diff options
Diffstat (limited to 'nuttx/net/uip/uip_input.c')
| -rw-r--r-- | nuttx/net/uip/uip_input.c | 545 |
1 files changed, 0 insertions, 545 deletions
diff --git a/nuttx/net/uip/uip_input.c b/nuttx/net/uip/uip_input.c deleted file mode 100644 index 878b351a7..000000000 --- a/nuttx/net/uip/uip_input.c +++ /dev/null @@ -1,545 +0,0 @@ -/**************************************************************************** - * netuip/uip_input.c - * The uIP TCP/IP stack code. - * - * Copyright (C) 2007-2009, 2012 Gregory Nutt. All rights reserved. - * Author: Gregory Nutt <gnutt@nuttx.org> - * - * Adapted for NuttX from logic in uIP which also has a BSD-like license: - * - * uIP is an implementation of the TCP/IP protocol stack intended for - * small 8-bit and 16-bit microcontrollers. - * - * uIP provides the necessary protocols for Internet communication, - * with a very small code footprint and RAM requirements - the uIP - * code size is on the order of a few kilobytes and RAM usage is on - * the order of a few hundred bytes. - * - * Original author Adam Dunkels <adam@dunkels.com> - * Copyright () 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. The name of the author may not be used to endorse or promote - * products derived from this software without specific prior - * written permission. - * - * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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. - * - ****************************************************************************/ - -/**************************************************************************** - * uIP is a small implementation of the IP, UDP and TCP protocols (as - * well as some basic ICMP stuff). The implementation couples the IP, - * UDP, TCP and the application layers very tightly. To keep the size - * of the compiled code down, this code frequently uses the goto - * statement. While it would be possible to break the uip_input() - * function into many smaller functions, this would increase the code - * size because of the overhead of parameter passing and the fact that - * the optimier would not be as efficient. - * - * The principle is that we have a small buffer, called the d_buf, - * in which the device driver puts an incoming packet. The TCP/IP - * stack parses the headers in the packet, and calls the - * application. If the remote host has sent data to the application, - * this data is present in the d_buf and the application read the - * data from there. It is up to the application to put this data into - * a byte stream if needed. The application will not be fed with data - * that is out of sequence. - * - * If the application whishes to send data to the peer, it should put - * its data into the d_buf. The d_appdata pointer points to the - * first available byte. The TCP/IP stack will calculate the - * checksums, and fill in the necessary header fields and finally send - * the packet back to the peer. - * - ****************************************************************************/ - -/**************************************************************************** - * Included Files - ****************************************************************************/ - -#include <nuttx/config.h> -#ifdef CONFIG_NET - -#include <sys/ioctl.h> -#include <stdint.h> -#include <debug.h> -#include <string.h> - -#include <nuttx/net/uip/uipopt.h> -#include <nuttx/net/uip/uip.h> -#include <nuttx/net/uip/uip-arch.h> - -#ifdef CONFIG_NET_IPv6 -# include "uip_neighbor.h" -#endif /* CONFIG_NET_IPv6 */ - -#include "uip_internal.h" - -/**************************************************************************** - * Pre-processor Definitions - ****************************************************************************/ - -/* Macros. */ - -#define BUF ((struct uip_ip_hdr *)&dev->d_buf[UIP_LLH_LEN]) -#define FBUF ((struct uip_ip_hdr *)&uip_reassbuf[0]) - -/* IP fragment re-assembly */ - -#define IP_MF 0x20 -#define UIP_REASS_BUFSIZE (CONFIG_NET_BUFSIZE - UIP_LLH_LEN) -#define UIP_REASS_FLAG_LASTFRAG 0x01 - -/**************************************************************************** - * Public Variables - ****************************************************************************/ - -/**************************************************************************** - * Private Variables - ****************************************************************************/ - -#if UIP_REASSEMBLY && !defined(CONFIG_NET_IPv6) -static uint8_t uip_reassbuf[UIP_REASS_BUFSIZE]; -static uint8_t uip_reassbitmap[UIP_REASS_BUFSIZE / (8 * 8)]; -static const uint8_t bitmap_bits[8] = {0xff, 0x7f, 0x3f, 0x1f, 0x0f, 0x07, 0x03, 0x01}; -static uint16_t uip_reasslen; -static uint8_t uip_reassflags; -#endif /* UIP_REASSEMBLY */ - -/**************************************************************************** - * Private Functions - ****************************************************************************/ - -/**************************************************************************** - * Function: uip_reass - * - * Description: - * IP fragment reassembly: not well-tested. - * - * Assumptions: - * - ****************************************************************************/ - -#if UIP_REASSEMBLY && !defined(CONFIG_NET_IPv6) -static uint8_t uip_reass(void) -{ - struct uip_ip_hdr *pbuf = BUF; - struct uip_ip_hdr *pfbuf = FBUF; - uint16_t offset; - uint16_t len; - uint16_t i; - - /* If uip_reasstmr is zero, no packet is present in the buffer, so we - * write the IP header of the fragment into the reassembly - * buffer. The timer is updated with the maximum age. - */ - - if (!uip_reasstmr) - { - memcpy(uip_reassbuf, &pbuf->vhl, UIP_IPH_LEN); - uip_reasstmr = UIP_REASS_MAXAGE; - uip_reassflags = 0; - - /* Clear the bitmap. */ - - memset(uip_reassbitmap, 0, sizeof(uip_reassbitmap)); - } - - /* Check if the incoming fragment matches the one currently present - * in the reasembly buffer. If so, we proceed with copying the - * fragment into the buffer. - */ - - if (uiphdr_addr_cmp(pbuf->srcipaddr, pfbuf->srcipaddr) && - uiphdr_addr_cmp(pbuf->destipaddr == pfbuf->destipaddr) && - pbuf->g_ipid[0] == pfbuf->g_ipid[0] && pbuf->g_ipid[1] == pfbuf->g_ipid[1]) - { - len = (pbuf->len[0] << 8) + pbuf->len[1] - (pbuf->vhl & 0x0f) * 4; - offset = (((pbuf->ipoffset[0] & 0x3f) << 8) + pbuf->ipoffset[1]) * 8; - - /* If the offset or the offset + fragment length overflows the - * reassembly buffer, we discard the entire packet. - */ - - if (offset > UIP_REASS_BUFSIZE || offset + len > UIP_REASS_BUFSIZE) - { - uip_reasstmr = 0; - goto nullreturn; - } - - /* Copy the fragment into the reassembly buffer, at the right offset. */ - - memcpy(&uip_reassbuf[UIP_IPH_LEN + offset], (char *)pbuf + (int)((pbuf->vhl & 0x0f) * 4), len); - - /* Update the bitmap. */ - - if (offset / (8 * 8) == (offset + len) / (8 * 8)) - { - /* If the two endpoints are in the same byte, we only update that byte. */ - - uip_reassbitmap[offset / (8 * 8)] |= - bitmap_bits[(offset / 8 ) & 7] & ~bitmap_bits[((offset + len) / 8 ) & 7]; - - } - else - { - /* If the two endpoints are in different bytes, we update the bytes - * in the endpoints and fill the stuff inbetween with 0xff. - */ - - uip_reassbitmap[offset / (8 * 8)] |= bitmap_bits[(offset / 8 ) & 7]; - for (i = 1 + offset / (8 * 8); i < (offset + len) / (8 * 8); ++i) - { - uip_reassbitmap[i] = 0xff; - } - uip_reassbitmap[(offset + len) / (8 * 8)] |= ~bitmap_bits[((offset + len) / 8 ) & 7]; - } - - /* If this fragment has the More Fragments flag set to zero, we know that - * this is the last fragment, so we can calculate the size of the entire - * packet. We also set the IP_REASS_FLAG_LASTFRAG flag to indicate that - * we have received the final fragment. - */ - - if ((pbuf->ipoffset[0] & IP_MF) == 0) - { - uip_reassflags |= UIP_REASS_FLAG_LASTFRAG; - uip_reasslen = offset + len; - } - - /* Finally, we check if we have a full packet in the buffer. We do this - * by checking if we have the last fragment and if all bits in the bitmap - * are set. - */ - - if (uip_reassflags & UIP_REASS_FLAG_LASTFRAG) - { - /* Check all bytes up to and including all but the last byte in - * the bitmap. - */ - - for (i = 0; i < uip_reasslen / (8 * 8) - 1; ++i) - { - if (uip_reassbitmap[i] != 0xff) - { - goto nullreturn; - } - } - - /* Check the last byte in the bitmap. It should contain just the - * right amount of bits. - */ - - if (uip_reassbitmap[uip_reasslen / (8 * 8)] != (uint8_t)~bitmap_bits[uip_reasslen / 8 & 7]) - { - goto nullreturn; - } - - /* If we have come this far, we have a full packet in the buffer, - * so we allocate a pbuf and copy the packet into it. We also reset - * the timer. - */ - - uip_reasstmr = 0; - memcpy(pbuf, pfbuf, uip_reasslen); - - /* Pretend to be a "normal" (i.e., not fragmented) IP packet from - * now on. - */ - - pbuf->ipoffset[0] = pbuf->ipoffset[1] = 0; - pbuf->len[0] = uip_reasslen >> 8; - pbuf->len[1] = uip_reasslen & 0xff; - pbuf->ipchksum = 0; - pbuf->ipchksum = ~(uip_ipchksum(dev)); - - return uip_reasslen; - } - } - -nullreturn: - return 0; -} -#endif /* UIP_REASSEMBLY */ - -/**************************************************************************** - * Public Functions - ****************************************************************************/ - -/**************************************************************************** - * Function: uip_input - * - * Description: - * - * Assumptions: - * - ****************************************************************************/ - -void uip_input(struct uip_driver_s *dev) -{ - struct uip_ip_hdr *pbuf = BUF; - uint16_t iplen; - - /* This is where the input processing starts. */ - -#ifdef CONFIG_NET_STATISTICS - uip_stat.ip.recv++; -#endif - - /* Start of IP input header processing code. */ - -#ifdef CONFIG_NET_IPv6 - /* Check validity of the IP header. */ - - if ((pbuf->vtc & 0xf0) != 0x60) - { - /* IP version and header length. */ - -#ifdef CONFIG_NET_STATISTICS - uip_stat.ip.drop++; - uip_stat.ip.vhlerr++; -#endif - nlldbg("Invalid IPv6 version: %d\n", pbuf->vtc >> 4); - goto drop; - } -#else /* CONFIG_NET_IPv6 */ - /* Check validity of the IP header. */ - - if (pbuf->vhl != 0x45) - { - /* IP version and header length. */ - -#ifdef CONFIG_NET_STATISTICS - uip_stat.ip.drop++; - uip_stat.ip.vhlerr++; -#endif - nlldbg("Invalid IP version or header length: %02x\n", pbuf->vhl); - goto drop; - } -#endif /* CONFIG_NET_IPv6 */ - - /* Check the size of the packet. If the size reported to us in d_len is - * smaller the size reported in the IP header, we assume that the packet - * has been corrupted in transit. If the size of d_len is larger than the - * size reported in the IP packet header, the packet has been padded and - * we set d_len to the correct value. - */ - -#ifdef CONFIG_NET_IPv6 - /* The length reported in the IPv6 header is the length of the payload - * that follows the header. However, uIP uses the d_len variable for - * holding the size of the entire packet, including the IP header. For - * IPv4 this is not a problem as the length field in the IPv4 header - * contains the length of the entire packet. But for IPv6 we need to add - * the size of the IPv6 header (40 bytes). - */ - - iplen = (pbuf->len[0] << 8) + pbuf->len[1] + UIP_IPH_LEN; -#else - iplen = (pbuf->len[0] << 8) + pbuf->len[1]; -#endif /* CONFIG_NET_IPv6 */ - - if (iplen <= dev->d_len) - { - dev->d_len = iplen; - } - else - { - nlldbg("IP packet shorter than length in IP header\n"); - goto drop; - } - -#ifndef CONFIG_NET_IPv6 - /* Check the fragment