACK static inline int devif_poll_tcp_connections(FAR struct net_driver_s *dev, devif_poll_callback_t callback) { FAR struct tcp_conn_s *conn = NULL; int bstop = 0; /* Traverse all of the active TCP connections and perform the poll action */ while (!bstop && (conn = tcp_nextconn(conn))) { /* Skip TCP connections that are bound to other polling devices */ if (dev == conn->dev) { /* Perform the TCP TX poll */ tcp_poll(dev, conn); /* Perform any necessary conversions on outgoing packets */ devif_packet_conversion(dev, DEVIF_TCP); /* Call back into the driver */ bstop = devif_poll_out(dev, callback); } } return bstop; } #else # define devif_poll_tcp_connections(dev, callback) (0) #endif /**************************************************************************** * Name: devif_poll_ipfrag * * Description: * Poll all ip fragments for available packets to send. * * Input Parameters: * dev - NIC Device instance. * callback - the actual sending API provided by each NIC driver. * * Returned Value: * Zero indicated the polling will continue, else stop the polling. * * Assumptions: * This function is called from the MAC device driver with the network * locked. * ****************************************************************************/ #ifdef CONFIG_NET_IPFRAG static int devif_poll_ipfrag(FAR struct net_driver_s *dev, devif_poll_callback_t callback) { FAR struct iob_s *frag; bool reused = false; int bstop = false; while (!bstop) { /* Dequeue outgoing fragment from dev->d_fragout */ frag = iob_remove_queue(&dev->d_fragout); if (frag == NULL) { break; } /* Frag buffer could be reused for other protocols */ reused = true; /* Replace original iob */ netdev_iob_replace(dev, frag); /* build L2 headers */ devif_out(dev); /* Call back into the driver */ bstop = callback(dev); } /* Notify the device driver that ip fragments is available. */ if (iob_peek_queue(&dev->d_fragout) != NULL) { netdev_txnotify_dev(dev); } /* Reuse iob buffer */ if (!bstop && reused) { iob_update_pktlen(dev->d_iob, 0); netdev_iob_prepare(dev, true, 0); } return bstop; } #endif /**************************************************************************** * Name: devif_poll_connections * * Description: * This function will traverse each active network connection structure and * will perform network polling operations. devif_poll() may be called * asynchronously with the network driver can accept another outgoing * packet. * * This function will call the provided callback function for every active * connection. Polling will continue until all connections have been polled * or until the user-supplied function returns a non-zero value (which it * should do only if it cannot accept further write data). * * When the callback function is called, there may be an outbound packet * waiting for service in the device packet buffer, and if so the d_len * field is set to a value larger than zero. The device driver should then * send out the packet. * * Assumptions: * This function is called from the MAC device driver with the network * locked. * ****************************************************************************/ static int devif_poll_connections(FAR struct net_driver_s *dev, devif_poll_callback_t callback) { int bstop = false; /* Reset device buffer length */ dev->d_len = 0; /* Traverse all of the active packet connections and perform the poll * action. */ #ifdef CONFIG_NET_IPFRAG /* Traverse all of ip fragments for available packets to transfer */ bstop = devif_poll_ipfrag(dev, callback); if (!bstop) #endif #ifdef CONFIG_NET_ARP_SEND { /* Check for pending ARP requests */ bstop = arp_poll(dev, callback); } if (!bstop) #endif #ifdef CONFIG_NET_PKT { /* Check for pending packet socket transfer */ bstop = devif_poll_pkt_connections(dev, callback); } if (!bstop) #endif #ifdef CONFIG_NET_CAN { /* Check for pending CAN socket transfer */ bstop = devif_poll_can_connections(dev, callback); } if (!bstop) #endif #ifdef CONFIG_NET_BLUETOOTH { /* Check for pending PF_BLUETOOTH socket transfer */ bstop = devif_poll_bluetooth_connections(dev, callback); } if (!bstop) #endif #ifdef CONFIG_NET_IEEE802154 { /* Check for pending PF_IEEE802154 socket transfer */ bstop = devif_poll_ieee802154_connections(dev, callback); } if (!bstop) #endif #ifdef CONFIG_NET_IGMP { /* Check for pending IGMP messages */ bstop = devif_poll_igmp(dev, callback); } if (!bstop) #endif #ifdef CONFIG_NET_MLD { /* Check for pending MLD messages */ bstop = devif_poll_mld(dev, callback); } if (!bstop) #endif #ifdef NET_TCP_HAVE_STACK { /* Traverse all of the active TCP connections and perform the poll * action. */ bstop = devif_poll_tcp_connections(dev, callback); } if (!bstop) #endif #ifdef NET_UDP_HAVE_STACK { /* Traverse all of the allocated UDP connections and perform * the poll action */ bstop = devif_poll_udp_connections(dev, callback); } if (!bstop) #endif #if defined(CONFIG_NET_ICMP) && defined(CONFIG_NET_ICMP_SOCKET) { /* Traverse all of the tasks waiting to send an ICMP ECHO request. */ bstop = devif_poll_icmp(dev, callback); } if (!bstop) #endif #if defined(CONFIG_NET_ICMPv6_SOCKET) || defined(CONFIG_NET_ICMPv6_NEIGHBOR) { /* Traverse all of the tasks waiting to send an ICMPv6 ECHO request. */ bstop = devif_poll_icmpv6(dev, callback); } if (!bstop) #endif #ifdef CONFIG_NET_IPFORWARD { /* Traverse all of the tasks waiting to forward a packet to this * device. */ bstop = devif_poll_forward(dev, callback); } if (!bstop) #endif { /* Nothing more to do */ } return bstop; } /**************************************************************************** * Name: devif_iob_poll * * Description: * This function will traverse each active network connection structure and * will perform network polling operations. devif_poll() may be called * asynchronously with the network driver can accept another outgoing * packet. * * This function will call the provided callback function for every active * connection. Polling will continue until all connections have been polled * or until the user-supplied function returns a non-zero value (which it * should do only if it cannot accept further write data). * * When the callback function is called, there may be an outbound packet * waiting for service in the device packet buffer, and if so the d_len * field is set to a value larger than zero. The device driver should then * send out the packet. * * This is the iob buffer version of devif_input(), * this function will support send/receive iob vectors directly between * the driver and l3/l4 stack to avoid unnecessary memory copies, * especially on hardware that supports Scatter/gather, which can * greatly improve performance * this function will uses d_iob as packets input which used by some * NICs such as celluler net driver. * * If NIC hardware support Scatter/gather transfer * * tcp_poll()/udp_poll()/pkt_poll()/...(l3/l4) * / \ * / \ * devif_poll_[l3|l4]_connections() devif_iob_send() (nocopy:udp/icmp/...) * / \ (copy:tcp) * / \ * devif_iob_poll("NIC"_txpoll) callback() // "NIC"_txpoll * * * Assumptions: * This function is called from the MAC device driver with the network * locked. * ****************************************************************************/ static int devif_iob_poll(FAR struct net_driver_s *dev, devif_poll_callback_t callback) { int bstop; /* Perform all connections poll */ bstop = devif_poll_connections(dev, callback); /* Device polling completed, release iob */ netdev_iob_release(dev); return bstop; } /**************************************************************************** * Name: devif_poll_callback * * Description: * This function will help us to gather multiple iob memory slices into a * linear device buffer. if devices with small memory, this function will * trigger a memory copy if net device start transmit the iob slices to * flat buffer * ****************************************************************************/ static int devif_poll_callback(FAR struct net_driver_s *dev) { if (dev->d_len > 0) { return true; } return false; } /**************************************************************************** * Public Functions ****************************************************************************/ /**************************************************************************** * Name: devif_poll * * Description: * This function will traverse each active network connection structure and * will perform network polling operations. devif_poll() may be called * asynchronously with the network driver can accept another outgoing * packet. * * This function will call the provided callback function for every active * connection. Polling will continue until all connections have been polled * or until the user-supplied function returns a non-zero value (which it * should do only if it cannot accept further write data). * * When the callback function is called, there may be an outbound packet * waiting for service in the device packet buffer, and if so the d_len * field is set to a value larger than zero. The device driver should then * send out the packet. * * Compatible with all old flat buffer NICs * * tcp_poll()/udp_poll()/pkt_poll()/...(l3|l4) * / \ * / \ * devif_poll_[l3|l4]_connections() devif_iob_send() (nocopy:udp/icmp/..) * / \ (copy:tcp) * / \ * devif_iob_poll(devif_poll_callback()) devif_poll_callback() * / \ * / \ * devif_poll("NIC"_txpoll) "NIC"_send()(dev->d_buf) * * * Assumptions: * This function is called from the MAC device driver with the network * locked. * ****************************************************************************/ int devif_poll(FAR struct net_driver_s *dev, devif_poll_callback_t callback) { uint16_t llhdrlen; FAR uint8_t *buf; int bstop; if (dev->d_buf == NULL) { return devif_iob_poll(dev, callback); } buf = dev->d_buf; llhdrlen = NET_LL_HDRLEN(dev); do { /* Perform all connections poll */ bstop = devif_poll_connections(dev, devif_poll_callback); if (dev->d_len > 0) { /* Copy iob to flat buffer */ iob_copyout(buf, dev->d_iob, dev->d_len, -llhdrlen); /* Restore flat buffer pointer */ dev->d_buf = buf; /* Call the real device callback */ bstop = callback(dev); /* Flat buffer changed by NIC ? */ if (dev->d_buf != buf) { buf = dev->d_buf; if (buf == NULL) { break; } } } else { /* Not stopped by devif_poll_callback, just stop and return bstop */ break; } } while (!bstop); /* Device polling completed, release iob */ netdev_iob_release(dev); /* Restore the flat buffer */ dev->d_buf = buf; return bstop; } /**************************************************************************** * Name: devif_out * * Description: * Generic interface to build L2 headers * * Assumptions: * This function is called from the MAC device driver with the network * locked. * ****************************************************************************/ void devif_out(FAR struct net_driver_s *dev) { if (dev->d_len == 0) { return; } switch (dev->d_lltype) { #ifdef CONFIG_NET_ETHERNET case NET_LL_ETHERNET: case NET_LL_IEEE80211: # ifdef CONFIG_NET_IPv4 # ifdef CONFIG_NET_IPv6 if (IFF_IS_IPv4(dev->d_flags)) # endif /* CONFIG_NET_IPv6 */ { arp_out(dev); } # endif /* CONFIG_NET_IPv4 */ # ifdef CONFIG_NET_IPv6 # ifdef CONFIG_NET_IPv4 else # endif /* CONFIG_NET_IPv4 */ { neighbor_out(dev); } # endif /* CONFIG_NET_IPv6 */ break; #endif /* CONFIG_NET_ETHERNET */ default: break; } } /**************************************************************************** * Name: devif_poll_out * * Description: * Generic callback before device output to build L2 headers before sending * * Assumptions: * This function is called from the MAC device driver with the network * locked. * ****************************************************************************/ int devif_poll_out(FAR struct net_driver_s *dev, devif_poll_callback_t callback) { int bstop; if (dev->d_len == 0) { return 0; } devif_out(dev); bstop = devif_loopback(dev); if (bstop) { return bstop; } if (callback) { #ifdef CONFIG_NET_IPFRAG if (ip_fragout(dev) != OK) { netdev_iob_release(dev); return 1; } else if (iob_peek_queue(&dev->d_fragout) != NULL) { return devif_poll_ipfrag(dev, callback); } #endif return callback(dev); } return 0; } #endif /* CONFIG_NET */