Adam Green / EthernetInterface

Deprecated fork of old network stack source from github. Please use official library instead: https://mbed.org/users/mbed_official/code/EthernetInterface/

lwip/netif/slipif.c@1:eadc868c2acf, 2013-10-26 (annotated)

Committer:
AdamGreen
Date:
Sat Oct 26 08:51:36 2013 +0000
Revision:
1:eadc868c2acf
Parent:
0:3b00827bb0b7 
Fix TCP checksum bug and stranded large TCP segments.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
AdamGreen 0:3b00827bb0b7 1 /**
AdamGreen 0:3b00827bb0b7 2 * @file
AdamGreen 0:3b00827bb0b7 3 * SLIP Interface
AdamGreen 0:3b00827bb0b7 4 *
AdamGreen 0:3b00827bb0b7 5 */
AdamGreen 0:3b00827bb0b7 6
AdamGreen 0:3b00827bb0b7 7 /*
AdamGreen 0:3b00827bb0b7 8 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
AdamGreen 0:3b00827bb0b7 9 * All rights reserved.
AdamGreen 0:3b00827bb0b7 10 *
AdamGreen 0:3b00827bb0b7 11 * Redistribution and use in source and binary forms, with or without
AdamGreen 0:3b00827bb0b7 12 * modification, are permitted provided that the following conditions
AdamGreen 0:3b00827bb0b7 13 * are met:
AdamGreen 0:3b00827bb0b7 14 * 1. Redistributions of source code must retain the above copyright
AdamGreen 0:3b00827bb0b7 15 * notice, this list of conditions and the following disclaimer.
AdamGreen 0:3b00827bb0b7 16 * 2. Redistributions in binary form must reproduce the above copyright
AdamGreen 0:3b00827bb0b7 17 * notice, this list of conditions and the following disclaimer in the
AdamGreen 0:3b00827bb0b7 18 * documentation and/or other materials provided with the distribution.
AdamGreen 0:3b00827bb0b7 19 * 3. Neither the name of the Institute nor the names of its contributors
AdamGreen 0:3b00827bb0b7 20 * may be used to endorse or promote products derived from this software
AdamGreen 0:3b00827bb0b7 21 * without specific prior written permission.
AdamGreen 0:3b00827bb0b7 22 *
AdamGreen 0:3b00827bb0b7 23 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
AdamGreen 0:3b00827bb0b7 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
AdamGreen 0:3b00827bb0b7 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
AdamGreen 0:3b00827bb0b7 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
AdamGreen 0:3b00827bb0b7 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
AdamGreen 0:3b00827bb0b7 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
AdamGreen 0:3b00827bb0b7 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
AdamGreen 0:3b00827bb0b7 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
AdamGreen 0:3b00827bb0b7 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
AdamGreen 0:3b00827bb0b7 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
AdamGreen 0:3b00827bb0b7 33 * SUCH DAMAGE.
AdamGreen 0:3b00827bb0b7 34 *
AdamGreen 0:3b00827bb0b7 35 * This file is built upon the file: src/arch/rtxc/netif/sioslip.c
AdamGreen 0:3b00827bb0b7 36 *
AdamGreen 0:3b00827bb0b7 37 * Author: Magnus Ivarsson <magnus.ivarsson(at)volvo.com>
AdamGreen 0:3b00827bb0b7 38 */
