Travis Geiselbrecht | 1d0df69 | 2008-09-01 02:26:09 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (c) 2001-2004 Swedish Institute of Computer Science. |
| 3 | * All rights reserved. |
| 4 | * |
| 5 | * Redistribution and use in source and binary forms, with or without |
| 6 | * modification, are permitted provided that the following conditions |
| 7 | * are met: |
| 8 | * 1. Redistributions of source code must retain the above copyright |
| 9 | * notice, this list of conditions and the following disclaimer. |
| 10 | * 2. Redistributions in binary form must reproduce the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer in the |
| 12 | * documentation and/or other materials provided with the distribution. |
| 13 | * 3. Neither the name of the Institute nor the names of its contributors |
| 14 | * may be used to endorse or promote products derived from this software |
| 15 | * without specific prior written permission. |
| 16 | * |
| 17 | * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND |
| 18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE |
| 21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 27 | * SUCH DAMAGE. |
| 28 | * |
| 29 | * This file is built upon the file: src/arch/rtxc/netif/sioslip.c |
| 30 | * |
| 31 | * Author: Magnus Ivarsson <magnus.ivarsson(at)volvo.com> |
| 32 | */ |
| 33 | |
| 34 | /* |
| 35 | * This is an arch independent SLIP netif. The specific serial hooks must be |
| 36 | * provided by another file. They are sio_open, sio_recv and sio_send |
| 37 | */ |
| 38 | |
| 39 | #include "netif/slipif.h" |
| 40 | #include "lwip/opt.h" |
| 41 | #include "lwip/def.h" |
| 42 | #include "lwip/pbuf.h" |
| 43 | #include "lwip/sys.h" |
| 44 | #include "lwip/stats.h" |
| 45 | #include "lwip/sio.h" |
| 46 | |
| 47 | #define SLIP_END 0300 |
| 48 | #define SLIP_ESC 0333 |
| 49 | #define SLIP_ESC_END 0334 |
| 50 | #define SLIP_ESC_ESC 0335 |
| 51 | |
| 52 | #define MAX_SIZE 1500 |
| 53 | |
| 54 | /** |
| 55 | * Send a pbuf doing the necessary SLIP encapsulation |
| 56 | * |
| 57 | * Uses the serial layer's sio_send() |
| 58 | */ |
| 59 | err_t |
| 60 | slipif_output(struct netif *netif, struct pbuf *p, struct ip_addr *ipaddr) |
| 61 | { |
| 62 | struct pbuf *q; |
| 63 | u16_t i; |
| 64 | u8_t c; |
| 65 | |
| 66 | /* Send pbuf out on the serial I/O device. */ |
| 67 | sio_send(SLIP_END, netif->state); |
| 68 | |
| 69 | for (q = p; q != NULL; q = q->next) { |
| 70 | for (i = 0; i < q->len; i++) { |
| 71 | c = ((u8_t *)q->payload)[i]; |
| 72 | switch (c) { |
| 73 | case SLIP_END: |
| 74 | sio_send(SLIP_ESC, netif->state); |
| 75 | sio_send(SLIP_ESC_END, netif->state); |
| 76 | break; |
| 77 | case SLIP_ESC: |
| 78 | sio_send(SLIP_ESC, netif->state); |
| 79 | sio_send(SLIP_ESC_ESC, netif->state); |
| 80 | break; |
| 81 | default: |
| 82 | sio_send(c, netif->state); |
| 83 | break; |
| 84 | } |
| 85 | } |
| 86 | } |
| 87 | sio_send(SLIP_END, netif->state); |
| 88 | return 0; |
| 89 | } |
| 90 | |
| 91 | /** |
| 92 | * Handle the incoming SLIP stream character by character |
| 93 | * |
