Daniele Lacamera / PicoTCP-Experimental_CDC_ECM_Branch

Free (GPLv2) TCP/IP stack developed by TASS Belgium

Fork of PicoTCP by Daniele Lacamera

modules/pico_icmp4.c@21:909873ea3e67, 2013-06-09 (annotated)

Committer:
daniele
Date:
Sun Jun 09 08:01:58 2013 +0000
Revision:
21:909873ea3e67
Parent:
10:dd7111d4279f 
Disabled by default CRC checking, IP fragmentation, IP filters

Who changed what in which revision?

UserRevisionLine numberNew contents of line
daniele 10:dd7111d4279f 1 /*********************************************************************
daniele 10:dd7111d4279f 2 PicoTCP. Copyright (c) 2012 TASS Belgium NV. Some rights reserved.
daniele 10:dd7111d4279f 3 See LICENSE and COPYING for usage.
daniele 10:dd7111d4279f 4
daniele 10:dd7111d4279f 5 .
daniele 10:dd7111d4279f 6
daniele 10:dd7111d4279f 7 Authors: Daniele Lacamera
daniele 10:dd7111d4279f 8 *********************************************************************/
daniele 10:dd7111d4279f 9
daniele 10:dd7111d4279f 10
daniele 10:dd7111d4279f 11 #include "pico_icmp4.h"
daniele 10:dd7111d4279f 12 #include "pico_config.h"
daniele 10:dd7111d4279f 13 #include "pico_ipv4.h"
daniele 10:dd7111d4279f 14 #include "pico_eth.h"
daniele 10:dd7111d4279f 15 #include "pico_device.h"
daniele 10:dd7111d4279f 16 #include "pico_stack.h"
daniele 10:dd7111d4279f 17 #include "pico_tree.h"
daniele 10:dd7111d4279f 18
daniele 10:dd7111d4279f 19 /* Queues */
daniele 10:dd7111d4279f 20 static struct pico_queue icmp_in = {};
daniele 10:dd7111d4279f 21 static struct pico_queue icmp_out = {};
daniele 10:dd7111d4279f 22
daniele 10:dd7111d4279f 23
daniele 10:dd7111d4279f 24 /* Functions */
daniele 10:dd7111d4279f 25
daniele 10:dd7111d4279f 26 static int pico_icmp4_checksum(struct pico_frame *f)
daniele 10:dd7111d4279f 27 {
daniele 10:dd7111d4279f 28 struct pico_icmp4_hdr *hdr = (struct pico_icmp4_hdr *) f->transport_hdr;
daniele 10:dd7111d4279f 29 if (!hdr) {
daniele 10:dd7111d4279f 30 pico_err = PICO_ERR_EINVAL;
daniele 10:dd7111d4279f 31 return -1;
daniele 10:dd7111d4279f 32 }
daniele 10:dd7111d4279f 33 hdr->crc = 0;
daniele 10:dd7111d4279f 34 hdr->crc = short_be(pico_checksum(hdr, f->transport_len));
daniele 10:dd7111d4279f 35 return 0;
daniele 10:dd7111d4279f 36 }
daniele 10:dd7111d4279f 37
daniele 10:dd7111d4279f 38 #ifdef PICO_SUPPORT_PING
daniele 10:dd7111d4279f 39 static void ping_recv_reply(struct pico_frame *f);
daniele 10:dd7111d4279f 40 #endif
daniele 10:dd7111d4279f 41
daniele 10:dd7111d4279f 42 static int pico_icmp4_process_in(struct pico_protocol *self, struct pico_frame *f)
daniele 10:dd7111d4279f 43 {
daniele 10:dd7111d4279f 44 struct pico_icmp4_hdr *hdr = (struct pico_icmp4_hdr *) f->transport_hdr;
daniele 10:dd7111d4279f 45 if (hdr->type == PICO_ICMP_ECHO) {
daniele 10:dd7111d4279f 46 hdr->type = PICO_ICMP_ECHOREPLY;
daniele 10:dd7111d4279f 47 /* Ugly, but the best way to get ICMP data size here. */