AdamGreen 0:3b00827bb0b7 39
AdamGreen 0:3b00827bb0b7 40 /*
AdamGreen 0:3b00827bb0b7 41 * This is an arch independent SLIP netif. The specific serial hooks must be
AdamGreen 0:3b00827bb0b7 42 * provided by another file. They are sio_open, sio_read/sio_tryread and sio_send
AdamGreen 0:3b00827bb0b7 43 */
AdamGreen 0:3b00827bb0b7 44
AdamGreen 0:3b00827bb0b7 45 #include "netif/slipif.h"
AdamGreen 0:3b00827bb0b7 46 #include "lwip/opt.h"
AdamGreen 0:3b00827bb0b7 47
AdamGreen 0:3b00827bb0b7 48 #if LWIP_HAVE_SLIPIF
AdamGreen 0:3b00827bb0b7 49
AdamGreen 0:3b00827bb0b7 50 #include "lwip/def.h"
AdamGreen 0:3b00827bb0b7 51 #include "lwip/pbuf.h"
AdamGreen 0:3b00827bb0b7 52 #include "lwip/sys.h"
AdamGreen 0:3b00827bb0b7 53 #include "lwip/stats.h"
AdamGreen 0:3b00827bb0b7 54 #include "lwip/snmp.h"
AdamGreen 0:3b00827bb0b7 55 #include "lwip/sio.h"
AdamGreen 0:3b00827bb0b7 56
AdamGreen 0:3b00827bb0b7 57 #define SLIP_BLOCK 1
AdamGreen 0:3b00827bb0b7 58 #define SLIP_DONTBLOCK 0
AdamGreen 0:3b00827bb0b7 59
AdamGreen 0:3b00827bb0b7 60 #define SLIP_END 0300 /* 0xC0 */
AdamGreen 0:3b00827bb0b7 61 #define SLIP_ESC 0333 /* 0xDB */
AdamGreen 0:3b00827bb0b7 62 #define SLIP_ESC_END 0334 /* 0xDC */
AdamGreen 0:3b00827bb0b7 63 #define SLIP_ESC_ESC 0335 /* 0xDD */
AdamGreen 0:3b00827bb0b7 64
AdamGreen 0:3b00827bb0b7 65 #define SLIP_MAX_SIZE 1500
AdamGreen 0:3b00827bb0b7 66
AdamGreen 0:3b00827bb0b7 67 enum slipif_recv_state {
AdamGreen 0:3b00827bb0b7 68 SLIP_RECV_NORMAL,
AdamGreen 0:3b00827bb0b7 69 SLIP_RECV_ESCAPE,
AdamGreen 0:3b00827bb0b7 70 };
AdamGreen 0:3b00827bb0b7 71
AdamGreen 0:3b00827bb0b7 72 struct slipif_priv {
AdamGreen 0:3b00827bb0b7 73 sio_fd_t sd;
AdamGreen 0:3b00827bb0b7 74 /* q is the whole pbuf chain for a packet, p is the current pbuf in the chain */
AdamGreen 0:3b00827bb0b7 75 struct pbuf *p, *q;
AdamGreen 0:3b00827bb0b7 76 enum slipif_recv_state state;
AdamGreen 0:3b00827bb0b7 77 u16_t i, recved;
AdamGreen 0:3b00827bb0b7 78 };
AdamGreen 0:3b00827bb0b7 79
AdamGreen 0:3b00827bb0b7 80 /**
AdamGreen 0:3b00827bb0b7 81 * Send a pbuf doing the necessary SLIP encapsulation
AdamGreen 0:3b00827bb0b7 82 *
AdamGreen 0:3b00827bb0b7 83 * Uses the serial layer's sio_send()
AdamGreen 0:3b00827bb0b7 84 *
AdamGreen 0:3b00827bb0b7 85 * @param netif the lwip network interface structure for this slipif
AdamGreen 0:3b00827bb0b7 86 * @param p the pbuf chaing packet to send
AdamGreen 0:3b00827bb0b7 87 * @param ipaddr the ip address to send the packet to (not used for slipif)
AdamGreen 0:3b00827bb0b7 88 * @return always returns ERR_OK since the serial layer does not provide return values
AdamGreen 0:3b00827bb0b7 89 */
AdamGreen 0:3b00827bb0b7 90 err_t
AdamGreen 0:3b00827bb0b7 91 slipif_output(struct netif *netif, struct pbuf *p, ip_addr_t *ipaddr)
AdamGreen 0:3b00827bb0b7 92 {
AdamGreen 0:3b00827bb0b7 93 struct slipif_priv *priv;
AdamGreen 0:3b00827bb0b7 94 struct pbuf *q;
AdamGreen 0:3b00827bb0b7 95 u16_t i;
AdamGreen 0:3b00827bb0b7 96 u8_t c;
