/* * The default ICMP handler only handles ICMP incoming echo request and * outgoing echo reply. */ static void default_icmp_handler(pktbuf_t *pkt, ip_route_t *dest) { word cksum; if (pkt->icmp_hdr->type == ICMP_TYPE_ECHOREQUEST && pkt->icmp_hdr->code == 0 && __sum((word *)pkt->icmp_hdr, pkt->pkt_bytes, 0) == 0) { pkt->icmp_hdr->type = ICMP_TYPE_ECHOREPLY; pkt->icmp_hdr->checksum = 0; cksum = __sum((word *)pkt->icmp_hdr, pkt->pkt_bytes, 0); pkt->icmp_hdr->checksum = htons(cksum); __ip_send(pkt, IP_PROTO_ICMP, dest); } }
/* * Send a UDP packet. */ int __udp_send(char *buf, int len, ip_route_t *dest_ip, word dest_port, word src_port) { pktbuf_t *pkt; udp_header_t *udp; ip_header_t *ip; unsigned short cksum; int ret; /* dumb */ if (len > MAX_UDP_DATA) return -1; /* just drop it if can't get a buffer */ if ((pkt = __pktbuf_alloc(ETH_MAX_PKTLEN)) == NULL) return -1; udp = pkt->udp_hdr; ip = pkt->ip_hdr; pkt->pkt_bytes = len + sizeof(udp_header_t); udp->src_port = htons(src_port); udp->dest_port = htons(dest_port); udp->length = htons(pkt->pkt_bytes); udp->checksum = 0; memcpy(((char *)udp) + sizeof(udp_header_t), buf, len); /* fill in some pseudo-header fields */ memcpy(ip->source, __local_ip_addr, sizeof(ip_addr_t)); memcpy(ip->destination, dest_ip->ip_addr, sizeof(ip_addr_t)); ip->protocol = IP_PROTO_UDP; ip->length = udp->length; cksum = __sum((word *)udp, pkt->pkt_bytes, __pseudo_sum(ip)); udp->checksum = htons(cksum); ret = __ip_send(pkt, IP_PROTO_UDP, dest_ip); __pktbuf_free(pkt); return ret; }
static void handle_icmp(pktbuf_t * pkt, ip_route_t * src_route) { icmp_header_t *icmp; unsigned short cksum; icmp = pkt->icmp_hdr; if (icmp->type == ICMP_TYPE_ECHOREQUEST && icmp->code == 0 && __sum((word *) icmp, pkt->pkt_bytes, 0) == 0) { icmp->type = ICMP_TYPE_ECHOREPLY; icmp->checksum = 0; cksum = __sum((word *) icmp, pkt->pkt_bytes, 0); icmp->checksum = htons(cksum); __ip_send(pkt, IP_PROTO_ICMP, src_route); } else if (icmp->type == ICMP_TYPE_ECHOREPLY) { memcpy(&hold_hdr, icmp, sizeof(*icmp)); icmp_received = true; } }
static void do_ping(int argc, char *argv[]) { struct option_info opts[7]; long count, timeout, length, rate, start_time, end_time, timer, received, tries; char *local_ip_addr, *host_ip_addr; bool local_ip_addr_set, host_ip_addr_set, count_set, timeout_set, length_set, rate_set, verbose; struct sockaddr_in local_addr, host_addr; ip_addr_t hold_addr; icmp_header_t *icmp; pktbuf_t *pkt; ip_header_t *ip; unsigned short cksum; ip_route_t dest_ip; init_opts(&opts[0], 'n', true, OPTION_ARG_TYPE_NUM, (void *)&count, (bool *) & count_set, "<count> - number of packets to test"); init_opts(&opts[1], 't', true, OPTION_ARG_TYPE_NUM, (void *)&timeout, (bool *) & timeout_set, "<timeout> - max #ms per packet [rount trip]"); init_opts(&opts[2], 'i', true, OPTION_ARG_TYPE_STR, (void *)&local_ip_addr, (bool *) & local_ip_addr_set, "local IP address"); init_opts(&opts[3], 'h', true, OPTION_ARG_TYPE_STR, (void *)&host_ip_addr, (bool *) & host_ip_addr_set, "host name or IP address"); init_opts(&opts[4], 'l', true, OPTION_ARG_TYPE_NUM, (void *)&length, (bool *) & length_set, "<length> - size of payload"); init_opts(&opts[5], 'v', false, OPTION_ARG_TYPE_FLG, (void *)&verbose, (bool *) 0, "verbose operation"); init_opts(&opts[6], 'r', true, OPTION_ARG_TYPE_NUM, (void *)&rate, (bool *) & rate_set, "<rate> - time between packets"); if (!scan_opts(argc, argv, 1, opts, 7, (void **)0, 0, "")) { diag_printf("PING - Invalid option specified\n"); return; } // Set defaults; this has to be done _after_ the scan, since it will // have destroyed all values not explicitly set. if (local_ip_addr_set) { if (!