Jeremy Kerr | 42dc98c | 2016-02-25 10:23:14 +0800 | [diff] [blame^] | 1 | /****************************************************************************** |
| 2 | * Copyright 2016 Foxconn |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | ******************************************************************************/ |
| 16 | #define MAX_SERVER_NODE 24 |
| 17 | #define SKU1_MAX_SERVER_NODES 24 |
| 18 | |
| 19 | #define ETH_ARP_FRAME_LEN ( sizeof(struct ethhdr)+\ |
| 20 | sizeof(struct arphdr)+\ |
| 21 | ((ETH_ALEN+4)*2)\ |
| 22 | ) |
| 23 | |
| 24 | struct ARP_DATA { |
| 25 | unsigned char src_mac [ETH_ALEN];//source mac addr |
| 26 | unsigned char src_ip [4]; //source ip addr |
| 27 | unsigned char dest_mac[ETH_ALEN];//dest mac addr |
| 28 | unsigned char dest_ip [4]; //dest ip |
| 29 | }; |
| 30 | struct ETH_ARP_PACKET { |
| 31 | struct ethhdr eh; |
| 32 | struct arphdr arp; |
| 33 | struct ARP_DATA arp_data; |
| 34 | }; |
| 35 | |
| 36 | struct ETH_ARP_PACKET *inarp_req; |
| 37 | |
| 38 | static char based_mac[6] = {0,0,0,0,0,0}; |
| 39 | int send_arp_packet(int fd, |
| 40 | int ifindex, |
| 41 | struct ETH_ARP_PACKET *eth_arp, |
| 42 | __be16 ar_op, |
| 43 | unsigned char *src_mac, |
| 44 | unsigned char *src_ip, |
| 45 | unsigned char *dest_mac, |
| 46 | unsigned char *dest_ip |
| 47 | ) |
| 48 | { |
| 49 | int send_result = 0; |
| 50 | struct ethhdr *eh = ð_arp->eh; |
| 51 | struct arphdr *arp = ð_arp->arp; |
| 52 | struct ARP_DATA *arp_data = ð_arp->arp_data; |
| 53 | /*target address*/ |
| 54 | struct sockaddr_ll socket_address; |
| 55 | /*prepare sockaddr_ll*/ |
| 56 | /*RAW communication*/ |
| 57 | socket_address.sll_family = PF_PACKET; |
| 58 | /*we don't use a protocoll above ethernet layer |
| 59 | ->just use anything here*/ |
| 60 | socket_address.sll_protocol = htons(ETH_P_ARP); |
| 61 | /*index of the network device |
| 62 | see full code later how to retrieve it*/ |
| 63 | socket_address.sll_ifindex = ifindex; |
| 64 | /*ARP hardware identifier is ethernet*/ |
| 65 | socket_address.sll_hatype = ARPHRD_ETHER; |
| 66 | /*target is another host*/ |
| 67 | socket_address.sll_pkttype = PACKET_OTHERHOST; |
| 68 | /*address length*/ |
| 69 | socket_address.sll_halen = ETH_ALEN; |
| 70 | memcpy(socket_address.sll_addr, dest_mac, ETH_ALEN); |
| 71 | /*set the frame header*/ |
| 72 | memcpy((void*)eh->h_dest, (void*)dest_mac, ETH_ALEN); |
| 73 | memcpy((void*)eh->h_source, (void*)src_mac, ETH_ALEN); |
| 74 | eh->h_proto = htons(ETH_P_ARP); |
| 75 | /*fill InARP request data for ethernet + ipv4*/ |
| 76 | arp->ar_hrd = htons(ARPHRD_ETHER); |
| 77 | arp->ar_pro = htons(ETH_P_ARP); |
| 78 | arp->ar_hln = ETH_ALEN; |
| 79 | arp->ar_pln = 4; |
| 80 | arp->ar_op = htons(ar_op); |
| 81 | //fill arp ethernet mac & ipv4 info |
| 82 | arp_data = (void*)(arp + 1); |
| 83 | memcpy(arp_data->src_mac , (void*)src_mac, ETH_ALEN); //source mac addr |
| 84 | memcpy(arp_data->src_ip , src_ip, 4); //source ip addr |
| 85 | memcpy(arp_data->dest_mac, (void*)dest_mac, ETH_ALEN); //dest mac addr |
| 86 | memcpy(arp_data->dest_ip , dest_ip, 4); //dest ip |
| 87 | /*send the packet*/ |
| 88 | send_result = sendto(fd, eth_arp, ETH_ARP_FRAME_LEN, 0, |
| 89 | (struct sockaddr*)&socket_address, sizeof(socket_address)); |
