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NetServices/lwip/netif/slipif.c@0:4edb816d21e1, 2015-10-16 (annotated)

Committer:
ICTFBI
Date:
Fri Oct 16 14:28:26 2015 +0000
Revision:
0:4edb816d21e1
Pre-update 16-10-15

Who changed what in which revision?

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ICTFBI 0:4edb816d21e1 1 /**
ICTFBI 0:4edb816d21e1 2 * @file
ICTFBI 0:4edb816d21e1 3 * SLIP Interface
ICTFBI 0:4edb816d21e1 4 *
ICTFBI 0:4edb816d21e1 5 */
ICTFBI 0:4edb816d21e1 6
ICTFBI 0:4edb816d21e1 7 /*
ICTFBI 0:4edb816d21e1 8 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
ICTFBI 0:4edb816d21e1 9 * All rights reserved.
ICTFBI 0:4edb816d21e1 10 *
ICTFBI 0:4edb816d21e1 11 * Redistribution and use in source and binary forms, with or without
ICTFBI 0:4edb816d21e1 12 * modification, are permitted provided that the following conditions
ICTFBI 0:4edb816d21e1 13 * are met:
ICTFBI 0:4edb816d21e1 14 * 1. Redistributions of source code must retain the above copyright
ICTFBI 0:4edb816d21e1 15 * notice, this list of conditions and the following disclaimer.
ICTFBI 0:4edb816d21e1 16 * 2. Redistributions in binary form must reproduce the above copyright
ICTFBI 0:4edb816d21e1 17 * notice, this list of conditions and the following disclaimer in the
ICTFBI 0:4edb816d21e1 18 * documentation and/or other materials provided with the distribution.
ICTFBI 0:4edb816d21e1 19 * 3. Neither the name of the Institute nor the names of its contributors
ICTFBI 0:4edb816d21e1 20 * may be used to endorse or promote products derived from this software
ICTFBI 0:4edb816d21e1 21 * without specific prior written permission.
ICTFBI 0:4edb816d21e1 22 *
ICTFBI 0:4edb816d21e1 23 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
ICTFBI 0:4edb816d21e1 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
ICTFBI 0:4edb816d21e1 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ICTFBI 0:4edb816d21e1 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
ICTFBI 0:4edb816d21e1 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
ICTFBI 0:4edb816d21e1 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
ICTFBI 0:4edb816d21e1 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
ICTFBI 0:4edb816d21e1 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
ICTFBI 0:4edb816d21e1 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
ICTFBI 0:4edb816d21e1 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
ICTFBI 0:4edb816d21e1 33 * SUCH DAMAGE.
ICTFBI 0:4edb816d21e1 34 *
ICTFBI 0:4edb816d21e1 35 * This file is built upon the file: src/arch/rtxc/netif/sioslip.c
ICTFBI 0:4edb816d21e1 36 *
ICTFBI 0:4edb816d21e1 37 * Author: Magnus Ivarsson <magnus.ivarsson(at)volvo.com>
ICTFBI 0:4edb816d21e1 38 */
ICTFBI 0:4edb816d21e1 39
ICTFBI 0:4edb816d21e1 40 /*