daniele 10:dd7111d4279f 48 f->transport_len = f->buffer_len - PICO_SIZE_IP4HDR;
daniele 10:dd7111d4279f 49 if (f->dev->eth)
daniele 10:dd7111d4279f 50 f->transport_len -= PICO_SIZE_ETHHDR;
daniele 10:dd7111d4279f 51 pico_icmp4_checksum(f);
daniele 10:dd7111d4279f 52 f->net_hdr = f->transport_hdr - PICO_SIZE_IP4HDR;
daniele 10:dd7111d4279f 53 f->start = f->net_hdr;
daniele 10:dd7111d4279f 54 f->len = f->buffer_len;
daniele 10:dd7111d4279f 55 if (f->dev->eth)
daniele 10:dd7111d4279f 56 f->len -= PICO_SIZE_ETHHDR;
daniele 10:dd7111d4279f 57 pico_ipv4_rebound(f);
daniele 10:dd7111d4279f 58 } else if (hdr->type == PICO_ICMP_UNREACH) {
daniele 10:dd7111d4279f 59 f->net_hdr = f->transport_hdr + PICO_ICMPHDR_UN_SIZE;
daniele 10:dd7111d4279f 60 pico_ipv4_unreachable(f, hdr->code);
daniele 10:dd7111d4279f 61 } else if (hdr->type == PICO_ICMP_ECHOREPLY) {
daniele 10:dd7111d4279f 62 #ifdef PICO_SUPPORT_PING
daniele 10:dd7111d4279f 63 ping_recv_reply(f);
daniele 10:dd7111d4279f 64 #endif
daniele 10:dd7111d4279f 65 pico_frame_discard(f);
daniele 10:dd7111d4279f 66 } else {
daniele 10:dd7111d4279f 67 pico_frame_discard(f);
daniele 10:dd7111d4279f 68 }
daniele 10:dd7111d4279f 69 return 0;
daniele 10:dd7111d4279f 70 }
daniele 10:dd7111d4279f 71
daniele 10:dd7111d4279f 72 static int pico_icmp4_process_out(struct pico_protocol *self, struct pico_frame *f)
daniele 10:dd7111d4279f 73 {
daniele 10:dd7111d4279f 74 dbg("Called %s\n", __FUNCTION__);
daniele 10:dd7111d4279f 75 return 0;
daniele 10:dd7111d4279f 76 }
daniele 10:dd7111d4279f 77
daniele 10:dd7111d4279f 78 /* Interface: protocol definition */
daniele 10:dd7111d4279f 79 struct pico_protocol pico_proto_icmp4 = {
daniele 10:dd7111d4279f 80 .name = "icmp4",
daniele 10:dd7111d4279f 81 .proto_number = PICO_PROTO_ICMP4,
daniele 10:dd7111d4279f 82 .layer = PICO_LAYER_TRANSPORT,
daniele 10:dd7111d4279f 83 .process_in = pico_icmp4_process_in,
daniele 10:dd7111d4279f 84 .process_out = pico_icmp4_process_out,
daniele 10:dd7111d4279f 85 .q_in = &icmp_in,
daniele 10:dd7111d4279f 86 .q_out = &icmp_out,
daniele 10:dd7111d4279f 87 };
daniele 10:dd7111d4279f 88
daniele 10:dd7111d4279f 89 static int pico_icmp4_notify(struct pico_frame *f, uint8_t type, uint8_t code)
daniele 10:dd7111d4279f 90 {
daniele 10:dd7111d4279f 91 struct pico_frame *reply;
daniele 10:dd7111d4279f 92 struct pico_icmp4_hdr *hdr;
daniele 10:dd7111d4279f 93 struct pico_ipv4_hdr *info;
daniele 10:dd7111d4279f 94 if (f == NULL) {
daniele 10:dd7111d4279f 95 pico_err = PICO_ERR_EINVAL;
daniele 10:dd7111d4279f 96 return -1;
daniele 10:dd7111d4279f 97 }
daniele 10:dd7111d4279f 98 reply = pico_proto_ipv4.alloc(&pico_proto_ipv4, 8 + sizeof(struct pico_ipv4_hdr) + PICO_ICMPHDR_UN_SIZE);
daniele 10:dd7111d4279f 99 info = (struct pico_ipv4_hdr*)(f->net_hdr);
daniele 10:dd7111d4279f 100 hdr = (struct pico_icmp4_hdr *) reply->transport_hdr;