AdamGreen 0:3b00827bb0b7 97
AdamGreen 0:3b00827bb0b7 98 LWIP_ASSERT("netif != NULL", (netif != NULL));
AdamGreen 0:3b00827bb0b7 99 LWIP_ASSERT("netif->state != NULL", (netif->state != NULL));
AdamGreen 0:3b00827bb0b7 100 LWIP_ASSERT("p != NULL", (p != NULL));
AdamGreen 0:3b00827bb0b7 101
AdamGreen 0:3b00827bb0b7 102 LWIP_UNUSED_ARG(ipaddr);
AdamGreen 0:3b00827bb0b7 103
AdamGreen 0:3b00827bb0b7 104 priv = netif->state;
AdamGreen 0:3b00827bb0b7 105
AdamGreen 0:3b00827bb0b7 106 /* Send pbuf out on the serial I/O device. */
AdamGreen 0:3b00827bb0b7 107 sio_send(SLIP_END, priv->sd);
AdamGreen 0:3b00827bb0b7 108
AdamGreen 0:3b00827bb0b7 109 for (q = p; q != NULL; q = q->next) {
AdamGreen 0:3b00827bb0b7 110 for (i = 0; i < q->len; i++) {
AdamGreen 0:3b00827bb0b7 111 c = ((u8_t *)q->payload)[i];
AdamGreen 0:3b00827bb0b7 112 switch (c) {
AdamGreen 0:3b00827bb0b7 113 case SLIP_END:
AdamGreen 0:3b00827bb0b7 114 sio_send(SLIP_ESC, priv->sd);
AdamGreen 0:3b00827bb0b7 115 sio_send(SLIP_ESC_END, priv->sd);
AdamGreen 0:3b00827bb0b7 116 break;
AdamGreen 0:3b00827bb0b7 117 case SLIP_ESC:
AdamGreen 0:3b00827bb0b7 118 sio_send(SLIP_ESC, priv->sd);
AdamGreen 0:3b00827bb0b7 119 sio_send(SLIP_ESC_ESC, priv->sd);
AdamGreen 0:3b00827bb0b7 120 break;
AdamGreen 0:3b00827bb0b7 121 default:
AdamGreen 0:3b00827bb0b7 122 sio_send(c, priv->sd);
AdamGreen 0:3b00827bb0b7 123 break;
AdamGreen 0:3b00827bb0b7 124 }
AdamGreen 0:3b00827bb0b7 125 }
AdamGreen 0:3b00827bb0b7 126 }
AdamGreen 0:3b00827bb0b7 127 sio_send(SLIP_END, priv->sd);
AdamGreen 0:3b00827bb0b7 128 return ERR_OK;
AdamGreen 0:3b00827bb0b7 129 }
AdamGreen 0:3b00827bb0b7 130
AdamGreen 0:3b00827bb0b7 131 /**
AdamGreen 0:3b00827bb0b7 132 * Static function for easy use of blockig or non-blocking
AdamGreen 0:3b00827bb0b7 133 * sio_read
AdamGreen 0:3b00827bb0b7 134 *
AdamGreen 0:3b00827bb0b7 135 * @param fd serial device handle
AdamGreen 0:3b00827bb0b7 136 * @param data pointer to data buffer for receiving
AdamGreen 0:3b00827bb0b7 137 * @param len maximum length (in bytes) of data to receive
AdamGreen 0:3b00827bb0b7 138 * @param block if 1, call sio_read; if 0, call sio_tryread
AdamGreen 0:3b00827bb0b7 139 * @return return value of sio_read of sio_tryread
AdamGreen 0:3b00827bb0b7 140 */
AdamGreen 0:3b00827bb0b7 141 static u32_t
AdamGreen 0:3b00827bb0b7 142 slip_sio_read(sio_fd_t fd, u8_t* data, u32_t len, u8_t block)
AdamGreen 0:3b00827bb0b7 143 {
AdamGreen 0:3b00827bb0b7 144 if (block) {
AdamGreen 0:3b00827bb0b7 145 return sio_read(fd, data, len);
AdamGreen 0:3b00827bb0b7 146 } else {
AdamGreen 0:3b00827bb0b7 147 return sio_tryread(fd, data, len);
AdamGreen 0:3b00827bb0b7 148 }
AdamGreen 0:3b00827bb0b7 149 }
AdamGreen 0:3b00827bb0b7 150
AdamGreen 0:3b00827bb0b7 151 /**
AdamGreen 0:3b00827bb0b7 152 * Handle the incoming SLIP stream character by character
AdamGreen 0:3b00827bb0b7 153 *
AdamGreen 0:3b00827bb0b7 154 * Poll the serial layer by calling sio_read() or sio_tryread().