_gethostbyname(local_ip_addr, (in_addr_t *) & local_addr)) { diag_printf("PING - Invalid local name: %s\n", local_ip_addr); return; } } else { memcpy((in_addr_t *) & local_addr, __local_ip_addr, sizeof(__local_ip_addr)); } if (host_ip_addr_set) { if (!_gethostbyname(host_ip_addr, (in_addr_t *) & host_addr)) { diag_printf("PING - Invalid host name: %s\n", host_ip_addr); return; } if (__arp_lookup((ip_addr_t *) & host_addr.sin_addr, &dest_ip) < 0) { diag_printf("PING: Cannot reach server '%s' (%s)\n", host_ip_addr, inet_ntoa((in_addr_t *) & host_addr)); return; } } else { diag_printf("PING - host name or IP address required\n"); return; } #define DEFAULT_LENGTH 64 #define DEFAULT_COUNT 10 #define DEFAULT_TIMEOUT 1000 #define DEFAULT_RATE 1000 if (!rate_set) { rate = DEFAULT_RATE; } if (!length_set) { length = DEFAULT_LENGTH; } if ((length < 64) || (length > 1400)) { diag_printf("Invalid length specified: %ld\n", length); return; } if (!count_set) { count = DEFAULT_COUNT; } if (!timeout_set) { timeout = DEFAULT_TIMEOUT; } // Note: two prints here because 'inet_ntoa' returns a static pointer diag_printf("Network PING - from %s", inet_ntoa((in_addr_t *) & local_addr)); diag_printf(" to %s\n", inet_ntoa((in_addr_t *) & host_addr)); received = 0; __icmp_install_listener(handle_icmp); // Save default "local" address memcpy(hold_addr, __local_ip_addr, sizeof(hold_addr)); for (tries = 0; tries < count; tries++) { // The network stack uses the global variable '__local_ip_addr' memcpy(__local_ip_addr, &local_addr, sizeof(__local_ip_addr)); // Build 'ping' request if ((pkt = __pktbuf_alloc(ETH_MAX_PKTLEN)) == NULL) { // Give up if no packets - something is wrong break; } icmp = pkt->icmp_hdr; ip = pkt->ip_hdr; pkt->pkt_bytes = length + sizeof(icmp_header_t); icmp->type = ICMP_TYPE_ECHOREQUEST; icmp->code = 0; icmp->checksum = 0; icmp->seqnum = htons(tries + 1); cksum = __sum((word *) icmp, pkt->pkt_bytes, 0); icmp->checksum = htons(cksum); memcpy(ip->source, (in_addr_t *) & local_addr, sizeof(ip_addr_t)); memcpy(ip->destination, (in_addr_t *) & host_addr, sizeof(ip_addr_t)); ip->protocol = IP_PROTO_ICMP; ip->length = htons(pkt->pkt_bytes); __ip_send(pkt, IP_PROTO_ICMP, &dest_ip); __pktbuf_free(pkt); start_time = MS_TICKS(); timer = start_time + timeout; icmp_received = false; while (!icmp_received && (MS_TICKS_DELAY() < timer)) { if (_rb_break(1)) { goto abort; } MS_TICKS_DELAY(); __enet_poll(); } end_time = MS_TICKS(); timer = MS_TICKS() + rate; while (MS_TICKS_DELAY() < timer) { if (_rb_break(1)) { goto abort; } MS_TICKS_DELAY(); __enet_poll(); } if (icmp_received) { received++; if (verbose) { diag_printf(" seq: %ld, time: %ld (ticks)\n", ntohs(hold_hdr.seqnum), end_time - start_time); } } } abort: __icmp_remove_listener(); // Clean up memcpy(__local_ip_addr, &hold_addr, sizeof(__local_ip_addr)); // Report diag_printf("PING - received %ld of %ld expected\n", received, count); }