/**************************************************************************** * uip-arch.h * Defines architecture-specific device driver interfaces to uIP * * Copyright (C) 2007 Gregory Nutt. All rights reserved. * Author: Gregory Nutt * * Derived largely from portions of uIP with has a similar BSD-styple license: * * Copyright (c) 2001-2003, Adam Dunkels. * All rights reserved. * * 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. * ****************************************************************************/ #ifndef __UIP_ARCH_H #define __UIP_ARCH_H #include #include #include #include /**************************************************************************** * Included Files ****************************************************************************/ #include /**************************************************************************** * Definitions ****************************************************************************/ /* The following flags are passed as an argument to the uip_interrupt() * function. They are used to distinguish between the two cases where * uip_interrupt() is called. It can be called either because we have * incoming data that should be processed, or because the periodic * timer has fired. These values are never used directly, but only in * the macrose defined in this file. * * UIP_DRV_RECEIVE - There is new incoming data from the driver in the d_buf * field of the uip_driver_s structure. The length of the * new data is provided in the d_len field of the * uip_driver_s structure. * UIP_DRV_TIMER - Called periodically from driver to service timeout- * related activities to and to get timeout-related * responses (e.g., reset) * UIP_DRV_POLL - Poll TCP for data to be transmitted * UIP_DRV_UDPPOLL - Poll for UDP data to be transmitted. This value is used * internally by the uip_poll logic. */ #define UIP_DRV_RECEIVE 1 #define UIP_DRV_TIMER 2 #define UIP_DRV_POLL 3 #ifdef CONFIG_NET_UDP # define UIP_DRV_UDPPOLL 4 #endif /**************************************************************************** * Public Types ****************************************************************************/ /* This structure collects information that is specific to a specific network * interface driver. If the hardware platform supports only a single instance * of this structure. */ struct uip_driver_s { /* This link is used to maintain a single-linked list of ethernet drivers. * Must be the first field in the structure due to blink type casting. */ #if CONFIG_NSOCKET_DESCRIPTORS > 0 FAR struct uip_driver_s *flink; /* This is the name of network device assigned when netdev_register was called. * This name is only used to support socket ioctl lookups by device name * Examples: "eth0" */ char d_ifname[IFNAMSIZ]; #endif /* Device identitity */ struct uip_eth_addr d_mac; /* Device MAC address */ /* Network identity */ uip_ipaddr_t d_ipaddr; /* Host IP address assigned to the network interface */ uip_ipaddr_t d_draddr; /* Default router IP address */ uip_ipaddr_t d_netmask; /* Network subnet mask */ /* The d_buf array is used to hold incoming and outgoing * packets. The device driver should place incoming data into this * buffer. When sending data, the device driver should read the link * level headers and the TCP/IP headers from this buffer. The size of * the link level headers is configured by the UIP_LLH_LEN define. * * Note: The application data need not be placed in this buffer, so * the device driver must read it from the place pointed to by the * d_appdata pointer as illustrated by the following example: * * void * devicedriver_send(void) * { * hwsend(&dev->d_buf[0], UIP_LLH_LEN); * if(dev->d_len <= UIP_LLH_LEN + UIP_TCPIP_HLEN) { * hwsend(&dev->d_buf[UIP_LLH_LEN], dev->d_len - UIP_LLH_LEN); * } else { * hwsend(&dev->d_buf[UIP_LLH_LEN], UIP_TCPIP_HLEN); * hwsend(dev->d_appdata, dev->d_len - UIP_TCPIP_HLEN - UIP_LLH_LEN); * } * } */ uint8 d_buf[UIP_BUFSIZE + 2]; /* d_appdata points to the location where application data can be read from * or written into a packet. */ uint8 *d_appdata; /* This is a pointer into d_buf where a user application may append * data to be sent. */ uint8 *d_snddata; /* The length of the packet in the d_buf buffer. * * Holds the length of the packet in the d_buf buffer. * * When the network device driver calls the uIP input function, * d_len should be set to the length of the packet in the d_buf * buffer. * * When sending packets, the device driver should use the contents of * the d_len variable to determine the length of the outgoing * packet. */ uint16 d_len; /* When d_buf contains outgoing xmit data, xmtlen is nonzero and represents * the amount of appllcation data after d_snddata */ uint16 d_sndlen; /* Driver callbacks */ int (*d_ifup)(struct uip_driver_s *dev); int (*d_ifdown)(struct uip_driver_s *dev); /* Drivers may attached device-specific, private information */ void *d_private; }; /**************************************************************************** * Public Variables ****************************************************************************/ /**************************************************************************** * Pulblic Function Prototypes ****************************************************************************/ /* uIP device driver functions * * These functions are used by a network device driver for interacting * with uIP. * * Process an incoming packet. * * This function should be called when the device driver has received * a packet from the network. The packet from the device driver must * be present in the d_buf