| 90 | if (send_result == -1) { |
| 91 | printf("sendto: [%s]\n", strerror(errno)); |
| 92 | } |
| 93 | return send_result; |
| 94 | } |
| 95 | void show_mac_addr(char *name, unsigned char *mac_addr) |
| 96 | { |
| 97 | int i; |
| 98 | printf("%s MAC address: ", name); |
| 99 | for( i = 0; i < 6; i++ ) |
| 100 | { |
| 101 | printf("%.2X%c", (unsigned char)mac_addr[i], (i == 5) ? '\n': ':'); |
| 102 | } |
| 103 | return; |
| 104 | } |
| 105 | void show_ip_addr(char *desc, unsigned char *ip_addr) |
| 106 | { |
| 107 | int i; |
| 108 | printf("%s IPv4 address: ", desc); |
| 109 | for(i = 0; i < 4; i++ ) |
| 110 | { |
| 111 | printf("%d%c", (unsigned char)ip_addr[i], (i == 3) ? '\n': '.'); |
| 112 | } |
| 113 | } |
| 114 | void dump_data(char *desc, unsigned char *buffer, int length) |
| 115 | { |
| 116 | int i; |
| 117 | printf("%s & length is [%d]:\n", desc, length); |
| 118 | for (i=0; i<length; i++) { |
| 119 | printf ("[%02X]", 0xff & buffer[i]); |
| 120 | if ((i&0xf)==0x7) printf(" - "); |
| 121 | if ((i&0xf)==0xf) printf("\n"); |
| 122 | } |
| 123 | printf("\n"); |
| 124 | } |
| 125 | void get_mac_address_for_node_id(int node_id, char *mac_addr) { |
| 126 | int i; |
| 127 | int add = node_id; |
| 128 | int carry = 0; |
| 129 | int mac; |
| 130 | for (i=5; i>=0;i--) { |
| 131 | mac = (int)based_mac[i]; |
| 132 | mac += (add + carry); |
| 133 | add = 0; |
| 134 | if (mac > 255) { |
| 135 | carry = 1; |
| 136 | mac -= 256; |
| 137 | } else { |
| 138 | carry = 0; |
| 139 | } |
| 140 | mac_addr[i] = (char)mac; |
| 141 | } |
| 142 | } |
| 143 | //return node_id or -1 for error |
| 144 | int get_node_id_by_mac_address(unsigned char *target_mac_addr) { |
| 145 | char mac_addr[ETH_ALEN]; |
| 146 | int i; |
| 147 | for (i=0; i<MAX_SERVER_NODE; i++) { |
| 148 | get_mac_address_for_node_id(i, mac_addr); |
| 149 | if (0 == memcmp(target_mac_addr, mac_addr, ETH_ALEN)) |
| 150 | break; |
| 151 | } |
| 152 | if (i != MAX_SERVER_NODE) { |
| 153 | // int j; |
| 154 | // printf("mac_address for node[%d]:", i+1); |
| 155 | // for (j=0; j<6; j++) |
| 156 | // printf("%02x:", 0xff & mac_addr[j]); |
| 157 | // printf("\n"); |
| 158 | return i; |
| 159 | } else |
| 160 | return -1; |
| 161 | } |
| 162 | #if ENABLE_MONOTONIC_SYSCALL |
| 163 | #include <sys/syscall.h> |
| 164 | /* Old glibc (< 2.3.4) does not provide this constant. We use syscall |
| 165 | * directly so this definition is safe. */ |
| 166 | #ifndef CLOCK_MONOTONIC |
| 167 | #define CLOCK_MONOTONIC 1 |
| 168 | #endif |
| 169 | |
| 170 | unsigned FAST_FUNC monotonic_sec(void) |
| 171 | { |
| 172 | struct timespec ts; |
| 173 | get_mono(&ts); |
| 174 | return ts.tv_sec; |
| 175 | } |
| 176 | |
| 177 | #else |
| 178 | |
| 179 | unsigned monotonic_sec(void) |
| 180 | { |
| 181 | return time(NULL); |
| 182 | } |
| 183 | #endif |
| 184 | //query ip addr for server node w/ mac addr |
| 185 | //inarp "ethX" "peer mac addr(xx:xx:xx:xx:xx:xx)" |
| 186 | //inarp daemon to handle inarp packets |
| 187 | //inarp "ethX" "file for storing node list" |
| 188 | void InvARPServerTask( |
| 189 | /** the internal task ID of this task (in) */ |
| 190 | ULONG thread_input |
| 191 | ) |
| 192 | { |
| 193 | int fd, ret; |
| 194 | /*buffer for ethernet frame*/ |