ICTFBI 0:4edb816d21e1 41 * This is an arch independent SLIP netif. The specific serial hooks must be
ICTFBI 0:4edb816d21e1 42 * provided by another file. They are sio_open, sio_read/sio_tryread and sio_send
ICTFBI 0:4edb816d21e1 43 */
ICTFBI 0:4edb816d21e1 44
ICTFBI 0:4edb816d21e1 45 #include "netif/slipif.h"
ICTFBI 0:4edb816d21e1 46 #include "lwip/opt.h"
ICTFBI 0:4edb816d21e1 47
ICTFBI 0:4edb816d21e1 48 #if LWIP_HAVE_SLIPIF
ICTFBI 0:4edb816d21e1 49
ICTFBI 0:4edb816d21e1 50 #include "lwip/def.h"
ICTFBI 0:4edb816d21e1 51 #include "lwip/pbuf.h"
ICTFBI 0:4edb816d21e1 52 #include "lwip/sys.h"
ICTFBI 0:4edb816d21e1 53 #include "lwip/stats.h"
ICTFBI 0:4edb816d21e1 54 #include "lwip/snmp.h"
ICTFBI 0:4edb816d21e1 55 #include "lwip/sio.h"
ICTFBI 0:4edb816d21e1 56
ICTFBI 0:4edb816d21e1 57 #define SLIP_BLOCK 1
ICTFBI 0:4edb816d21e1 58 #define SLIP_DONTBLOCK 0
ICTFBI 0:4edb816d21e1 59
ICTFBI 0:4edb816d21e1 60 #define SLIP_END 0300 /* 0xC0 */
ICTFBI 0:4edb816d21e1 61 #define SLIP_ESC 0333 /* 0xDB */
ICTFBI 0:4edb816d21e1 62 #define SLIP_ESC_END 0334 /* 0xDC */
ICTFBI 0:4edb816d21e1 63 #define SLIP_ESC_ESC 0335 /* 0xDD */
ICTFBI 0:4edb816d21e1 64
ICTFBI 0:4edb816d21e1 65 #define SLIP_MAX_SIZE 1500
ICTFBI 0:4edb816d21e1 66
ICTFBI 0:4edb816d21e1 67 enum slipif_recv_state {
ICTFBI 0:4edb816d21e1 68 SLIP_RECV_NORMAL,
ICTFBI 0:4edb816d21e1 69 SLIP_RECV_ESCAPE,
ICTFBI 0:4edb816d21e1 70 };
ICTFBI 0:4edb816d21e1 71
ICTFBI 0:4edb816d21e1 72 struct slipif_priv {
ICTFBI 0:4edb816d21e1 73 sio_fd_t sd;
ICTFBI 0:4edb816d21e1 74 /* q is the whole pbuf chain for a packet, p is the current pbuf in the chain */
ICTFBI 0:4edb816d21e1 75 struct pbuf *p, *q;
ICTFBI 0:4edb816d21e1 76 enum slipif_recv_state state;
ICTFBI 0:4edb816d21e1 77 u16_t i, recved;
ICTFBI 0:4edb816d21e1 78 };
ICTFBI 0:4edb816d21e1 79
ICTFBI 0:4edb816d21e1 80 /**
ICTFBI 0:4edb816d21e1 81 * Send a pbuf doing the necessary SLIP encapsulation
ICTFBI 0:4edb816d21e1 82 *
ICTFBI 0:4edb816d21e1 83 * Uses the serial layer's sio_send()
ICTFBI 0:4edb816d21e1 84 *
ICTFBI 0:4edb816d21e1 85 * @param netif the lwip network interface structure for this slipif
ICTFBI 0:4edb816d21e1 86 * @param p the pbuf chaing packet to send
ICTFBI 0:4edb816d21e1 87 * @param ipaddr the ip address to send the packet to (not used for slipif)
ICTFBI 0:4edb816d21e1 88 * @return always returns ERR_OK since the serial layer does not provide return values
ICTFBI 0:4edb816d21e1 89 */
ICTFBI 0:4edb816d21e1 90 err_t
ICTFBI 0:4edb816d21e1 91 slipif_output(struct netif *netif, struct pbuf *p, ip_addr_t *ipaddr)
ICTFBI 0:4edb816d21e1 92 {
ICTFBI 0:4edb816d21e1 93 struct slipif_priv *priv;
ICTFBI 0:4edb816d21e1 94 struct pbuf *q;
ICTFBI 0:4edb816d21e1 95 u16_t i;
ICTFBI 0:4edb816d21e1 96 u8_t c;
ICTFBI 0:4edb816d21e1 97
