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uitility/uip.c@0:5350a66d5279, 2014-09-15 (annotated)
- Committer:
- hudakz
- Date:
- Mon Sep 15 11:12:30 2014 +0000
- Revision:
- 0:5350a66d5279
rev. 00
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
hudakz | 0:5350a66d5279 | 1 | #define DEBUG_PRINTF(...) /*printf(__VA_ARGS__)*/ |
hudakz | 0:5350a66d5279 | 2 | |
hudakz | 0:5350a66d5279 | 3 | /** |
hudakz | 0:5350a66d5279 | 4 | * \defgroup uip The uIP TCP/IP stack |
hudakz | 0:5350a66d5279 | 5 | * @{ |
hudakz | 0:5350a66d5279 | 6 | * |
hudakz | 0:5350a66d5279 | 7 | * uIP is an implementation of the TCP/IP protocol stack intended for |
hudakz | 0:5350a66d5279 | 8 | * small 8-bit and 16-bit microcontrollers. |
hudakz | 0:5350a66d5279 | 9 | * |
hudakz | 0:5350a66d5279 | 10 | * uIP provides the necessary protocols for Internet communication, |
hudakz | 0:5350a66d5279 | 11 | * with a very small code footprint and RAM requirements - the uIP |
hudakz | 0:5350a66d5279 | 12 | * code size is on the order of a few kilobytes and RAM usage is on |
hudakz | 0:5350a66d5279 | 13 | * the order of a few hundred bytes. |
hudakz | 0:5350a66d5279 | 14 | */ |
hudakz | 0:5350a66d5279 | 15 | |
hudakz | 0:5350a66d5279 | 16 | /** |
hudakz | 0:5350a66d5279 | 17 | * \file |
hudakz | 0:5350a66d5279 | 18 | * The uIP TCP/IP stack code. |
hudakz | 0:5350a66d5279 | 19 | * \author Adam Dunkels <adam@dunkels.com> |
hudakz | 0:5350a66d5279 | 20 | */ |
hudakz | 0:5350a66d5279 | 21 | /* |
hudakz | 0:5350a66d5279 | 22 | * Copyright (c) 2001-2003, Adam Dunkels. |
hudakz | 0:5350a66d5279 | 23 | * All rights reserved. |
hudakz | 0:5350a66d5279 | 24 | * |
hudakz | 0:5350a66d5279 | 25 | * Redistribution and use in source and binary forms, with or without |
hudakz | 0:5350a66d5279 | 26 | * modification, are permitted provided that the following conditions |
hudakz | 0:5350a66d5279 | 27 | * are met: |
hudakz | 0:5350a66d5279 | 28 | * 1. Redistributions of source code must retain the above copyright |
hudakz | 0:5350a66d5279 | 29 | * notice, this list of conditions and the following disclaimer. |
hudakz | 0:5350a66d5279 | 30 | * 2. Redistributions in binary form must reproduce the above copyright |
hudakz | 0:5350a66d5279 | 31 | * notice, this list of conditions and the following disclaimer in the |
hudakz | 0:5350a66d5279 | 32 | * documentation and/or other materials provided with the distribution. |
hudakz | 0:5350a66d5279 | 33 | * 3. The name of the author may not be used to endorse or promote |
hudakz | 0:5350a66d5279 | 34 | * products derived from this software without specific prior |
hudakz | 0:5350a66d5279 | 35 | * written permission. |
hudakz | 0:5350a66d5279 | 36 | * |
hudakz | 0:5350a66d5279 | 37 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS |
hudakz | 0:5350a66d5279 | 38 | * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
hudakz | 0:5350a66d5279 | 39 | * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
hudakz | 0:5350a66d5279 | 40 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY |
hudakz | 0:5350a66d5279 | 41 | * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
hudakz | 0:5350a66d5279 | 42 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE |
hudakz | 0:5350a66d5279 | 43 | * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
hudakz | 0:5350a66d5279 | 44 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
hudakz | 0:5350a66d5279 | 45 | * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
hudakz | 0:5350a66d5279 | 46 | * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
hudakz | 0:5350a66d5279 | 47 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
hudakz | 0:5350a66d5279 | 48 | * |
hudakz | 0:5350a66d5279 | 49 | * This file is part of the uIP TCP/IP stack. |
hudakz | 0:5350a66d5279 | 50 | * |
hudakz | 0:5350a66d5279 | 51 | * $Id: uip.c,v 1.65 2006/06/11 21:46:39 adam Exp $ |
hudakz | 0:5350a66d5279 | 52 | * |
hudakz | 0:5350a66d5279 | 53 | */ |
hudakz | 0:5350a66d5279 | 54 | /* |
hudakz | 0:5350a66d5279 | 55 | * uIP is a small implementation of the IP, UDP and TCP protocols (as |
hudakz | 0:5350a66d5279 | 56 | * well as some basic ICMP stuff). The implementation couples the IP, |
hudakz | 0:5350a66d5279 | 57 | * UDP, TCP and the application layers very tightly. To keep the size |
hudakz | 0:5350a66d5279 | 58 | * of the compiled code down, this code frequently uses the goto |
hudakz | 0:5350a66d5279 | 59 | * statement. While it would be possible to break the uip_process() |
hudakz | 0:5350a66d5279 | 60 | * function into many smaller functions, this would increase the code |
hudakz | 0:5350a66d5279 | 61 | * size because of the overhead of parameter passing and the fact that |
hudakz | 0:5350a66d5279 | 62 | * the optimier would not be as efficient. |
hudakz | 0:5350a66d5279 | 63 | * |
hudakz | 0:5350a66d5279 | 64 | * The principle is that we have a small buffer, called the uip_buf, |
hudakz | 0:5350a66d5279 | 65 | * in which the device driver puts an incoming packet. The TCP/IP |
hudakz | 0:5350a66d5279 | 66 | * stack parses the headers in the packet, and calls the |
hudakz | 0:5350a66d5279 | 67 | * application. If the remote host has sent data to the application, |
hudakz | 0:5350a66d5279 | 68 | * this data is present in the uip_buf and the application read the |
hudakz | 0:5350a66d5279 | 69 | * data from there. It is up to the application to put this data into |
hudakz | 0:5350a66d5279 | 70 | * a byte stream if needed. The application will not be fed with data |
hudakz | 0:5350a66d5279 | 71 | * that is out of sequence. |
hudakz | 0:5350a66d5279 | 72 | * |
hudakz | 0:5350a66d5279 | 73 | * If the application whishes to send data to the peer, it should put |
hudakz | 0:5350a66d5279 | 74 | * its data into the uip_buf. The uip_appdata pointer points to the |
hudakz | 0:5350a66d5279 | 75 | * first available byte. The TCP/IP stack will calculate the |
hudakz | 0:5350a66d5279 | 76 | * checksums, and fill in the necessary header fields and finally send |
hudakz | 0:5350a66d5279 | 77 | * the packet back to the peer. |
hudakz | 0:5350a66d5279 | 78 | */ |
hudakz | 0:5350a66d5279 | 79 | #include "uip.h" |
hudakz | 0:5350a66d5279 | 80 | #include "uipopt.h" |
hudakz | 0:5350a66d5279 | 81 | #include "uip_arch.h" |
hudakz | 0:5350a66d5279 | 82 | |
hudakz | 0:5350a66d5279 | 83 | #if UIP_CONF_IPV6 |
hudakz | 0:5350a66d5279 | 84 | #include "uip-neighbor.h" |
hudakz | 0:5350a66d5279 | 85 | #endif /* UIP_CONF_IPV6 */ |
hudakz | 0:5350a66d5279 | 86 | |
hudakz | 0:5350a66d5279 | 87 | #include <string.h> |
hudakz | 0:5350a66d5279 | 88 | |
hudakz | 0:5350a66d5279 | 89 | /*---------------------------------------------------------------------------*/ |
hudakz | 0:5350a66d5279 | 90 | |
hudakz | 0:5350a66d5279 | 91 | /* Variable definitions. */ |
hudakz | 0:5350a66d5279 | 92 | /* The IP address of this host. If it is defined to be fixed (by |
hudakz | 0:5350a66d5279 | 93 | setting UIP_FIXEDADDR to 1 in uipopt.h), the address is set |
hudakz | 0:5350a66d5279 | 94 | here. Otherwise, the address */ |
hudakz | 0:5350a66d5279 | 95 | #if UIP_FIXEDADDR > 0 |
hudakz | 0:5350a66d5279 | 96 | const uip_ipaddr_t uip_hostaddr = { HTONS((UIP_IPADDR0 << 8) | UIP_IPADDR1), HTONS |
hudakz | 0:5350a66d5279 | 97 | ((UIP_IPADDR2 << 8) | UIP_IPADDR3) }; |
hudakz | 0:5350a66d5279 | 98 | const uip_ipaddr_t uip_draddr = |
hudakz | 0:5350a66d5279 | 99 | { |
hudakz | 0:5350a66d5279 | 100 | HTONS((UIP_DRIPADDR0 << 8) | UIP_DRIPADDR1), |
hudakz | 0:5350a66d5279 | 101 | HTONS((UIP_DRIPADDR2 << 8) | UIP_DRIPADDR3) |
hudakz | 0:5350a66d5279 | 102 | }; |
hudakz | 0:5350a66d5279 | 103 | const uip_ipaddr_t uip_netmask = |
hudakz | 0:5350a66d5279 | 104 | { |
hudakz | 0:5350a66d5279 | 105 | HTONS((UIP_NETMASK0 << 8) | UIP_NETMASK1), |
hudakz | 0:5350a66d5279 | 106 | HTONS((UIP_NETMASK2 << 8) | UIP_NETMASK3) |
hudakz | 0:5350a66d5279 | 107 | }; |
hudakz | 0:5350a66d5279 | 108 | #else |
hudakz | 0:5350a66d5279 | 109 | uip_ipaddr_t uip_hostaddr, uip_draddr, uip_netmask; |
hudakz | 0:5350a66d5279 | 110 | #endif /* UIP_FIXEDADDR */ |
hudakz | 0:5350a66d5279 | 111 | |
hudakz | 0:5350a66d5279 | 112 | static const uip_ipaddr_t all_ones_addr = |
hudakz | 0:5350a66d5279 | 113 | #if UIP_CONF_IPV6 |
hudakz | 0:5350a66d5279 | 114 | { 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff, 0xffff }; |
hudakz | 0:5350a66d5279 | 115 | #else /* UIP_CONF_IPV6 */ |
hudakz | 0:5350a66d5279 | 116 | { |
hudakz | 0:5350a66d5279 | 117 | 0xffff, 0xffff |
hudakz | 0:5350a66d5279 | 118 | }; |
hudakz | 0:5350a66d5279 | 119 | #endif /* UIP_CONF_IPV6 */ |
hudakz | 0:5350a66d5279 | 120 | static const uip_ipaddr_t all_zeroes_addr = |
hudakz | 0:5350a66d5279 | 121 | #if UIP_CONF_IPV6 |
hudakz | 0:5350a66d5279 | 122 | { 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000, 0x0000 }; |
hudakz | 0:5350a66d5279 | 123 | #else /* UIP_CONF_IPV6 */ |
hudakz | 0:5350a66d5279 | 124 | { |
hudakz | 0:5350a66d5279 | 125 | 0x0000, 0x0000 |
hudakz | 0:5350a66d5279 | 126 | }; |
hudakz | 0:5350a66d5279 | 127 | #endif /* UIP_CONF_IPV6 */ |
hudakz | 0:5350a66d5279 | 128 | |
hudakz | 0:5350a66d5279 | 129 | #if UIP_FIXEDETHADDR |
hudakz | 0:5350a66d5279 | 130 | const struct uip_eth_addr uip_ethaddr = |
hudakz | 0:5350a66d5279 | 131 | { |
hudakz | 0:5350a66d5279 | 132 | { UIP_ETHADDR0, UIP_ETHADDR1, UIP_ETHADDR2, UIP_ETHADDR3, UIP_ETHADDR4, UIP_ETHADDR5 } |
hudakz | 0:5350a66d5279 | 133 | }; |
hudakz | 0:5350a66d5279 | 134 | #else |
hudakz | 0:5350a66d5279 | 135 | struct uip_eth_addr uip_ethaddr = { { 0, 0, 0, 0, 0, 0 } }; |
hudakz | 0:5350a66d5279 | 136 | #endif |
hudakz | 0:5350a66d5279 | 137 | #ifndef UIP_CONF_EXTERNAL_BUFFER |
hudakz | 0:5350a66d5279 | 138 | u8_t uip_buf[UIP_BUFSIZE + 2]; /* The packet buffer that contains |
hudakz | 0:5350a66d5279 | 139 | incoming packets. */ |
hudakz | 0:5350a66d5279 | 140 | #endif /* UIP_CONF_EXTERNAL_BUFFER */ |
hudakz | 0:5350a66d5279 | 141 | |
hudakz | 0:5350a66d5279 | 142 | void* uip_appdata; /* The uip_appdata pointer points to |
hudakz | 0:5350a66d5279 | 143 | application data. */ |
hudakz | 0:5350a66d5279 | 144 | void* uip_sappdata; /* The uip_appdata pointer points to |
hudakz | 0:5350a66d5279 | 145 | the application data which is to |
hudakz | 0:5350a66d5279 | 146 | be sent. */ |
hudakz | 0:5350a66d5279 | 147 | #if UIP_URGDATA > 0 |
hudakz | 0:5350a66d5279 | 148 | void* uip_urgdata; /* The uip_urgdata pointer points to |
hudakz | 0:5350a66d5279 | 149 | urgent data (out-of-band data), if |
hudakz | 0:5350a66d5279 | 150 | present. */ |
hudakz | 0:5350a66d5279 | 151 | u16_t uip_urglen, uip_surglen; |
hudakz | 0:5350a66d5279 | 152 | #endif /* UIP_URGDATA > 0 */ |
hudakz | 0:5350a66d5279 | 153 | |
hudakz | 0:5350a66d5279 | 154 | u16_t uip_len, uip_slen; |
hudakz | 0:5350a66d5279 | 155 | |
hudakz | 0:5350a66d5279 | 156 | /* The uip_len is either 8 or 16 bits, |
hudakz | 0:5350a66d5279 | 157 | depending on the maximum packet |
hudakz | 0:5350a66d5279 | 158 | size. */ |
hudakz | 0:5350a66d5279 | 159 | u8_t uip_flags; /* The uip_flags variable is used for |
hudakz | 0:5350a66d5279 | 160 | communication between the TCP/IP stack |
hudakz | 0:5350a66d5279 | 161 | and the application program. */ |
hudakz | 0:5350a66d5279 | 162 | struct uip_conn* uip_conn; /* uip_conn always points to the current |
hudakz | 0:5350a66d5279 | 163 | connection. */ |
hudakz | 0:5350a66d5279 | 164 | |
hudakz | 0:5350a66d5279 | 165 | struct uip_conn uip_conns[UIP_CONNS]; |
hudakz | 0:5350a66d5279 | 166 | |
hudakz | 0:5350a66d5279 | 167 | /* The uip_conns array holds all TCP |
hudakz | 0:5350a66d5279 | 168 | connections. */ |
hudakz | 0:5350a66d5279 | 169 | u16_t uip_listenports[UIP_LISTENPORTS]; |
hudakz | 0:5350a66d5279 | 170 | |
hudakz | 0:5350a66d5279 | 171 | /* The uip_listenports list all currently |
hudakz | 0:5350a66d5279 | 172 | listning ports. */ |
hudakz | 0:5350a66d5279 | 173 | #if UIP_UDP |
hudakz | 0:5350a66d5279 | 174 | struct uip_udp_conn* uip_udp_conn; |
hudakz | 0:5350a66d5279 | 175 | struct uip_udp_conn uip_udp_conns[UIP_UDP_CONNS]; |
hudakz | 0:5350a66d5279 | 176 | #endif /* UIP_UDP */ |
hudakz | 0:5350a66d5279 | 177 | |
hudakz | 0:5350a66d5279 | 178 | static u16_t ipid; /* Ths ipid variable is an increasing |
hudakz | 0:5350a66d5279 | 179 | number that is used for the IP ID |
hudakz | 0:5350a66d5279 | 180 | field. */ |
hudakz | 0:5350a66d5279 | 181 | |
hudakz | 0:5350a66d5279 | 182 | /** |
hudakz | 0:5350a66d5279 | 183 | * @brief |
hudakz | 0:5350a66d5279 | 184 | * @note |
hudakz | 0:5350a66d5279 | 185 | * @param |
hudakz | 0:5350a66d5279 | 186 | * @retval |
hudakz | 0:5350a66d5279 | 187 | */ |
hudakz | 0:5350a66d5279 | 188 | void uip_setipid(u16_t id) { |
hudakz | 0:5350a66d5279 | 189 | ipid = id; |
hudakz | 0:5350a66d5279 | 190 | } |
hudakz | 0:5350a66d5279 | 191 | |
hudakz | 0:5350a66d5279 | 192 | static u8_t iss[4]; /* The iss variable is used for the TCP |
hudakz | 0:5350a66d5279 | 193 | initial sequence number. */ |
hudakz | 0:5350a66d5279 | 194 | |
hudakz | 0:5350a66d5279 | 195 | #if UIP_ACTIVE_OPEN |
hudakz | 0:5350a66d5279 | 196 | static u16_t lastport; /* Keeps track of the last port used for |
hudakz | 0:5350a66d5279 | 197 | a new connection. */ |
hudakz | 0:5350a66d5279 | 198 | #endif /* UIP_ACTIVE_OPEN */ |
hudakz | 0:5350a66d5279 | 199 | |
hudakz | 0:5350a66d5279 | 200 | /* Temporary variables. */ |
hudakz | 0:5350a66d5279 | 201 | |
hudakz | 0:5350a66d5279 | 202 | u8_t uip_acc32[4]; |
hudakz | 0:5350a66d5279 | 203 | static u8_t c, opt; |
hudakz | 0:5350a66d5279 | 204 | static u16_t tmp16; |
hudakz | 0:5350a66d5279 | 205 | |
hudakz | 0:5350a66d5279 | 206 | /* Structures and definitions. */ |
hudakz | 0:5350a66d5279 | 207 | |
hudakz | 0:5350a66d5279 | 208 | #define TCP_FIN 0x01 |
hudakz | 0:5350a66d5279 | 209 | #define TCP_SYN 0x02 |
hudakz | 0:5350a66d5279 | 210 | #define TCP_RST 0x04 |
hudakz | 0:5350a66d5279 | 211 | #define TCP_PSH 0x08 |
hudakz | 0:5350a66d5279 | 212 | #define TCP_ACK 0x10 |
hudakz | 0:5350a66d5279 | 213 | #define TCP_URG 0x20 |
hudakz | 0:5350a66d5279 | 214 | #define TCP_CTL 0x3f |
hudakz | 0:5350a66d5279 | 215 | |
hudakz | 0:5350a66d5279 | 216 | #define TCP_OPT_END 0 /* End of TCP options list */ |
hudakz | 0:5350a66d5279 | 217 | |
hudakz | 0:5350a66d5279 | 218 | #define TCP_OPT_NOOP 1 /* "No-operation" TCP option */ |
hudakz | 0:5350a66d5279 | 219 | |
hudakz | 0:5350a66d5279 | 220 | #define TCP_OPT_MSS 2 /* Maximum segment size TCP option */ |
hudakz | 0:5350a66d5279 | 221 | |
hudakz | 0:5350a66d5279 | 222 | #define TCP_OPT_MSS_LEN 4 /* Length of TCP MSS option. */ |
hudakz | 0:5350a66d5279 | 223 | |
hudakz | 0:5350a66d5279 | 224 | #define ICMP_ECHO_REPLY 0 |
hudakz | 0:5350a66d5279 | 225 | #define ICMP_ECHO 8 |
hudakz | 0:5350a66d5279 | 226 | |
hudakz | 0:5350a66d5279 | 227 | #define ICMP6_ECHO_REPLY 129 |
hudakz | 0:5350a66d5279 | 228 | #define ICMP6_ECHO 128 |
hudakz | 0:5350a66d5279 | 229 | #define ICMP6_NEIGHBOR_SOLICITATION 135 |
hudakz | 0:5350a66d5279 | 230 | #define ICMP6_NEIGHBOR_ADVERTISEMENT 136 |
hudakz | 0:5350a66d5279 | 231 | |
hudakz | 0:5350a66d5279 | 232 | #define ICMP6_FLAG_S (1 << 6) |
hudakz | 0:5350a66d5279 | 233 | #define ICMP6_OPTION_SOURCE_LINK_ADDRESS 1 |
hudakz | 0:5350a66d5279 | 234 | #define ICMP6_OPTION_TARGET_LINK_ADDRESS 2 |
hudakz | 0:5350a66d5279 | 235 | |
hudakz | 0:5350a66d5279 | 236 | /* Macros. */ |
hudakz | 0:5350a66d5279 | 237 | |
hudakz | 0:5350a66d5279 | 238 | #define BUF ((struct uip_tcpip_hdr*) &uip_buf[UIP_LLH_LEN]) |
