/**************************************************************************** * net/devif/devif_poll.c * * Copyright (C) 2007-2010, 2012, 2014, 2016 Gregory Nutt. All rights reserved. * Author: Gregory Nutt * * 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. Neither the name NuttX nor the names of its contributors may be * used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "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 * COPYRIGHT OWNER OR CONTRIBUTORS 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. * ****************************************************************************/ /**************************************************************************** * Included Files ****************************************************************************/ #include #ifdef CONFIG_NET #include #include #include #include #include #include "devif/devif.h" #include "arp/arp.h" #include "neighbor/neighbor.h" #include "tcp/tcp.h" #include "udp/udp.h" #include "pkt/pkt.h" #include "icmp/icmp.h" #include "icmpv6/icmpv6.h" #include "igmp/igmp.h" #include "sixlowpan/sixlowpan.h" /**************************************************************************** * Private Types ****************************************************************************/ enum devif_packet_type { DEVIF_PKT = 0, DEVIF_ICMP, DEVIF_IGMP, DEVIF_TCP, DEVIF_UDP, DEVIF_ICMP6 }; /**************************************************************************** * Public Data ****************************************************************************/ /* Time of last poll */ systime_t g_polltime; /**************************************************************************** * Private Functions ****************************************************************************/ /**************************************************************************** * Function: devif_packet_conversion * * Description: * Generic output conversion hook. Only needed for IEEE802.15.4 for now * 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 an * IEEE802.15.4, the TCP output is caught in the socket * send()/sendto() logic and 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 an * IEEE802.15.4 MAC network driver. Under those conditions, 6loWPAN * logic will be called to create the IEEE80215.4 frames. * * 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) { #ifdef CONFIG_NET_MULTILINK /* Handle the case where multiple link layer protocols are supported */ if (dev->d_len > 0 && dev->d_lltype == NET_LL_IEEE802154) #else if (dev->d_len > 0) #endif { if (pkttype == DEVIF_TCP) { FAR struct ipv6_hdr_s *ipv6 = (FAR struct ipv6_hdr_s *)dev->d_buf; /* This packet came from a response to TCP polling and is directed * to an IEEE802.15.4 device using 6loWPAN. Verify that the outgoing * packet is IPv6 with TCP protocol. */ if (ipv6->vtc == IPv6_VERSION && ipv6->proto == IP_PROTO_TCP) { /* Let 6loWPAN convert IPv6 TCP output into IEEE802.15.4 frames. */ sixlowpan_tcp_send(dev); } else { nerr("ERROR: IPv6 version or protocol error. Packet dropped\n"); nerr(" IP version: %02x proocol: %u\n", ipv6->vtc, ipv6->proto); } } else { nerr("ERROR: Non-TCP packet dropped. Packet type: %u\n", pkttype); } dev->d_len = 0; } } #else # define devif_packet_conversion(dev,pkttype) #endif /* CONFIG_NET_6LOWPAN */ /**************************************************************************** * Function: devif_poll_pkt_connections * * Description: * Poll all packet connections for available packets to send. * * Assumptions: * This function is called from the MAC device driver and may be called * from the timer interrupt/watchdog handle level. * ****************************************************************************/ #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))) { /* 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 */ bstop = callback(dev); } return bstop; } #endif /* CONFIG_NET_PKT */ /**************************************************************************** * Function: 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_PING) static inline int devif_poll_icmp(FAR struct net_driver_s *dev, devif_poll_callback_t callback) { /* Perform the ICMP poll */ icmp_poll(dev); /* Perform any necessary conversions on outgoing packets */ devif_packet_conversion(dev, DEVIF_ICMP); /* Call back into the driver */ return callback(dev); } #endif /* CONFIG_NET_ICMP && CONFIG_NET_ICMP_PING */ /**************************************************************************** * Function: devif_poll_icmpv6 * * Description: * Poll all of the connections waiting to send an ICMPv6 ECHO request * ****************************************************************************/ #if defined(CONFIG_NET_ICMPv6_PING) || defined(CONFIG_NET_ICMPv6_NEIGHBOR) static inline int devif_poll_icmpv6(FAR struct net_driver_s *dev, devif_poll_callback_t callback) { /* Perform the ICMPv6 poll */ icmpv6_poll(dev); /* Perform any necessary conversions on outgoing packets */ devif_packet_conversion(dev, DEVIF_ICMP6); /* Call back into the driver */ return callback(dev); } #endif /* CONFIG_NET_ICMPv6_PING || CONFIG_NET_ICMPv6_NEIGHBOR*/ /**************************************************************************** * Function: devif_poll_igmp * * Description: * Poll all IGMP connections for available packets to send. * * Assumptions: * This function is called from the MAC device driver and may be called * from the timer