ICTFBI 0:4edb816d21e1 98 LWIP_ASSERT("netif != NULL", (netif != NULL));
ICTFBI 0:4edb816d21e1 99 LWIP_ASSERT("netif->state != NULL", (netif->state != NULL));
ICTFBI 0:4edb816d21e1 100 LWIP_ASSERT("p != NULL", (p != NULL));
ICTFBI 0:4edb816d21e1 101
ICTFBI 0:4edb816d21e1 102 LWIP_UNUSED_ARG(ipaddr);
ICTFBI 0:4edb816d21e1 103
ICTFBI 0:4edb816d21e1 104 priv = netif->state;
ICTFBI 0:4edb816d21e1 105
ICTFBI 0:4edb816d21e1 106 /* Send pbuf out on the serial I/O device. */
ICTFBI 0:4edb816d21e1 107 sio_send(SLIP_END, priv->sd);
ICTFBI 0:4edb816d21e1 108
ICTFBI 0:4edb816d21e1 109 for (q = p; q != NULL; q = q->next) {
ICTFBI 0:4edb816d21e1 110 for (i = 0; i < q->len; i++) {
ICTFBI 0:4edb816d21e1 111 c = ((u8_t *)q->payload)[i];
ICTFBI 0:4edb816d21e1 112 switch (c) {
ICTFBI 0:4edb816d21e1 113 case SLIP_END:
ICTFBI 0:4edb816d21e1 114 sio_send(SLIP_ESC, priv->sd);
ICTFBI 0:4edb816d21e1 115 sio_send(SLIP_ESC_END, priv->sd);
ICTFBI 0:4edb816d21e1 116 break;
ICTFBI 0:4edb816d21e1 117 case SLIP_ESC:
ICTFBI 0:4edb816d21e1 118 sio_send(SLIP_ESC, priv->sd);
ICTFBI 0:4edb816d21e1 119 sio_send(SLIP_ESC_ESC, priv->sd);
ICTFBI 0:4edb816d21e1 120 break;
ICTFBI 0:4edb816d21e1 121 default:
ICTFBI 0:4edb816d21e1 122 sio_send(c, priv->sd);
ICTFBI 0:4edb816d21e1 123 break;
ICTFBI 0:4edb816d21e1 124 }
ICTFBI 0:4edb816d21e1 125 }
ICTFBI 0:4edb816d21e1 126 }
ICTFBI 0:4edb816d21e1 127 sio_send(SLIP_END, priv->sd);
ICTFBI 0:4edb816d21e1 128 return ERR_OK;
ICTFBI 0:4edb816d21e1 129 }
ICTFBI 0:4edb816d21e1 130
ICTFBI 0:4edb816d21e1 131 /**
ICTFBI 0:4edb816d21e1 132 * Static function for easy use of blockig or non-blocking
ICTFBI 0:4edb816d21e1 133 * sio_read
ICTFBI 0:4edb816d21e1 134 *
ICTFBI 0:4edb816d21e1 135 * @param fd serial device handle
ICTFBI 0:4edb816d21e1 136 * @param data pointer to data buffer for receiving
ICTFBI 0:4edb816d21e1 137 * @param len maximum length (in bytes) of data to receive
ICTFBI 0:4edb816d21e1 138 * @param block if 1, call sio_read; if 0, call sio_tryread
ICTFBI 0:4edb816d21e1 139 * @return return value of sio_read of sio_tryread
ICTFBI 0:4edb816d21e1 140 */
ICTFBI 0:4edb816d21e1 141 static u32_t
ICTFBI 0:4edb816d21e1 142 slip_sio_read(sio_fd_t fd, u8_t* data, u32_t len, u8_t block)
ICTFBI 0:4edb816d21e1 143 {
ICTFBI 0:4edb816d21e1 144 if (block) {
ICTFBI 0:4edb816d21e1 145 return sio_read(fd, data, len);
ICTFBI 0:4edb816d21e1 146 } else {
ICTFBI 0:4edb816d21e1 147 return sio_tryread(fd, data, len);
ICTFBI 0:4edb816d21e1 148 }
ICTFBI 0:4edb816d21e1 149 }
ICTFBI 0:4edb816d21e1 150
ICTFBI 0:4edb816d21e1 151 /**
ICTFBI 0:4edb816d21e1 152 * Handle the incoming SLIP stream character by character
ICTFBI 0:4edb816d21e1 153 *
ICTFBI 0:4edb816d21e1 154 * Poll the serial layer by calling sio_read() or sio_tryread().