hudakz | 0:5350a66d5279 | 239 | #define FBUF ((struct uip_tcpip_hdr*) &uip_reassbuf[0]) |
hudakz | 0:5350a66d5279 | 240 | #define ICMPBUF ((struct uip_icmpip_hdr*) &uip_buf[UIP_LLH_LEN]) |
hudakz | 0:5350a66d5279 | 241 | #define UDPBUF ((struct uip_udpip_hdr*) &uip_buf[UIP_LLH_LEN]) |
hudakz | 0:5350a66d5279 | 242 | #if UIP_STATISTICS == 1 |
hudakz | 0:5350a66d5279 | 243 | struct uip_stats uip_stat; |
hudakz | 0:5350a66d5279 | 244 | #define UIP_STAT(s) s |
hudakz | 0:5350a66d5279 | 245 | #else |
hudakz | 0:5350a66d5279 | 246 | #define UIP_STAT(s) |
hudakz | 0:5350a66d5279 | 247 | #endif /* UIP_STATISTICS == 1 */ |
hudakz | 0:5350a66d5279 | 248 | |
hudakz | 0:5350a66d5279 | 249 | #if UIP_LOGGING == 1 |
hudakz | 0:5350a66d5279 | 250 | #include <stdio.h> |
hudakz | 0:5350a66d5279 | 251 | void uip_log(char* msg); |
hudakz | 0:5350a66d5279 | 252 | #define UIP_LOG(m) uip_log(m) |
hudakz | 0:5350a66d5279 | 253 | #else |
hudakz | 0:5350a66d5279 | 254 | #define UIP_LOG(m) |
hudakz | 0:5350a66d5279 | 255 | #endif /* UIP_LOGGING == 1 */ |
hudakz | 0:5350a66d5279 | 256 | |
hudakz | 0:5350a66d5279 | 257 | #if !UIP_ARCH_ADD32 |
hudakz | 0:5350a66d5279 | 258 | |
hudakz | 0:5350a66d5279 | 259 | /** |
hudakz | 0:5350a66d5279 | 260 | * @brief |
hudakz | 0:5350a66d5279 | 261 | * @note |
hudakz | 0:5350a66d5279 | 262 | * @param |
hudakz | 0:5350a66d5279 | 263 | * @retval |
hudakz | 0:5350a66d5279 | 264 | */ |
hudakz | 0:5350a66d5279 | 265 | void uip_add32(u8_t* op32, u16_t op16) { |
hudakz | 0:5350a66d5279 | 266 | uip_acc32[3] = op32[3] + (op16 & 0xff); |
hudakz | 0:5350a66d5279 | 267 | uip_acc32[2] = op32[2] + (op16 >> 8); |
hudakz | 0:5350a66d5279 | 268 | uip_acc32[1] = op32[1]; |
hudakz | 0:5350a66d5279 | 269 | uip_acc32[0] = op32[0]; |
hudakz | 0:5350a66d5279 | 270 | |
hudakz | 0:5350a66d5279 | 271 | if(uip_acc32[2] < (op16 >> 8)) { |
hudakz | 0:5350a66d5279 | 272 | ++uip_acc32[1]; |
hudakz | 0:5350a66d5279 | 273 | if(uip_acc32[1] == 0) { |
hudakz | 0:5350a66d5279 | 274 | ++uip_acc32[0]; |
hudakz | 0:5350a66d5279 | 275 | } |
hudakz | 0:5350a66d5279 | 276 | } |
hudakz | 0:5350a66d5279 | 277 | |
hudakz | 0:5350a66d5279 | 278 | if(uip_acc32[3] < (op16 & 0xff)) { |
hudakz | 0:5350a66d5279 | 279 | ++uip_acc32[2]; |
hudakz | 0:5350a66d5279 | 280 | if(uip_acc32[2] == 0) { |
hudakz | 0:5350a66d5279 | 281 | ++uip_acc32[1]; |
hudakz | 0:5350a66d5279 | 282 | if(uip_acc32[1] == 0) { |
hudakz | 0:5350a66d5279 | 283 | ++uip_acc32[0]; |
hudakz | 0:5350a66d5279 | 284 | } |
hudakz | 0:5350a66d5279 | 285 | } |
hudakz | 0:5350a66d5279 | 286 | } |
hudakz | 0:5350a66d5279 | 287 | } |
hudakz | 0:5350a66d5279 | 288 | #endif /* UIP_ARCH_ADD32 */ |
hudakz | 0:5350a66d5279 | 289 | |
hudakz | 0:5350a66d5279 | 290 | #if !UIP_ARCH_CHKSUM |
hudakz | 0:5350a66d5279 | 291 | |
hudakz | 0:5350a66d5279 | 292 | /*---------------------------------------------------------------------------*/ |
hudakz | 0:5350a66d5279 | 293 | static u16_t chksum(u16_t sum, const u8_t* data, u16_t len) { |
hudakz | 0:5350a66d5279 | 294 | u16_t t; |
hudakz | 0:5350a66d5279 | 295 | const u8_t* dataptr; |
hudakz | 0:5350a66d5279 | 296 | const u8_t* last_byte; |
hudakz | 0:5350a66d5279 | 297 | |
hudakz | 0:5350a66d5279 | 298 | dataptr = data; |
hudakz | 0:5350a66d5279 | 299 | last_byte = data + len - 1; |
hudakz | 0:5350a66d5279 | 300 | |
hudakz | 0:5350a66d5279 | 301 | while(dataptr < last_byte) { |
hudakz | 0:5350a66d5279 | 302 | |
hudakz | 0:5350a66d5279 | 303 | /* At least two more bytes */ |
hudakz | 0:5350a66d5279 | 304 | t = (dataptr[0] << 8) + dataptr[1]; |
hudakz | 0:5350a66d5279 | 305 | sum += t; |
hudakz | 0:5350a66d5279 | 306 | if(sum < t) { |
hudakz | 0:5350a66d5279 | 307 | sum++; /* carry */ |
hudakz | 0:5350a66d5279 | 308 | } |
hudakz | 0:5350a66d5279 | 309 | |
hudakz | 0:5350a66d5279 | 310 | dataptr += 2; |
hudakz | 0:5350a66d5279 | 311 | } |
hudakz | 0:5350a66d5279 | 312 | |
hudakz | 0:5350a66d5279 | 313 | if(dataptr == last_byte) { |
hudakz | 0:5350a66d5279 | 314 | t = (dataptr[0] << 8) + 0; |
hudakz | 0:5350a66d5279 | 315 | sum += t; |
hudakz | 0:5350a66d5279 | 316 | if(sum < t) { |
hudakz | 0:5350a66d5279 | 317 | sum++; /* carry */ |
hudakz | 0:5350a66d5279 | 318 | } |
hudakz | 0:5350a66d5279 | 319 | } |
hudakz | 0:5350a66d5279 | 320 | |
hudakz | 0:5350a66d5279 | 321 | /* Return sum in host byte order. */ |
hudakz | 0:5350a66d5279 | 322 | return sum; |
hudakz | 0:5350a66d5279 | 323 | } |
hudakz | 0:5350a66d5279 | 324 | |
hudakz | 0:5350a66d5279 | 325 | /*---------------------------------------------------------------------------*/ |
hudakz | 0:5350a66d5279 | 326 | u16_t uip_chksum(u16_t* data, u16_t len) { |
hudakz | 0:5350a66d5279 | 327 | return htons(chksum(0, (u8_t*)data, len)); |
hudakz | 0:5350a66d5279 | 328 | } |
hudakz | 0:5350a66d5279 | 329 | |
hudakz | 0:5350a66d5279 | 330 | /*---------------------------------------------------------------------------*/ |
hudakz | 0:5350a66d5279 | 331 | #ifndef UIP_ARCH_IPCHKSUM |
hudakz | 0:5350a66d5279 | 332 | |
hudakz | 0:5350a66d5279 | 333 | /** |
hudakz | 0:5350a66d5279 | 334 | * @brief |
hudakz | 0:5350a66d5279 | 335 | * @note |
hudakz | 0:5350a66d5279 | 336 | * @param |
hudakz | 0:5350a66d5279 | 337 | * @retval |
hudakz | 0:5350a66d5279 | 338 | */ |
hudakz | 0:5350a66d5279 | 339 | u16_t uip_ipchksum(void) { |
hudakz | 0:5350a66d5279 | 340 | u16_t sum; |
hudakz | 0:5350a66d5279 | 341 | |
hudakz | 0:5350a66d5279 | 342 | sum = chksum(0, &uip_buf[UIP_LLH_LEN], UIP_IPH_LEN); |
hudakz | 0:5350a66d5279 | 343 | DEBUG_PRINTF("uip_ipchksum: sum 0x%04x\n", sum); |
hudakz | 0:5350a66d5279 | 344 | return(sum == 0) ? 0xffff : htons(sum); |
hudakz | 0:5350a66d5279 | 345 | } |
hudakz | 0:5350a66d5279 | 346 | #endif |
hudakz | 0:5350a66d5279 | 347 | |
hudakz | 0:5350a66d5279 | 348 | /*---------------------------------------------------------------------------*/ |
hudakz | 0:5350a66d5279 | 349 | static u16_t upper_layer_chksum(u8_t proto) { |
hudakz | 0:5350a66d5279 | 350 | u16_t upper_layer_len; |
hudakz | 0:5350a66d5279 | 351 | u16_t sum; |
hudakz | 0:5350a66d5279 | 352 | |
hudakz | 0:5350a66d5279 | 353 | #if UIP_CONF_IPV6 |
hudakz | 0:5350a66d5279 | 354 | upper_layer_len = (((u16_t) (BUF->len[0]) << 8) + BUF->len[1]); |
hudakz | 0:5350a66d5279 | 355 | #else /* UIP_CONF_IPV6 */ |
hudakz | 0:5350a66d5279 | 356 | upper_layer_len = (((u16_t) (BUF->len[0]) << 8) + BUF->len[1]) - UIP_IPH_LEN; |
hudakz | 0:5350a66d5279 | 357 | #endif /* UIP_CONF_IPV6 */ |
hudakz | 0:5350a66d5279 | 358 | |
hudakz | 0:5350a66d5279 | 359 | /* First sum pseudoheader. */ |
hudakz | 0:5350a66d5279 | 360 | |
hudakz | 0:5350a66d5279 | 361 | /* IP protocol and length fields. This addition cannot carry. */ |
hudakz | 0:5350a66d5279 | 362 | sum = upper_layer_len + proto; |
hudakz | 0:5350a66d5279 | 363 | |
hudakz | 0:5350a66d5279 | 364 | /* Sum IP source and destination addresses. */ |
hudakz | 0:5350a66d5279 | 365 | sum = chksum(sum, (u8_t*) &BUF->srcipaddr[0], 2 * sizeof(uip_ipaddr_t)); |
hudakz | 0:5350a66d5279 | 366 | |
hudakz | 0:5350a66d5279 | 367 | /* Sum TCP header and data. */ |
hudakz | 0:5350a66d5279 | 368 | sum = chksum(sum, &uip_buf[UIP_IPH_LEN + UIP_LLH_LEN], upper_layer_len); |
hudakz | 0:5350a66d5279 | 369 | |
hudakz | 0:5350a66d5279 | 370 | return(sum == 0) ? 0xffff : htons(sum); |
hudakz | 0:5350a66d5279 | 371 | } |
hudakz | 0:5350a66d5279 | 372 | |
hudakz | 0:5350a66d5279 | 373 | /*---------------------------------------------------------------------------*/ |
hudakz | 0:5350a66d5279 | 374 | #if UIP_CONF_IPV6 |
hudakz | 0:5350a66d5279 | 375 | |
hudakz | 0:5350a66d5279 | 376 | /** |
hudakz | 0:5350a66d5279 | 377 | * @brief |
hudakz | 0:5350a66d5279 | 378 | * @note |
hudakz | 0:5350a66d5279 | 379 | * @param |
hudakz | 0:5350a66d5279 | 380 | * @retval |
hudakz | 0:5350a66d5279 | 381 | */ |
hudakz | 0:5350a66d5279 | 382 | u16_t uip_icmp6chksum(void) { |
hudakz | 0:5350a66d5279 | 383 | return upper_layer_chksum(UIP_PROTO_ICMP6); |
hudakz | 0:5350a66d5279 | 384 | } |
hudakz | 0:5350a66d5279 | 385 | #endif /* UIP_CONF_IPV6 */ |
hudakz | 0:5350a66d5279 | 386 | |
hudakz | 0:5350a66d5279 | 387 | /*---------------------------------------------------------------------------*/ |
hudakz | 0:5350a66d5279 | 388 | u16_t uip_tcpchksum(void) { |
hudakz | 0:5350a66d5279 | 389 | return upper_layer_chksum(UIP_PROTO_TCP); |
hudakz | 0:5350a66d5279 | 390 | } |
hudakz | 0:5350a66d5279 | 391 | |
hudakz | 0:5350a66d5279 | 392 | /*---------------------------------------------------------------------------*/ |
hudakz | 0:5350a66d5279 | 393 | #if UIP_UDP_CHECKSUMS |
hudakz | 0:5350a66d5279 | 394 | |
hudakz | 0:5350a66d5279 | 395 | /** |
hudakz | 0:5350a66d5279 | 396 | * @brief |
hudakz | 0:5350a66d5279 | 397 | * @note |
hudakz | 0:5350a66d5279 | 398 | * @param |
hudakz | 0:5350a66d5279 | 399 | * @retval |
hudakz | 0:5350a66d5279 | 400 | */ |
hudakz | 0:5350a66d5279 | 401 | u16_t uip_udpchksum(void) { |
hudakz | 0:5350a66d5279 | 402 | return upper_layer_chksum(UIP_PROTO_UDP); |
hudakz | 0:5350a66d5279 | 403 | } |
hudakz | 0:5350a66d5279 | 404 | #endif /* UIP_UDP_CHECKSUMS */ |
hudakz | 0:5350a66d5279 | 405 | #endif /* UIP_ARCH_CHKSUM */ |
hudakz | 0:5350a66d5279 | 406 | |
hudakz | 0:5350a66d5279 | 407 | /*---------------------------------------------------------------------------*/ |
hudakz | 0:5350a66d5279 | 408 | void uip_init(void) { |
hudakz | 0:5350a66d5279 | 409 | for(c = 0; c < UIP_LISTENPORTS; ++c) { |
hudakz | 0:5350a66d5279 | 410 | uip_listenports[c] = 0; |
hudakz | 0:5350a66d5279 | 411 | } |
hudakz | 0:5350a66d5279 | 412 | |
hudakz | 0:5350a66d5279 | 413 | for(c = 0; c < UIP_CONNS; ++c) { |
hudakz | 0:5350a66d5279 | 414 | uip_conns[c].tcpstateflags = UIP_CLOSED; |
hudakz | 0:5350a66d5279 | 415 | } |
hudakz | 0:5350a66d5279 | 416 | |
hudakz | 0:5350a66d5279 | 417 | #if UIP_ACTIVE_OPEN |
hudakz | 0:5350a66d5279 | 418 | lastport = 1024; |
hudakz | 0:5350a66d5279 | 419 | #endif /* UIP_ACTIVE_OPEN */ |
hudakz | 0:5350a66d5279 | 420 | |
hudakz | 0:5350a66d5279 | 421 | #if UIP_UDP |
hudakz | 0:5350a66d5279 | 422 | for(c = 0; c < UIP_UDP_CONNS; ++c) { |
hudakz | 0:5350a66d5279 | 423 | uip_udp_conns[c].lport = 0; |
hudakz | 0:5350a66d5279 | 424 | } |
hudakz | 0:5350a66d5279 | 425 | #endif /* UIP_UDP */ |
hudakz | 0:5350a66d5279 | 426 | |
hudakz | 0:5350a66d5279 | 427 | /* IPv4 initialization. */ |
hudakz | 0:5350a66d5279 | 428 | |
hudakz | 0:5350a66d5279 | 429 | #if UIP_FIXEDADDR == 0 |
hudakz | 0:5350a66d5279 | 430 | /* uip_hostaddr[0] = uip_hostaddr[1] = 0;*/ |
hudakz | 0:5350a66d5279 | 431 | #endif /* UIP_FIXEDADDR */ |
hudakz | 0:5350a66d5279 | 432 | } |
hudakz | 0:5350a66d5279 | 433 | |
hudakz | 0:5350a66d5279 | 434 | /*---------------------------------------------------------------------------*/ |
hudakz | 0:5350a66d5279 | 435 | #if UIP_ACTIVE_OPEN |
hudakz | 0:5350a66d5279 | 436 | |
hudakz | 0:5350a66d5279 | 437 | /** |
hudakz | 0:5350a66d5279 | 438 | * @brief |
hudakz | 0:5350a66d5279 | 439 | * @note |
hudakz | 0:5350a66d5279 | 440 | * @param |
hudakz | 0:5350a66d5279 | 441 | * @retval |
hudakz | 0:5350a66d5279 | 442 | */ |
hudakz | 0:5350a66d5279 | 443 | struct uip_conn* uip_connect(uip_ipaddr_t* ripaddr, u16_t rport) { |
hudakz | 0:5350a66d5279 | 444 | register struct uip_conn* conn, *cconn; |
hudakz | 0:5350a66d5279 | 445 | |
hudakz | 0:5350a66d5279 | 446 | /* Find an unused local port. */ |
hudakz | 0:5350a66d5279 | 447 | |
hudakz | 0:5350a66d5279 | 448 | again: |
hudakz | 0:5350a66d5279 | 449 | ++lastport; |
hudakz | 0:5350a66d5279 | 450 | |
hudakz | 0:5350a66d5279 | 451 | if(lastport >= 32000) { |
hudakz | 0:5350a66d5279 | 452 | lastport = 4096; |
hudakz | 0:5350a66d5279 | 453 | } |
hudakz | 0:5350a66d5279 | 454 | |
hudakz | 0:5350a66d5279 | 455 | /* Check if this port is already in use, and if so try to find |
hudakz | 0:5350a66d5279 | 456 | another one. */ |
hudakz | 0:5350a66d5279 | 457 | for(c = 0; c < UIP_CONNS; ++c) { |
hudakz | 0:5350a66d5279 | 458 | conn = &uip_conns[c]; |
hudakz | 0:5350a66d5279 | 459 | if(conn->tcpstateflags != UIP_CLOSED && conn->lport == htons(lastport)) { |
hudakz | 0:5350a66d5279 | 460 | goto again; |
hudakz | 0:5350a66d5279 | 461 | } |
hudakz | 0:5350a66d5279 | 462 | } |
hudakz | 0:5350a66d5279 | 463 | |
hudakz | 0:5350a66d5279 | 464 | conn = 0; |
hudakz | 0:5350a66d5279 | 465 | for(c = 0; c < UIP_CONNS; ++c) { |
hudakz | 0:5350a66d5279 | 466 | cconn = &uip_conns[c]; |
hudakz | 0:5350a66d5279 | 467 | if(cconn->tcpstateflags == UIP_CLOSED) { |
hudakz | 0:5350a66d5279 | 468 | conn = cconn; |
hudakz | 0:5350a66d5279 | 469 | break; |
hudakz | 0:5350a66d5279 | 470 | } |
hudakz | 0:5350a66d5279 | 471 | |
hudakz | 0:5350a66d5279 | 472 | if(cconn->tcpstateflags == UIP_TIME_WAIT) { |
hudakz | 0:5350a66d5279 | 473 | if(conn == 0 || cconn->timer > conn->timer) { |
hudakz | 0:5350a66d5279 | 474 | conn = cconn; |
hudakz | 0:5350a66d5279 | 475 | } |
hudakz | 0:5350a66d5279 | 476 | } |
hudakz | 0:5350a66d5279 | 477 | } |
hudakz | 0:5350a66d5279 | 478 | |
hudakz | 0:5350a66d5279 | 479 | if(conn == 0) { |
hudakz | 0:5350a66d5279 | 480 | return 0; |
hudakz | 0:5350a66d5279 | 481 | } |
hudakz | 0:5350a66d5279 | 482 | |
hudakz | 0:5350a66d5279 | 483 | conn->tcpstateflags = UIP_SYN_SENT; |
hudakz | 0:5350a66d5279 | 484 | |
hudakz | 0:5350a66d5279 | 485 | conn->snd_nxt[0] = iss[0]; |
hudakz | 0:5350a66d5279 | 486 | conn->snd_nxt[1] = iss[1]; |
hudakz | 0:5350a66d5279 | 487 | conn->snd_nxt[2] = iss[2]; |
hudakz | 0:5350a66d5279 | 488 | conn->snd_nxt[3] = iss[3]; |
hudakz | 0:5350a66d5279 | 489 | |
hudakz | 0:5350a66d5279 | 490 | conn->initialmss = conn->mss = UIP_TCP_MSS; |
hudakz | 0:5350a66d5279 | 491 | |
hudakz | 0:5350a66d5279 | 492 | conn->len = 1; /* TCP length of the SYN is one. */ |
hudakz | 0:5350a66d5279 | 493 | conn->nrtx = 0; |
hudakz | 0:5350a66d5279 | 494 | conn->timer = 1; /* Send the SYN next time around. */ |
hudakz | 0:5350a66d5279 | 495 | conn->rto = UIP_RTO; |
hudakz | 0:5350a66d5279 | 496 | conn->sa = 0; |
hudakz | 0:5350a66d5279 | 497 | conn->sv = 16; /* Initial value of the RTT variance. */ |
hudakz | 0:5350a66d5279 | 498 | conn->lport = htons(lastport); |
hudakz | 0:5350a66d5279 | 499 | conn->rport = rport; |
hudakz | 0:5350a66d5279 | 500 | uip_ipaddr_copy(&conn->ripaddr, ripaddr); |
hudakz | 0:5350a66d5279 | 501 | |
hudakz | 0:5350a66d5279 | 502 | return conn; |
hudakz | 0:5350a66d5279 | 503 | } |
hudakz | 0:5350a66d5279 | 504 | #endif /* UIP_ACTIVE_OPEN */ |
hudakz | 0:5350a66d5279 | 505 | |
hudakz | 0:5350a66d5279 | 506 | /*---------------------------------------------------------------------------*/ |
hudakz | 0:5350a66d5279 | 507 | |
hudakz | 0:5350a66d5279 | 508 | #if UIP_UDP |
hudakz | 0:5350a66d5279 | 509 | |
hudakz | 0:5350a66d5279 | 510 | /** |
hudakz | 0:5350a66d5279 | 511 | * @brief |
hudakz | 0:5350a66d5279 | 512 | * @note |
hudakz | 0:5350a66d5279 | 513 | * @param |
hudakz | 0:5350a66d5279 | 514 | * @retval |
hudakz | 0:5350a66d5279 | 515 | */ |
hudakz | 0:5350a66d5279 | 516 | struct uip_udp_conn* uip_udp_new(uip_ipaddr_t* ripaddr, u16_t rport) { |
hudakz | 0:5350a66d5279 | 517 | register struct uip_udp_conn* conn; |
hudakz | 0:5350a66d5279 | 518 | |
hudakz | 0:5350a66d5279 | 519 | /* Find an unused local port. */ |
hudakz | 0:5350a66d5279 | 520 | |
hudakz | 0:5350a66d5279 | 521 | again: |
hudakz | 0:5350a66d5279 | 522 | ++lastport; |
hudakz | 0:5350a66d5279 | 523 | |
hudakz | 0:5350a66d5279 | 524 | if(lastport >= 32000) { |
hudakz | 0:5350a66d5279 | 525 | lastport = 4096; |
hudakz | 0:5350a66d5279 | 526 | } |