AdamGreen 0:3b00827bb0b7 155 *
AdamGreen 0:3b00827bb0b7 156 * @param netif the lwip network interface structure for this slipif
AdamGreen 0:3b00827bb0b7 157 * @param block if 1, block until data is received; if 0, return when all data
AdamGreen 0:3b00827bb0b7 158 * from the buffer is received (multiple calls to this function will
AdamGreen 0:3b00827bb0b7 159 * return a complete packet, NULL is returned before - used for polling)
AdamGreen 0:3b00827bb0b7 160 * @return The IP packet when SLIP_END is received
AdamGreen 0:3b00827bb0b7 161 */
AdamGreen 0:3b00827bb0b7 162 static struct pbuf *
AdamGreen 0:3b00827bb0b7 163 slipif_input(struct netif *netif, u8_t block)
AdamGreen 0:3b00827bb0b7 164 {
AdamGreen 0:3b00827bb0b7 165 struct slipif_priv *priv;
AdamGreen 0:3b00827bb0b7 166 u8_t c;
AdamGreen 0:3b00827bb0b7 167 struct pbuf *t;
AdamGreen 0:3b00827bb0b7 168
AdamGreen 0:3b00827bb0b7 169 LWIP_ASSERT("netif != NULL", (netif != NULL));
AdamGreen 0:3b00827bb0b7 170 LWIP_ASSERT("netif->state != NULL", (netif->state != NULL));
AdamGreen 0:3b00827bb0b7 171
AdamGreen 0:3b00827bb0b7 172 priv = netif->state;
AdamGreen 0:3b00827bb0b7 173
AdamGreen 0:3b00827bb0b7 174 while (slip_sio_read(priv->sd, &c, 1, block) > 0) {
AdamGreen 0:3b00827bb0b7 175 switch (priv->state) {
AdamGreen 0:3b00827bb0b7 176 case SLIP_RECV_NORMAL:
AdamGreen 0:3b00827bb0b7 177 switch (c) {
AdamGreen 0:3b00827bb0b7 178 case SLIP_END:
AdamGreen 0:3b00827bb0b7 179 if (priv->recved > 0) {
AdamGreen 0:3b00827bb0b7 180 /* Received whole packet. */
AdamGreen 0:3b00827bb0b7 181 /* Trim the pbuf to the size of the received packet. */
AdamGreen 0:3b00827bb0b7 182 pbuf_realloc(priv->q, priv->recved);
AdamGreen 0:3b00827bb0b7 183
AdamGreen 0:3b00827bb0b7 184 LINK_STATS_INC(link.recv);
AdamGreen 0:3b00827bb0b7 185
AdamGreen 0:3b00827bb0b7 186 LWIP_DEBUGF(SLIP_DEBUG, ("slipif: Got packet\n"));
AdamGreen 0:3b00827bb0b7 187 t = priv->q;
AdamGreen 0:3b00827bb0b7 188 priv->p = priv->q = NULL;
AdamGreen 0:3b00827bb0b7 189 priv->i = priv->recved = 0;
AdamGreen 0:3b00827bb0b7 190 return t;
AdamGreen 0:3b00827bb0b7 191 }
AdamGreen 0:3b00827bb0b7 192 continue;
AdamGreen 0:3b00827bb0b7 193 case SLIP_ESC:
AdamGreen 0:3b00827bb0b7 194 priv->state = SLIP_RECV_ESCAPE;
AdamGreen 0:3b00827bb0b7 195 continue;
AdamGreen 0:3b00827bb0b7 196 }
AdamGreen 0:3b00827bb0b7 197 break;
AdamGreen 0:3b00827bb0b7 198 case SLIP_RECV_ESCAPE:
AdamGreen 0:3b00827bb0b7 199 switch (c) {
AdamGreen 0:3b00827bb0b7 200 case SLIP_ESC_END:
AdamGreen 0:3b00827bb0b7 201 c = SLIP_END;
AdamGreen 0:3b00827bb0b7 202 break;
AdamGreen 0:3b00827bb0b7 203 case SLIP_ESC_ESC:
AdamGreen 0:3b00827bb0b7 204 c = SLIP_ESC;
AdamGreen 0:3b00827bb0b7 205 break;
AdamGreen 0:3b00827bb0b7 206 }