ICTFBI 0:4edb816d21e1 155 *
ICTFBI 0:4edb816d21e1 156 * @param netif the lwip network interface structure for this slipif
ICTFBI 0:4edb816d21e1 157 * @param block if 1, block until data is received; if 0, return when all data
ICTFBI 0:4edb816d21e1 158 * from the buffer is received (multiple calls to this function will
ICTFBI 0:4edb816d21e1 159 * return a complete packet, NULL is returned before - used for polling)
ICTFBI 0:4edb816d21e1 160 * @return The IP packet when SLIP_END is received
ICTFBI 0:4edb816d21e1 161 */
ICTFBI 0:4edb816d21e1 162 static struct pbuf *
ICTFBI 0:4edb816d21e1 163 slipif_input(struct netif *netif, u8_t block)
ICTFBI 0:4edb816d21e1 164 {
ICTFBI 0:4edb816d21e1 165 struct slipif_priv *priv;
ICTFBI 0:4edb816d21e1 166 u8_t c;
ICTFBI 0:4edb816d21e1 167 struct pbuf *t;
ICTFBI 0:4edb816d21e1 168
ICTFBI 0:4edb816d21e1 169 LWIP_ASSERT("netif != NULL", (netif != NULL));
ICTFBI 0:4edb816d21e1 170 LWIP_ASSERT("netif->state != NULL", (netif->state != NULL));
ICTFBI 0:4edb816d21e1 171
ICTFBI 0:4edb816d21e1 172 priv = netif->state;
ICTFBI 0:4edb816d21e1 173
ICTFBI 0:4edb816d21e1 174 while (slip_sio_read(priv->sd, &c, 1, block) > 0) {
ICTFBI 0:4edb816d21e1 175 switch (priv->state) {
ICTFBI 0:4edb816d21e1 176 case SLIP_RECV_NORMAL:
ICTFBI 0:4edb816d21e1 177 switch (c) {
ICTFBI 0:4edb816d21e1 178 case SLIP_END:
ICTFBI 0:4edb816d21e1 179 if (priv->recved > 0) {
ICTFBI 0:4edb816d21e1 180 /* Received whole packet. */
ICTFBI 0:4edb816d21e1 181 /* Trim the pbuf to the size of the received packet. */
ICTFBI 0:4edb816d21e1 182 pbuf_realloc(priv->q, priv->recved);
ICTFBI 0:4edb816d21e1 183
ICTFBI 0:4edb816d21e1 184 LINK_STATS_INC(link.recv);
ICTFBI 0:4edb816d21e1 185
ICTFBI 0:4edb816d21e1 186 LWIP_DEBUGF(SLIP_DEBUG, ("slipif: Got packet\n"));
ICTFBI 0:4edb816d21e1 187 t = priv->q;
ICTFBI 0:4edb816d21e1 188 priv->p = priv->q = NULL;
ICTFBI 0:4edb816d21e1 189 priv->i = priv->recved = 0;
ICTFBI 0:4edb816d21e1 190 return t;
ICTFBI 0:4edb816d21e1 191 }
ICTFBI 0:4edb816d21e1 192 continue;
ICTFBI 0:4edb816d21e1 193 case SLIP_ESC:
ICTFBI 0:4edb816d21e1 194 priv->state = SLIP_RECV_ESCAPE;
ICTFBI 0:4edb816d21e1 195 continue;
ICTFBI 0:4edb816d21e1 196 }
ICTFBI 0:4edb816d21e1 197 break;
ICTFBI 0:4edb816d21e1 198 case SLIP_RECV_ESCAPE:
ICTFBI 0:4edb816d21e1 199 switch (c) {
ICTFBI 0:4edb816d21e1 200 case SLIP_ESC_END:
ICTFBI 0:4edb816d21e1 201 c = SLIP_END;
ICTFBI 0:4edb816d21e1 202 break;
ICTFBI 0:4edb816d21e1 203 case SLIP_ESC_ESC:
ICTFBI 0:4edb816d21e1 204 c = SLIP_ESC;
ICTFBI 0:4edb816d21e1 205 break;
ICTFBI 0:4edb816d21e1 206 }