hudakz | 0:5350a66d5279 | 527 | |
hudakz | 0:5350a66d5279 | 528 | for(c = 0; c < UIP_UDP_CONNS; ++c) { |
hudakz | 0:5350a66d5279 | 529 | if(uip_udp_conns[c].lport == htons(lastport)) { |
hudakz | 0:5350a66d5279 | 530 | goto again; |
hudakz | 0:5350a66d5279 | 531 | } |
hudakz | 0:5350a66d5279 | 532 | } |
hudakz | 0:5350a66d5279 | 533 | |
hudakz | 0:5350a66d5279 | 534 | conn = 0; |
hudakz | 0:5350a66d5279 | 535 | for(c = 0; c < UIP_UDP_CONNS; ++c) { |
hudakz | 0:5350a66d5279 | 536 | if(uip_udp_conns[c].lport == 0) { |
hudakz | 0:5350a66d5279 | 537 | conn = &uip_udp_conns[c]; |
hudakz | 0:5350a66d5279 | 538 | break; |
hudakz | 0:5350a66d5279 | 539 | } |
hudakz | 0:5350a66d5279 | 540 | } |
hudakz | 0:5350a66d5279 | 541 | |
hudakz | 0:5350a66d5279 | 542 | if(conn == 0) { |
hudakz | 0:5350a66d5279 | 543 | return 0; |
hudakz | 0:5350a66d5279 | 544 | } |
hudakz | 0:5350a66d5279 | 545 | |
hudakz | 0:5350a66d5279 | 546 | conn->lport = HTONS(lastport); |
hudakz | 0:5350a66d5279 | 547 | conn->rport = rport; |
hudakz | 0:5350a66d5279 | 548 | if(ripaddr == NULL) { |
hudakz | 0:5350a66d5279 | 549 | memset(conn->ripaddr, 0, sizeof(uip_ipaddr_t)); |
hudakz | 0:5350a66d5279 | 550 | } |
hudakz | 0:5350a66d5279 | 551 | else { |
hudakz | 0:5350a66d5279 | 552 | uip_ipaddr_copy(&conn->ripaddr, ripaddr); |
hudakz | 0:5350a66d5279 | 553 | } |
hudakz | 0:5350a66d5279 | 554 | |
hudakz | 0:5350a66d5279 | 555 | conn->ttl = UIP_TTL; |
hudakz | 0:5350a66d5279 | 556 | |
hudakz | 0:5350a66d5279 | 557 | return conn; |
hudakz | 0:5350a66d5279 | 558 | } |
hudakz | 0:5350a66d5279 | 559 | #endif /* UIP_UDP */ |
hudakz | 0:5350a66d5279 | 560 | |
hudakz | 0:5350a66d5279 | 561 | /*---------------------------------------------------------------------------*/ |
hudakz | 0:5350a66d5279 | 562 | void uip_unlisten(u16_t port) { |
hudakz | 0:5350a66d5279 | 563 | for(c = 0; c < UIP_LISTENPORTS; ++c) { |
hudakz | 0:5350a66d5279 | 564 | if(uip_listenports[c] == port) { |
hudakz | 0:5350a66d5279 | 565 | uip_listenports[c] = 0; |
hudakz | 0:5350a66d5279 | 566 | return; |
hudakz | 0:5350a66d5279 | 567 | } |
hudakz | 0:5350a66d5279 | 568 | } |
hudakz | 0:5350a66d5279 | 569 | } |
hudakz | 0:5350a66d5279 | 570 | |
hudakz | 0:5350a66d5279 | 571 | /*---------------------------------------------------------------------------*/ |
hudakz | 0:5350a66d5279 | 572 | void uip_listen(u16_t port) { |
hudakz | 0:5350a66d5279 | 573 | for(c = 0; c < UIP_LISTENPORTS; ++c) { |
hudakz | 0:5350a66d5279 | 574 | if(uip_listenports[c] == 0) { |
hudakz | 0:5350a66d5279 | 575 | uip_listenports[c] = port; |
hudakz | 0:5350a66d5279 | 576 | return; |
hudakz | 0:5350a66d5279 | 577 | } |
hudakz | 0:5350a66d5279 | 578 | } |
hudakz | 0:5350a66d5279 | 579 | } |
hudakz | 0:5350a66d5279 | 580 | |
hudakz | 0:5350a66d5279 | 581 | /*---------------------------------------------------------------------------*/ |
hudakz | 0:5350a66d5279 | 582 | /* XXX: IP fragment reassembly: not well-tested. */ |
hudakz | 0:5350a66d5279 | 583 | #if UIP_REASSEMBLY && !UIP_CONF_IPV6 |
hudakz | 0:5350a66d5279 | 584 | #define UIP_REASS_BUFSIZE (UIP_BUFSIZE - UIP_LLH_LEN) |
hudakz | 0:5350a66d5279 | 585 | static u8_t uip_reassbuf[UIP_REASS_BUFSIZE]; |
hudakz | 0:5350a66d5279 | 586 | static u8_t uip_reassbitmap[UIP_REASS_BUFSIZE / (8 * 8)]; |
hudakz | 0:5350a66d5279 | 587 | static const u8_t bitmap_bits[8] = { 0xff, 0x7f, 0x3f, 0x1f, 0x0f, 0x07, 0x03, 0x01 }; |
hudakz | 0:5350a66d5279 | 588 | static u16_t uip_reasslen; |
hudakz | 0:5350a66d5279 | 589 | static u8_t uip_reassflags; |
hudakz | 0:5350a66d5279 | 590 | #define UIP_REASS_FLAG_LASTFRAG 0x01 |
hudakz | 0:5350a66d5279 | 591 | static u8_t uip_reasstmr; |
hudakz | 0:5350a66d5279 | 592 | |
hudakz | 0:5350a66d5279 | 593 | #define IP_MF 0x20 |
hudakz | 0:5350a66d5279 | 594 | |
hudakz | 0:5350a66d5279 | 595 | /** |
hudakz | 0:5350a66d5279 | 596 | * @brief |
hudakz | 0:5350a66d5279 | 597 | * @note |
hudakz | 0:5350a66d5279 | 598 | * @param |
hudakz | 0:5350a66d5279 | 599 | * @retval |
hudakz | 0:5350a66d5279 | 600 | */ |
hudakz | 0:5350a66d5279 | 601 | static u8_t uip_reass(void) { |
hudakz | 0:5350a66d5279 | 602 | u16_t offset, len; |
hudakz | 0:5350a66d5279 | 603 | u16_t i; |
hudakz | 0:5350a66d5279 | 604 | |
hudakz | 0:5350a66d5279 | 605 | /* If ip_reasstmr is zero, no packet is present in the buffer, so we |
hudakz | 0:5350a66d5279 | 606 | write the IP header of the fragment into the reassembly |
hudakz | 0:5350a66d5279 | 607 | buffer. The timer is updated with the maximum age. */ |
hudakz | 0:5350a66d5279 | 608 | |
hudakz | 0:5350a66d5279 | 609 | if(uip_reasstmr == 0) { |
hudakz | 0:5350a66d5279 | 610 | memcpy(uip_reassbuf, &BUF->vhl, UIP_IPH_LEN); |
hudakz | 0:5350a66d5279 | 611 | uip_reasstmr = UIP_REASS_MAXAGE; |
hudakz | 0:5350a66d5279 | 612 | uip_reassflags = 0; |
hudakz | 0:5350a66d5279 | 613 | |
hudakz | 0:5350a66d5279 | 614 | /* Clear the bitmap. */ |
hudakz | 0:5350a66d5279 | 615 | memset(uip_reassbitmap, 0, sizeof(uip_reassbitmap)); |
hudakz | 0:5350a66d5279 | 616 | } |
hudakz | 0:5350a66d5279 | 617 | |
hudakz | 0:5350a66d5279 | 618 | /* Check if the incoming fragment matches the one currently present |
hudakz | 0:5350a66d5279 | 619 | in the reasembly buffer. If so, we proceed with copying the |
hudakz | 0:5350a66d5279 | 620 | fragment into the buffer. */ |
hudakz | 0:5350a66d5279 | 621 | if |
hudakz | 0:5350a66d5279 | 622 | ( |
hudakz | 0:5350a66d5279 | 623 | BUF->srcipaddr[0] == FBUF->srcipaddr[0] |
hudakz | 0:5350a66d5279 | 624 | && BUF->srcipaddr[1] == FBUF->srcipaddr[1] |
hudakz | 0:5350a66d5279 | 625 | && BUF->destipaddr[0] == FBUF->destipaddr[0] |
hudakz | 0:5350a66d5279 | 626 | && BUF->destipaddr[1] == FBUF->destipaddr[1] |
hudakz | 0:5350a66d5279 | 627 | && BUF->ipid[0] == FBUF->ipid[0] |
hudakz | 0:5350a66d5279 | 628 | && BUF->ipid[1] == FBUF->ipid[1] |
hudakz | 0:5350a66d5279 | 629 | ) { |
hudakz | 0:5350a66d5279 | 630 | len = (BUF->len[0] << 8) + BUF->len[1] - (BUF->vhl & 0x0f) * 4; |
hudakz | 0:5350a66d5279 | 631 | offset = (((BUF->ipoffset[0] & 0x3f) << 8) + BUF->ipoffset[1]) * 8; |
hudakz | 0:5350a66d5279 | 632 | |
hudakz | 0:5350a66d5279 | 633 | /* If the offset or the offset + fragment length overflows the |
hudakz | 0:5350a66d5279 | 634 | reassembly buffer, we discard the entire packet. */ |
hudakz | 0:5350a66d5279 | 635 | if(offset > UIP_REASS_BUFSIZE || offset + len > UIP_REASS_BUFSIZE) { |
hudakz | 0:5350a66d5279 | 636 | uip_reasstmr = 0; |
hudakz | 0:5350a66d5279 | 637 | goto nullreturn; |
hudakz | 0:5350a66d5279 | 638 | } |
hudakz | 0:5350a66d5279 | 639 | |
hudakz | 0:5350a66d5279 | 640 | /* Copy the fragment into the reassembly buffer, at the right |
hudakz | 0:5350a66d5279 | 641 | offset. */ |
hudakz | 0:5350a66d5279 | 642 | memcpy(&uip_reassbuf[UIP_IPH_LEN + offset], (char*)BUF + (int)((BUF->vhl & 0x0f) * 4), len); |
hudakz | 0:5350a66d5279 | 643 | |
hudakz | 0:5350a66d5279 | 644 | /* Update the bitmap. */ |
hudakz | 0:5350a66d5279 | 645 | if(offset / (8 * 8) == (offset + len) / (8 * 8)) { |
hudakz | 0:5350a66d5279 | 646 | |
hudakz | 0:5350a66d5279 | 647 | /* If the two endpoints are in the same byte, we only update |
hudakz | 0:5350a66d5279 | 648 | that byte. */ |
hudakz | 0:5350a66d5279 | 649 | uip_reassbitmap[offset / (8 * 8)] |= bitmap_bits[(offset / 8) & 7] &~bitmap_bits[((offset + len) / 8) & 7]; |
hudakz | 0:5350a66d5279 | 650 | } |
hudakz | 0:5350a66d5279 | 651 | else { |
hudakz | 0:5350a66d5279 | 652 | |
hudakz | 0:5350a66d5279 | 653 | /* If the two endpoints are in different bytes, we update the |
hudakz | 0:5350a66d5279 | 654 | bytes in the endpoints and fill the stuff inbetween with |
hudakz | 0:5350a66d5279 | 655 | 0xff. */ |
hudakz | 0:5350a66d5279 | 656 | uip_reassbitmap[offset / (8 * 8)] |= bitmap_bits[(offset / 8) & 7]; |
hudakz | 0:5350a66d5279 | 657 | for(i = 1 + offset / (8 * 8); i < (offset + len) / (8 * 8); ++i) { |
hudakz | 0:5350a66d5279 | 658 | uip_reassbitmap[i] = 0xff; |
hudakz | 0:5350a66d5279 | 659 | } |
hudakz | 0:5350a66d5279 | 660 | |
hudakz | 0:5350a66d5279 | 661 | uip_reassbitmap[(offset + len) / (8 * 8)] |= ~bitmap_bits[((offset + len) / 8) & 7]; |
hudakz | 0:5350a66d5279 | 662 | } |
hudakz | 0:5350a66d5279 | 663 | |
hudakz | 0:5350a66d5279 | 664 | /* If this fragment has the More Fragments flag set to zero, we |
hudakz | 0:5350a66d5279 | 665 | know that this is the last fragment, so we can calculate the |
hudakz | 0:5350a66d5279 | 666 | size of the entire packet. We also set the |
hudakz | 0:5350a66d5279 | 667 | IP_REASS_FLAG_LASTFRAG flag to indicate that we have received |
hudakz | 0:5350a66d5279 | 668 | the final fragment. */ |
hudakz | 0:5350a66d5279 | 669 | if((BUF->ipoffset[0] & IP_MF) == 0) { |
hudakz | 0:5350a66d5279 | 670 | uip_reassflags |= UIP_REASS_FLAG_LASTFRAG; |
hudakz | 0:5350a66d5279 | 671 | uip_reasslen = offset + len; |
hudakz | 0:5350a66d5279 | 672 | } |
hudakz | 0:5350a66d5279 | 673 | |
hudakz | 0:5350a66d5279 | 674 | /* Finally, we check if we have a full packet in the buffer. We do |
hudakz | 0:5350a66d5279 | 675 | this by checking if we have the last fragment and if all bits |
hudakz | 0:5350a66d5279 | 676 | in the bitmap are set. */ |
hudakz | 0:5350a66d5279 | 677 | if(uip_reassflags & UIP_REASS_FLAG_LASTFRAG) { |
hudakz | 0:5350a66d5279 | 678 | |
hudakz | 0:5350a66d5279 | 679 | /* Check all bytes up to and including all but the last byte in |
hudakz | 0:5350a66d5279 | 680 | the bitmap. */ |
hudakz | 0:5350a66d5279 | 681 | for(i = 0; i < uip_reasslen / (8 * 8) - 1; ++i) { |
hudakz | 0:5350a66d5279 | 682 | if(uip_reassbitmap[i] != 0xff) { |
hudakz | 0:5350a66d5279 | 683 | goto nullreturn; |
hudakz | 0:5350a66d5279 | 684 | } |
hudakz | 0:5350a66d5279 | 685 | } |
hudakz | 0:5350a66d5279 | 686 | |
hudakz | 0:5350a66d5279 | 687 | /* Check the last byte in the bitmap. It should contain just the |
hudakz | 0:5350a66d5279 | 688 | right amount of bits. */ |
hudakz | 0:5350a66d5279 | 689 | if(uip_reassbitmap[uip_reasslen / (8 * 8)] != (u8_t)~bitmap_bits[uip_reasslen / 8 & 7]) { |
hudakz | 0:5350a66d5279 | 690 | goto nullreturn; |
hudakz | 0:5350a66d5279 | 691 | } |
hudakz | 0:5350a66d5279 | 692 | |
hudakz | 0:5350a66d5279 | 693 | /* If we have come this far, we have a full packet in the |
hudakz | 0:5350a66d5279 | 694 | buffer, so we allocate a pbuf and copy the packet into it. We |
hudakz | 0:5350a66d5279 | 695 | also reset the timer. */ |
hudakz | 0:5350a66d5279 | 696 | uip_reasstmr = 0; |
hudakz | 0:5350a66d5279 | 697 | memcpy(BUF, FBUF, uip_reasslen); |
hudakz | 0:5350a66d5279 | 698 | |
hudakz | 0:5350a66d5279 | 699 | /* Pretend to be a "normal" (i.e., not fragmented) IP packet |
hudakz | 0:5350a66d5279 | 700 | from now on. */ |
hudakz | 0:5350a66d5279 | 701 | BUF->ipoffset[0] = BUF->ipoffset[1] = 0; |
hudakz | 0:5350a66d5279 | 702 | BUF->len[0] = uip_reasslen >> 8; |
hudakz | 0:5350a66d5279 | 703 | BUF->len[1] = uip_reasslen & 0xff; |
hudakz | 0:5350a66d5279 | 704 | BUF->ipchksum = 0; |
hudakz | 0:5350a66d5279 | 705 | BUF->ipchksum = ~(uip_ipchksum()); |
hudakz | 0:5350a66d5279 | 706 | |
hudakz | 0:5350a66d5279 | 707 | return uip_reasslen; |
hudakz | 0:5350a66d5279 | 708 | } |
hudakz | 0:5350a66d5279 | 709 | } |
hudakz | 0:5350a66d5279 | 710 | |
hudakz | 0:5350a66d5279 | 711 | nullreturn: |
hudakz | 0:5350a66d5279 | 712 | return 0; |
hudakz | 0:5350a66d5279 | 713 | } |
hudakz | 0:5350a66d5279 | 714 | #endif /* UIP_REASSEMBLY */ |
hudakz | 0:5350a66d5279 | 715 | |
hudakz | 0:5350a66d5279 | 716 | /*---------------------------------------------------------------------------*/ |
hudakz | 0:5350a66d5279 | 717 | static void uip_add_rcv_nxt(u16_t n) { |
hudakz | 0:5350a66d5279 | 718 | uip_add32(uip_conn->rcv_nxt, n); |
hudakz | 0:5350a66d5279 | 719 | uip_conn->rcv_nxt[0] = uip_acc32[0]; |
hudakz | 0:5350a66d5279 | 720 | uip_conn->rcv_nxt[1] = uip_acc32[1]; |
hudakz | 0:5350a66d5279 | 721 | uip_conn->rcv_nxt[2] = uip_acc32[2]; |
hudakz | 0:5350a66d5279 | 722 | uip_conn->rcv_nxt[3] = uip_acc32[3]; |
hudakz | 0:5350a66d5279 | 723 | } |
hudakz | 0:5350a66d5279 | 724 | |
hudakz | 0:5350a66d5279 | 725 | /*---------------------------------------------------------------------------*/ |
hudakz | 0:5350a66d5279 | 726 | void uip_process(u8_t flag) { |
hudakz | 0:5350a66d5279 | 727 | register struct uip_conn* uip_connr = uip_conn; |
hudakz | 0:5350a66d5279 | 728 | |
hudakz | 0:5350a66d5279 | 729 | #if UIP_UDP |
hudakz | 0:5350a66d5279 | 730 | if(flag == UIP_UDP_SEND_CONN) { |
hudakz | 0:5350a66d5279 | 731 | goto udp_send; |
hudakz | 0:5350a66d5279 | 732 | } |
hudakz | 0:5350a66d5279 | 733 | #endif /* UIP_UDP */ |
hudakz | 0:5350a66d5279 | 734 | |
hudakz | 0:5350a66d5279 | 735 | uip_sappdata = uip_appdata = &uip_buf[UIP_IPTCPH_LEN + UIP_LLH_LEN]; |
hudakz | 0:5350a66d5279 | 736 | |
hudakz | 0:5350a66d5279 | 737 | /* Check if we were invoked because of a poll request for a |
hudakz | 0:5350a66d5279 | 738 | particular connection. */ |
hudakz | 0:5350a66d5279 | 739 | if(flag == UIP_POLL_REQUEST) { |
hudakz | 0:5350a66d5279 | 740 | if((uip_connr->tcpstateflags & UIP_TS_MASK) == UIP_ESTABLISHED && !uip_outstanding(uip_connr)) { |
hudakz | 0:5350a66d5279 | 741 | uip_flags = UIP_POLL; |
hudakz | 0:5350a66d5279 | 742 | UIP_APPCALL(); |
hudakz | 0:5350a66d5279 | 743 | goto appsend; |
hudakz | 0:5350a66d5279 | 744 | } |
hudakz | 0:5350a66d5279 | 745 | |
hudakz | 0:5350a66d5279 | 746 | goto drop; |
hudakz | 0:5350a66d5279 | 747 | |
hudakz | 0:5350a66d5279 | 748 | /* Check if we were invoked because of the perodic timer fireing. */ |
hudakz | 0:5350a66d5279 | 749 | } |
hudakz | 0:5350a66d5279 | 750 | else |
hudakz | 0:5350a66d5279 | 751 | if(flag == UIP_TIMER) |
hudakz | 0:5350a66d5279 | 752 | { |
hudakz | 0:5350a66d5279 | 753 | #if UIP_REASSEMBLY |
hudakz | 0:5350a66d5279 | 754 | if(uip_reasstmr != 0) { |
hudakz | 0:5350a66d5279 | 755 | --uip_reasstmr; |
hudakz | 0:5350a66d5279 | 756 | } |
hudakz | 0:5350a66d5279 | 757 | #endif /* UIP_REASSEMBLY */ |
hudakz | 0:5350a66d5279 | 758 | |
hudakz | 0:5350a66d5279 | 759 | /* Increase the initial sequence number. */ |
hudakz | 0:5350a66d5279 | 760 | |
hudakz | 0:5350a66d5279 | 761 | if(++iss[3] == 0) { |
hudakz | 0:5350a66d5279 | 762 | if(++iss[2] == 0) { |
hudakz | 0:5350a66d5279 | 763 | if(++iss[1] == 0) { |
hudakz | 0:5350a66d5279 | 764 | ++iss[0]; |
hudakz | 0:5350a66d5279 | 765 | } |
hudakz | 0:5350a66d5279 | 766 | } |
hudakz | 0:5350a66d5279 | 767 | } |
hudakz | 0:5350a66d5279 | 768 | |
hudakz | 0:5350a66d5279 | 769 | /* Reset the length variables. */ |
hudakz | 0:5350a66d5279 | 770 | uip_len = 0; |
hudakz | 0:5350a66d5279 | 771 | uip_slen = 0; |
hudakz | 0:5350a66d5279 | 772 | |
hudakz | 0:5350a66d5279 | 773 | /* Check if the connection is in a state in which we simply wait |
hudakz | 0:5350a66d5279 | 774 | for the connection to time out. If so, we increase the |
hudakz | 0:5350a66d5279 | 775 | connection's timer and remove the connection if it times |
hudakz | 0:5350a66d5279 | 776 | out. */ |
hudakz | 0:5350a66d5279 | 777 | if(uip_connr->tcpstateflags == UIP_TIME_WAIT || uip_connr->tcpstateflags == UIP_FIN_WAIT_2) { |
hudakz | 0:5350a66d5279 | 778 | ++(uip_connr->timer); |
hudakz | 0:5350a66d5279 | 779 | if(uip_connr->timer == UIP_TIME_WAIT_TIMEOUT) { |
hudakz | 0:5350a66d5279 | 780 | uip_connr->tcpstateflags = UIP_CLOSED; |
hudakz | 0:5350a66d5279 | 781 | } |
hudakz | 0:5350a66d5279 | 782 | } |
hudakz | 0:5350a66d5279 | 783 | else |
hudakz | 0:5350a66d5279 | 784 | if(uip_connr->tcpstateflags != UIP_CLOSED) { |