AdamGreen 0:3b00827bb0b7 207 priv->state = SLIP_RECV_NORMAL;
AdamGreen 0:3b00827bb0b7 208 /* FALLTHROUGH */
AdamGreen 0:3b00827bb0b7 209 }
AdamGreen 0:3b00827bb0b7 210
AdamGreen 0:3b00827bb0b7 211 /* byte received, packet not yet completely received */
AdamGreen 0:3b00827bb0b7 212 if (priv->p == NULL) {
AdamGreen 0:3b00827bb0b7 213 /* allocate a new pbuf */
AdamGreen 0:3b00827bb0b7 214 LWIP_DEBUGF(SLIP_DEBUG, ("slipif_input: alloc\n"));
AdamGreen 0:3b00827bb0b7 215 priv->p = pbuf_alloc(PBUF_LINK, (PBUF_POOL_BUFSIZE - PBUF_LINK_HLEN), PBUF_POOL);
AdamGreen 0:3b00827bb0b7 216
AdamGreen 0:3b00827bb0b7 217 if (priv->p == NULL) {
AdamGreen 0:3b00827bb0b7 218 LINK_STATS_INC(link.drop);
AdamGreen 0:3b00827bb0b7 219 LWIP_DEBUGF(SLIP_DEBUG, ("slipif_input: no new pbuf! (DROP)\n"));
AdamGreen 0:3b00827bb0b7 220 /* don't process any further since we got no pbuf to receive to */
AdamGreen 0:3b00827bb0b7 221 break;
AdamGreen 0:3b00827bb0b7 222 }
AdamGreen 0:3b00827bb0b7 223
AdamGreen 0:3b00827bb0b7 224 if (priv->q != NULL) {
AdamGreen 0:3b00827bb0b7 225 /* 'chain' the pbuf to the existing chain */
AdamGreen 0:3b00827bb0b7 226 pbuf_cat(priv->q, priv->p);
AdamGreen 0:3b00827bb0b7 227 } else {
AdamGreen 0:3b00827bb0b7 228 /* p is the first pbuf in the chain */
AdamGreen 0:3b00827bb0b7 229 priv->q = priv->p;
AdamGreen 0:3b00827bb0b7 230 }
AdamGreen 0:3b00827bb0b7 231 }
AdamGreen 0:3b00827bb0b7 232
AdamGreen 0:3b00827bb0b7 233 /* this automatically drops bytes if > SLIP_MAX_SIZE */
AdamGreen 0:3b00827bb0b7 234 if ((priv->p != NULL) && (priv->recved <= SLIP_MAX_SIZE)) {
AdamGreen 0:3b00827bb0b7 235 ((u8_t *)priv->p->payload)[priv->i] = c;
AdamGreen 0:3b00827bb0b7 236 priv->recved++;
AdamGreen 0:3b00827bb0b7 237 priv->i++;
AdamGreen 0:3b00827bb0b7 238 if (priv->i >= priv->p->len) {
AdamGreen 0:3b00827bb0b7 239 /* on to the next pbuf */
AdamGreen 0:3b00827bb0b7 240 priv->i = 0;
AdamGreen 0:3b00827bb0b7 241 if (priv->p->next != NULL && priv->p->next->len > 0) {
AdamGreen 0:3b00827bb0b7 242 /* p is a chain, on to the next in the chain */
AdamGreen 0:3b00827bb0b7 243 priv->p = priv->p->next;
AdamGreen 0:3b00827bb0b7 244 } else {
AdamGreen 0:3b00827bb0b7 245 /* p is a single pbuf, set it to NULL so next time a new
AdamGreen 0:3b00827bb0b7 246 * pbuf is allocated */
AdamGreen 0:3b00827bb0b7 247 priv->p = NULL;
AdamGreen 0:3b00827bb0b7 248 }
AdamGreen 0:3b00827bb0b7 249 }
AdamGreen 0:3b00827bb0b7 250 }
AdamGreen 0:3b00827bb0b7 251 }
AdamGreen 0:3b00827bb0b7 252
AdamGreen 0:3b00827bb0b7 253 return NULL;
AdamGreen 0:3b00827bb0b7 254 }
AdamGreen 0:3b00827bb0b7 255
AdamGreen 0:3b00827bb0b7 256 #if !NO_SYS
AdamGreen 0:3b00827bb0b7 257 /**
AdamGreen 0:3b00827bb0b7 258 * The SLIP input thread.