ICTFBI 0:4edb816d21e1 207 priv->state = SLIP_RECV_NORMAL;
ICTFBI 0:4edb816d21e1 208 /* FALLTHROUGH */
ICTFBI 0:4edb816d21e1 209 }
ICTFBI 0:4edb816d21e1 210
ICTFBI 0:4edb816d21e1 211 /* byte received, packet not yet completely received */
ICTFBI 0:4edb816d21e1 212 if (priv->p == NULL) {
ICTFBI 0:4edb816d21e1 213 /* allocate a new pbuf */
ICTFBI 0:4edb816d21e1 214 LWIP_DEBUGF(SLIP_DEBUG, ("slipif_input: alloc\n"));
ICTFBI 0:4edb816d21e1 215 priv->p = pbuf_alloc(PBUF_LINK, (PBUF_POOL_BUFSIZE - PBUF_LINK_HLEN), PBUF_POOL);
ICTFBI 0:4edb816d21e1 216
ICTFBI 0:4edb816d21e1 217 if (priv->p == NULL) {
ICTFBI 0:4edb816d21e1 218 LINK_STATS_INC(link.drop);
ICTFBI 0:4edb816d21e1 219 LWIP_DEBUGF(SLIP_DEBUG, ("slipif_input: no new pbuf! (DROP)\n"));
ICTFBI 0:4edb816d21e1 220 /* don't process any further since we got no pbuf to receive to */
ICTFBI 0:4edb816d21e1 221 break;
ICTFBI 0:4edb816d21e1 222 }
ICTFBI 0:4edb816d21e1 223
ICTFBI 0:4edb816d21e1 224 if (priv->q != NULL) {
ICTFBI 0:4edb816d21e1 225 /* 'chain' the pbuf to the existing chain */
ICTFBI 0:4edb816d21e1 226 pbuf_cat(priv->q, priv->p);
ICTFBI 0:4edb816d21e1 227 } else {
ICTFBI 0:4edb816d21e1 228 /* p is the first pbuf in the chain */
ICTFBI 0:4edb816d21e1 229 priv->q = priv->p;
ICTFBI 0:4edb816d21e1 230 }
ICTFBI 0:4edb816d21e1 231 }
ICTFBI 0:4edb816d21e1 232
ICTFBI 0:4edb816d21e1 233 /* this automatically drops bytes if > SLIP_MAX_SIZE */
ICTFBI 0:4edb816d21e1 234 if ((priv->p != NULL) && (priv->recved <= SLIP_MAX_SIZE)) {
ICTFBI 0:4edb816d21e1 235 ((u8_t *)priv->p->payload)[priv->i] = c;
ICTFBI 0:4edb816d21e1 236 priv->recved++;
ICTFBI 0:4edb816d21e1 237 priv->i++;
ICTFBI 0:4edb816d21e1 238 if (priv->i >= priv->p->len) {
ICTFBI 0:4edb816d21e1 239 /* on to the next pbuf */
ICTFBI 0:4edb816d21e1 240 priv->i = 0;
ICTFBI 0:4edb816d21e1 241 if (priv->p->next != NULL && priv->p->next->len > 0) {
ICTFBI 0:4edb816d21e1 242 /* p is a chain, on to the next in the chain */
ICTFBI 0:4edb816d21e1 243 priv->p = priv->p->next;
ICTFBI 0:4edb816d21e1 244 } else {
ICTFBI 0:4edb816d21e1 245 /* p is a single pbuf, set it to NULL so next time a new
ICTFBI 0:4edb816d21e1 246 * pbuf is allocated */
ICTFBI 0:4edb816d21e1 247 priv->p = NULL;
ICTFBI 0:4edb816d21e1 248 }
ICTFBI 0:4edb816d21e1 249 }
ICTFBI 0:4edb816d21e1 250 }
ICTFBI 0:4edb816d21e1 251 }
ICTFBI 0:4edb816d21e1 252
ICTFBI 0:4edb816d21e1 253 return NULL;
ICTFBI 0:4edb816d21e1 254 }
ICTFBI 0:4edb816d21e1 255
ICTFBI 0:4edb816d21e1 256 #if !NO_SYS
ICTFBI 0:4edb816d21e1 257 /**
ICTFBI 0:4edb816d21e1 258 * The SLIP input thread.