hudakz | 0:5350a66d5279 | 785 | |
hudakz | 0:5350a66d5279 | 786 | /* If the connection has outstanding data, we increase the |
hudakz | 0:5350a66d5279 | 787 | connection's timer and see if it has reached the RTO value |
hudakz | 0:5350a66d5279 | 788 | in which case we retransmit. */ |
hudakz | 0:5350a66d5279 | 789 | if(uip_outstanding(uip_connr)) { |
hudakz | 0:5350a66d5279 | 790 | if(uip_connr->timer-- == 0) { |
hudakz | 0:5350a66d5279 | 791 | if |
hudakz | 0:5350a66d5279 | 792 | ( |
hudakz | 0:5350a66d5279 | 793 | uip_connr->nrtx == UIP_MAXRTX |
hudakz | 0:5350a66d5279 | 794 | || ( |
hudakz | 0:5350a66d5279 | 795 | (uip_connr->tcpstateflags == UIP_SYN_SENT || uip_connr->tcpstateflags == UIP_SYN_RCVD) |
hudakz | 0:5350a66d5279 | 796 | && uip_connr->nrtx == UIP_MAXSYNRTX |
hudakz | 0:5350a66d5279 | 797 | ) |
hudakz | 0:5350a66d5279 | 798 | ) { |
hudakz | 0:5350a66d5279 | 799 | uip_connr->tcpstateflags = UIP_CLOSED; |
hudakz | 0:5350a66d5279 | 800 | |
hudakz | 0:5350a66d5279 | 801 | /* We call UIP_APPCALL() with uip_flags set to |
hudakz | 0:5350a66d5279 | 802 | UIP_TIMEDOUT to inform the application that the |
hudakz | 0:5350a66d5279 | 803 | connection has timed out. */ |
hudakz | 0:5350a66d5279 | 804 | uip_flags = UIP_TIMEDOUT; |
hudakz | 0:5350a66d5279 | 805 | UIP_APPCALL(); |
hudakz | 0:5350a66d5279 | 806 | |
hudakz | 0:5350a66d5279 | 807 | /* We also send a reset packet to the remote host. */ |
hudakz | 0:5350a66d5279 | 808 | BUF->flags = TCP_RST | TCP_ACK; |
hudakz | 0:5350a66d5279 | 809 | goto tcp_send_nodata; |
hudakz | 0:5350a66d5279 | 810 | } |
hudakz | 0:5350a66d5279 | 811 | |
hudakz | 0:5350a66d5279 | 812 | /* Exponential backoff. */ |
hudakz | 0:5350a66d5279 | 813 | uip_connr->timer = UIP_RTO << (uip_connr->nrtx > 4 ? 4 : uip_connr->nrtx); |
hudakz | 0:5350a66d5279 | 814 | ++(uip_connr->nrtx); |
hudakz | 0:5350a66d5279 | 815 | |
hudakz | 0:5350a66d5279 | 816 | /* Ok, so we need to retransmit. We do this differently |
hudakz | 0:5350a66d5279 | 817 | depending on which state we are in. In ESTABLISHED, we |
hudakz | 0:5350a66d5279 | 818 | call upon the application so that it may prepare the |
hudakz | 0:5350a66d5279 | 819 | data for the retransmit. In SYN_RCVD, we resend the |
hudakz | 0:5350a66d5279 | 820 | SYNACK that we sent earlier and in LAST_ACK we have to |
hudakz | 0:5350a66d5279 | 821 | retransmit our FINACK. */ |
hudakz | 0:5350a66d5279 | 822 | UIP_STAT(++uip_stat.tcp.rexmit); |
hudakz | 0:5350a66d5279 | 823 | switch(uip_connr->tcpstateflags & UIP_TS_MASK) { |
hudakz | 0:5350a66d5279 | 824 | case UIP_SYN_RCVD: |
hudakz | 0:5350a66d5279 | 825 | /* In the SYN_RCVD state, we should retransmit our |
hudakz | 0:5350a66d5279 | 826 | SYNACK. */ |
hudakz | 0:5350a66d5279 | 827 | goto tcp_send_synack; |
hudakz | 0:5350a66d5279 | 828 | |
hudakz | 0:5350a66d5279 | 829 | #if UIP_ACTIVE_OPEN |
hudakz | 0:5350a66d5279 | 830 | |
hudakz | 0:5350a66d5279 | 831 | case UIP_SYN_SENT: |
hudakz | 0:5350a66d5279 | 832 | /* In the SYN_SENT state, we retransmit out SYN. */ |
hudakz | 0:5350a66d5279 | 833 | BUF->flags = 0; |
hudakz | 0:5350a66d5279 | 834 | goto tcp_send_syn; |
hudakz | 0:5350a66d5279 | 835 | #endif /* UIP_ACTIVE_OPEN */ |
hudakz | 0:5350a66d5279 | 836 | |
hudakz | 0:5350a66d5279 | 837 | case UIP_ESTABLISHED: |
hudakz | 0:5350a66d5279 | 838 | /* In the ESTABLISHED state, we call upon the application |
hudakz | 0:5350a66d5279 | 839 | to do the actual retransmit after which we jump into |
hudakz | 0:5350a66d5279 | 840 | the code for sending out the packet (the apprexmit |
hudakz | 0:5350a66d5279 | 841 | label). */ |
hudakz | 0:5350a66d5279 | 842 | uip_flags = UIP_REXMIT; |
hudakz | 0:5350a66d5279 | 843 | UIP_APPCALL(); |
hudakz | 0:5350a66d5279 | 844 | goto apprexmit; |
hudakz | 0:5350a66d5279 | 845 | |
hudakz | 0:5350a66d5279 | 846 | case UIP_FIN_WAIT_1: |
hudakz | 0:5350a66d5279 | 847 | case UIP_CLOSING: |
hudakz | 0:5350a66d5279 | 848 | case UIP_LAST_ACK: |
hudakz | 0:5350a66d5279 | 849 | /* In all these states we should retransmit a FINACK. */ |
hudakz | 0:5350a66d5279 | 850 | goto tcp_send_finack; |
hudakz | 0:5350a66d5279 | 851 | } |
hudakz | 0:5350a66d5279 | 852 | } |
hudakz | 0:5350a66d5279 | 853 | } |
hudakz | 0:5350a66d5279 | 854 | else |
hudakz | 0:5350a66d5279 | 855 | if((uip_connr->tcpstateflags & UIP_TS_MASK) == UIP_ESTABLISHED) { |
hudakz | 0:5350a66d5279 | 856 | |
hudakz | 0:5350a66d5279 | 857 | /* If there was no need for a retransmission, we poll the |
hudakz | 0:5350a66d5279 | 858 | application for new data. */ |
hudakz | 0:5350a66d5279 | 859 | uip_flags = UIP_POLL; |
hudakz | 0:5350a66d5279 | 860 | UIP_APPCALL(); |
hudakz | 0:5350a66d5279 | 861 | goto appsend; |
hudakz | 0:5350a66d5279 | 862 | } |
hudakz | 0:5350a66d5279 | 863 | } |
hudakz | 0:5350a66d5279 | 864 | |
hudakz | 0:5350a66d5279 | 865 | goto drop; |
hudakz | 0:5350a66d5279 | 866 | } |
hudakz | 0:5350a66d5279 | 867 | |
hudakz | 0:5350a66d5279 | 868 | #if UIP_UDP |
hudakz | 0:5350a66d5279 | 869 | if(flag == UIP_UDP_TIMER) { |
hudakz | 0:5350a66d5279 | 870 | if(uip_udp_conn->lport != 0) { |
hudakz | 0:5350a66d5279 | 871 | uip_conn = NULL; |
hudakz | 0:5350a66d5279 | 872 | uip_sappdata = uip_appdata = &uip_buf[UIP_LLH_LEN + UIP_IPUDPH_LEN]; |
hudakz | 0:5350a66d5279 | 873 | uip_len = uip_slen = 0; |
hudakz | 0:5350a66d5279 | 874 | uip_flags = UIP_POLL; |
hudakz | 0:5350a66d5279 | 875 | UIP_UDP_APPCALL(); |
hudakz | 0:5350a66d5279 | 876 | goto udp_send; |
hudakz | 0:5350a66d5279 | 877 | } |
hudakz | 0:5350a66d5279 | 878 | else { |
hudakz | 0:5350a66d5279 | 879 | goto drop; |
hudakz | 0:5350a66d5279 | 880 | } |
hudakz | 0:5350a66d5279 | 881 | } |
hudakz | 0:5350a66d5279 | 882 | #endif |
hudakz | 0:5350a66d5279 | 883 | /* This is where the input processing starts. */ |
hudakz | 0:5350a66d5279 | 884 | |
hudakz | 0:5350a66d5279 | 885 | UIP_STAT(++uip_stat.ip.recv); |
hudakz | 0:5350a66d5279 | 886 | |
hudakz | 0:5350a66d5279 | 887 | /* Start of IP input header processing code. */ |
hudakz | 0:5350a66d5279 | 888 | #if UIP_CONF_IPV6 |
hudakz | 0:5350a66d5279 | 889 | /* Check validity of the IP header. */ |
hudakz | 0:5350a66d5279 | 890 | |
hudakz | 0:5350a66d5279 | 891 | if((BUF->vtc & 0xf0) != 0x60) { |
hudakz | 0:5350a66d5279 | 892 | |
hudakz | 0:5350a66d5279 | 893 | /* IP version and header length. */ |
hudakz | 0:5350a66d5279 | 894 | UIP_STAT(++uip_stat.ip.drop); |
hudakz | 0:5350a66d5279 | 895 | UIP_STAT(++uip_stat.ip.vhlerr); |
hudakz | 0:5350a66d5279 | 896 | UIP_LOG("ipv6: invalid version."); |
hudakz | 0:5350a66d5279 | 897 | goto drop; |
hudakz | 0:5350a66d5279 | 898 | } |
hudakz | 0:5350a66d5279 | 899 | |
hudakz | 0:5350a66d5279 | 900 | #else /* UIP_CONF_IPV6 */ |
hudakz | 0:5350a66d5279 | 901 | /* Check validity of the IP header. */ |
hudakz | 0:5350a66d5279 | 902 | |
hudakz | 0:5350a66d5279 | 903 | if(BUF->vhl != 0x45) { |
hudakz | 0:5350a66d5279 | 904 | |
hudakz | 0:5350a66d5279 | 905 | /* IP version and header length. */ |
hudakz | 0:5350a66d5279 | 906 | UIP_STAT(++uip_stat.ip.drop); |
hudakz | 0:5350a66d5279 | 907 | UIP_STAT(++uip_stat.ip.vhlerr); |
hudakz | 0:5350a66d5279 | 908 | UIP_LOG("ip: invalid version or header length."); |
hudakz | 0:5350a66d5279 | 909 | goto drop; |
hudakz | 0:5350a66d5279 | 910 | } |
hudakz | 0:5350a66d5279 | 911 | #endif /* UIP_CONF_IPV6 */ |
hudakz | 0:5350a66d5279 | 912 | |
hudakz | 0:5350a66d5279 | 913 | /* Check the size of the packet. If the size reported to us in |
hudakz | 0:5350a66d5279 | 914 | uip_len is smaller the size reported in the IP header, we assume |
hudakz | 0:5350a66d5279 | 915 | that the packet has been corrupted in transit. If the size of |
hudakz | 0:5350a66d5279 | 916 | uip_len is larger than the size reported in the IP packet header, |
hudakz | 0:5350a66d5279 | 917 | the packet has been padded and we set uip_len to the correct |
hudakz | 0:5350a66d5279 | 918 | value.. */ |
hudakz | 0:5350a66d5279 | 919 | |
hudakz | 0:5350a66d5279 | 920 | if((BUF->len[0] << 8) + BUF->len[1] <= uip_len) { |
hudakz | 0:5350a66d5279 | 921 | uip_len = (BUF->len[0] << 8) + BUF->len[1]; |
hudakz | 0:5350a66d5279 | 922 | #if UIP_CONF_IPV6 |
hudakz | 0:5350a66d5279 | 923 | uip_len += 40; /* The length reported in the IPv6 header is the |
hudakz | 0:5350a66d5279 | 924 | length of the payload that follows the |
hudakz | 0:5350a66d5279 | 925 | header. However, uIP uses the uip_len variable |
hudakz | 0:5350a66d5279 | 926 | for holding the size of the entire packet, |
hudakz | 0:5350a66d5279 | 927 | including the IP header. For IPv4 this is not a |
hudakz | 0:5350a66d5279 | 928 | problem as the length field in the IPv4 header |
hudakz | 0:5350a66d5279 | 929 | contains the length of the entire packet. But |
hudakz | 0:5350a66d5279 | 930 | for IPv6 we need to add the size of the IPv6 |
hudakz | 0:5350a66d5279 | 931 | header (40 bytes). */ |
hudakz | 0:5350a66d5279 | 932 | #endif /* UIP_CONF_IPV6 */ |
hudakz | 0:5350a66d5279 | 933 | } |
hudakz | 0:5350a66d5279 | 934 | else { |
hudakz | 0:5350a66d5279 | 935 | UIP_LOG("ip: packet shorter than reported in IP header."); |
hudakz | 0:5350a66d5279 | 936 | goto drop; |
hudakz | 0:5350a66d5279 | 937 | } |
hudakz | 0:5350a66d5279 | 938 | |
hudakz | 0:5350a66d5279 | 939 | #if !UIP_CONF_IPV6 |
hudakz | 0:5350a66d5279 | 940 | /* Check the fragment flag. */ |
hudakz | 0:5350a66d5279 | 941 | |
hudakz | 0:5350a66d5279 | 942 | if((BUF->ipoffset[0] & 0x3f) != 0 || BUF->ipoffset[1] != 0) |
hudakz | 0:5350a66d5279 | 943 | { |
hudakz | 0:5350a66d5279 | 944 | #if UIP_REASSEMBLY |
hudakz | 0:5350a66d5279 | 945 | uip_len = uip_reass(); |
hudakz | 0:5350a66d5279 | 946 | if(uip_len == 0) { |
hudakz | 0:5350a66d5279 | 947 | goto drop; |
hudakz | 0:5350a66d5279 | 948 | } |
hudakz | 0:5350a66d5279 | 949 | |
hudakz | 0:5350a66d5279 | 950 | #else /* UIP_REASSEMBLY */ |
hudakz | 0:5350a66d5279 | 951 | UIP_STAT(++uip_stat.ip.drop); |
hudakz | 0:5350a66d5279 | 952 | UIP_STAT(++uip_stat.ip.fragerr); |
hudakz | 0:5350a66d5279 | 953 | UIP_LOG("ip: fragment dropped."); |
hudakz | 0:5350a66d5279 | 954 | goto drop; |
hudakz | 0:5350a66d5279 | 955 | #endif /* UIP_REASSEMBLY */ |
hudakz | 0:5350a66d5279 | 956 | } |
hudakz | 0:5350a66d5279 | 957 | #endif /* UIP_CONF_IPV6 */ |
hudakz | 0:5350a66d5279 | 958 | |
hudakz | 0:5350a66d5279 | 959 | if(uip_ipaddr_cmp(uip_hostaddr, all_zeroes_addr)) |
hudakz | 0:5350a66d5279 | 960 | { |
hudakz | 0:5350a66d5279 | 961 | /* If we are configured to use ping IP address configuration and |
hudakz | 0:5350a66d5279 | 962 | hasn't been assigned an IP address yet, we accept all ICMP |
hudakz | 0:5350a66d5279 | 963 | packets. */ |
hudakz | 0:5350a66d5279 | 964 | #if UIP_PINGADDRCONF && !UIP_CONF_IPV6 |
hudakz | 0:5350a66d5279 | 965 | if(BUF->proto == UIP_PROTO_ICMP) { |
hudakz | 0:5350a66d5279 | 966 | UIP_LOG("ip: possible ping config packet received."); |
hudakz | 0:5350a66d5279 | 967 | goto icmp_input; |
hudakz | 0:5350a66d5279 | 968 | } |
hudakz | 0:5350a66d5279 | 969 | else { |
hudakz | 0:5350a66d5279 | 970 | UIP_LOG("ip: packet dropped since no address assigned."); |
hudakz | 0:5350a66d5279 | 971 | goto drop; |
hudakz | 0:5350a66d5279 | 972 | } |
hudakz | 0:5350a66d5279 | 973 | #endif /* UIP_PINGADDRCONF */ |
hudakz | 0:5350a66d5279 | 974 | } |
hudakz | 0:5350a66d5279 | 975 | else |
hudakz | 0:5350a66d5279 | 976 | { |
hudakz | 0:5350a66d5279 | 977 | /* If IP broadcast support is configured, we check for a broadcast |
hudakz | 0:5350a66d5279 | 978 | UDP packet, which may be destined to us. */ |
hudakz | 0:5350a66d5279 | 979 | #if UIP_BROADCAST |
hudakz | 0:5350a66d5279 | 980 | DEBUG_PRINTF("UDP IP checksum 0x%04x\n", uip_ipchksum()); |
hudakz | 0:5350a66d5279 | 981 | if |
hudakz | 0:5350a66d5279 | 982 | ( |
hudakz | 0:5350a66d5279 | 983 | BUF->proto == UIP_PROTO_UDP |
hudakz | 0:5350a66d5279 | 984 | && uip_ipaddr_cmp(BUF->destipaddr, all_ones_addr) /*&& |
hudakz | 0:5350a66d5279 | 985 | uip_ipchksum() == 0xffff*/ |
hudakz | 0:5350a66d5279 | 986 | ) { |
hudakz | 0:5350a66d5279 | 987 | goto udp_input; |
hudakz | 0:5350a66d5279 | 988 | } |
hudakz | 0:5350a66d5279 | 989 | #endif /* UIP_BROADCAST */ |
hudakz | 0:5350a66d5279 | 990 | |
hudakz | 0:5350a66d5279 | 991 | /* Check if the packet is destined for our IP address. */ |
hudakz | 0:5350a66d5279 | 992 | |
hudakz | 0:5350a66d5279 | 993 | #if !UIP_CONF_IPV6 |
hudakz | 0:5350a66d5279 | 994 | if(!uip_ipaddr_cmp(BUF->destipaddr, uip_hostaddr)) { |
hudakz | 0:5350a66d5279 | 995 | UIP_STAT(++uip_stat.ip.drop); |
hudakz | 0:5350a66d5279 | 996 | goto drop; |
hudakz | 0:5350a66d5279 | 997 | } |
hudakz | 0:5350a66d5279 | 998 | |
hudakz | 0:5350a66d5279 | 999 | #else /* UIP_CONF_IPV6 */ |
hudakz | 0:5350a66d5279 | 1000 | /* For IPv6, packet reception is a little trickier as we need to |
hudakz | 0:5350a66d5279 | 1001 | make sure that we listen to certain multicast addresses (all |
hudakz | 0:5350a66d5279 | 1002 | hosts multicast address, and the solicited-node multicast |
hudakz | 0:5350a66d5279 | 1003 | address) as well. However, we will cheat here and accept all |
hudakz | 0:5350a66d5279 | 1004 | multicast packets that are sent to the ff02::/16 addresses. */ |
hudakz | 0:5350a66d5279 | 1005 | |
hudakz | 0:5350a66d5279 | 1006 | if(!uip_ipaddr_cmp(BUF->destipaddr, uip_hostaddr) && BUF->destipaddr[0] != HTONS(0xff02)) { |
hudakz | 0:5350a66d5279 | 1007 | UIP_STAT(++uip_stat.ip.drop); |
hudakz | 0:5350a66d5279 | 1008 | goto drop; |
hudakz | 0:5350a66d5279 | 1009 | } |
hudakz | 0:5350a66d5279 | 1010 | #endif /* UIP_CONF_IPV6 */ |
hudakz | 0:5350a66d5279 | 1011 | } |
hudakz | 0:5350a66d5279 | 1012 | |
hudakz | 0:5350a66d5279 | 1013 | #if !UIP_CONF_IPV6 |
hudakz | 0:5350a66d5279 | 1014 | if(uip_ipchksum() != 0xffff) { |
hudakz | 0:5350a66d5279 | 1015 | |
hudakz | 0:5350a66d5279 | 1016 | /* Compute and check the IP header |
hudakz | 0:5350a66d5279 | 1017 | checksum. */ |
hudakz | 0:5350a66d5279 | 1018 | UIP_STAT(++uip_stat.ip.drop); |
hudakz | 0:5350a66d5279 | 1019 | UIP_STAT(++uip_stat.ip.chkerr); |
hudakz | 0:5350a66d5279 | 1020 | UIP_LOG("ip: bad checksum."); |
hudakz | 0:5350a66d5279 | 1021 | goto drop; |
hudakz | 0:5350a66d5279 | 1022 | } |
hudakz | 0:5350a66d5279 | 1023 | #endif /* UIP_CONF_IPV6 */ |
hudakz | 0:5350a66d5279 | 1024 | |
hudakz | 0:5350a66d5279 | 1025 | if(BUF->proto == UIP_PROTO_TCP) { |
hudakz | 0:5350a66d5279 | 1026 | |
hudakz | 0:5350a66d5279 | 1027 | /* Check for TCP packet. If so, |
hudakz | 0:5350a66d5279 | 1028 | proceed with TCP input |
hudakz | 0:5350a66d5279 | 1029 | processing. */ |
hudakz | 0:5350a66d5279 | 1030 | goto tcp_input; |
hudakz | 0:5350a66d5279 | 1031 | } |
hudakz | 0:5350a66d5279 | 1032 | |
hudakz | 0:5350a66d5279 | 1033 | #if UIP_UDP |
hudakz | 0:5350a66d5279 | 1034 | if(BUF->proto == UIP_PROTO_UDP) { |
hudakz | 0:5350a66d5279 | 1035 | goto udp_input; |
hudakz | 0:5350a66d5279 | 1036 | } |
hudakz | 0:5350a66d5279 | 1037 | #endif /* UIP_UDP */ |
hudakz | 0:5350a66d5279 | 1038 | |
hudakz | 0:5350a66d5279 | 1039 | #if !UIP_CONF_IPV6 |
hudakz | 0:5350a66d5279 | 1040 | /* ICMPv4 processing code follows. */ |
hudakz | 0:5350a66d5279 | 1041 | |
hudakz | 0:5350a66d5279 | 1042 | if(BUF->proto != UIP_PROTO_ICMP) { |
hudakz | 0:5350a66d5279 | 1043 | |
hudakz | 0:5350a66d5279 | 1044 | /* We only allow ICMP packets from |
hudakz | 0:5350a66d5279 | 1045 | here. */ |
hudakz | 0:5350a66d5279 | 1046 | UIP_STAT(++uip_stat.ip.drop); |
hudakz | 0:5350a66d5279 | 1047 | UIP_STAT(++uip_stat.ip.protoerr); |
hudakz | 0:5350a66d5279 | 1048 | UIP_LOG("ip: neither tcp nor icmp."); |