AdamGreen 0:3b00827bb0b7 259 *
AdamGreen 0:3b00827bb0b7 260 * Feed the IP layer with incoming packets
AdamGreen 0:3b00827bb0b7 261 *
AdamGreen 0:3b00827bb0b7 262 * @param nf the lwip network interface structure for this slipif
AdamGreen 0:3b00827bb0b7 263 */
AdamGreen 0:3b00827bb0b7 264 static void
AdamGreen 0:3b00827bb0b7 265 slipif_loop_thread(void *nf)
AdamGreen 0:3b00827bb0b7 266 {
AdamGreen 0:3b00827bb0b7 267 struct pbuf *p;
AdamGreen 0:3b00827bb0b7 268 struct netif *netif = (struct netif *)nf;
AdamGreen 0:3b00827bb0b7 269
AdamGreen 0:3b00827bb0b7 270 while (1) {
AdamGreen 0:3b00827bb0b7 271 p = slipif_input(netif, SLIP_BLOCK);
AdamGreen 0:3b00827bb0b7 272 if (p != NULL) {
AdamGreen 0:3b00827bb0b7 273 if (netif->input(p, netif) != ERR_OK) {
AdamGreen 0:3b00827bb0b7 274 pbuf_free(p);
AdamGreen 0:3b00827bb0b7 275 p = NULL;
AdamGreen 0:3b00827bb0b7 276 }
AdamGreen 0:3b00827bb0b7 277 }
AdamGreen 0:3b00827bb0b7 278 }
AdamGreen 0:3b00827bb0b7 279 }
AdamGreen 0:3b00827bb0b7 280 #endif /* !NO_SYS */
AdamGreen 0:3b00827bb0b7 281
AdamGreen 0:3b00827bb0b7 282 /**
AdamGreen 0:3b00827bb0b7 283 * SLIP netif initialization
AdamGreen 0:3b00827bb0b7 284 *
AdamGreen 0:3b00827bb0b7 285 * Call the arch specific sio_open and remember
AdamGreen 0:3b00827bb0b7 286 * the opened device in the state field of the netif.
AdamGreen 0:3b00827bb0b7 287 *
AdamGreen 0:3b00827bb0b7 288 * @param netif the lwip network interface structure for this slipif
AdamGreen 0:3b00827bb0b7 289 * @return ERR_OK if serial line could be opened,
AdamGreen 0:3b00827bb0b7 290 * ERR_MEM if no memory could be allocated,
AdamGreen 0:3b00827bb0b7 291 * ERR_IF is serial line couldn't be opened
AdamGreen 0:3b00827bb0b7 292 *
AdamGreen 0:3b00827bb0b7 293 * @note netif->num must contain the number of the serial port to open
AdamGreen 0:3b00827bb0b7 294 * (0 by default)
AdamGreen 0:3b00827bb0b7 295 */
AdamGreen 0:3b00827bb0b7 296 err_t
AdamGreen 0:3b00827bb0b7 297 slipif_init(struct netif *netif)
AdamGreen 0:3b00827bb0b7 298 {
AdamGreen 0:3b00827bb0b7 299 struct slipif_priv *priv;
AdamGreen 0:3b00827bb0b7 300
AdamGreen 0:3b00827bb0b7 301 LWIP_DEBUGF(SLIP_DEBUG, ("slipif_init: netif->num=%"U16_F"\n", (u16_t)netif->num));
AdamGreen 0:3b00827bb0b7 302
AdamGreen 0:3b00827bb0b7 303 /* Allocate private data */
AdamGreen 0:3b00827bb0b7 304 priv = mem_malloc(sizeof(struct slipif_priv));
AdamGreen 0:3b00827bb0b7 305 if (!priv) {
AdamGreen 0:3b00827bb0b7 306 return ERR_MEM;
AdamGreen 0:3b00827bb0b7 307 }
AdamGreen 0:3b00827bb0b7 308
AdamGreen 0:3b00827bb0b7 309 netif->name[0] = 's';
AdamGreen 0:3b00827bb0b7 310 netif->name[1] = 'l';
AdamGreen 0:3b00827bb0b7 311 netif->output = slipif_output;
AdamGreen 0:3b00827bb0b7 312 netif->mtu = SLIP_MAX_SIZE;
AdamGreen 0:3b00827bb0b7 313 netif->flags |= NETIF_FLAG_POINTTOPOINT;