| 195 | static unsigned char buffer[ETH_FRAME_LEN]; /* single packets are usually not bigger than 8192 bytes */ |
| 196 | int send_result = 0; |
| 197 | static struct ifreq ifreq_buffer; |
| 198 | |
| 199 | /*our MAC address*/ |
| 200 | static unsigned char src_mac[6]; |
| 201 | static unsigned char src_ip[4]; |
| 202 | int ifindex; |
| 203 | // int InARP_SERVER; |
| 204 | |
| 205 | if (((fd = socket (AF_PACKET, SOCK_PACKET, htons(ETH_P_ARP)))) == -1) { |
| 206 | // if (((fd = socket (AF_PACKET, SOCK_RAW, 0))) == -1) { |
| 207 | printf("socket: [%s]\n", strerror(errno)); |
| 208 | exit(-1); |
| 209 | } |
| 210 | //local mac address |
| 211 | memset(&ifreq_buffer, 0x00, sizeof(ifreq_buffer)); |
| 212 | strcpy(ifreq_buffer.ifr_name, "ncsi0"); |
| 213 | ret = ioctl(fd, SIOCGIFHWADDR, &ifreq_buffer); |
| 214 | if (ret == -1) { |
| 215 | printf("ioctl2: [%s]\n", strerror(errno)); |
| 216 | close(fd); |
| 217 | exit(-1); |
| 218 | } |
| 219 | memcpy(src_mac, ifreq_buffer.ifr_hwaddr.sa_data, ETH_ALEN); |
| 220 | show_mac_addr("ncsi0", src_mac); |
| 221 | //interface index |
| 222 | memset(&ifreq_buffer, 0x00, sizeof(ifreq_buffer)); |
| 223 | strcpy(ifreq_buffer.ifr_name, "ncsi0"); |
| 224 | ret = ioctl(fd, SIOCGIFINDEX, &ifreq_buffer); |
| 225 | if (ret == -1) { |
| 226 | printf("ioctl4: [%s]\n", strerror(errno)); |
| 227 | close(fd); |
| 228 | exit(-1); |
| 229 | } |
| 230 | ifindex = ifreq_buffer.ifr_ifindex; |
| 231 | |
| 232 | int length = 0; /*length of the received frame*/ |
| 233 | static struct ETH_ARP_PACKET *inarp_req = (struct ETH_ARP_PACKET *)buffer; /* single packets are usually not bigger than 8192 bytes */ |
| 234 | static struct ETH_ARP_PACKET inarp_resp; /* single packets are usually not bigger than 8192 bytes */ |
| 235 | static struct { |
| 236 | unsigned char dest_ip[4]; |
| 237 | struct timespec update_time; |
| 238 | } node[SKU1_MAX_SERVER_NODES]; |
| 239 | struct timespec current_time; |
| 240 | //argv[2]: file name used for storing node ip list |
| 241 | // line format in file: <node_id> <mac_addr> <ip_addr> |
| 242 | //get based address via EMS |
| 243 | //set socket as async |
| 244 | // fcntl(fd, F_SETFL,O_NONBLOCK|FASYNC); |
| 245 | //got based address |
| 246 | while (1) { |
| 247 | //get local ip address |
| 248 | memset(&ifreq_buffer, 0x00, sizeof(ifreq_buffer)); |
| 249 | strcpy(ifreq_buffer.ifr_name, "ncsi0"); |
| 250 | ret = ioctl(fd, SIOCGIFADDR, &ifreq_buffer); |
| 251 | if (ret == -1) { |
| 252 | // printf("ioctl3: [%s]\n", strerror(errno)); |
| 253 | sleep(1); |
| 254 | continue; |
| 255 | } |
| 256 | |
| 257 | if (AF_INET == ifreq_buffer.ifr_addr.sa_family) { |
| 258 | memcpy(src_ip, &ifreq_buffer.ifr_addr.sa_data[2], 4); |
| 259 | // show_ip_addr("local", (unsigned char *)&ifreq_buffer.ifr_addr.sa_data[2]); |
| 260 | //show_ip_addr("local", src_ip); |
| 261 | } else { |
| 262 | printf("unknown address family [%d]!\n", ifreq_buffer.ifr_addr.sa_family); |
| 263 | sleep(1); |
| 264 | continue; |
| 265 | } |
| 266 | |
| 267 | memset((void*)&inarp_resp, 0, sizeof inarp_resp); |
| 268 | length = recvfrom(fd, buffer, ETH_ARP_FRAME_LEN, 0, NULL, NULL); |
| 269 | if (length == -1) { |
| 270 | sleep(1); |
| 271 | } |
| 272 | // printf("length = %d\r\nfd = %d\r\n", length, fd); |