hudakz | 0:5350a66d5279 | 1049 | goto drop; |
hudakz | 0:5350a66d5279 | 1050 | } |
hudakz | 0:5350a66d5279 | 1051 | |
hudakz | 0:5350a66d5279 | 1052 | #if UIP_PINGADDRCONF |
hudakz | 0:5350a66d5279 | 1053 | icmp_input : |
hudakz | 0:5350a66d5279 | 1054 | #endif /* UIP_PINGADDRCONF */ |
hudakz | 0:5350a66d5279 | 1055 | |
hudakz | 0:5350a66d5279 | 1056 | UIP_STAT(++uip_stat.icmp.recv); |
hudakz | 0:5350a66d5279 | 1057 | |
hudakz | 0:5350a66d5279 | 1058 | /* ICMP echo (i.e., ping) processing. This is simple, we only change |
hudakz | 0:5350a66d5279 | 1059 | the ICMP type from ECHO to ECHO_REPLY and adjust the ICMP |
hudakz | 0:5350a66d5279 | 1060 | checksum before we return the packet. */ |
hudakz | 0:5350a66d5279 | 1061 | if(ICMPBUF->type != ICMP_ECHO) { |
hudakz | 0:5350a66d5279 | 1062 | UIP_STAT(++uip_stat.icmp.drop); |
hudakz | 0:5350a66d5279 | 1063 | UIP_STAT(++uip_stat.icmp.typeerr); |
hudakz | 0:5350a66d5279 | 1064 | UIP_LOG("icmp: not icmp echo."); |
hudakz | 0:5350a66d5279 | 1065 | goto drop; |
hudakz | 0:5350a66d5279 | 1066 | } |
hudakz | 0:5350a66d5279 | 1067 | |
hudakz | 0:5350a66d5279 | 1068 | /* If we are configured to use ping IP address assignment, we use |
hudakz | 0:5350a66d5279 | 1069 | the destination IP address of this ping packet and assign it to |
hudakz | 0:5350a66d5279 | 1070 | ourself. */ |
hudakz | 0:5350a66d5279 | 1071 | #if UIP_PINGADDRCONF |
hudakz | 0:5350a66d5279 | 1072 | if((uip_hostaddr[0] | uip_hostaddr[1]) == 0) { |
hudakz | 0:5350a66d5279 | 1073 | uip_hostaddr[0] = BUF->destipaddr[0]; |
hudakz | 0:5350a66d5279 | 1074 | uip_hostaddr[1] = BUF->destipaddr[1]; |
hudakz | 0:5350a66d5279 | 1075 | } |
hudakz | 0:5350a66d5279 | 1076 | #endif /* UIP_PINGADDRCONF */ |
hudakz | 0:5350a66d5279 | 1077 | |
hudakz | 0:5350a66d5279 | 1078 | ICMPBUF->type = ICMP_ECHO_REPLY; |
hudakz | 0:5350a66d5279 | 1079 | |
hudakz | 0:5350a66d5279 | 1080 | if(ICMPBUF->icmpchksum >= HTONS(0xffff - (ICMP_ECHO << 8))) { |
hudakz | 0:5350a66d5279 | 1081 | ICMPBUF->icmpchksum += HTONS(ICMP_ECHO << 8) + 1; |
hudakz | 0:5350a66d5279 | 1082 | } |
hudakz | 0:5350a66d5279 | 1083 | else { |
hudakz | 0:5350a66d5279 | 1084 | ICMPBUF->icmpchksum += HTONS(ICMP_ECHO << 8); |
hudakz | 0:5350a66d5279 | 1085 | } |
hudakz | 0:5350a66d5279 | 1086 | |
hudakz | 0:5350a66d5279 | 1087 | /* Swap IP addresses. */ |
hudakz | 0:5350a66d5279 | 1088 | uip_ipaddr_copy(BUF->destipaddr, BUF->srcipaddr); |
hudakz | 0:5350a66d5279 | 1089 | uip_ipaddr_copy(BUF->srcipaddr, uip_hostaddr); |
hudakz | 0:5350a66d5279 | 1090 | |
hudakz | 0:5350a66d5279 | 1091 | UIP_STAT(++uip_stat.icmp.sent); |
hudakz | 0:5350a66d5279 | 1092 | goto send; |
hudakz | 0:5350a66d5279 | 1093 | |
hudakz | 0:5350a66d5279 | 1094 | /* End of IPv4 input header processing code. */ |
hudakz | 0:5350a66d5279 | 1095 | #else /* !UIP_CONF_IPV6 */ |
hudakz | 0:5350a66d5279 | 1096 | /* This is IPv6 ICMPv6 processing code. */ |
hudakz | 0:5350a66d5279 | 1097 | |
hudakz | 0:5350a66d5279 | 1098 | DEBUG_PRINTF("icmp6_input: length %d\n", uip_len); |
hudakz | 0:5350a66d5279 | 1099 | |
hudakz | 0:5350a66d5279 | 1100 | if(BUF->proto != UIP_PROTO_ICMP6) { |
hudakz | 0:5350a66d5279 | 1101 | |
hudakz | 0:5350a66d5279 | 1102 | /* We only allow ICMPv6 packets from |
hudakz | 0:5350a66d5279 | 1103 | here. */ |
hudakz | 0:5350a66d5279 | 1104 | UIP_STAT(++uip_stat.ip.drop); |
hudakz | 0:5350a66d5279 | 1105 | UIP_STAT(++uip_stat.ip.protoerr); |
hudakz | 0:5350a66d5279 | 1106 | UIP_LOG("ip: neither tcp nor icmp6."); |
hudakz | 0:5350a66d5279 | 1107 | goto drop; |
hudakz | 0:5350a66d5279 | 1108 | } |
hudakz | 0:5350a66d5279 | 1109 | |
hudakz | 0:5350a66d5279 | 1110 | UIP_STAT(++uip_stat.icmp.recv); |
hudakz | 0:5350a66d5279 | 1111 | |
hudakz | 0:5350a66d5279 | 1112 | /* If we get a neighbor solicitation for our address we should send |
hudakz | 0:5350a66d5279 | 1113 | a neighbor advertisement message back. */ |
hudakz | 0:5350a66d5279 | 1114 | if(ICMPBUF->type == ICMP6_NEIGHBOR_SOLICITATION) { |
hudakz | 0:5350a66d5279 | 1115 | if(uip_ipaddr_cmp(ICMPBUF->icmp6data, uip_hostaddr)) { |
hudakz | 0:5350a66d5279 | 1116 | if(ICMPBUF->options[0] == ICMP6_OPTION_SOURCE_LINK_ADDRESS) { |
hudakz | 0:5350a66d5279 | 1117 | |
hudakz | 0:5350a66d5279 | 1118 | /* Save the sender's address in our neighbor list. */ |
hudakz | 0:5350a66d5279 | 1119 | uip_neighbor_add(ICMPBUF->srcipaddr, &(ICMPBUF->options[2])); |
hudakz | 0:5350a66d5279 | 1120 | } |
hudakz | 0:5350a66d5279 | 1121 | |
hudakz | 0:5350a66d5279 | 1122 | /* We should now send a neighbor advertisement back to where the |
hudakz | 0:5350a66d5279 | 1123 | neighbor solicication came from. */ |
hudakz | 0:5350a66d5279 | 1124 | ICMPBUF->type = ICMP6_NEIGHBOR_ADVERTISEMENT; |
hudakz | 0:5350a66d5279 | 1125 | ICMPBUF->flags = ICMP6_FLAG_S; /* Solicited flag. */ |
hudakz | 0:5350a66d5279 | 1126 | |
hudakz | 0:5350a66d5279 | 1127 | ICMPBUF->reserved1 = ICMPBUF->reserved2 = ICMPBUF->reserved3 = 0; |
hudakz | 0:5350a66d5279 | 1128 | |
hudakz | 0:5350a66d5279 | 1129 | uip_ipaddr_copy(ICMPBUF->destipaddr, ICMPBUF->srcipaddr); |
hudakz | 0:5350a66d5279 | 1130 | uip_ipaddr_copy(ICMPBUF->srcipaddr, uip_hostaddr); |
hudakz | 0:5350a66d5279 | 1131 | ICMPBUF->options[0] = ICMP6_OPTION_TARGET_LINK_ADDRESS; |
hudakz | 0:5350a66d5279 | 1132 | ICMPBUF->options[1] = 1; /* Options length, 1 = 8 bytes. */ |
hudakz | 0:5350a66d5279 | 1133 | memcpy(&(ICMPBUF->options[2]), &uip_ethaddr, sizeof(uip_ethaddr)); |
hudakz | 0:5350a66d5279 | 1134 | ICMPBUF->icmpchksum = 0; |
hudakz | 0:5350a66d5279 | 1135 | ICMPBUF->icmpchksum = ~uip_icmp6chksum(); |
hudakz | 0:5350a66d5279 | 1136 | goto send; |
hudakz | 0:5350a66d5279 | 1137 | } |
hudakz | 0:5350a66d5279 | 1138 | |
hudakz | 0:5350a66d5279 | 1139 | goto drop; |
hudakz | 0:5350a66d5279 | 1140 | } |
hudakz | 0:5350a66d5279 | 1141 | else |
hudakz | 0:5350a66d5279 | 1142 | if(ICMPBUF->type == ICMP6_ECHO) { |
hudakz | 0:5350a66d5279 | 1143 | |
hudakz | 0:5350a66d5279 | 1144 | /* ICMP echo (i.e., ping) processing. This is simple, we only |
hudakz | 0:5350a66d5279 | 1145 | change the ICMP type from ECHO to ECHO_REPLY and update the |
hudakz | 0:5350a66d5279 | 1146 | ICMP checksum before we return the packet. */ |
hudakz | 0:5350a66d5279 | 1147 | ICMPBUF->type = ICMP6_ECHO_REPLY; |
hudakz | 0:5350a66d5279 | 1148 | |
hudakz | 0:5350a66d5279 | 1149 | uip_ipaddr_copy(BUF->destipaddr, BUF->srcipaddr); |
hudakz | 0:5350a66d5279 | 1150 | uip_ipaddr_copy(BUF->srcipaddr, uip_hostaddr); |
hudakz | 0:5350a66d5279 | 1151 | ICMPBUF->icmpchksum = 0; |
hudakz | 0:5350a66d5279 | 1152 | ICMPBUF->icmpchksum = ~uip_icmp6chksum(); |
hudakz | 0:5350a66d5279 | 1153 | |
hudakz | 0:5350a66d5279 | 1154 | UIP_STAT(++uip_stat.icmp.sent); |
hudakz | 0:5350a66d5279 | 1155 | goto send; |
hudakz | 0:5350a66d5279 | 1156 | } |
hudakz | 0:5350a66d5279 | 1157 | else { |
hudakz | 0:5350a66d5279 | 1158 | DEBUG_PRINTF("Unknown icmp6 message type %d\n", ICMPBUF->type); |
hudakz | 0:5350a66d5279 | 1159 | UIP_STAT(++uip_stat.icmp.drop); |
hudakz | 0:5350a66d5279 | 1160 | UIP_STAT(++uip_stat.icmp.typeerr); |
hudakz | 0:5350a66d5279 | 1161 | UIP_LOG("icmp: unknown ICMP message."); |
hudakz | 0:5350a66d5279 | 1162 | goto drop; |
hudakz | 0:5350a66d5279 | 1163 | } |
hudakz | 0:5350a66d5279 | 1164 | |
hudakz | 0:5350a66d5279 | 1165 | /* End of IPv6 ICMP processing. */ |
hudakz | 0:5350a66d5279 | 1166 | #endif /* !UIP_CONF_IPV6 */ |
hudakz | 0:5350a66d5279 | 1167 | |
hudakz | 0:5350a66d5279 | 1168 | #if UIP_UDP |
hudakz | 0:5350a66d5279 | 1169 | /* UDP input processing. */ |
hudakz | 0:5350a66d5279 | 1170 | |
hudakz | 0:5350a66d5279 | 1171 | udp_input : |
hudakz | 0:5350a66d5279 | 1172 | /* UDP processing is really just a hack. We don't do anything to the |
hudakz | 0:5350a66d5279 | 1173 | UDP/IP headers, but let the UDP application do all the hard |
hudakz | 0:5350a66d5279 | 1174 | work. If the application sets uip_slen, it has a packet to |
hudakz | 0:5350a66d5279 | 1175 | send. */ |
hudakz | 0:5350a66d5279 | 1176 | #if UIP_UDP_CHECKSUMS |
hudakz | 0:5350a66d5279 | 1177 | uip_len = uip_len - UIP_IPUDPH_LEN; |
hudakz | 0:5350a66d5279 | 1178 | uip_appdata = &uip_buf[UIP_LLH_LEN + UIP_IPUDPH_LEN]; |
hudakz | 0:5350a66d5279 | 1179 | if(UDPBUF->udpchksum != 0 && uip_udpchksum() != 0xffff) { |
hudakz | 0:5350a66d5279 | 1180 | UIP_STAT(++uip_stat.udp.drop); |
hudakz | 0:5350a66d5279 | 1181 | UIP_STAT(++uip_stat.udp.chkerr); |
hudakz | 0:5350a66d5279 | 1182 | UIP_LOG("udp: bad checksum."); |
hudakz | 0:5350a66d5279 | 1183 | goto drop; |
hudakz | 0:5350a66d5279 | 1184 | } |
hudakz | 0:5350a66d5279 | 1185 | |
hudakz | 0:5350a66d5279 | 1186 | #else /* UIP_UDP_CHECKSUMS */ |
hudakz | 0:5350a66d5279 | 1187 | uip_len = uip_len - UIP_IPUDPH_LEN; |
hudakz | 0:5350a66d5279 | 1188 | #endif /* UIP_UDP_CHECKSUMS */ |
hudakz | 0:5350a66d5279 | 1189 | |
hudakz | 0:5350a66d5279 | 1190 | /* Demultiplex this UDP packet between the UDP "connections". */ |
hudakz | 0:5350a66d5279 | 1191 | |
hudakz | 0:5350a66d5279 | 1192 | for(uip_udp_conn = &uip_udp_conns[0]; uip_udp_conn < &uip_udp_conns[UIP_UDP_CONNS]; ++uip_udp_conn) { |
hudakz | 0:5350a66d5279 | 1193 | |
hudakz | 0:5350a66d5279 | 1194 | /* If the local UDP port is non-zero, the connection is considered |
hudakz | 0:5350a66d5279 | 1195 | to be used. If so, the local port number is checked against the |
hudakz | 0:5350a66d5279 | 1196 | destination port number in the received packet. If the two port |
hudakz | 0:5350a66d5279 | 1197 | numbers match, the remote port number is checked if the |
hudakz | 0:5350a66d5279 | 1198 | connection is bound to a remote port. Finally, if the |
hudakz | 0:5350a66d5279 | 1199 | connection is bound to a remote IP address, the source IP |
hudakz | 0:5350a66d5279 | 1200 | address of the packet is checked. */ |
hudakz | 0:5350a66d5279 | 1201 | if |
hudakz | 0:5350a66d5279 | 1202 | ( |
hudakz | 0:5350a66d5279 | 1203 | uip_udp_conn->lport != 0 |
hudakz | 0:5350a66d5279 | 1204 | && UDPBUF->destport == uip_udp_conn->lport |
hudakz | 0:5350a66d5279 | 1205 | && (uip_udp_conn->rport == 0 || UDPBUF->srcport == uip_udp_conn->rport) |
hudakz | 0:5350a66d5279 | 1206 | && ( |
hudakz | 0:5350a66d5279 | 1207 | uip_ipaddr_cmp(uip_udp_conn->ripaddr, all_zeroes_addr) |
hudakz | 0:5350a66d5279 | 1208 | || uip_ipaddr_cmp(uip_udp_conn->ripaddr, all_ones_addr) |
hudakz | 0:5350a66d5279 | 1209 | || uip_ipaddr_cmp(BUF->srcipaddr, uip_udp_conn->ripaddr) |
hudakz | 0:5350a66d5279 | 1210 | ) |
hudakz | 0:5350a66d5279 | 1211 | ) { |
hudakz | 0:5350a66d5279 | 1212 | goto udp_found; |
hudakz | 0:5350a66d5279 | 1213 | } |
hudakz | 0:5350a66d5279 | 1214 | } |
hudakz | 0:5350a66d5279 | 1215 | |
hudakz | 0:5350a66d5279 | 1216 | UIP_LOG("udp: no matching connection found"); |
hudakz | 0:5350a66d5279 | 1217 | goto drop; |
hudakz | 0:5350a66d5279 | 1218 | |
hudakz | 0:5350a66d5279 | 1219 | udp_found: |
hudakz | 0:5350a66d5279 | 1220 | uip_conn = NULL; |
hudakz | 0:5350a66d5279 | 1221 | uip_flags = UIP_NEWDATA; |
hudakz | 0:5350a66d5279 | 1222 | uip_sappdata = uip_appdata = &uip_buf[UIP_LLH_LEN + UIP_IPUDPH_LEN]; |
hudakz | 0:5350a66d5279 | 1223 | uip_slen = 0; |
hudakz | 0:5350a66d5279 | 1224 | UIP_UDP_APPCALL(); |
hudakz | 0:5350a66d5279 | 1225 | udp_send: |
hudakz | 0:5350a66d5279 | 1226 | if(uip_slen == 0) { |
hudakz | 0:5350a66d5279 | 1227 | goto drop; |
hudakz | 0:5350a66d5279 | 1228 | } |
hudakz | 0:5350a66d5279 | 1229 | |
hudakz | 0:5350a66d5279 | 1230 | uip_len = uip_slen + UIP_IPUDPH_LEN; |
hudakz | 0:5350a66d5279 | 1231 | |
hudakz | 0:5350a66d5279 | 1232 | #if UIP_CONF_IPV6 |
hudakz | 0:5350a66d5279 | 1233 | /* For IPv6, the IP length field does not include the IPv6 IP header |
hudakz | 0:5350a66d5279 | 1234 | length. */ |
hudakz | 0:5350a66d5279 | 1235 | |
hudakz | 0:5350a66d5279 | 1236 | BUF->len[0] = ((uip_len - UIP_IPH_LEN) >> 8); |
hudakz | 0:5350a66d5279 | 1237 | BUF->len[1] = ((uip_len - UIP_IPH_LEN) & 0xff); |
hudakz | 0:5350a66d5279 | 1238 | #else /* UIP_CONF_IPV6 */ |
hudakz | 0:5350a66d5279 | 1239 | BUF->len[0] = (uip_len >> 8); |
hudakz | 0:5350a66d5279 | 1240 | BUF->len[1] = (uip_len & 0xff); |
hudakz | 0:5350a66d5279 | 1241 | #endif /* UIP_CONF_IPV6 */ |
hudakz | 0:5350a66d5279 | 1242 | |
hudakz | 0:5350a66d5279 | 1243 | BUF->ttl = uip_udp_conn->ttl; |
hudakz | 0:5350a66d5279 | 1244 | BUF->proto = UIP_PROTO_UDP; |
hudakz | 0:5350a66d5279 | 1245 | |
hudakz | 0:5350a66d5279 | 1246 | UDPBUF->udplen = HTONS(uip_slen + UIP_UDPH_LEN); |
hudakz | 0:5350a66d5279 | 1247 | UDPBUF->udpchksum = 0; |
hudakz | 0:5350a66d5279 | 1248 | |
hudakz | 0:5350a66d5279 | 1249 | BUF->srcport = uip_udp_conn->lport; |
hudakz | 0:5350a66d5279 | 1250 | BUF->destport = uip_udp_conn->rport; |
hudakz | 0:5350a66d5279 | 1251 | |
hudakz | 0:5350a66d5279 | 1252 | uip_ipaddr_copy(BUF->srcipaddr, uip_hostaddr); |
hudakz | 0:5350a66d5279 | 1253 | uip_ipaddr_copy(BUF->destipaddr, uip_udp_conn->ripaddr); |
hudakz | 0:5350a66d5279 | 1254 | |
hudakz | 0:5350a66d5279 | 1255 | uip_appdata = &uip_buf[UIP_LLH_LEN + UIP_IPTCPH_LEN]; |
hudakz | 0:5350a66d5279 | 1256 | |
hudakz | 0:5350a66d5279 | 1257 | #if UIP_UDP_CHECKSUMS |
hudakz | 0:5350a66d5279 | 1258 | /* Calculate UDP checksum. */ |
hudakz | 0:5350a66d5279 | 1259 | |
hudakz | 0:5350a66d5279 | 1260 | UDPBUF->udpchksum = ~(uip_udpchksum()); |
hudakz | 0:5350a66d5279 | 1261 | if(UDPBUF->udpchksum == 0) { |
hudakz | 0:5350a66d5279 | 1262 | UDPBUF->udpchksum = 0xffff; |
hudakz | 0:5350a66d5279 | 1263 | } |
hudakz | 0:5350a66d5279 | 1264 | #endif /* UIP_UDP_CHECKSUMS */ |
hudakz | 0:5350a66d5279 | 1265 | |
hudakz | 0:5350a66d5279 | 1266 | goto ip_send_nolen; |
hudakz | 0:5350a66d5279 | 1267 | #endif /* UIP_UDP */ |
hudakz | 0:5350a66d5279 | 1268 | |
hudakz | 0:5350a66d5279 | 1269 | /* TCP input processing. */ |
hudakz | 0:5350a66d5279 | 1270 | |
hudakz | 0:5350a66d5279 | 1271 | tcp_input : UIP_STAT(++uip_stat.tcp.recv); |
hudakz | 0:5350a66d5279 | 1272 | |
hudakz | 0:5350a66d5279 | 1273 | /* Start of TCP input header processing code. */ |
hudakz | 0:5350a66d5279 | 1274 | if(uip_tcpchksum() != 0xffff) { |
hudakz | 0:5350a66d5279 | 1275 | |
hudakz | 0:5350a66d5279 | 1276 | /* Compute and check the TCP |
hudakz | 0:5350a66d5279 | 1277 | checksum. */ |
hudakz | 0:5350a66d5279 | 1278 | UIP_STAT(++uip_stat.tcp.drop); |
hudakz | 0:5350a66d5279 | 1279 | UIP_STAT(++uip_stat.tcp.chkerr); |
hudakz | 0:5350a66d5279 | 1280 | UIP_LOG("tcp: bad checksum."); |
hudakz | 0:5350a66d5279 | 1281 | goto drop; |
hudakz | 0:5350a66d5279 | 1282 | } |
hudakz | 0:5350a66d5279 | 1283 | |
hudakz | 0:5350a66d5279 | 1284 | /* Demultiplex this segment. */ |
hudakz | 0:5350a66d5279 | 1285 | /* First check any active connections. */ |
hudakz | 0:5350a66d5279 | 1286 | for(uip_connr = &uip_conns[0]; uip_connr <= &uip_conns[UIP_CONNS - 1]; ++uip_connr) { |
hudakz | 0:5350a66d5279 | 1287 | if |
hudakz | 0:5350a66d5279 | 1288 | ( |
hudakz | 0:5350a66d5279 | 1289 | uip_connr->tcpstateflags != UIP_CLOSED |
hudakz | 0:5350a66d5279 | 1290 | && BUF->destport == uip_connr->lport |
hudakz | 0:5350a66d5279 | 1291 | && BUF->srcport == uip_connr->rport |
hudakz | 0:5350a66d5279 | 1292 | && uip_ipaddr_cmp(BUF->srcipaddr, uip_connr->ripaddr) |
hudakz | 0:5350a66d5279 | 1293 | ) { |
hudakz | 0:5350a66d5279 | 1294 | goto found; |
hudakz | 0:5350a66d5279 | 1295 | } |
hudakz | 0:5350a66d5279 | 1296 | } |
hudakz | 0:5350a66d5279 | 1297 | |
hudakz | 0:5350a66d5279 | 1298 | /* If we didn't find and active connection that expected the packet, |