daniele 10:dd7111d4279f 101 hdr->type = type;
daniele 10:dd7111d4279f 102 hdr->code = code;
daniele 10:dd7111d4279f 103 hdr->hun.ih_pmtu.ipm_nmtu = short_be(1500);
daniele 10:dd7111d4279f 104 hdr->hun.ih_pmtu.ipm_void = 0;
daniele 10:dd7111d4279f 105 reply->transport_len = 8 + sizeof(struct pico_ipv4_hdr) + PICO_ICMPHDR_UN_SIZE;
daniele 10:dd7111d4279f 106 reply->payload = reply->transport_hdr + PICO_ICMPHDR_UN_SIZE;
daniele 10:dd7111d4279f 107 memcpy(reply->payload, f->net_hdr, 8 + sizeof(struct pico_ipv4_hdr));
daniele 10:dd7111d4279f 108 pico_icmp4_checksum(reply);
daniele 10:dd7111d4279f 109 pico_ipv4_frame_push(reply, &info->src, PICO_PROTO_ICMP4);
daniele 10:dd7111d4279f 110 return 0;
daniele 10:dd7111d4279f 111 }
daniele 10:dd7111d4279f 112
daniele 10:dd7111d4279f 113 int pico_icmp4_port_unreachable(struct pico_frame *f)
daniele 10:dd7111d4279f 114 {
daniele 10:dd7111d4279f 115 /*Parameter check executed in pico_icmp4_notify*/
daniele 10:dd7111d4279f 116 return pico_icmp4_notify(f, PICO_ICMP_UNREACH, PICO_ICMP_UNREACH_PORT);
daniele 10:dd7111d4279f 117 }
daniele 10:dd7111d4279f 118
daniele 10:dd7111d4279f 119 int pico_icmp4_proto_unreachable(struct pico_frame *f)
daniele 10:dd7111d4279f 120 {
daniele 10:dd7111d4279f 121 /*Parameter check executed in pico_icmp4_notify*/
daniele 10:dd7111d4279f 122 return pico_icmp4_notify(f, PICO_ICMP_UNREACH, PICO_ICMP_UNREACH_PROTOCOL);
daniele 10:dd7111d4279f 123 }
daniele 10:dd7111d4279f 124
daniele 10:dd7111d4279f 125 int pico_icmp4_dest_unreachable(struct pico_frame *f)
daniele 10:dd7111d4279f 126 {
daniele 10:dd7111d4279f 127 /*Parameter check executed in pico_icmp4_notify*/
daniele 10:dd7111d4279f 128 return pico_icmp4_notify(f, PICO_ICMP_UNREACH, PICO_ICMP_UNREACH_HOST);
daniele 10:dd7111d4279f 129 }
daniele 10:dd7111d4279f 130
daniele 10:dd7111d4279f 131 int pico_icmp4_ttl_expired(struct pico_frame *f)
daniele 10:dd7111d4279f 132 {
daniele 10:dd7111d4279f 133 /*Parameter check executed in pico_icmp4_notify*/
daniele 10:dd7111d4279f 134 return pico_icmp4_notify(f, PICO_ICMP_TIME_EXCEEDED, PICO_ICMP_TIMXCEED_INTRANS);
daniele 10:dd7111d4279f 135 }
daniele 10:dd7111d4279f 136
daniele 21:909873ea3e67 137
daniele 10:dd7111d4279f 138 int pico_icmp4_packet_filtered(struct pico_frame *f)
daniele 10:dd7111d4279f 139 {
daniele 10:dd7111d4279f 140 /*Parameter check executed in pico_icmp4_notify*/
daniele 10:dd7111d4279f 141 /*Packet Filtered: type 3, code 13 (Communication Administratively Prohibited)*/
daniele 10:dd7111d4279f 142 return pico_icmp4_notify(f, PICO_ICMP_UNREACH, PICO_ICMP_UNREACH_FILTER_PROHIB);
daniele 10:dd7111d4279f 143 }
daniele 21:909873ea3e67 144
daniele 10:dd7111d4279f 145
daniele 10:dd7111d4279f 146 /***********************/
daniele 10:dd7111d4279f 147 /* Ping implementation */
daniele 10:dd7111d4279f 148 /***********************/
daniele 10:dd7111d4279f 149 /***********************/
