Jakub Grajciar | 7c5c40d | 2017-08-30 10:13:25 +0200 | [diff] [blame] | 1 | /* |
| 2 | *------------------------------------------------------------------ |
| 3 | * Copyright (c) 2017 Cisco and/or its affiliates. |
| 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 | */ |
| 17 | |
| 18 | #define _GNU_SOURCE |
| 19 | #include <sys/socket.h> |
| 20 | #include <sys/types.h> |
| 21 | #include <sys/un.h> |
| 22 | #include <string.h> |
| 23 | #include <stdio.h> |
| 24 | #include <stdlib.h> |
| 25 | #include <net/if.h> |
| 26 | #include <sys/ioctl.h> |
| 27 | #include <sys/uio.h> |
| 28 | #include <sys/mman.h> |
| 29 | #include <sys/prctl.h> |
| 30 | #include <fcntl.h> |
| 31 | #include <errno.h> |
| 32 | |
| 33 | #include <socket.h> |
| 34 | #include <memif.h> |
Jakub Grajciar | ecfa2aa | 2018-03-26 11:26:34 +0200 | [diff] [blame^] | 35 | #include <memif_private.h> |
Jakub Grajciar | 7c5c40d | 2017-08-30 10:13:25 +0200 | [diff] [blame] | 36 | |
Jakub Grajciar | 7c5c40d | 2017-08-30 10:13:25 +0200 | [diff] [blame] | 37 | /* sends msg to socket */ |
| 38 | static_fn int |
| 39 | memif_msg_send (int fd, memif_msg_t * msg, int afd) |
| 40 | { |
| 41 | struct msghdr mh = { 0 }; |
| 42 | struct iovec iov[1]; |
| 43 | char ctl[CMSG_SPACE (sizeof (int))]; |
| 44 | int rv, err = MEMIF_ERR_SUCCESS; /* 0 */ |
| 45 | |
| 46 | iov[0].iov_base = (void *) msg; |
| 47 | iov[0].iov_len = sizeof (memif_msg_t); |
| 48 | mh.msg_iov = iov; |
| 49 | mh.msg_iovlen = 1; |
| 50 | |
| 51 | if (afd > 0) |
| 52 | { |
| 53 | struct cmsghdr *cmsg; |
| 54 | memset (&ctl, 0, sizeof (ctl)); |
| 55 | mh.msg_control = ctl; |
| 56 | mh.msg_controllen = sizeof (ctl); |
| 57 | cmsg = CMSG_FIRSTHDR (&mh); |
| 58 | cmsg->cmsg_len = CMSG_LEN (sizeof (int)); |
| 59 | cmsg->cmsg_level = SOL_SOCKET; |
| 60 | cmsg->cmsg_type = SCM_RIGHTS; |
| 61 | memcpy (CMSG_DATA (cmsg), &afd, sizeof (int)); |
| 62 | } |
| 63 | rv = sendmsg (fd, &mh, 0); |
| 64 | if (rv < 0) |
| 65 | err = memif_syscall_error_handler (errno); |
| 66 | DBG ("Message type %u sent", msg->type); |
| 67 | return err; |
| 68 | } |
| 69 | |
| 70 | /* response from memif master - master is ready to handle next message */ |
| 71 | static_fn int |
| 72 | memif_msg_enq_ack (memif_connection_t * c) |
| 73 | { |
Jakub Grajciar | ecfa2aa | 2018-03-26 11:26:34 +0200 | [diff] [blame^] | 74 | libmemif_main_t *lm = &libmemif_main; |
Jakub Grajciar | 7c5c40d | 2017-08-30 10:13:25 +0200 | [diff] [blame] | 75 | memif_msg_queue_elt_t *e = |
Jakub Grajciar | ecfa2aa | 2018-03-26 11:26:34 +0200 | [diff] [blame^] | 76 | (memif_msg_queue_elt_t *) lm->alloc (sizeof (memif_msg_queue_elt_t)); |
Jakub Grajciar | 7c5c40d | 2017-08-30 10:13:25 +0200 | [diff] [blame] | 77 | if (e == NULL) |
| 78 | return memif_syscall_error_handler (errno); |
| 79 | |
| 80 | memset (&e->msg, 0, sizeof (e->msg)); |
| 81 | e->msg.type = MEMIF_MSG_TYPE_ACK; |
| 82 | e->fd = -1; |
| 83 | |
| 84 | e->next = NULL; |
| 85 | if (c->msg_queue == NULL) |
| 86 | { |
| 87 | c->msg_queue = e; |
| 88 | return MEMIF_ERR_SUCCESS; /* 0 */ |
| 89 | } |
| 90 | |
| 91 | memif_msg_queue_elt_t *cur = c->msg_queue; |
| 92 | while (cur->next != NULL) |
| 93 | { |
| 94 | cur = cur->next; |
| 95 | } |
| 96 | cur->next = e; |
| 97 | |
| 98 | return MEMIF_ERR_SUCCESS; /* 0 */ |
| 99 | } |
| 100 | |
| 101 | static_fn int |
| 102 | memif_msg_send_hello (int fd) |