ICTFBI 0:4edb816d21e1 259 *
ICTFBI 0:4edb816d21e1 260 * Feed the IP layer with incoming packets
ICTFBI 0:4edb816d21e1 261 *
ICTFBI 0:4edb816d21e1 262 * @param nf the lwip network interface structure for this slipif
ICTFBI 0:4edb816d21e1 263 */
ICTFBI 0:4edb816d21e1 264 static void
ICTFBI 0:4edb816d21e1 265 slipif_loop_thread(void *nf)
ICTFBI 0:4edb816d21e1 266 {
ICTFBI 0:4edb816d21e1 267 struct pbuf *p;
ICTFBI 0:4edb816d21e1 268 struct netif *netif = (struct netif *)nf;
ICTFBI 0:4edb816d21e1 269
ICTFBI 0:4edb816d21e1 270 while (1) {
ICTFBI 0:4edb816d21e1 271 p = slipif_input(netif, SLIP_BLOCK);
ICTFBI 0:4edb816d21e1 272 if (p != NULL) {
ICTFBI 0:4edb816d21e1 273 if (netif->input(p, netif) != ERR_OK) {
ICTFBI 0:4edb816d21e1 274 pbuf_free(p);
ICTFBI 0:4edb816d21e1 275 p = NULL;
ICTFBI 0:4edb816d21e1 276 }
ICTFBI 0:4edb816d21e1 277 }
ICTFBI 0:4edb816d21e1 278 }
ICTFBI 0:4edb816d21e1 279 }
ICTFBI 0:4edb816d21e1 280 #endif /* !NO_SYS */
ICTFBI 0:4edb816d21e1 281
ICTFBI 0:4edb816d21e1 282 /**
ICTFBI 0:4edb816d21e1 283 * SLIP netif initialization
ICTFBI 0:4edb816d21e1 284 *
ICTFBI 0:4edb816d21e1 285 * Call the arch specific sio_open and remember
ICTFBI 0:4edb816d21e1 286 * the opened device in the state field of the netif.
ICTFBI 0:4edb816d21e1 287 *
ICTFBI 0:4edb816d21e1 288 * @param netif the lwip network interface structure for this slipif
ICTFBI 0:4edb816d21e1 289 * @return ERR_OK if serial line could be opened,
ICTFBI 0:4edb816d21e1 290 * ERR_MEM if no memory could be allocated,
ICTFBI 0:4edb816d21e1 291 * ERR_IF is serial line couldn't be opened
ICTFBI 0:4edb816d21e1 292 *
ICTFBI 0:4edb816d21e1 293 * @note netif->num must contain the number of the serial port to open
ICTFBI 0:4edb816d21e1 294 * (0 by default)
ICTFBI 0:4edb816d21e1 295 */
ICTFBI 0:4edb816d21e1 296 err_t
ICTFBI 0:4edb816d21e1 297 slipif_init(struct netif *netif)
ICTFBI 0:4edb816d21e1 298 {
ICTFBI 0:4edb816d21e1 299 struct slipif_priv *priv;
ICTFBI 0:4edb816d21e1 300
ICTFBI 0:4edb816d21e1 301 LWIP_DEBUGF(SLIP_DEBUG, ("slipif_init: netif->num=%"U16_F"\n", (u16_t)netif->num));
ICTFBI 0:4edb816d21e1 302
ICTFBI 0:4edb816d21e1 303 /* Allocate private data */
ICTFBI 0:4edb816d21e1 304 priv = mem_malloc(sizeof(struct slipif_priv));
ICTFBI 0:4edb816d21e1 305 if (!priv) {
ICTFBI 0:4edb816d21e1 306 return ERR_MEM;
ICTFBI 0:4edb816d21e1 307 }
ICTFBI 0:4edb816d21e1 308
ICTFBI 0:4edb816d21e1 309 netif->name[0] = 's';
ICTFBI 0:4edb816d21e1 310 netif->name[1] = 'l';
ICTFBI 0:4edb816d21e1 311 netif->output = slipif_output;
ICTFBI 0:4edb816d21e1 312 netif->mtu = SLIP_MAX_SIZE;
ICTFBI 0:4edb816d21e1 313 netif->flags |= NETIF_FLAG_POINTTOPOINT;