daniele 10:dd7111d4279f 150 /***********************/
daniele 10:dd7111d4279f 151 /***********************/
daniele 10:dd7111d4279f 152
daniele 10:dd7111d4279f 153
daniele 10:dd7111d4279f 154 #ifdef PICO_SUPPORT_PING
daniele 10:dd7111d4279f 155
daniele 10:dd7111d4279f 156
daniele 10:dd7111d4279f 157 struct pico_icmp4_ping_cookie
daniele 10:dd7111d4279f 158 {
daniele 10:dd7111d4279f 159 struct pico_ip4 dst;
daniele 10:dd7111d4279f 160 uint16_t err;
daniele 10:dd7111d4279f 161 uint16_t id;
daniele 10:dd7111d4279f 162 uint16_t seq;
daniele 10:dd7111d4279f 163 uint16_t size;
daniele 10:dd7111d4279f 164 int count;
daniele 10:dd7111d4279f 165 unsigned long timestamp;
daniele 10:dd7111d4279f 166 int interval;
daniele 10:dd7111d4279f 167 int timeout;
daniele 10:dd7111d4279f 168 void (*cb)(struct pico_icmp4_stats*);
daniele 10:dd7111d4279f 169
daniele 10:dd7111d4279f 170 };
daniele 10:dd7111d4279f 171
daniele 10:dd7111d4279f 172 static int cookie_compare(void *ka, void *kb)
daniele 10:dd7111d4279f 173 {
daniele 10:dd7111d4279f 174 struct pico_icmp4_ping_cookie *a = ka, *b = kb;
daniele 10:dd7111d4279f 175 if (a->id < b->id)
daniele 10:dd7111d4279f 176 return -1;
daniele 10:dd7111d4279f 177 if (a->id > b->id)
daniele 10:dd7111d4279f 178 return 1;
daniele 10:dd7111d4279f 179 return (a->seq - b->seq);
daniele 10:dd7111d4279f 180 }
daniele 10:dd7111d4279f 181
daniele 10:dd7111d4279f 182 PICO_TREE_DECLARE(Pings,cookie_compare);
daniele 10:dd7111d4279f 183
daniele 10:dd7111d4279f 184 static int pico_icmp4_send_echo(struct pico_icmp4_ping_cookie *cookie)
daniele 10:dd7111d4279f 185 {
daniele 10:dd7111d4279f 186 struct pico_frame *echo = pico_proto_ipv4.alloc(&pico_proto_ipv4, PICO_ICMPHDR_UN_SIZE + cookie->size);
daniele 10:dd7111d4279f 187 struct pico_icmp4_hdr *hdr;
daniele 10:dd7111d4279f 188
daniele 10:dd7111d4279f 189 hdr = (struct pico_icmp4_hdr *) echo->transport_hdr;
daniele 10:dd7111d4279f 190
daniele 10:dd7111d4279f 191 hdr->type = PICO_ICMP_ECHO;
daniele 10:dd7111d4279f 192 hdr->code = 0;
daniele 10:dd7111d4279f 193 hdr->hun.ih_idseq.idseq_id = short_be(cookie->id);
daniele 10:dd7111d4279f 194 hdr->hun.ih_idseq.idseq_seq = short_be(cookie->seq);
daniele 10:dd7111d4279f 195 echo->transport_len = PICO_ICMPHDR_UN_SIZE + cookie->size;
daniele 10:dd7111d4279f 196 echo->payload = echo->transport_hdr + PICO_ICMPHDR_UN_SIZE;
daniele 10:dd7111d4279f 197 echo->payload_len = cookie->size;
daniele 10:dd7111d4279f 198 /* XXX: Fill payload */
daniele 10:dd7111d4279f 199 pico_icmp4_checksum(echo);
daniele 10:dd7111d4279f 200 pico_ipv4_frame_push(echo, &cookie->dst, PICO_PROTO_ICMP4);
daniele 10:dd7111d4279f 201 return 0;
daniele 10:dd7111d4279f 202 }
daniele 10:dd7111d4279f 203
daniele 10:dd7111d4279f 204
daniele 10:dd7111d4279f 205 static void ping_timeout(unsigned long now, void *arg)
daniele 10:dd7111d4279f 206 {