buffer, and the length of the packet * should be placed in the d_len field. * * When the function returns, there may be an outbound packet placed * in the d_buf packet buffer. If so, the d_len field is set to * the length of the packet. If no packet is to be sent out, the * d_len field is set to 0. * * The usual way of calling the function is presented by the source * code below. * * dev->d_len = devicedriver_poll(); * if(dev->d_len > 0) { * uip_input(); * if(dev->d_len > 0) { * devicedriver_send(); * } * } * * Note: If you are writing a uIP device driver that needs ARP * (Address Resolution Protocol), e.g., when running uIP over * Ethernet, you will need to call the uIP ARP code before calling * this function: * * #define BUF ((struct uip_eth_hdr *)&dev->d_buf[0]) * dev->d_len = ethernet_devicedrver_poll(); * if(dev->d_len > 0) { * if(BUF->type == HTONS(UIP_ETHTYPE_IP)) { * uip_arp_ipin(); * uip_input(); * if(dev->d_len > 0) { * uip_arp_out(); * devicedriver_send(); * } * } else if(BUF->type == HTONS(UIP_ETHTYPE_ARP)) { * uip_arp_arpin(); * if(dev->d_len > 0) { * devicedriver_send(); * } * } */ #define uip_input(dev) uip_interrupt(dev, UIP_DRV_RECEIVE) /* Polling of connections. * * This function will traverse each active uIP connection structure and * perform uip_interrupt with the specified event. After each polling each * active uIP connection structure, this function will call the provided * callback function if the poll resulted in new data to be send. The poll * will continue until all connections have been polled or until the user- * suplied function returns a non-zero value (which is would do only if * it cannot accept further write data). * * This function should be called periodically with event == UIP_DRV_TIMER * to perform TCP. This function may also be called with UIP_DRV_POLL to * obtain pending TX data. * * This function is called from the CAN device driver and may be called from * the timer interrupt/watchdog handle level. * * When the callback function is called, there may be an outbound packet * waiting for service in the uIP packet buffer, and if so the d_len field * is set to a value larger than zero. The device driver should be called to * send out the packet. * * Example: * int driver_callback(struct uip_driver_dev *dev) * { * if (dev->d_len > 0) * { * devicedriver_send(); * return 1; <-- Terminates polling if necessary * } * return 0; * } * * ... * uip_poll(dev, driver_callback, UIP_DRV_TIMER); * * Note: If you are writing a uIP device driver that needs ARP (Address * Resolution Protocol), e.g., when running uIP over Ethernet, you will * need to call the uip_arp_out() function in the callback function * before sending the packet: * * int driver_callback(struct uip_driver_dev *dev) * { * if (dev->d_len > 0) * { * uip_arp_out(); * devicedriver_send(); * return 1; <-- Terminates polling if necessary * } * return 0; * } */ typedef int (*uip_poll_callback_t)(struct uip_driver_s *dev); extern int uip_poll(struct uip_driver_s *dev, uip_poll_callback_t callback, int event); /* uip_poll helper functions */ #define uip_periodic(dev,cb) uip_poll(dev, db, UIP_DRV_TIMER); /* Architecure support * * The actual uIP function which does all the work. Called from the * interrupt level by a device driver. */ extern void uip_interrupt(struct uip_driver_s *dev, uint8 event); /* By defining UIP_ARCH_CHKSUM, the architecture can replace the following * functions with hardware assisted solutions. */ /* Carry out a 32-bit addition. * * Because not all architectures for which uIP is intended has native * 32-bit arithmetic, uIP uses an external C function for doing the * required 32-bit additions in the TCP protocol processing. This * function should add the two arguments and place the result in the * global variable uip_acc32. * * Note: The 32-bit integer pointed to by the op32 parameter and the * result in the uip_acc32 variable are in network byte order (big * endian). * * op32 A pointer to a 4-byte array representing a 32-bit * integer in network byte order (big endian). * * op16 A 16-bit integer in host byte order. */ extern void uip_add32(uint8 *op32, uint16 op16); /* Calculate the Internet checksum over a buffer. * * The Internet checksum is the one's complement of the one's * complement sum of all 16-bit words in the buffer. * * See RFC1071. * * Note: This function is not called in the current version of uIP, * but future versions might make use of it. * * buf A pointer to the buffer over which the checksum is to be * computed. * * len The length of the buffer over which the checksum is to * be computed. * * Return: The Internet checksum of the buffer. */ extern uint16 uip_chksum(uint16 *buf, uint16 len); /* Calculate the IP header checksum of the packet header in d_buf. * * The IP header checksum is the Internet checksum of the 20 bytes of * the IP header. * * Return: The IP header checksum of the IP header in the d_buf * buffer. */ extern uint16 uip_ipchksum(struct uip_driver_s *dev); /* Calculate the TCP checksum of the packet in d_buf and d_appdata. * * The TCP checksum is the Internet checksum of data contents of the * TCP segment, and a pseudo-header as defined in RFC793. * * Note: The d_appdata pointer that points to the packet data may * point anywhere in memory, so it is not possible to simply calculate * the Internet checksum of the contents of the d_buf buffer. * * Return: The TCP checksum of the TCP segment in d_buf and pointed * to by d_appdata. */ extern uint16 uip_tcpchksum(struct uip_driver_s *dev); extern uint16 uip_udpchksum(struct uip_driver_s *dev); #endif /* __UIP_ARCH_H */