hudakz | 0:5350a66d5279 | 1299 | either this packet is an old duplicate, or this is a SYN packet |
hudakz | 0:5350a66d5279 | 1300 | destined for a connection in LISTEN. If the SYN flag isn't set, |
hudakz | 0:5350a66d5279 | 1301 | it is an old packet and we send a RST. */ |
hudakz | 0:5350a66d5279 | 1302 | if((BUF->flags & TCP_CTL) != TCP_SYN) { |
hudakz | 0:5350a66d5279 | 1303 | goto reset; |
hudakz | 0:5350a66d5279 | 1304 | } |
hudakz | 0:5350a66d5279 | 1305 | |
hudakz | 0:5350a66d5279 | 1306 | tmp16 = BUF->destport; |
hudakz | 0:5350a66d5279 | 1307 | |
hudakz | 0:5350a66d5279 | 1308 | /* Next, check listening connections. */ |
hudakz | 0:5350a66d5279 | 1309 | for(c = 0; c < UIP_LISTENPORTS; ++c) { |
hudakz | 0:5350a66d5279 | 1310 | if(tmp16 == uip_listenports[c]) |
hudakz | 0:5350a66d5279 | 1311 | goto found_listen; |
hudakz | 0:5350a66d5279 | 1312 | } |
hudakz | 0:5350a66d5279 | 1313 | |
hudakz | 0:5350a66d5279 | 1314 | /* No matching connection found, so we send a RST packet. */ |
hudakz | 0:5350a66d5279 | 1315 | UIP_STAT(++uip_stat.tcp.synrst); |
hudakz | 0:5350a66d5279 | 1316 | reset: |
hudakz | 0:5350a66d5279 | 1317 | /* We do not send resets in response to resets. */ |
hudakz | 0:5350a66d5279 | 1318 | if(BUF->flags & TCP_RST) { |
hudakz | 0:5350a66d5279 | 1319 | goto drop; |
hudakz | 0:5350a66d5279 | 1320 | } |
hudakz | 0:5350a66d5279 | 1321 | |
hudakz | 0:5350a66d5279 | 1322 | UIP_STAT(++uip_stat.tcp.rst); |
hudakz | 0:5350a66d5279 | 1323 | |
hudakz | 0:5350a66d5279 | 1324 | BUF->flags = TCP_RST | TCP_ACK; |
hudakz | 0:5350a66d5279 | 1325 | uip_len = UIP_IPTCPH_LEN; |
hudakz | 0:5350a66d5279 | 1326 | BUF->tcpoffset = 5 << 4; |
hudakz | 0:5350a66d5279 | 1327 | |
hudakz | 0:5350a66d5279 | 1328 | /* Flip the seqno and ackno fields in the TCP header. */ |
hudakz | 0:5350a66d5279 | 1329 | c = BUF->seqno[3]; |
hudakz | 0:5350a66d5279 | 1330 | BUF->seqno[3] = BUF->ackno[3]; |
hudakz | 0:5350a66d5279 | 1331 | BUF->ackno[3] = c; |
hudakz | 0:5350a66d5279 | 1332 | |
hudakz | 0:5350a66d5279 | 1333 | c = BUF->seqno[2]; |
hudakz | 0:5350a66d5279 | 1334 | BUF->seqno[2] = BUF->ackno[2]; |
hudakz | 0:5350a66d5279 | 1335 | BUF->ackno[2] = c; |
hudakz | 0:5350a66d5279 | 1336 | |
hudakz | 0:5350a66d5279 | 1337 | c = BUF->seqno[1]; |
hudakz | 0:5350a66d5279 | 1338 | BUF->seqno[1] = BUF->ackno[1]; |
hudakz | 0:5350a66d5279 | 1339 | BUF->ackno[1] = c; |
hudakz | 0:5350a66d5279 | 1340 | |
hudakz | 0:5350a66d5279 | 1341 | c = BUF->seqno[0]; |
hudakz | 0:5350a66d5279 | 1342 | BUF->seqno[0] = BUF->ackno[0]; |
hudakz | 0:5350a66d5279 | 1343 | BUF->ackno[0] = c; |
hudakz | 0:5350a66d5279 | 1344 | |
hudakz | 0:5350a66d5279 | 1345 | /* We also have to increase the sequence number we are |
hudakz | 0:5350a66d5279 | 1346 | acknowledging. If the least significant byte overflowed, we need |
hudakz | 0:5350a66d5279 | 1347 | to propagate the carry to the other bytes as well. */ |
hudakz | 0:5350a66d5279 | 1348 | if(++BUF->ackno[3] == 0) { |
hudakz | 0:5350a66d5279 | 1349 | if(++BUF->ackno[2] == 0) { |
hudakz | 0:5350a66d5279 | 1350 | if(++BUF->ackno[1] == 0) { |
hudakz | 0:5350a66d5279 | 1351 | ++BUF->ackno[0]; |
hudakz | 0:5350a66d5279 | 1352 | } |
hudakz | 0:5350a66d5279 | 1353 | } |
hudakz | 0:5350a66d5279 | 1354 | } |
hudakz | 0:5350a66d5279 | 1355 | |
hudakz | 0:5350a66d5279 | 1356 | /* Swap port numbers. */ |
hudakz | 0:5350a66d5279 | 1357 | tmp16 = BUF->srcport; |
hudakz | 0:5350a66d5279 | 1358 | BUF->srcport = BUF->destport; |
hudakz | 0:5350a66d5279 | 1359 | BUF->destport = tmp16; |
hudakz | 0:5350a66d5279 | 1360 | |
hudakz | 0:5350a66d5279 | 1361 | /* Swap IP addresses. */ |
hudakz | 0:5350a66d5279 | 1362 | uip_ipaddr_copy(BUF->destipaddr, BUF->srcipaddr); |
hudakz | 0:5350a66d5279 | 1363 | uip_ipaddr_copy(BUF->srcipaddr, uip_hostaddr); |
hudakz | 0:5350a66d5279 | 1364 | |
hudakz | 0:5350a66d5279 | 1365 | /* And send out the RST packet! */ |
hudakz | 0:5350a66d5279 | 1366 | goto tcp_send_noconn; |
hudakz | 0:5350a66d5279 | 1367 | |
hudakz | 0:5350a66d5279 | 1368 | /* This label will be jumped to if we matched the incoming packet |
hudakz | 0:5350a66d5279 | 1369 | with a connection in LISTEN. In that case, we should create a new |
hudakz | 0:5350a66d5279 | 1370 | connection and send a SYNACK in return. */ |
hudakz | 0:5350a66d5279 | 1371 | found_listen: |
hudakz | 0:5350a66d5279 | 1372 | /* First we check if there are any connections avaliable. Unused |
hudakz | 0:5350a66d5279 | 1373 | connections are kept in the same table as used connections, but |
hudakz | 0:5350a66d5279 | 1374 | unused ones have the tcpstate set to CLOSED. Also, connections in |
hudakz | 0:5350a66d5279 | 1375 | TIME_WAIT are kept track of and we'll use the oldest one if no |
hudakz | 0:5350a66d5279 | 1376 | CLOSED connections are found. Thanks to Eddie C. Dost for a very |
hudakz | 0:5350a66d5279 | 1377 | nice algorithm for the TIME_WAIT search. */ |
hudakz | 0:5350a66d5279 | 1378 | uip_connr = 0; |
hudakz | 0:5350a66d5279 | 1379 | for(c = 0; c < UIP_CONNS; ++c) { |
hudakz | 0:5350a66d5279 | 1380 | if(uip_conns[c].tcpstateflags == UIP_CLOSED) { |
hudakz | 0:5350a66d5279 | 1381 | uip_connr = &uip_conns[c]; |
hudakz | 0:5350a66d5279 | 1382 | break; |
hudakz | 0:5350a66d5279 | 1383 | } |
hudakz | 0:5350a66d5279 | 1384 | |
hudakz | 0:5350a66d5279 | 1385 | if(uip_conns[c].tcpstateflags == UIP_TIME_WAIT) { |
hudakz | 0:5350a66d5279 | 1386 | if(uip_connr == 0 || uip_conns[c].timer > uip_connr->timer) { |
hudakz | 0:5350a66d5279 | 1387 | uip_connr = &uip_conns[c]; |
hudakz | 0:5350a66d5279 | 1388 | } |
hudakz | 0:5350a66d5279 | 1389 | } |
hudakz | 0:5350a66d5279 | 1390 | } |
hudakz | 0:5350a66d5279 | 1391 | |
hudakz | 0:5350a66d5279 | 1392 | if(uip_connr == 0) { |
hudakz | 0:5350a66d5279 | 1393 | |
hudakz | 0:5350a66d5279 | 1394 | /* All connections are used already, we drop packet and hope that |
hudakz | 0:5350a66d5279 | 1395 | the remote end will retransmit the packet at a time when we |
hudakz | 0:5350a66d5279 | 1396 | have more spare connections. */ |
hudakz | 0:5350a66d5279 | 1397 | UIP_STAT(++uip_stat.tcp.syndrop); |
hudakz | 0:5350a66d5279 | 1398 | UIP_LOG("tcp: found no unused connections."); |
hudakz | 0:5350a66d5279 | 1399 | goto drop; |
hudakz | 0:5350a66d5279 | 1400 | } |
hudakz | 0:5350a66d5279 | 1401 | |
hudakz | 0:5350a66d5279 | 1402 | uip_conn = uip_connr; |
hudakz | 0:5350a66d5279 | 1403 | |
hudakz | 0:5350a66d5279 | 1404 | /* Fill in the necessary fields for the new connection. */ |
hudakz | 0:5350a66d5279 | 1405 | uip_connr->rto = uip_connr->timer = UIP_RTO; |
hudakz | 0:5350a66d5279 | 1406 | uip_connr->sa = 0; |
hudakz | 0:5350a66d5279 | 1407 | uip_connr->sv = 4; |
hudakz | 0:5350a66d5279 | 1408 | uip_connr->nrtx = 0; |
hudakz | 0:5350a66d5279 | 1409 | uip_connr->lport = BUF->destport; |
hudakz | 0:5350a66d5279 | 1410 | uip_connr->rport = BUF->srcport; |
hudakz | 0:5350a66d5279 | 1411 | uip_ipaddr_copy(uip_connr->ripaddr, BUF->srcipaddr); |
hudakz | 0:5350a66d5279 | 1412 | uip_connr->tcpstateflags = UIP_SYN_RCVD; |
hudakz | 0:5350a66d5279 | 1413 | |
hudakz | 0:5350a66d5279 | 1414 | uip_connr->snd_nxt[0] = iss[0]; |
hudakz | 0:5350a66d5279 | 1415 | uip_connr->snd_nxt[1] = iss[1]; |
hudakz | 0:5350a66d5279 | 1416 | uip_connr->snd_nxt[2] = iss[2]; |
hudakz | 0:5350a66d5279 | 1417 | uip_connr->snd_nxt[3] = iss[3]; |
hudakz | 0:5350a66d5279 | 1418 | uip_connr->len = 1; |
hudakz | 0:5350a66d5279 | 1419 | |
hudakz | 0:5350a66d5279 | 1420 | /* rcv_nxt should be the seqno from the incoming packet + 1. */ |
hudakz | 0:5350a66d5279 | 1421 | uip_connr->rcv_nxt[3] = BUF->seqno[3]; |
hudakz | 0:5350a66d5279 | 1422 | uip_connr->rcv_nxt[2] = BUF->seqno[2]; |
hudakz | 0:5350a66d5279 | 1423 | uip_connr->rcv_nxt[1] = BUF->seqno[1]; |
hudakz | 0:5350a66d5279 | 1424 | uip_connr->rcv_nxt[0] = BUF->seqno[0]; |
hudakz | 0:5350a66d5279 | 1425 | uip_add_rcv_nxt(1); |
hudakz | 0:5350a66d5279 | 1426 | |
hudakz | 0:5350a66d5279 | 1427 | /* Parse the TCP MSS option, if present. */ |
hudakz | 0:5350a66d5279 | 1428 | if((BUF->tcpoffset & 0xf0) > 0x50) { |
hudakz | 0:5350a66d5279 | 1429 | for(c = 0; c < ((BUF->tcpoffset >> 4) - 5) << 2;) { |
hudakz | 0:5350a66d5279 | 1430 | opt = uip_buf[UIP_TCPIP_HLEN + UIP_LLH_LEN + c]; |
hudakz | 0:5350a66d5279 | 1431 | if(opt == TCP_OPT_END) { |
hudakz | 0:5350a66d5279 | 1432 | |
hudakz | 0:5350a66d5279 | 1433 | /* End of options. */ |
hudakz | 0:5350a66d5279 | 1434 | break; |
hudakz | 0:5350a66d5279 | 1435 | } |
hudakz | 0:5350a66d5279 | 1436 | else |
hudakz | 0:5350a66d5279 | 1437 | if(opt == TCP_OPT_NOOP) { |
hudakz | 0:5350a66d5279 | 1438 | ++c; |
hudakz | 0:5350a66d5279 | 1439 | |
hudakz | 0:5350a66d5279 | 1440 | /* NOP option. */ |
hudakz | 0:5350a66d5279 | 1441 | } |
hudakz | 0:5350a66d5279 | 1442 | else |
hudakz | 0:5350a66d5279 | 1443 | if(opt == TCP_OPT_MSS && uip_buf[UIP_TCPIP_HLEN + UIP_LLH_LEN + 1 + c] == TCP_OPT_MSS_LEN) { |
hudakz | 0:5350a66d5279 | 1444 | |
hudakz | 0:5350a66d5279 | 1445 | /* An MSS option with the right option length. */ |
hudakz | 0:5350a66d5279 | 1446 | tmp16 = ((u16_t) uip_buf[UIP_TCPIP_HLEN + UIP_LLH_LEN + 2 + c] << 8) | (u16_t) uip_buf[UIP_IPTCPH_LEN + UIP_LLH_LEN + 3 + c]; |
hudakz | 0:5350a66d5279 | 1447 | uip_connr->initialmss = uip_connr->mss = tmp16 > UIP_TCP_MSS ? UIP_TCP_MSS : tmp16; |
hudakz | 0:5350a66d5279 | 1448 | |
hudakz | 0:5350a66d5279 | 1449 | /* And we are done processing options. */ |
hudakz | 0:5350a66d5279 | 1450 | break; |
hudakz | 0:5350a66d5279 | 1451 | } |
hudakz | 0:5350a66d5279 | 1452 | else { |
hudakz | 0:5350a66d5279 | 1453 | |
hudakz | 0:5350a66d5279 | 1454 | /* All other options have a length field, so that we easily |
hudakz | 0:5350a66d5279 | 1455 | can skip past them. */ |
hudakz | 0:5350a66d5279 | 1456 | if(uip_buf[UIP_TCPIP_HLEN + UIP_LLH_LEN + 1 + c] == 0) { |
hudakz | 0:5350a66d5279 | 1457 | |
hudakz | 0:5350a66d5279 | 1458 | /* If the length field is zero, the options are malformed |
hudakz | 0:5350a66d5279 | 1459 | and we don't process them further. */ |
hudakz | 0:5350a66d5279 | 1460 | break; |
hudakz | 0:5350a66d5279 | 1461 | } |
hudakz | 0:5350a66d5279 | 1462 | |
hudakz | 0:5350a66d5279 | 1463 | c += uip_buf[UIP_TCPIP_HLEN + UIP_LLH_LEN + 1 + c]; |
hudakz | 0:5350a66d5279 | 1464 | } |
hudakz | 0:5350a66d5279 | 1465 | } |
hudakz | 0:5350a66d5279 | 1466 | } |
hudakz | 0:5350a66d5279 | 1467 | |
hudakz | 0:5350a66d5279 | 1468 | /* Our response will be a SYNACK. */ |
hudakz | 0:5350a66d5279 | 1469 | #if UIP_ACTIVE_OPEN |
hudakz | 0:5350a66d5279 | 1470 | tcp_send_synack : BUF->flags = TCP_ACK; |
hudakz | 0:5350a66d5279 | 1471 | |
hudakz | 0:5350a66d5279 | 1472 | tcp_send_syn: |
hudakz | 0:5350a66d5279 | 1473 | BUF->flags |= TCP_SYN; |
hudakz | 0:5350a66d5279 | 1474 | #else /* UIP_ACTIVE_OPEN */ |
hudakz | 0:5350a66d5279 | 1475 | tcp_send_synack : BUF->flags = TCP_SYN | TCP_ACK; |
hudakz | 0:5350a66d5279 | 1476 | #endif /* UIP_ACTIVE_OPEN */ |
hudakz | 0:5350a66d5279 | 1477 | |
hudakz | 0:5350a66d5279 | 1478 | /* We send out the TCP Maximum Segment Size option with our |
hudakz | 0:5350a66d5279 | 1479 | SYNACK. */ |
hudakz | 0:5350a66d5279 | 1480 | |
hudakz | 0:5350a66d5279 | 1481 | BUF->optdata[0] = TCP_OPT_MSS; |
hudakz | 0:5350a66d5279 | 1482 | BUF->optdata[1] = TCP_OPT_MSS_LEN; |
hudakz | 0:5350a66d5279 | 1483 | BUF->optdata[2] = (UIP_TCP_MSS) / 256; |
hudakz | 0:5350a66d5279 | 1484 | BUF->optdata[3] = (UIP_TCP_MSS) & 255; |
hudakz | 0:5350a66d5279 | 1485 | uip_len = UIP_IPTCPH_LEN + TCP_OPT_MSS_LEN; |
hudakz | 0:5350a66d5279 | 1486 | BUF->tcpoffset = ((UIP_TCPH_LEN + TCP_OPT_MSS_LEN) / 4) << 4; |
hudakz | 0:5350a66d5279 | 1487 | goto tcp_send; |
hudakz | 0:5350a66d5279 | 1488 | |
hudakz | 0:5350a66d5279 | 1489 | /* This label will be jumped to if we found an active connection. */ |
hudakz | 0:5350a66d5279 | 1490 | found: |
hudakz | 0:5350a66d5279 | 1491 | uip_conn = uip_connr; |
hudakz | 0:5350a66d5279 | 1492 | uip_flags = 0; |
hudakz | 0:5350a66d5279 | 1493 | |
hudakz | 0:5350a66d5279 | 1494 | /* We do a very naive form of TCP reset processing; we just accept |
hudakz | 0:5350a66d5279 | 1495 | any RST and kill our connection. We should in fact check if the |
hudakz | 0:5350a66d5279 | 1496 | sequence number of this reset is wihtin our advertised window |
hudakz | 0:5350a66d5279 | 1497 | before we accept the reset. */ |
hudakz | 0:5350a66d5279 | 1498 | if(BUF->flags & TCP_RST) { |
hudakz | 0:5350a66d5279 | 1499 | uip_connr->tcpstateflags = UIP_CLOSED; |
hudakz | 0:5350a66d5279 | 1500 | UIP_LOG("tcp: got reset, aborting connection."); |
hudakz | 0:5350a66d5279 | 1501 | uip_flags = UIP_ABORT; |
hudakz | 0:5350a66d5279 | 1502 | UIP_APPCALL(); |
hudakz | 0:5350a66d5279 | 1503 | goto drop; |
hudakz | 0:5350a66d5279 | 1504 | } |
hudakz | 0:5350a66d5279 | 1505 | |
hudakz | 0:5350a66d5279 | 1506 | /* Calculated the length of the data, if the application has sent |
hudakz | 0:5350a66d5279 | 1507 | any data to us. */ |
hudakz | 0:5350a66d5279 | 1508 | c = (BUF->tcpoffset >> 4) << 2; |
hudakz | 0:5350a66d5279 | 1509 | |
hudakz | 0:5350a66d5279 | 1510 | /* uip_len will contain the length of the actual TCP data. This is |
hudakz | 0:5350a66d5279 | 1511 | calculated by subtracing the length of the TCP header (in |
hudakz | 0:5350a66d5279 | 1512 | c) and the length of the IP header (20 bytes). */ |
hudakz | 0:5350a66d5279 | 1513 | uip_len = uip_len - c - UIP_IPH_LEN; |
hudakz | 0:5350a66d5279 | 1514 | |
hudakz | 0:5350a66d5279 | 1515 | /* First, check if the sequence number of the incoming packet is |
hudakz | 0:5350a66d5279 | 1516 | what we're expecting next. If not, we send out an ACK with the |
hudakz | 0:5350a66d5279 | 1517 | correct numbers in. */ |
hudakz | 0:5350a66d5279 | 1518 | if(!(((uip_connr->tcpstateflags & UIP_TS_MASK) == UIP_SYN_SENT) && ((BUF->flags & TCP_CTL) == (TCP_SYN | TCP_ACK)))) { |
hudakz | 0:5350a66d5279 | 1519 | if |
hudakz | 0:5350a66d5279 | 1520 | ( |
hudakz | 0:5350a66d5279 | 1521 | (uip_len > 0 || ((BUF->flags & (TCP_SYN | TCP_FIN)) != 0)) |
hudakz | 0:5350a66d5279 | 1522 | && ( |
hudakz | 0:5350a66d5279 | 1523 | BUF->seqno[0] != uip_connr->rcv_nxt[0] |
hudakz | 0:5350a66d5279 | 1524 | || BUF->seqno[1] != uip_connr->rcv_nxt[1] |
hudakz | 0:5350a66d5279 | 1525 | || BUF->seqno[2] != uip_connr->rcv_nxt[2] |
hudakz | 0:5350a66d5279 | 1526 | || BUF->seqno[3] != uip_connr->rcv_nxt[3] |
hudakz | 0:5350a66d5279 | 1527 | ) |
hudakz | 0:5350a66d5279 | 1528 | ) { |
hudakz | 0:5350a66d5279 | 1529 | goto tcp_send_ack; |
hudakz | 0:5350a66d5279 | 1530 | } |
hudakz | 0:5350a66d5279 | 1531 | } |
hudakz | 0:5350a66d5279 | 1532 | |
hudakz | 0:5350a66d5279 | 1533 | /* Next, check if the incoming segment acknowledges any outstanding |
hudakz | 0:5350a66d5279 | 1534 | data. If so, we update the sequence number, reset the length of |
hudakz | 0:5350a66d5279 | 1535 | the outstanding data, calculate RTT estimations, and reset the |
hudakz | 0:5350a66d5279 | 1536 | retransmission timer. */ |
hudakz | 0:5350a66d5279 | 1537 | if((BUF->flags & TCP_ACK) && uip_outstanding(uip_connr)) { |
hudakz | 0:5350a66d5279 | 1538 | uip_add32(uip_connr->snd_nxt, uip_connr->len); |
hudakz | 0:5350a66d5279 | 1539 | |
hudakz | 0:5350a66d5279 | 1540 | if |
hudakz | 0:5350a66d5279 | 1541 | ( |
hudakz | 0:5350a66d5279 | 1542 | BUF->ackno[0] == uip_acc32[0] |
hudakz | 0:5350a66d5279 | 1543 | && BUF->ackno[1] == uip_acc32[1] |
hudakz | 0:5350a66d5279 | 1544 | && BUF->ackno[2] == uip_acc32[2] |