| 94 | * Poll the serial layer by calling sio_recv() |
| 95 | * |
| 96 | * @return The IP packet when SLIP_END is received |
| 97 | */ |
| 98 | static struct pbuf * |
| 99 | slipif_input(struct netif *netif) |
| 100 | { |
| 101 | u8_t c; |
| 102 | struct pbuf *p, *q; |
| 103 | u16_t recved; |
| 104 | u16_t i; |
| 105 | |
| 106 | q = p = NULL; |
| 107 | recved = i = 0; |
| 108 | c = 0; |
| 109 | |
| 110 | while (1) { |
| 111 | c = sio_recv(netif->state); |
| 112 | switch (c) { |
| 113 | case SLIP_END: |
| 114 | if (recved > 0) { |
| 115 | /* Received whole packet. */ |
| 116 | pbuf_realloc(q, recved); |
| 117 | |
| 118 | LINK_STATS_INC(link.recv); |
| 119 | |
| 120 | LWIP_DEBUGF(SLIP_DEBUG, ("slipif: Got packet\n")); |
| 121 | return q; |
| 122 | } |
| 123 | break; |
| 124 | |
| 125 | case SLIP_ESC: |
| 126 | c = sio_recv(netif->state); |
| 127 | switch (c) { |
| 128 | case SLIP_ESC_END: |
| 129 | c = SLIP_END; |
| 130 | break; |
| 131 | case SLIP_ESC_ESC: |
| 132 | c = SLIP_ESC; |
| 133 | break; |
| 134 | } |
| 135 | /* FALLTHROUGH */ |
| 136 | |
| 137 | default: |
| 138 | if (p == NULL) { |
| 139 | LWIP_DEBUGF(SLIP_DEBUG, ("slipif_input: alloc\n")); |
| 140 | p = pbuf_alloc(PBUF_LINK, PBUF_POOL_BUFSIZE, PBUF_POOL); |
| 141 | |
| 142 | if (p == NULL) { |
| 143 | LINK_STATS_INC(link.drop); |
| 144 | LWIP_DEBUGF(SLIP_DEBUG, ("slipif_input: no new pbuf! (DROP)\n")); |
| 145 | } |
| 146 | |
| 147 | if (q != NULL) { |
| 148 | pbuf_cat(q, p); |
| 149 | } else { |
| 150 | q = p; |
| 151 | } |
| 152 | } |
| 153 | if (p != NULL && recved < MAX_SIZE) { |
| 154 | ((u8_t *)p->payload)[i] = c; |
| 155 | recved++; |
| 156 | i++; |
| 157 | if (i >= p->len) { |
| 158 | i = 0; |
| 159 | if (p->next != NULL && p->next->len > 0) |
| 160 | p = p->next; |
| 161 | else |
| 162 | p = NULL; |
| 163 | } |
| 164 | } |
| 165 | break; |
| 166 | } |
| 167 | |
| 168 | } |
| 169 | return NULL; |
| 170 | } |
| 171 | |
| 172 | /** |
| 173 | * The SLIP input thread. |
| 174 | * |
| 175 | * Feed the IP layer with incoming packets |
| 176 | */ |
| 177 | static void |
| 178 | slipif_loop(void *nf) |
| 179 | { |
| 180 | struct pbuf *p; |
| 181 | struct netif *netif = (struct netif *)nf; |
| 182 | |
| 183 | while (1) { |
| 184 | p = slipif_input(netif); |
| 185 | netif->input(p, netif); |
| 186 | } |
| 187 | } |
| 188 | |
| 189 | /** |
| 190 | * SLIP netif initialization |
| 191 | * |
| 192 | * Call the arch specific sio_open and remember |
| 193 | * the opened device in the state field of the netif. |
| 194 | */ |
| 195 | err_t |
| 196 | slipif_init(struct netif *netif) |
| 197 | { |
| 198 | |
| 199 | LWIP_DEBUGF(SLIP_DEBUG, ("slipif_init: netif->num=%"U16_F"\n", (u16_t)netif->num)); |
| 200 | |
| 201 | netif->name[0] = 's'; |
| 202 | netif->name[1] = 'l'; |
| 203 | netif->output = slipif_output; |
| 204 | netif->mtu = 1500; |
| 205 | netif->flags = NETIF_FLAG_POINTTOPOINT; |
| 206 | |
| 207 | netif->state = sio_open(netif->num); |
| 208 | if (!netif->state) |
| 209 | return ERR_IF; |
| 210 | |
| 211 | sys_thread_new(slipif_loop, netif, SLIPIF_THREAD_PRIO); |
| 212 | return ERR_OK; |
| 213 | } |