| 273 | current_time.tv_sec = (unsigned)monotonic_sec(); |
| 274 | if (0 == memcmp(src_mac, inarp_req->eh.h_dest, ETH_ALEN)) { |
| 275 | if (ntohs(inarp_req->arp.ar_op) == ARPOP_InREQUEST) { //get a inverse arp request |
| 276 | // printf("[Rsp] InRequest\n"); |
| 277 | //dump_data("got InARP request packet", buffer, length); |
| 278 | //send inarp response |
| 279 | |
| 280 | printf("src mac =%02x:%02x:%02x:%02x:%02x:%02x\r\n", |
| 281 | inarp_req->arp_data.src_mac[0], |
| 282 | inarp_req->arp_data.src_mac[1], |
| 283 | inarp_req->arp_data.src_mac[2], |
| 284 | inarp_req->arp_data.src_mac[3], |
| 285 | inarp_req->arp_data.src_mac[4], |
| 286 | inarp_req->arp_data.src_mac[5] |
| 287 | ); |
| 288 | printf("src ip =%d:%d:%d:%d\r\n", |
| 289 | inarp_req->arp_data.src_ip[0], |
| 290 | inarp_req->arp_data.src_ip[1], |
| 291 | inarp_req->arp_data.src_ip[2], |
| 292 | inarp_req->arp_data.src_ip[3] |
| 293 | ); |
| 294 | int fd_1; |
| 295 | if (((fd_1 = socket (AF_PACKET, SOCK_RAW, 0))) == -1) { |
| 296 | printf("socket: [%s]\n", strerror(errno)); |
| 297 | exit(-1); |
| 298 | } |
| 299 | send_result = send_arp_packet(fd_1, ifindex, &inarp_resp, ARPOP_InREPLY, |
| 300 | inarp_req->arp_data.dest_mac, src_ip, |
| 301 | inarp_req->arp_data.src_mac, inarp_req->arp_data.src_ip); |
| 302 | close(fd_1); |
| 303 | if (send_result == -1) { |
| 304 | printf("[Rsp] sendto: [%s]\n", strerror(errno)); |
| 305 | sleep(1); |
| 306 | continue; |
| 307 | } |
| 308 | } |
| 309 | // } else if (ntohs(inarp_req->arp.ar_op) == ARPOP_InREPLY) { //get a InARP Response |
| 310 | // int node_id; |
| 311 | // printf("[Rsp] InReply\n"); |
| 312 | // node_id = get_node_id_by_mac_address(inarp_req->arp_data.src_mac); |
| 313 | // if (node_id == -1) { |
| 314 | // //invalid node |
| 315 | // printf("%02x:%02x:%02x:%02x:%02x:%02x does not belong to this rack.", |
| 316 | // inarp_req->arp_data.src_mac[0], |
| 317 | // inarp_req->arp_data.src_mac[1], |
| 318 | // inarp_req->arp_data.src_mac[2], |
| 319 | // inarp_req->arp_data.src_mac[3], |
| 320 | // inarp_req->arp_data.src_mac[4], |
| 321 | // inarp_req->arp_data.src_mac[5] |
| 322 | // ); |
| 323 | // } else { |
| 324 | //valid node id |
| 325 | // node[node_id].update_time.tv_sec = current_time.tv_sec; |
| 326 | //update or remain node's ip |
| 327 | // if ((0 != memcmp(node[node_id].dest_ip, inarp_req->arp_data.src_ip, 4))) { |
| 328 | //ip address is changed. |
| 329 | // static char ipv4_addr[16]; |
| 330 | // printf("[Rsp] update node[%d] ip @ %u\n", node_id+1, (unsigned)current_time.tv_sec); |
| 331 | // show_mac_addr("[Rsp] ", inarp_req->arp_data.src_mac); |
| 332 | // show_ip_addr("[Rsp] ", inarp_req->arp_data.src_ip); |
| 333 | // memcpy(node[node_id].dest_ip, inarp_req->arp_data.src_ip, 4); |
| 334 | // sprintf(ipv4_addr, "%d.%d.%d.%d", |
| 335 | // inarp_req->arp_data.src_ip[0], |
| 336 | // inarp_req->arp_data.src_ip[1], |
| 337 | // inarp_req->arp_data.src_ip[2], |
| 338 | // inarp_req->arp_data.src_ip[3]); |
| 339 | // printf("[Rsp] update node[%d] ip @ %u\n", node_id+1, (unsigned)current_time.tv_sec); |
| 340 | // } |
| 341 | memset(buffer, 0, sizeof(buffer)); |
| 342 | } |
| 343 | } |
| 344 | close(fd); |
| 345 | return 0; |
| 346 | } |