flag. */ - - if ((pbuf->ipoffset[0] & 0x3f) != 0 || pbuf->ipoffset[1] != 0) - { -#if UIP_REASSEMBLY - dev->d_len = uip_reass(); - if (dev->d_len == 0) - { - goto drop; - } -#else /* UIP_REASSEMBLY */ -#ifdef CONFIG_NET_STATISTICS - uip_stat.ip.drop++; - uip_stat.ip.fragerr++; -#endif - nlldbg("IP fragment dropped\n"); - goto drop; -#endif /* UIP_REASSEMBLY */ - } -#endif /* CONFIG_NET_IPv6 */ - - /* If IP broadcast support is configured, we check for a broadcast - * UDP packet, which may be destined to us (even if there is no IP - * address yet assigned to the device as is the case when we are - * negotiating over DHCP for an address). - */ - -#if defined(CONFIG_NET_BROADCAST) && defined(CONFIG_NET_UDP) - if (pbuf->proto == UIP_PROTO_UDP && -#ifndef CONFIG_NET_IPv6 - uip_ipaddr_cmp(uip_ip4addr_conv(pbuf->destipaddr), g_alloneaddr)) -#else - uip_ipaddr_cmp(pbuf->destipaddr, g_alloneaddr)) -#endif - { - uip_udpinput(dev); - return; - } - - /* In most other cases, the device must be assigned a non-zero IP - * address. Another exception is when CONFIG_NET_PINGADDRCONF is - * enabled... - */ - - else -#endif -#ifdef CONFIG_NET_ICMP - if (uip_ipaddr_cmp(dev->d_ipaddr, g_allzeroaddr)) - { - /* If we are configured to use ping IP address configuration and - * hasn't been assigned an IP address yet, we accept all ICMP - * packets. - */ - -#if defined(CONFIG_NET_PINGADDRCONF) && !defined(CONFIG_NET_IPv6) - if (pbuf->proto == UIP_PROTO_ICMP) - { - nlldbg("Possible ping config packet received\n"); - uip_icmpinput(dev); - goto done; - } - else -#endif - { - nlldbg("No IP address assigned\n"); - goto drop; - } - } - - /* Check if the packet is destined for out IP address */ - else -#endif - { - /* Check if the packet is destined for our IP address. */ -#ifndef CONFIG_NET_IPv6 - if (!uip_ipaddr_cmp(uip_ip4addr_conv(pbuf->destipaddr), dev->d_ipaddr)) - { -#ifdef CONFIG_NET_STATISTICS - uip_stat.ip.drop++; -#endif - goto drop; - } -#else /* CONFIG_NET_IPv6 */ - /* For IPv6, packet reception is a little trickier as we need to - * make sure that we listen to certain multicast addresses (all - * hosts multicast address, and the solicited-node multicast - * address) as well. However, we will cheat here and accept all - * multicast packets that are sent to the ff02::/16 addresses. - */ - - if (!uip_ipaddr_cmp(pbuf->destipaddr, dev->d_ipaddr) && - pbuf->destipaddr[0] != 0xff02) - { -#ifdef CONFIG_NET_STATISTICS - uip_stat.ip.drop++; -#endif - goto drop; - } -#endif /* CONFIG_NET_IPv6 */ - } - -#ifndef CONFIG_NET_IPv6 - if (uip_ipchksum(dev) != 0xffff) - { - /* Compute and check the IP header checksum. */ - -#ifdef CONFIG_NET_STATISTICS - uip_stat.ip.drop++; - uip_stat.ip.chkerr++; -#endif - nlldbg("Bad IP checksum\n"); - goto drop; - } -#endif /* CONFIG_NET_IPv6 */ - - /* Everything looks good so far. Now process the incoming packet - * according to the protocol. - */ - - switch (pbuf->proto) - { -#ifdef CONFIG_NET_TCP - case UIP_PROTO_TCP: /* TCP input */ - uip_tcpinput(dev); - break; -#endif - -#ifdef CONFIG_NET_UDP - case UIP_PROTO_UDP: /* UDP input */ - uip_udpinput(dev); - break; -#endif - - /* Check for ICMP input */ - -#ifdef CONFIG_NET_ICMP -#ifndef CONFIG_NET_IPv6 - case UIP_PROTO_ICMP: /* ICMP input */ -#else - case UIP_PROTO_ICMP6: /* ICMP6 input */ -#endif - uip_icmpinput(dev); - break; -#endif - - /* Check for ICMP input */ - -#ifdef CONFIG_NET_IGMP -#ifndef CONFIG_NET_IPv6 - case UIP_PROTO_IGMP: /* IGMP input */ - uip_igmpinput(dev); - break; -#endif -#endif - - default: /* Unrecognized/unsupported protocol */ -#ifdef CONFIG_NET_STATISTICS - uip_stat.ip.drop++; - uip_stat.ip.protoerr++; -#endif - - nlldbg("Unrecognized IP protocol\n"); - goto drop; - } - - /* Return and let the caller do any actual transmission. */ - - return; - -drop: - dev->d_len = 0; -} -#endif /* CONFIG_NET */ |