interrupt/watchdog handle level. * ****************************************************************************/ #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 callback(dev); } #endif /* CONFIG_NET_IGMP */ /**************************************************************************** * Function: devif_poll_udp_connections * * Description: * Poll all UDP connections for available packets to send. * * Assumptions: * This function is called from the MAC device driver and may be called * from the timer interrupt/watchdog handle level. * ****************************************************************************/ #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))) { /* 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 = callback(dev); } return bstop; } #endif /* NET_UDP_HAVE_STACK */ /**************************************************************************** * Function: devif_poll_tcp_connections * * Description: * Poll all UDP connections for available packets to send. * * Assumptions: * This function is called from the MAC device driver and may be called * from the timer interrupt/watchdog handle level. * ****************************************************************************/ #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))) { /* 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 = callback(dev); } return bstop; } #else # define devif_poll_tcp_connections(dev, callback) (0) #endif /**************************************************************************** * Function: devif_poll_tcp_timer * * Description: * The TCP timer has expired. Update TCP timing state in each active, * TCP connection. * * Assumptions: * This function is called from the MAC device driver and may be called * from the timer interrupt/watchdog handle level. * ****************************************************************************/ #ifdef NET_TCP_HAVE_STACK static inline int devif_poll_tcp_timer(FAR struct net_driver_s *dev, devif_poll_callback_t callback, int hsec) { 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))) { /* Perform the TCP timer poll */ tcp_timer(dev, conn, hsec); /* Perform any necessary conversions on outgoing packets */ devif_packet_conversion(dev, DEVIF_TCP); /* Call back into the driver */ bstop = callback(dev); } return bstop; } #else # define devif_poll_tcp_timer(dev, callback, hsec) (0) #endif /**************************************************************************** * Public Functions ****************************************************************************/ /**************************************************************************** * Function: 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. * * Assumptions: * This function is called from the MAC device driver and may be called * from the timer interrupt/watchdog handle level. * ****************************************************************************/ int devif_poll(FAR struct net_driver_s *dev, devif_poll_callback_t callback) { int bstop = false; /* Traverse all of the active packet connections and perform the poll * action. */ #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_IGMP { /* Check for pending IGMP messages */ bstop = devif_poll_igmp(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_PING) { /* 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_PING) || 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 { /* Nothing more to do */ } return bstop; } /**************************************************************************** * Function: devif_timer * * Description: * These function will traverse each active network connection structure and * perform network timer operations. The Ethernet driver MUST implement * logic to periodically call devif_timer(). * * 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 and may be called from * the timer interrupt/watchdog handle level. * ****************************************************************************/ int devif_timer(FAR struct net_driver_s *dev, devif_poll_callback_t callback) { systime_t now; systime_t elapsed; int bstop = false; /* Get the elapsed time since the last poll in units of half seconds * (truncating). */ now = clock_systimer(); elapsed = now - g_polltime; /* Process time-related events only when more than one half second elapses. */ if (elapsed >= TICK_PER_HSEC) { /* Calculate the elpased time in units of half seconds (truncating to * number of whole half seconds). */ int hsec = (int)(elapsed / TICK_PER_HSEC); /* Update the current poll time (truncating to the last half second * boundary to avoid error build-up). */ g_polltime += (TICK_PER_HSEC * (systime_t)hsec); /* Perform periodic activitives that depend on hsec > 0 */ #if defined(CONFIG_NET_TCP_REASSEMBLY) && defined(CONFIG_NET_IPv4) /* Increment the timer used by the IP reassembly logic */ if (g_reassembly_timer != 0 && g_reassembly_timer < CONFIG_NET_TCP_REASS_MAXAGE) { g_reassembly_timer += hsec; } #endif #ifdef CONFIG_NET_IPv6 /* Perform aging on the entries in the Neighbor Table */ neighbor_periodic(hsec); #endif #ifdef NET_TCP_HAVE_STACK /* Traverse all of the active TCP connections and perform the * timer action. */ bstop = devif_poll_tcp_timer(dev, callback, hsec); #endif } /* If possible, continue with a normal poll checking for pending * network driver actions. */ if (!bstop) { bstop = devif_poll(dev, callback); } return bstop; } #endif /* CONFIG_NET */