AdamGreen 0:3b00827bb0b7 314
AdamGreen 0:3b00827bb0b7 315 /* Try to open the serial port (netif->num contains the port number). */
AdamGreen 0:3b00827bb0b7 316 priv->sd = sio_open(netif->num);
AdamGreen 0:3b00827bb0b7 317 if (!priv->sd) {
AdamGreen 0:3b00827bb0b7 318 /* Opening the serial port failed. */
AdamGreen 0:3b00827bb0b7 319 mem_free(priv);
AdamGreen 0:3b00827bb0b7 320 return ERR_IF;
AdamGreen 0:3b00827bb0b7 321 }
AdamGreen 0:3b00827bb0b7 322
AdamGreen 0:3b00827bb0b7 323 /* Initialize private data */
AdamGreen 0:3b00827bb0b7 324 priv->p = NULL;
AdamGreen 0:3b00827bb0b7 325 priv->q = NULL;
AdamGreen 0:3b00827bb0b7 326 priv->state = SLIP_RECV_NORMAL;
AdamGreen 0:3b00827bb0b7 327 priv->i = 0;
AdamGreen 0:3b00827bb0b7 328 priv->recved = 0;
AdamGreen 0:3b00827bb0b7 329
AdamGreen 0:3b00827bb0b7 330 netif->state = priv;
AdamGreen 0:3b00827bb0b7 331
AdamGreen 0:3b00827bb0b7 332 /* initialize the snmp variables and counters inside the struct netif
AdamGreen 0:3b00827bb0b7 333 * ifSpeed: no assumption can be made without knowing more about the
AdamGreen 0:3b00827bb0b7 334 * serial line!
AdamGreen 0:3b00827bb0b7 335 */
AdamGreen 0:3b00827bb0b7 336 NETIF_INIT_SNMP(netif, snmp_ifType_slip, 0);
AdamGreen 0:3b00827bb0b7 337
AdamGreen 0:3b00827bb0b7 338 /* Create a thread to poll the serial line. */
AdamGreen 0:3b00827bb0b7 339 sys_thread_new(SLIPIF_THREAD_NAME, slipif_loop_thread, netif,
AdamGreen 0:3b00827bb0b7 340 SLIPIF_THREAD_STACKSIZE, SLIPIF_THREAD_PRIO);
AdamGreen 0:3b00827bb0b7 341 return ERR_OK;
AdamGreen 0:3b00827bb0b7 342 }
AdamGreen 0:3b00827bb0b7 343
AdamGreen 0:3b00827bb0b7 344 /**
AdamGreen 0:3b00827bb0b7 345 * Polls the serial device and feeds the IP layer with incoming packets.
AdamGreen 0:3b00827bb0b7 346 *
AdamGreen 0:3b00827bb0b7 347 * @param netif The lwip network interface structure for this slipif
AdamGreen 0:3b00827bb0b7 348 */
AdamGreen 0:3b00827bb0b7 349 void
AdamGreen 0:3b00827bb0b7 350 slipif_poll(struct netif *netif)
AdamGreen 0:3b00827bb0b7 351 {
AdamGreen 0:3b00827bb0b7 352 struct pbuf *p;
AdamGreen 0:3b00827bb0b7 353 struct slipif_priv *priv;
AdamGreen 0:3b00827bb0b7 354
AdamGreen 0:3b00827bb0b7 355 LWIP_ASSERT("netif != NULL", (netif != NULL));
AdamGreen 0:3b00827bb0b7 356 LWIP_ASSERT("netif->state != NULL", (netif->state != NULL));
AdamGreen 0:3b00827bb0b7 357
AdamGreen 0:3b00827bb0b7 358 priv = netif->state;
AdamGreen 0:3b00827bb0b7 359
AdamGreen 0:3b00827bb0b7 360 while ((p = slipif_input(netif, SLIP_DONTBLOCK)) != NULL) {
AdamGreen 0:3b00827bb0b7 361 if (netif->input(p, netif) != ERR_OK) {
AdamGreen 0:3b00827bb0b7 362 pbuf_free(p);
AdamGreen 0:3b00827bb0b7 363 }
AdamGreen 0:3b00827bb0b7 364 }
AdamGreen 0:3b00827bb0b7 365 }
AdamGreen 0:3b00827bb0b7 366
AdamGreen 0:3b00827bb0b7 367 #endif /* LWIP_HAVE_SLIPIF */