daniele 10:dd7111d4279f 207 struct pico_icmp4_ping_cookie *cookie = (struct pico_icmp4_ping_cookie *)arg;
daniele 10:dd7111d4279f 208 if(pico_tree_findKey(&Pings,cookie)){
daniele 10:dd7111d4279f 209 if (cookie->err == PICO_PING_ERR_PENDING) {
daniele 10:dd7111d4279f 210 struct pico_icmp4_stats stats;
daniele 10:dd7111d4279f 211 stats.dst = cookie->dst;
daniele 10:dd7111d4279f 212 stats.seq = cookie->seq;
daniele 10:dd7111d4279f 213 stats.time = 0;
daniele 10:dd7111d4279f 214 stats.size = cookie->size;
daniele 10:dd7111d4279f 215 stats.err = PICO_PING_ERR_TIMEOUT;
daniele 10:dd7111d4279f 216 dbg(" ---- Ping timeout!!!\n");
daniele 10:dd7111d4279f 217 cookie->cb(&stats);
daniele 10:dd7111d4279f 218 }
daniele 10:dd7111d4279f 219
daniele 10:dd7111d4279f 220 pico_tree_delete(&Pings,cookie);
daniele 10:dd7111d4279f 221 pico_free(cookie);
daniele 10:dd7111d4279f 222 }
daniele 10:dd7111d4279f 223 }
daniele 10:dd7111d4279f 224
daniele 10:dd7111d4279f 225 static void next_ping(unsigned long now, void *arg);
daniele 10:dd7111d4279f 226 static inline void send_ping(struct pico_icmp4_ping_cookie *cookie)
daniele 10:dd7111d4279f 227 {
daniele 10:dd7111d4279f 228 pico_icmp4_send_echo(cookie);
daniele 10:dd7111d4279f 229 cookie->timestamp = pico_tick;
daniele 10:dd7111d4279f 230 pico_timer_add(cookie->timeout, ping_timeout, cookie);
daniele 10:dd7111d4279f 231 if (cookie->seq < cookie->count)
daniele 10:dd7111d4279f 232 pico_timer_add(cookie->interval, next_ping, cookie);
daniele 10:dd7111d4279f 233 }
daniele 10:dd7111d4279f 234
daniele 10:dd7111d4279f 235 static void next_ping(unsigned long now, void *arg)
daniele 10:dd7111d4279f 236 {
daniele 10:dd7111d4279f 237 struct pico_icmp4_ping_cookie *newcookie, *cookie = (struct pico_icmp4_ping_cookie *)arg;
daniele 10:dd7111d4279f 238
daniele 10:dd7111d4279f 239 if(pico_tree_findKey(&Pings,cookie)){
daniele 10:dd7111d4279f 240 if (cookie->seq < cookie->count) {
daniele 10:dd7111d4279f 241 newcookie = pico_zalloc(sizeof(struct pico_icmp4_ping_cookie));
daniele 10:dd7111d4279f 242 if (!newcookie)
daniele 10:dd7111d4279f 243 return;
daniele 10:dd7111d4279f 244 memcpy(newcookie, cookie, sizeof(struct pico_icmp4_ping_cookie));
daniele 10:dd7111d4279f 245 newcookie->seq++;
daniele 10:dd7111d4279f 246
daniele 10:dd7111d4279f 247 pico_tree_insert(&Pings,newcookie);
daniele 10:dd7111d4279f 248 send_ping(newcookie);
daniele 10:dd7111d4279f 249 }
daniele 10:dd7111d4279f 250 }
daniele 10:dd7111d4279f 251 }
daniele 10:dd7111d4279f 252
daniele 10:dd7111d4279f 253
daniele 10:dd7111d4279f 254 static void ping_recv_reply(struct pico_frame *f)
daniele 10:dd7111d4279f 255 {
daniele 10:dd7111d4279f 256 struct pico_icmp4_ping_cookie test, *cookie;
daniele 10:dd7111d4279f 257 struct pico_icmp4_hdr *hdr = (struct pico_icmp4_hdr *) f->transport_hdr;
daniele 10:dd7111d4279f 258 test.id = short_be(hdr->hun.ih_idseq.idseq_id );