hudakz | 0:5350a66d5279 | 1545 | && BUF->ackno[3] == uip_acc32[3] |
hudakz | 0:5350a66d5279 | 1546 | ) { |
hudakz | 0:5350a66d5279 | 1547 | |
hudakz | 0:5350a66d5279 | 1548 | /* Update sequence number. */ |
hudakz | 0:5350a66d5279 | 1549 | uip_connr->snd_nxt[0] = uip_acc32[0]; |
hudakz | 0:5350a66d5279 | 1550 | uip_connr->snd_nxt[1] = uip_acc32[1]; |
hudakz | 0:5350a66d5279 | 1551 | uip_connr->snd_nxt[2] = uip_acc32[2]; |
hudakz | 0:5350a66d5279 | 1552 | uip_connr->snd_nxt[3] = uip_acc32[3]; |
hudakz | 0:5350a66d5279 | 1553 | |
hudakz | 0:5350a66d5279 | 1554 | /* Do RTT estimation, unless we have done retransmissions. */ |
hudakz | 0:5350a66d5279 | 1555 | if(uip_connr->nrtx == 0) { |
hudakz | 0:5350a66d5279 | 1556 | signed char m; |
hudakz | 0:5350a66d5279 | 1557 | m = uip_connr->rto - uip_connr->timer; |
hudakz | 0:5350a66d5279 | 1558 | |
hudakz | 0:5350a66d5279 | 1559 | /* This is taken directly from VJs original code in his paper */ |
hudakz | 0:5350a66d5279 | 1560 | m = m - (uip_connr->sa >> 3); |
hudakz | 0:5350a66d5279 | 1561 | uip_connr->sa += m; |
hudakz | 0:5350a66d5279 | 1562 | if(m < 0) { |
hudakz | 0:5350a66d5279 | 1563 | m = -m; |
hudakz | 0:5350a66d5279 | 1564 | } |
hudakz | 0:5350a66d5279 | 1565 | |
hudakz | 0:5350a66d5279 | 1566 | m = m - (uip_connr->sv >> 2); |
hudakz | 0:5350a66d5279 | 1567 | uip_connr->sv += m; |
hudakz | 0:5350a66d5279 | 1568 | uip_connr->rto = (uip_connr->sa >> 3) + uip_connr->sv; |
hudakz | 0:5350a66d5279 | 1569 | } |
hudakz | 0:5350a66d5279 | 1570 | |
hudakz | 0:5350a66d5279 | 1571 | /* Set the acknowledged flag. */ |
hudakz | 0:5350a66d5279 | 1572 | uip_flags = UIP_ACKDATA; |
hudakz | 0:5350a66d5279 | 1573 | |
hudakz | 0:5350a66d5279 | 1574 | /* Reset the retransmission timer. */ |
hudakz | 0:5350a66d5279 | 1575 | uip_connr->timer = uip_connr->rto; |
hudakz | 0:5350a66d5279 | 1576 | |
hudakz | 0:5350a66d5279 | 1577 | /* Reset length of outstanding data. */ |
hudakz | 0:5350a66d5279 | 1578 | uip_connr->len = 0; |
hudakz | 0:5350a66d5279 | 1579 | } |
hudakz | 0:5350a66d5279 | 1580 | } |
hudakz | 0:5350a66d5279 | 1581 | |
hudakz | 0:5350a66d5279 | 1582 | /* Do different things depending on in what state the connection is. */ |
hudakz | 0:5350a66d5279 | 1583 | switch(uip_connr->tcpstateflags & UIP_TS_MASK) { |
hudakz | 0:5350a66d5279 | 1584 | /* CLOSED and LISTEN are not handled here. CLOSE_WAIT is not |
hudakz | 0:5350a66d5279 | 1585 | implemented, since we force the application to close when the |
hudakz | 0:5350a66d5279 | 1586 | peer sends a FIN (hence the application goes directly from |
hudakz | 0:5350a66d5279 | 1587 | ESTABLISHED to LAST_ACK). */ |
hudakz | 0:5350a66d5279 | 1588 | case UIP_SYN_RCVD: |
hudakz | 0:5350a66d5279 | 1589 | /* In SYN_RCVD we have sent out a SYNACK in response to a SYN, and |
hudakz | 0:5350a66d5279 | 1590 | we are waiting for an ACK that acknowledges the data we sent |
hudakz | 0:5350a66d5279 | 1591 | out the last time. Therefore, we want to have the UIP_ACKDATA |
hudakz | 0:5350a66d5279 | 1592 | flag set. If so, we enter the ESTABLISHED state. */ |
hudakz | 0:5350a66d5279 | 1593 | if(uip_flags & UIP_ACKDATA) { |
hudakz | 0:5350a66d5279 | 1594 | uip_connr->tcpstateflags = UIP_ESTABLISHED; |
hudakz | 0:5350a66d5279 | 1595 | uip_flags = UIP_CONNECTED; |
hudakz | 0:5350a66d5279 | 1596 | uip_connr->len = 0; |
hudakz | 0:5350a66d5279 | 1597 | if(uip_len > 0) { |
hudakz | 0:5350a66d5279 | 1598 | uip_flags |= UIP_NEWDATA; |
hudakz | 0:5350a66d5279 | 1599 | uip_add_rcv_nxt(uip_len); |
hudakz | 0:5350a66d5279 | 1600 | } |
hudakz | 0:5350a66d5279 | 1601 | |
hudakz | 0:5350a66d5279 | 1602 | uip_slen = 0; |
hudakz | 0:5350a66d5279 | 1603 | UIP_APPCALL(); |
hudakz | 0:5350a66d5279 | 1604 | goto appsend; |
hudakz | 0:5350a66d5279 | 1605 | } |
hudakz | 0:5350a66d5279 | 1606 | |
hudakz | 0:5350a66d5279 | 1607 | goto drop; |
hudakz | 0:5350a66d5279 | 1608 | #if UIP_ACTIVE_OPEN |
hudakz | 0:5350a66d5279 | 1609 | |
hudakz | 0:5350a66d5279 | 1610 | case UIP_SYN_SENT: |
hudakz | 0:5350a66d5279 | 1611 | /* In SYN_SENT, we wait for a SYNACK that is sent in response to |
hudakz | 0:5350a66d5279 | 1612 | our SYN. The rcv_nxt is set to sequence number in the SYNACK |
hudakz | 0:5350a66d5279 | 1613 | plus one, and we send an ACK. We move into the ESTABLISHED |
hudakz | 0:5350a66d5279 | 1614 | state. */ |
hudakz | 0:5350a66d5279 | 1615 | if((uip_flags & UIP_ACKDATA) && (BUF->flags & TCP_CTL) == (TCP_SYN | TCP_ACK)) { |
hudakz | 0:5350a66d5279 | 1616 | |
hudakz | 0:5350a66d5279 | 1617 | /* Parse the TCP MSS option, if present. */ |
hudakz | 0:5350a66d5279 | 1618 | if((BUF->tcpoffset & 0xf0) > 0x50) { |
hudakz | 0:5350a66d5279 | 1619 | for(c = 0; c < ((BUF->tcpoffset >> 4) - 5) << 2;) { |
hudakz | 0:5350a66d5279 | 1620 | opt = uip_buf[UIP_IPTCPH_LEN + UIP_LLH_LEN + c]; |
hudakz | 0:5350a66d5279 | 1621 | if(opt == TCP_OPT_END) { |
hudakz | 0:5350a66d5279 | 1622 | |
hudakz | 0:5350a66d5279 | 1623 | /* End of options. */ |
hudakz | 0:5350a66d5279 | 1624 | break; |
hudakz | 0:5350a66d5279 | 1625 | } |
hudakz | 0:5350a66d5279 | 1626 | else |
hudakz | 0:5350a66d5279 | 1627 | if(opt == TCP_OPT_NOOP) { |
hudakz | 0:5350a66d5279 | 1628 | ++c; |
hudakz | 0:5350a66d5279 | 1629 | |
hudakz | 0:5350a66d5279 | 1630 | /* NOP option. */ |
hudakz | 0:5350a66d5279 | 1631 | } |
hudakz | 0:5350a66d5279 | 1632 | else |
hudakz | 0:5350a66d5279 | 1633 | if(opt == TCP_OPT_MSS && uip_buf[UIP_TCPIP_HLEN + UIP_LLH_LEN + 1 + c] == TCP_OPT_MSS_LEN) { |
hudakz | 0:5350a66d5279 | 1634 | |
hudakz | 0:5350a66d5279 | 1635 | /* An MSS option with the right option length. */ |
hudakz | 0:5350a66d5279 | 1636 | tmp16 = (uip_buf[UIP_TCPIP_HLEN + UIP_LLH_LEN + 2 + c] << 8) | uip_buf[UIP_TCPIP_HLEN + UIP_LLH_LEN + 3 + c]; |
hudakz | 0:5350a66d5279 | 1637 | uip_connr->initialmss = uip_connr->mss = tmp16 > UIP_TCP_MSS ? UIP_TCP_MSS : tmp16; |
hudakz | 0:5350a66d5279 | 1638 | |
hudakz | 0:5350a66d5279 | 1639 | /* And we are done processing options. */ |
hudakz | 0:5350a66d5279 | 1640 | break; |
hudakz | 0:5350a66d5279 | 1641 | } |
hudakz | 0:5350a66d5279 | 1642 | else { |
hudakz | 0:5350a66d5279 | 1643 | |
hudakz | 0:5350a66d5279 | 1644 | /* All other options have a length field, so that we easily |
hudakz | 0:5350a66d5279 | 1645 | can skip past them. */ |
hudakz | 0:5350a66d5279 | 1646 | if(uip_buf[UIP_TCPIP_HLEN + UIP_LLH_LEN + 1 + c] == 0) { |
hudakz | 0:5350a66d5279 | 1647 | |
hudakz | 0:5350a66d5279 | 1648 | /* If the length field is zero, the options are malformed |
hudakz | 0:5350a66d5279 | 1649 | and we don't process them further. */ |
hudakz | 0:5350a66d5279 | 1650 | break; |
hudakz | 0:5350a66d5279 | 1651 | } |
hudakz | 0:5350a66d5279 | 1652 | |
hudakz | 0:5350a66d5279 | 1653 | c += uip_buf[UIP_TCPIP_HLEN + UIP_LLH_LEN + 1 + c]; |
hudakz | 0:5350a66d5279 | 1654 | } |
hudakz | 0:5350a66d5279 | 1655 | } |
hudakz | 0:5350a66d5279 | 1656 | } |
hudakz | 0:5350a66d5279 | 1657 | |
hudakz | 0:5350a66d5279 | 1658 | uip_connr->tcpstateflags = UIP_ESTABLISHED; |
hudakz | 0:5350a66d5279 | 1659 | uip_connr->rcv_nxt[0] = BUF->seqno[0]; |
hudakz | 0:5350a66d5279 | 1660 | uip_connr->rcv_nxt[1] = BUF->seqno[1]; |
hudakz | 0:5350a66d5279 | 1661 | uip_connr->rcv_nxt[2] = BUF->seqno[2]; |
hudakz | 0:5350a66d5279 | 1662 | uip_connr->rcv_nxt[3] = BUF->seqno[3]; |
hudakz | 0:5350a66d5279 | 1663 | uip_add_rcv_nxt(1); |
hudakz | 0:5350a66d5279 | 1664 | uip_flags = UIP_CONNECTED | UIP_NEWDATA; |
hudakz | 0:5350a66d5279 | 1665 | uip_connr->len = 0; |
hudakz | 0:5350a66d5279 | 1666 | uip_len = 0; |
hudakz | 0:5350a66d5279 | 1667 | uip_slen = 0; |
hudakz | 0:5350a66d5279 | 1668 | UIP_APPCALL(); |
hudakz | 0:5350a66d5279 | 1669 | goto appsend; |
hudakz | 0:5350a66d5279 | 1670 | } |
hudakz | 0:5350a66d5279 | 1671 | |
hudakz | 0:5350a66d5279 | 1672 | /* Inform the application that the connection failed */ |
hudakz | 0:5350a66d5279 | 1673 | uip_flags = UIP_ABORT; |
hudakz | 0:5350a66d5279 | 1674 | UIP_APPCALL(); |
hudakz | 0:5350a66d5279 | 1675 | |
hudakz | 0:5350a66d5279 | 1676 | /* The connection is closed after we send the RST */ |
hudakz | 0:5350a66d5279 | 1677 | uip_conn->tcpstateflags = UIP_CLOSED; |
hudakz | 0:5350a66d5279 | 1678 | goto reset; |
hudakz | 0:5350a66d5279 | 1679 | #endif /* UIP_ACTIVE_OPEN */ |
hudakz | 0:5350a66d5279 | 1680 | |
hudakz | 0:5350a66d5279 | 1681 | case UIP_ESTABLISHED: |
hudakz | 0:5350a66d5279 | 1682 | /* In the ESTABLISHED state, we call upon the application to feed |
hudakz | 0:5350a66d5279 | 1683 | data into the uip_buf. If the UIP_ACKDATA flag is set, the |
hudakz | 0:5350a66d5279 | 1684 | application should put new data into the buffer, otherwise we are |
hudakz | 0:5350a66d5279 | 1685 | retransmitting an old segment, and the application should put that |
hudakz | 0:5350a66d5279 | 1686 | data into the buffer. |
hudakz | 0:5350a66d5279 | 1687 | |
hudakz | 0:5350a66d5279 | 1688 | If the incoming packet is a FIN, we should close the connection on |
hudakz | 0:5350a66d5279 | 1689 | this side as well, and we send out a FIN and enter the LAST_ACK |
hudakz | 0:5350a66d5279 | 1690 | state. We require that there is no outstanding data; otherwise the |
hudakz | 0:5350a66d5279 | 1691 | sequence numbers will be screwed up. */ |
hudakz | 0:5350a66d5279 | 1692 | if(BUF->flags & TCP_FIN && !(uip_connr->tcpstateflags & UIP_STOPPED)) { |
hudakz | 0:5350a66d5279 | 1693 | if(uip_outstanding(uip_connr)) { |
hudakz | 0:5350a66d5279 | 1694 | goto drop; |
hudakz | 0:5350a66d5279 | 1695 | } |
hudakz | 0:5350a66d5279 | 1696 | |
hudakz | 0:5350a66d5279 | 1697 | uip_add_rcv_nxt(1 + uip_len); |
hudakz | 0:5350a66d5279 | 1698 | uip_flags |= UIP_CLOSE; |
hudakz | 0:5350a66d5279 | 1699 | if(uip_len > 0) { |
hudakz | 0:5350a66d5279 | 1700 | uip_flags |= UIP_NEWDATA; |
hudakz | 0:5350a66d5279 | 1701 | } |
hudakz | 0:5350a66d5279 | 1702 | |
hudakz | 0:5350a66d5279 | 1703 | UIP_APPCALL(); |
hudakz | 0:5350a66d5279 | 1704 | uip_connr->len = 1; |
hudakz | 0:5350a66d5279 | 1705 | uip_connr->tcpstateflags = UIP_LAST_ACK; |
hudakz | 0:5350a66d5279 | 1706 | uip_connr->nrtx = 0; |
hudakz | 0:5350a66d5279 | 1707 | tcp_send_finack: |
hudakz | 0:5350a66d5279 | 1708 | BUF->flags = TCP_FIN | TCP_ACK; |
hudakz | 0:5350a66d5279 | 1709 | goto tcp_send_nodata; |
hudakz | 0:5350a66d5279 | 1710 | } |
hudakz | 0:5350a66d5279 | 1711 | |
hudakz | 0:5350a66d5279 | 1712 | /* Check the URG flag. If this is set, the segment carries urgent |
hudakz | 0:5350a66d5279 | 1713 | data that we must pass to the application. */ |
hudakz | 0:5350a66d5279 | 1714 | if((BUF->flags & TCP_URG) != 0) |
hudakz | 0:5350a66d5279 | 1715 | { |
hudakz | 0:5350a66d5279 | 1716 | #if UIP_URGDATA > 0 |
hudakz | 0:5350a66d5279 | 1717 | uip_urglen = (BUF->urgp[0] << 8) | BUF->urgp[1]; |
hudakz | 0:5350a66d5279 | 1718 | if(uip_urglen > uip_len) { |
hudakz | 0:5350a66d5279 | 1719 | |
hudakz | 0:5350a66d5279 | 1720 | /* There is more urgent data in the next segment to come. */ |
hudakz | 0:5350a66d5279 | 1721 | uip_urglen = uip_len; |
hudakz | 0:5350a66d5279 | 1722 | } |
hudakz | 0:5350a66d5279 | 1723 | |
hudakz | 0:5350a66d5279 | 1724 | uip_add_rcv_nxt(uip_urglen); |
hudakz | 0:5350a66d5279 | 1725 | uip_len -= uip_urglen; |
hudakz | 0:5350a66d5279 | 1726 | uip_urgdata = uip_appdata; |
hudakz | 0:5350a66d5279 | 1727 | uip_appdata += uip_urglen; |
hudakz | 0:5350a66d5279 | 1728 | } |
hudakz | 0:5350a66d5279 | 1729 | else { |
hudakz | 0:5350a66d5279 | 1730 | uip_urglen = 0; |
hudakz | 0:5350a66d5279 | 1731 | #else /* UIP_URGDATA > 0 */ |
hudakz | 0:5350a66d5279 | 1732 | uip_appdata = ((char*)uip_appdata) + ((BUF->urgp[0] << 8) | BUF->urgp[1]); |
hudakz | 0:5350a66d5279 | 1733 | uip_len -= (BUF->urgp[0] << 8) | BUF->urgp[1]; |
hudakz | 0:5350a66d5279 | 1734 | #endif /* UIP_URGDATA > 0 */ |
hudakz | 0:5350a66d5279 | 1735 | } |
hudakz | 0:5350a66d5279 | 1736 | |
hudakz | 0:5350a66d5279 | 1737 | /* If uip_len > 0 we have TCP data in the packet, and we flag this |
hudakz | 0:5350a66d5279 | 1738 | by setting the UIP_NEWDATA flag and update the sequence number |
hudakz | 0:5350a66d5279 | 1739 | we acknowledge. If the application has stopped the dataflow |
hudakz | 0:5350a66d5279 | 1740 | using uip_stop(), we must not accept any data packets from the |
hudakz | 0:5350a66d5279 | 1741 | remote host. */ |
hudakz | 0:5350a66d5279 | 1742 | if(uip_len > 0 && !(uip_connr->tcpstateflags & UIP_STOPPED)) { |
hudakz | 0:5350a66d5279 | 1743 | uip_flags |= UIP_NEWDATA; |
hudakz | 0:5350a66d5279 | 1744 | uip_add_rcv_nxt(uip_len); |
hudakz | 0:5350a66d5279 | 1745 | } |
hudakz | 0:5350a66d5279 | 1746 | |
hudakz | 0:5350a66d5279 | 1747 | /* Check if the available buffer space advertised by the other end |
hudakz | 0:5350a66d5279 | 1748 | is smaller than the initial MSS for this connection. If so, we |
hudakz | 0:5350a66d5279 | 1749 | set the current MSS to the window size to ensure that the |
hudakz | 0:5350a66d5279 | 1750 | application does not send more data than the other end can |
hudakz | 0:5350a66d5279 | 1751 | handle. |
hudakz | 0:5350a66d5279 | 1752 | |
hudakz | 0:5350a66d5279 | 1753 | If the remote host advertises a zero window, we set the MSS to |
hudakz | 0:5350a66d5279 | 1754 | the initial MSS so that the application will send an entire MSS |
hudakz | 0:5350a66d5279 | 1755 | of data. This data will not be acknowledged by the receiver, |
hudakz | 0:5350a66d5279 | 1756 | and the application will retransmit it. This is called the |
hudakz | 0:5350a66d5279 | 1757 | "persistent timer" and uses the retransmission mechanim. |
hudakz | 0:5350a66d5279 | 1758 | */ |
hudakz | 0:5350a66d5279 | 1759 | tmp16 = ((u16_t) BUF->wnd[0] << 8) + (u16_t) BUF->wnd[1]; |
hudakz | 0:5350a66d5279 | 1760 | if(tmp16 > uip_connr->initialmss || tmp16 == 0) { |
hudakz | 0:5350a66d5279 | 1761 | tmp16 = uip_connr->initialmss; |
hudakz | 0:5350a66d5279 | 1762 | } |
hudakz | 0:5350a66d5279 | 1763 | |
hudakz | 0:5350a66d5279 | 1764 | uip_connr->mss = tmp16; |
hudakz | 0:5350a66d5279 | 1765 | |
hudakz | 0:5350a66d5279 | 1766 | /* If this packet constitutes an ACK for outstanding data (flagged |
hudakz | 0:5350a66d5279 | 1767 | by the UIP_ACKDATA flag, we should call the application since it |
hudakz | 0:5350a66d5279 | 1768 | might want to send more data. If the incoming packet had data |
hudakz | 0:5350a66d5279 | 1769 | from the peer (as flagged by the UIP_NEWDATA flag), the |
hudakz | 0:5350a66d5279 | 1770 | application must also be notified. |
hudakz | 0:5350a66d5279 | 1771 | |
hudakz | 0:5350a66d5279 | 1772 | When the application is called, the global variable uip_len |
hudakz | 0:5350a66d5279 | 1773 | contains the length of the incoming data. The application can |
hudakz | 0:5350a66d5279 | 1774 | access the incoming data through the global pointer |
hudakz | 0:5350a66d5279 | 1775 | uip_appdata, which usually points UIP_IPTCPH_LEN + UIP_LLH_LEN |
hudakz | 0:5350a66d5279 | 1776 | bytes into the uip_buf array. |
hudakz | 0:5350a66d5279 | 1777 | |
hudakz | 0:5350a66d5279 | 1778 | If the application wishes to send any data, this data should be |
hudakz | 0:5350a66d5279 | 1779 | put into the uip_appdata and the length of the data should be |
hudakz | 0:5350a66d5279 | 1780 | put into uip_len. If the application don't have any data to |
hudakz | 0:5350a66d5279 | 1781 | send, uip_len must be set to 0. */ |
hudakz | 0:5350a66d5279 | 1782 | if(uip_flags & (UIP_NEWDATA | UIP_ACKDATA)) { |
hudakz | 0:5350a66d5279 | 1783 | uip_slen = 0; |
hudakz | 0:5350a66d5279 | 1784 | UIP_APPCALL(); |
hudakz | 0:5350a66d5279 | 1785 | |