ICTFBI 0:4edb816d21e1 314
ICTFBI 0:4edb816d21e1 315 /* Try to open the serial port (netif->num contains the port number). */
ICTFBI 0:4edb816d21e1 316 priv->sd = sio_open(netif->num);
ICTFBI 0:4edb816d21e1 317 if (!priv->sd) {
ICTFBI 0:4edb816d21e1 318 /* Opening the serial port failed. */
ICTFBI 0:4edb816d21e1 319 mem_free(priv);
ICTFBI 0:4edb816d21e1 320 return ERR_IF;
ICTFBI 0:4edb816d21e1 321 }
ICTFBI 0:4edb816d21e1 322
ICTFBI 0:4edb816d21e1 323 /* Initialize private data */
ICTFBI 0:4edb816d21e1 324 priv->p = NULL;
ICTFBI 0:4edb816d21e1 325 priv->q = NULL;
ICTFBI 0:4edb816d21e1 326 priv->state = SLIP_RECV_NORMAL;
ICTFBI 0:4edb816d21e1 327 priv->i = 0;
ICTFBI 0:4edb816d21e1 328 priv->recved = 0;
ICTFBI 0:4edb816d21e1 329
ICTFBI 0:4edb816d21e1 330 netif->state = priv;
ICTFBI 0:4edb816d21e1 331
ICTFBI 0:4edb816d21e1 332 /* initialize the snmp variables and counters inside the struct netif
ICTFBI 0:4edb816d21e1 333 * ifSpeed: no assumption can be made without knowing more about the
ICTFBI 0:4edb816d21e1 334 * serial line!
ICTFBI 0:4edb816d21e1 335 */
ICTFBI 0:4edb816d21e1 336 NETIF_INIT_SNMP(netif, snmp_ifType_slip, 0);
ICTFBI 0:4edb816d21e1 337
ICTFBI 0:4edb816d21e1 338 /* Create a thread to poll the serial line. */
ICTFBI 0:4edb816d21e1 339 sys_thread_new(SLIPIF_THREAD_NAME, slipif_loop_thread, netif,
ICTFBI 0:4edb816d21e1 340 SLIPIF_THREAD_STACKSIZE, SLIPIF_THREAD_PRIO);
ICTFBI 0:4edb816d21e1 341 return ERR_OK;
ICTFBI 0:4edb816d21e1 342 }
ICTFBI 0:4edb816d21e1 343
ICTFBI 0:4edb816d21e1 344 /**
ICTFBI 0:4edb816d21e1 345 * Polls the serial device and feeds the IP layer with incoming packets.
ICTFBI 0:4edb816d21e1 346 *
ICTFBI 0:4edb816d21e1 347 * @param netif The lwip network interface structure for this slipif
ICTFBI 0:4edb816d21e1 348 */
ICTFBI 0:4edb816d21e1 349 void
ICTFBI 0:4edb816d21e1 350 slipif_poll(struct netif *netif)
ICTFBI 0:4edb816d21e1 351 {
ICTFBI 0:4edb816d21e1 352 struct pbuf *p;
ICTFBI 0:4edb816d21e1 353 struct slipif_priv *priv;
ICTFBI 0:4edb816d21e1 354
ICTFBI 0:4edb816d21e1 355 LWIP_ASSERT("netif != NULL", (netif != NULL));
ICTFBI 0:4edb816d21e1 356 LWIP_ASSERT("netif->state != NULL", (netif->state != NULL));
ICTFBI 0:4edb816d21e1 357
ICTFBI 0:4edb816d21e1 358 priv = netif->state;
ICTFBI 0:4edb816d21e1 359
ICTFBI 0:4edb816d21e1 360 while ((p = slipif_input(netif, SLIP_DONTBLOCK)) != NULL) {
ICTFBI 0:4edb816d21e1 361 if (netif->input(p, netif) != ERR_OK) {
ICTFBI 0:4edb816d21e1 362 pbuf_free(p);
ICTFBI 0:4edb816d21e1 363 }
ICTFBI 0:4edb816d21e1 364 }
ICTFBI 0:4edb816d21e1 365 }
ICTFBI 0:4edb816d21e1 366
ICTFBI 0:4edb816d21e1 367 #endif /* LWIP_HAVE_SLIPIF */