daniele 10:dd7111d4279f 259 test.seq = short_be(hdr->hun.ih_idseq.idseq_seq);
daniele 10:dd7111d4279f 260
daniele 10:dd7111d4279f 261 cookie = pico_tree_findKey(&Pings, &test);
daniele 10:dd7111d4279f 262 if (cookie) {
daniele 10:dd7111d4279f 263 struct pico_icmp4_stats stats;
daniele 10:dd7111d4279f 264 cookie->err = PICO_PING_ERR_REPLIED;
daniele 10:dd7111d4279f 265 stats.dst = cookie->dst;
daniele 10:dd7111d4279f 266 stats.seq = cookie->seq;
daniele 10:dd7111d4279f 267 stats.size = cookie->size;
daniele 10:dd7111d4279f 268 stats.time = pico_tick - cookie->timestamp;
daniele 10:dd7111d4279f 269 stats.err = cookie->err;
daniele 10:dd7111d4279f 270 stats.ttl = ((struct pico_ipv4_hdr *)f->net_hdr)->ttl;
daniele 10:dd7111d4279f 271 if(cookie->cb != NULL)
daniele 10:dd7111d4279f 272 cookie->cb(&stats);
daniele 10:dd7111d4279f 273 } else {
daniele 10:dd7111d4279f 274 dbg("Reply for seq=%d, not found.\n", test.seq);
daniele 10:dd7111d4279f 275 }
daniele 10:dd7111d4279f 276 }
daniele 10:dd7111d4279f 277
daniele 10:dd7111d4279f 278 int pico_icmp4_ping(char *dst, int count, int interval, int timeout, int size, void (*cb)(struct pico_icmp4_stats *))
daniele 10:dd7111d4279f 279 {
daniele 10:dd7111d4279f 280 static uint16_t next_id = 0x91c0;
daniele 10:dd7111d4279f 281 struct pico_icmp4_ping_cookie *cookie;
daniele 10:dd7111d4279f 282
daniele 10:dd7111d4279f 283 if((dst == NULL) || (interval == 0) || (timeout == 0) || (count == 0)){
daniele 10:dd7111d4279f 284 pico_err = PICO_ERR_EINVAL;
daniele 10:dd7111d4279f 285 return -1;
daniele 10:dd7111d4279f 286 }
daniele 10:dd7111d4279f 287
daniele 10:dd7111d4279f 288 cookie = pico_zalloc(sizeof(struct pico_icmp4_ping_cookie));
daniele 10:dd7111d4279f 289 if (!cookie) {
daniele 10:dd7111d4279f 290 pico_err = PICO_ERR_ENOMEM;
daniele 10:dd7111d4279f 291 return -1;
daniele 10:dd7111d4279f 292 }
daniele 10:dd7111d4279f 293
daniele 10:dd7111d4279f 294 if (pico_string_to_ipv4(dst, &cookie->dst.addr) < 0) {
daniele 10:dd7111d4279f 295 pico_err = PICO_ERR_EINVAL;
daniele 10:dd7111d4279f 296 pico_free(cookie);
daniele 10:dd7111d4279f 297 return -1;
daniele 10:dd7111d4279f 298 }
daniele 10:dd7111d4279f 299 cookie->seq = 1;
daniele 10:dd7111d4279f 300 cookie->id = next_id++;
daniele 10:dd7111d4279f 301 cookie->err = PICO_PING_ERR_PENDING;
daniele 10:dd7111d4279f 302 cookie->size = size;
daniele 10:dd7111d4279f 303 cookie->interval = interval;
daniele 10:dd7111d4279f 304 cookie->timeout = timeout;
daniele 10:dd7111d4279f 305 cookie->cb = cb;
daniele 10:dd7111d4279f 306 cookie->count = count;
daniele 10:dd7111d4279f 307
daniele 10:dd7111d4279f 308 pico_tree_insert(&Pings,cookie);
daniele 10:dd7111d4279f 309 send_ping(cookie);
daniele 10:dd7111d4279f 310
daniele 10:dd7111d4279f 311 return 0;
daniele 10:dd7111d4279f 312
daniele 10:dd7111d4279f 313 }
daniele 10:dd7111d4279f 314
daniele 10:dd7111d4279f 315 #endif