hudakz | 0:5350a66d5279 | 1786 | appsend: |
hudakz | 0:5350a66d5279 | 1787 | if(uip_flags & UIP_ABORT) { |
hudakz | 0:5350a66d5279 | 1788 | uip_slen = 0; |
hudakz | 0:5350a66d5279 | 1789 | uip_connr->tcpstateflags = UIP_CLOSED; |
hudakz | 0:5350a66d5279 | 1790 | BUF->flags = TCP_RST | TCP_ACK; |
hudakz | 0:5350a66d5279 | 1791 | goto tcp_send_nodata; |
hudakz | 0:5350a66d5279 | 1792 | } |
hudakz | 0:5350a66d5279 | 1793 | |
hudakz | 0:5350a66d5279 | 1794 | if(uip_flags & UIP_CLOSE) { |
hudakz | 0:5350a66d5279 | 1795 | uip_slen = 0; |
hudakz | 0:5350a66d5279 | 1796 | uip_connr->len = 1; |
hudakz | 0:5350a66d5279 | 1797 | uip_connr->tcpstateflags = UIP_FIN_WAIT_1; |
hudakz | 0:5350a66d5279 | 1798 | uip_connr->nrtx = 0; |
hudakz | 0:5350a66d5279 | 1799 | BUF->flags = TCP_FIN | TCP_ACK; |
hudakz | 0:5350a66d5279 | 1800 | goto tcp_send_nodata; |
hudakz | 0:5350a66d5279 | 1801 | } |
hudakz | 0:5350a66d5279 | 1802 | |
hudakz | 0:5350a66d5279 | 1803 | /* If uip_slen > 0, the application has data to be sent. */ |
hudakz | 0:5350a66d5279 | 1804 | if(uip_slen > 0) { |
hudakz | 0:5350a66d5279 | 1805 | |
hudakz | 0:5350a66d5279 | 1806 | /* If the connection has acknowledged data, the contents of |
hudakz | 0:5350a66d5279 | 1807 | the ->len variable should be discarded. */ |
hudakz | 0:5350a66d5279 | 1808 | if((uip_flags & UIP_ACKDATA) != 0) { |
hudakz | 0:5350a66d5279 | 1809 | uip_connr->len = 0; |
hudakz | 0:5350a66d5279 | 1810 | } |
hudakz | 0:5350a66d5279 | 1811 | |
hudakz | 0:5350a66d5279 | 1812 | /* If the ->len variable is non-zero the connection has |
hudakz | 0:5350a66d5279 | 1813 | already data in transit and cannot send anymore right |
hudakz | 0:5350a66d5279 | 1814 | now. */ |
hudakz | 0:5350a66d5279 | 1815 | if(uip_connr->len == 0) { |
hudakz | 0:5350a66d5279 | 1816 | |
hudakz | 0:5350a66d5279 | 1817 | /* The application cannot send more than what is allowed by |
hudakz | 0:5350a66d5279 | 1818 | the mss (the minumum of the MSS and the available |
hudakz | 0:5350a66d5279 | 1819 | window). */ |
hudakz | 0:5350a66d5279 | 1820 | if(uip_slen > uip_connr->mss) { |
hudakz | 0:5350a66d5279 | 1821 | uip_slen = uip_connr->mss; |
hudakz | 0:5350a66d5279 | 1822 | } |
hudakz | 0:5350a66d5279 | 1823 | |
hudakz | 0:5350a66d5279 | 1824 | /* Remember how much data we send out now so that we know |
hudakz | 0:5350a66d5279 | 1825 | when everything has been acknowledged. */ |
hudakz | 0:5350a66d5279 | 1826 | uip_connr->len = uip_slen; |
hudakz | 0:5350a66d5279 | 1827 | } |
hudakz | 0:5350a66d5279 | 1828 | else { |
hudakz | 0:5350a66d5279 | 1829 | |
hudakz | 0:5350a66d5279 | 1830 | /* If the application already had unacknowledged data, we |
hudakz | 0:5350a66d5279 | 1831 | make sure that the application does not send (i.e., |
hudakz | 0:5350a66d5279 | 1832 | retransmit) out more than it previously sent out. */ |
hudakz | 0:5350a66d5279 | 1833 | uip_slen = uip_connr->len; |
hudakz | 0:5350a66d5279 | 1834 | } |
hudakz | 0:5350a66d5279 | 1835 | } |
hudakz | 0:5350a66d5279 | 1836 | |
hudakz | 0:5350a66d5279 | 1837 | uip_connr->nrtx = 0; |
hudakz | 0:5350a66d5279 | 1838 | apprexmit: |
hudakz | 0:5350a66d5279 | 1839 | uip_appdata = uip_sappdata; |
hudakz | 0:5350a66d5279 | 1840 | |
hudakz | 0:5350a66d5279 | 1841 | /* If the application has data to be sent, or if the incoming |
hudakz | 0:5350a66d5279 | 1842 | packet had new data in it, we must send out a packet. */ |
hudakz | 0:5350a66d5279 | 1843 | if(uip_slen > 0 && uip_connr->len > 0) { |
hudakz | 0:5350a66d5279 | 1844 | |
hudakz | 0:5350a66d5279 | 1845 | /* Add the length of the IP and TCP headers. */ |
hudakz | 0:5350a66d5279 | 1846 | uip_len = uip_connr->len + UIP_TCPIP_HLEN; |
hudakz | 0:5350a66d5279 | 1847 | |
hudakz | 0:5350a66d5279 | 1848 | /* We always set the ACK flag in response packets. */ |
hudakz | 0:5350a66d5279 | 1849 | BUF->flags = TCP_ACK | TCP_PSH; |
hudakz | 0:5350a66d5279 | 1850 | |
hudakz | 0:5350a66d5279 | 1851 | /* Send the packet. */ |
hudakz | 0:5350a66d5279 | 1852 | goto tcp_send_noopts; |
hudakz | 0:5350a66d5279 | 1853 | } |
hudakz | 0:5350a66d5279 | 1854 | |
hudakz | 0:5350a66d5279 | 1855 | /* If there is no data to send, just send out a pure ACK if |
hudakz | 0:5350a66d5279 | 1856 | there is newdata. */ |
hudakz | 0:5350a66d5279 | 1857 | if(uip_flags & UIP_NEWDATA) { |
hudakz | 0:5350a66d5279 | 1858 | uip_len = UIP_TCPIP_HLEN; |
hudakz | 0:5350a66d5279 | 1859 | BUF->flags = TCP_ACK; |
hudakz | 0:5350a66d5279 | 1860 | goto tcp_send_noopts; |
hudakz | 0:5350a66d5279 | 1861 | } |
hudakz | 0:5350a66d5279 | 1862 | } |
hudakz | 0:5350a66d5279 | 1863 | |
hudakz | 0:5350a66d5279 | 1864 | goto drop; |
hudakz | 0:5350a66d5279 | 1865 | |
hudakz | 0:5350a66d5279 | 1866 | case UIP_LAST_ACK: |
hudakz | 0:5350a66d5279 | 1867 | /* We can close this connection if the peer has acknowledged our |
hudakz | 0:5350a66d5279 | 1868 | FIN. This is indicated by the UIP_ACKDATA flag. */ |
hudakz | 0:5350a66d5279 | 1869 | if(uip_flags & UIP_ACKDATA) { |
hudakz | 0:5350a66d5279 | 1870 | uip_connr->tcpstateflags = UIP_CLOSED; |
hudakz | 0:5350a66d5279 | 1871 | uip_flags = UIP_CLOSE; |
hudakz | 0:5350a66d5279 | 1872 | UIP_APPCALL(); |
hudakz | 0:5350a66d5279 | 1873 | } |
hudakz | 0:5350a66d5279 | 1874 | break; |
hudakz | 0:5350a66d5279 | 1875 | |
hudakz | 0:5350a66d5279 | 1876 | case UIP_FIN_WAIT_1: |
hudakz | 0:5350a66d5279 | 1877 | /* The application has closed the connection, but the remote host |
hudakz | 0:5350a66d5279 | 1878 | hasn't closed its end yet. Thus we do nothing but wait for a |
hudakz | 0:5350a66d5279 | 1879 | FIN from the other side. */ |
hudakz | 0:5350a66d5279 | 1880 | if(uip_len > 0) { |
hudakz | 0:5350a66d5279 | 1881 | uip_add_rcv_nxt(uip_len); |
hudakz | 0:5350a66d5279 | 1882 | } |
hudakz | 0:5350a66d5279 | 1883 | |
hudakz | 0:5350a66d5279 | 1884 | if(BUF->flags & TCP_FIN) { |
hudakz | 0:5350a66d5279 | 1885 | if(uip_flags & UIP_ACKDATA) { |
hudakz | 0:5350a66d5279 | 1886 | uip_connr->tcpstateflags = UIP_TIME_WAIT; |
hudakz | 0:5350a66d5279 | 1887 | uip_connr->timer = 0; |
hudakz | 0:5350a66d5279 | 1888 | uip_connr->len = 0; |
hudakz | 0:5350a66d5279 | 1889 | } |
hudakz | 0:5350a66d5279 | 1890 | else { |
hudakz | 0:5350a66d5279 | 1891 | uip_connr->tcpstateflags = UIP_CLOSING; |
hudakz | 0:5350a66d5279 | 1892 | } |
hudakz | 0:5350a66d5279 | 1893 | |
hudakz | 0:5350a66d5279 | 1894 | uip_add_rcv_nxt(1); |
hudakz | 0:5350a66d5279 | 1895 | uip_flags = UIP_CLOSE; |
hudakz | 0:5350a66d5279 | 1896 | UIP_APPCALL(); |
hudakz | 0:5350a66d5279 | 1897 | goto tcp_send_ack; |
hudakz | 0:5350a66d5279 | 1898 | } |
hudakz | 0:5350a66d5279 | 1899 | else |
hudakz | 0:5350a66d5279 | 1900 | if(uip_flags & UIP_ACKDATA) { |
hudakz | 0:5350a66d5279 | 1901 | uip_connr->tcpstateflags = UIP_FIN_WAIT_2; |
hudakz | 0:5350a66d5279 | 1902 | uip_connr->len = 0; |
hudakz | 0:5350a66d5279 | 1903 | goto drop; |
hudakz | 0:5350a66d5279 | 1904 | } |
hudakz | 0:5350a66d5279 | 1905 | |
hudakz | 0:5350a66d5279 | 1906 | if(uip_len > 0) { |
hudakz | 0:5350a66d5279 | 1907 | goto tcp_send_ack; |
hudakz | 0:5350a66d5279 | 1908 | } |
hudakz | 0:5350a66d5279 | 1909 | |
hudakz | 0:5350a66d5279 | 1910 | goto drop; |
hudakz | 0:5350a66d5279 | 1911 | |
hudakz | 0:5350a66d5279 | 1912 | case UIP_FIN_WAIT_2: |
hudakz | 0:5350a66d5279 | 1913 | if(uip_len > 0) { |
hudakz | 0:5350a66d5279 | 1914 | uip_add_rcv_nxt(uip_len); |
hudakz | 0:5350a66d5279 | 1915 | } |
hudakz | 0:5350a66d5279 | 1916 | |
hudakz | 0:5350a66d5279 | 1917 | if(BUF->flags & TCP_FIN) { |
hudakz | 0:5350a66d5279 | 1918 | uip_connr->tcpstateflags = UIP_TIME_WAIT; |
hudakz | 0:5350a66d5279 | 1919 | uip_connr->timer = 0; |
hudakz | 0:5350a66d5279 | 1920 | uip_add_rcv_nxt(1); |
hudakz | 0:5350a66d5279 | 1921 | uip_flags = UIP_CLOSE; |
hudakz | 0:5350a66d5279 | 1922 | UIP_APPCALL(); |
hudakz | 0:5350a66d5279 | 1923 | goto tcp_send_ack; |
hudakz | 0:5350a66d5279 | 1924 | } |
hudakz | 0:5350a66d5279 | 1925 | |
hudakz | 0:5350a66d5279 | 1926 | if(uip_len > 0) { |
hudakz | 0:5350a66d5279 | 1927 | goto tcp_send_ack; |
hudakz | 0:5350a66d5279 | 1928 | } |
hudakz | 0:5350a66d5279 | 1929 | |
hudakz | 0:5350a66d5279 | 1930 | goto drop; |
hudakz | 0:5350a66d5279 | 1931 | |
hudakz | 0:5350a66d5279 | 1932 | case UIP_TIME_WAIT: |
hudakz | 0:5350a66d5279 | 1933 | goto tcp_send_ack; |
hudakz | 0:5350a66d5279 | 1934 | |
hudakz | 0:5350a66d5279 | 1935 | case UIP_CLOSING: |
hudakz | 0:5350a66d5279 | 1936 | if(uip_flags & UIP_ACKDATA) { |
hudakz | 0:5350a66d5279 | 1937 | uip_connr->tcpstateflags = UIP_TIME_WAIT; |
hudakz | 0:5350a66d5279 | 1938 | uip_connr->timer = 0; |
hudakz | 0:5350a66d5279 | 1939 | } |
hudakz | 0:5350a66d5279 | 1940 | } |
hudakz | 0:5350a66d5279 | 1941 | |
hudakz | 0:5350a66d5279 | 1942 | goto drop; |
hudakz | 0:5350a66d5279 | 1943 | |
hudakz | 0:5350a66d5279 | 1944 | /* We jump here when we are ready to send the packet, and just want |
hudakz | 0:5350a66d5279 | 1945 | to set the appropriate TCP sequence numbers in the TCP header. */ |
hudakz | 0:5350a66d5279 | 1946 | tcp_send_ack: |
hudakz | 0:5350a66d5279 | 1947 | BUF->flags = TCP_ACK; |
hudakz | 0:5350a66d5279 | 1948 | tcp_send_nodata: |
hudakz | 0:5350a66d5279 | 1949 | uip_len = UIP_IPTCPH_LEN; |
hudakz | 0:5350a66d5279 | 1950 | tcp_send_noopts: |
hudakz | 0:5350a66d5279 | 1951 | BUF->tcpoffset = (UIP_TCPH_LEN / 4) << 4; |
hudakz | 0:5350a66d5279 | 1952 | tcp_send: |
hudakz | 0:5350a66d5279 | 1953 | /* We're done with the input processing. We are now ready to send a |
hudakz | 0:5350a66d5279 | 1954 | reply. Our job is to fill in all the fields of the TCP and IP |
hudakz | 0:5350a66d5279 | 1955 | headers before calculating the checksum and finally send the |
hudakz | 0:5350a66d5279 | 1956 | packet. */ |
hudakz | 0:5350a66d5279 | 1957 | BUF->ackno[0] = uip_connr->rcv_nxt[0]; |
hudakz | 0:5350a66d5279 | 1958 | BUF->ackno[1] = uip_connr->rcv_nxt[1]; |
hudakz | 0:5350a66d5279 | 1959 | BUF->ackno[2] = uip_connr->rcv_nxt[2]; |
hudakz | 0:5350a66d5279 | 1960 | BUF->ackno[3] = uip_connr->rcv_nxt[3]; |
hudakz | 0:5350a66d5279 | 1961 | |
hudakz | 0:5350a66d5279 | 1962 | BUF->seqno[0] = uip_connr->snd_nxt[0]; |
hudakz | 0:5350a66d5279 | 1963 | BUF->seqno[1] = uip_connr->snd_nxt[1]; |
hudakz | 0:5350a66d5279 | 1964 | BUF->seqno[2] = uip_connr->snd_nxt[2]; |
hudakz | 0:5350a66d5279 | 1965 | BUF->seqno[3] = uip_connr->snd_nxt[3]; |
hudakz | 0:5350a66d5279 | 1966 | |
hudakz | 0:5350a66d5279 | 1967 | BUF->proto = UIP_PROTO_TCP; |
hudakz | 0:5350a66d5279 | 1968 | |
hudakz | 0:5350a66d5279 | 1969 | BUF->srcport = uip_connr->lport; |
hudakz | 0:5350a66d5279 | 1970 | BUF->destport = uip_connr->rport; |
hudakz | 0:5350a66d5279 | 1971 | |
hudakz | 0:5350a66d5279 | 1972 | uip_ipaddr_copy(BUF->srcipaddr, uip_hostaddr); |
hudakz | 0:5350a66d5279 | 1973 | uip_ipaddr_copy(BUF->destipaddr, uip_connr->ripaddr); |
hudakz | 0:5350a66d5279 | 1974 | |
hudakz | 0:5350a66d5279 | 1975 | if(uip_connr->tcpstateflags & UIP_STOPPED) { |
hudakz | 0:5350a66d5279 | 1976 | |
hudakz | 0:5350a66d5279 | 1977 | /* If the connection has issued uip_stop(), we advertise a zero |
hudakz | 0:5350a66d5279 | 1978 | window so that the remote host will stop sending data. */ |
hudakz | 0:5350a66d5279 | 1979 | BUF->wnd[0] = BUF->wnd[1] = 0; |
hudakz | 0:5350a66d5279 | 1980 | } |
hudakz | 0:5350a66d5279 | 1981 | else { |
hudakz | 0:5350a66d5279 | 1982 | BUF->wnd[0] = ((UIP_RECEIVE_WINDOW) >> 8); |
hudakz | 0:5350a66d5279 | 1983 | BUF->wnd[1] = ((UIP_RECEIVE_WINDOW) & 0xff); |
hudakz | 0:5350a66d5279 | 1984 | } |
hudakz | 0:5350a66d5279 | 1985 | |
hudakz | 0:5350a66d5279 | 1986 | tcp_send_noconn: |
hudakz | 0:5350a66d5279 | 1987 | BUF->ttl = UIP_TTL; |
hudakz | 0:5350a66d5279 | 1988 | #if UIP_CONF_IPV6 |
hudakz | 0:5350a66d5279 | 1989 | /* For IPv6, the IP length field does not include the IPv6 IP header |
hudakz | 0:5350a66d5279 | 1990 | length. */ |
hudakz | 0:5350a66d5279 | 1991 | |
hudakz | 0:5350a66d5279 | 1992 | BUF->len[0] = ((uip_len - UIP_IPH_LEN) >> 8); |
hudakz | 0:5350a66d5279 | 1993 | BUF->len[1] = ((uip_len - UIP_IPH_LEN) & 0xff); |
hudakz | 0:5350a66d5279 | 1994 | #else /* UIP_CONF_IPV6 */ |
hudakz | 0:5350a66d5279 | 1995 | BUF->len[0] = (uip_len >> 8); |
hudakz | 0:5350a66d5279 | 1996 | BUF->len[1] = (uip_len & 0xff); |
hudakz | 0:5350a66d5279 | 1997 | #endif /* UIP_CONF_IPV6 */ |
hudakz | 0:5350a66d5279 | 1998 | |
hudakz | 0:5350a66d5279 | 1999 | BUF->urgp[0] = BUF->urgp[1] = 0; |
hudakz | 0:5350a66d5279 | 2000 | |
hudakz | 0:5350a66d5279 | 2001 | /* Calculate TCP checksum. */ |
hudakz | 0:5350a66d5279 | 2002 | BUF->tcpchksum = 0; |
hudakz | 0:5350a66d5279 | 2003 | BUF->tcpchksum = ~(uip_tcpchksum()); |
hudakz | 0:5350a66d5279 | 2004 | |
hudakz | 0:5350a66d5279 | 2005 | ip_send_nolen: |
hudakz | 0:5350a66d5279 | 2006 | #if UIP_CONF_IPV6 |
hudakz | 0:5350a66d5279 | 2007 | BUF->vtc = 0x60; |
hudakz | 0:5350a66d5279 | 2008 | BUF->tcflow = 0x00; |
hudakz | 0:5350a66d5279 | 2009 | BUF->flow = 0x00; |
hudakz | 0:5350a66d5279 | 2010 | #else /* UIP_CONF_IPV6 */ |
hudakz | 0:5350a66d5279 | 2011 | BUF->vhl = 0x45; |
hudakz | 0:5350a66d5279 | 2012 | BUF->tos = 0; |
hudakz | 0:5350a66d5279 | 2013 | BUF->ipoffset[0] = BUF->ipoffset[1] = 0; |
hudakz | 0:5350a66d5279 | 2014 | ++ipid; |
hudakz | 0:5350a66d5279 | 2015 | BUF->ipid[0] = ipid >> 8; |
hudakz | 0:5350a66d5279 | 2016 | BUF->ipid[1] = ipid & 0xff; |
hudakz | 0:5350a66d5279 | 2017 | |
hudakz | 0:5350a66d5279 | 2018 | /* Calculate IP checksum. */ |
hudakz | 0:5350a66d5279 | 2019 | BUF->ipchksum = 0; |
hudakz | 0:5350a66d5279 | 2020 | BUF->ipchksum = ~(uip_ipchksum()); |
hudakz | 0:5350a66d5279 | 2021 | DEBUG_PRINTF("uip ip_send_nolen: chkecum 0x%04x\n", uip_ipchksum()); |
hudakz | 0:5350a66d5279 | 2022 | #endif /* UIP_CONF_IPV6 */ |
hudakz | 0:5350a66d5279 | 2023 | |
hudakz | 0:5350a66d5279 | 2024 | UIP_STAT(++uip_stat.tcp.sent); |
hudakz | 0:5350a66d5279 | 2025 | send: |
hudakz | 0:5350a66d5279 | 2026 | DEBUG_PRINTF("Sending packet with length %d (%d)\n", uip_len, (BUF->len[0] << 8) | BUF->len[1]); |
hudakz | 0:5350a66d5279 | 2027 | |
hudakz | 0:5350a66d5279 | 2028 | UIP_STAT(++uip_stat.ip.sent); |
hudakz | 0:5350a66d5279 | 2029 | |
hudakz | 0:5350a66d5279 | 2030 | /* Return and let the caller do the actual transmission. */ |
hudakz | 0:5350a66d5279 | 2031 | uip_flags = 0; |
hudakz | 0:5350a66d5279 | 2032 | return; |
hudakz | 0:5350a66d5279 | 2033 | drop: |
hudakz | 0:5350a66d5279 | 2034 | uip_len = 0; |
hudakz | 0:5350a66d5279 | 2035 | uip_flags = 0; |
hudakz | 0:5350a66d5279 | 2036 | return; |
hudakz | 0:5350a66d5279 | 2037 | } |
hudakz | 0:5350a66d5279 | 2038 | |
hudakz | 0:5350a66d5279 | 2039 | /*---------------------------------------------------------------------------*/ |
hudakz | 0:5350a66d5279 | 2040 | u16_t htons(u16_t val) { |
hudakz | 0:5350a66d5279 | 2041 | return HTONS(val); |
hudakz | 0:5350a66d5279 | 2042 | } |
hudakz | 0:5350a66d5279 | 2043 | |
hudakz | 0:5350a66d5279 | 2044 | /*---------------------------------------------------------------------------*/ |
hudakz | 0:5350a66d5279 | 2045 | void uip_send(const void* data, int len) { |
hudakz | 0:5350a66d5279 | 2046 | uip_slen = len; |
hudakz | 0:5350a66d5279 | 2047 | if(len > 0) { |
hudakz | 0:5350a66d5279 | 2048 | if(data != uip_sappdata) { |
hudakz | 0:5350a66d5279 | 2049 | memcpy(uip_sappdata, (data), uip_slen); |
hudakz | 0:5350a66d5279 | 2050 | } |
hudakz | 0:5350a66d5279 | 2051 | } |
hudakz | 0:5350a66d5279 | 2052 | } |
hudakz | 0:5350a66d5279 | 2053 | |
hudakz | 0:5350a66d5279 | 2054 | /** @} */ |