| 103 | { |
| 104 | libmemif_main_t *lm = &libmemif_main; |
| 105 | memif_msg_t msg = { 0 }; |
| 106 | memif_msg_hello_t *h = &msg.hello; |
| 107 | msg.type = MEMIF_MSG_TYPE_HELLO; |
| 108 | h->min_version = MEMIF_VERSION; |
| 109 | h->max_version = MEMIF_VERSION; |
| 110 | h->max_s2m_ring = MEMIF_MAX_M2S_RING; |
| 111 | h->max_m2s_ring = MEMIF_MAX_M2S_RING; |
| 112 | h->max_region = MEMIF_MAX_REGION; |
| 113 | h->max_log2_ring_size = MEMIF_MAX_LOG2_RING_SIZE; |
| 114 | |
| 115 | strncpy ((char *) h->name, lm->app_name, strlen (lm->app_name)); |
| 116 | |
| 117 | /* msg hello is not enqueued but sent directly, |
| 118 | because it is the first msg to be sent */ |
| 119 | return memif_msg_send (fd, &msg, -1); |
| 120 | } |
| 121 | |
| 122 | /* send id and secret (optional) for interface identification */ |
| 123 | static_fn int |
| 124 | memif_msg_enq_init (memif_connection_t * c) |
| 125 | { |
Jakub Grajciar | ecfa2aa | 2018-03-26 11:26:34 +0200 | [diff] [blame^] | 126 | libmemif_main_t *lm = &libmemif_main; |
Jakub Grajciar | 7c5c40d | 2017-08-30 10:13:25 +0200 | [diff] [blame] | 127 | memif_msg_queue_elt_t *e = |
Jakub Grajciar | ecfa2aa | 2018-03-26 11:26:34 +0200 | [diff] [blame^] | 128 | (memif_msg_queue_elt_t *) lm->alloc (sizeof (memif_msg_queue_elt_t)); |
Jakub Grajciar | 7c5c40d | 2017-08-30 10:13:25 +0200 | [diff] [blame] | 129 | if (e == NULL) |
| 130 | return memif_syscall_error_handler (errno); |
| 131 | memset (e, 0, sizeof (memif_msg_queue_elt_t)); |
| 132 | |
| 133 | memset (&e->msg, 0, sizeof (e->msg)); |
| 134 | memif_msg_init_t *i = &e->msg.init; |
| 135 | |
| 136 | e->msg.type = MEMIF_MSG_TYPE_INIT; |
| 137 | e->fd = -1; |
| 138 | i->version = MEMIF_VERSION; |
| 139 | i->id = c->args.interface_id; |
| 140 | i->mode = c->args.mode; |
| 141 | |
Jakub Grajciar | ecfa2aa | 2018-03-26 11:26:34 +0200 | [diff] [blame^] | 142 | strncpy ((char *) i->name, (char *) lm->app_name, |
| 143 | strlen ((char *) lm->app_name)); |
Jakub Grajciar | 7c5c40d | 2017-08-30 10:13:25 +0200 | [diff] [blame] | 144 | if (c->args.secret) |
| 145 | strncpy ((char *) i->secret, (char *) c->args.secret, sizeof (i->secret)); |
| 146 | |
| 147 | e->next = NULL; |
| 148 | if (c->msg_queue == NULL) |
| 149 | { |
| 150 | c->msg_queue = e; |
| 151 | return MEMIF_ERR_SUCCESS; /* 0 */ |
| 152 | } |
| 153 | |
| 154 | memif_msg_queue_elt_t *cur = c->msg_queue; |
| 155 | while (cur->next != NULL) |
| 156 | { |
| 157 | cur = cur->next; |
| 158 | } |
| 159 | cur->next = e; |
| 160 | |
| 161 | return MEMIF_ERR_SUCCESS; /* 0 */ |
| 162 | } |
| 163 | |
| 164 | /* send information about region specified by region_index */ |
| 165 | static_fn int |
| 166 | memif_msg_enq_add_region (memif_connection_t * c, uint8_t region_index) |
| 167 | { |
Jakub Grajciar | ecfa2aa | 2018-03-26 11:26:34 +0200 | [diff] [blame^] | 168 | libmemif_main_t *lm = &libmemif_main; |
Jakub Grajciar | 7c5c40d | 2017-08-30 10:13:25 +0200 | [diff] [blame] | 169 | /* maybe check if region is valid? */ |
| 170 | memif_region_t *mr = &c->regions[region_index]; |
| 171 | |
| 172 | memif_msg_queue_elt_t *e = |
Jakub Grajciar | ecfa2aa | 2018-03-26 11:26:34 +0200 | [diff] [blame^] | 173 | (memif_msg_queue_elt_t *) lm->alloc (sizeof (memif_msg_queue_elt_t)); |
Jakub Grajciar | 7c5c40d | 2017-08-30 10:13:25 +0200 | [diff] [blame] | 174 | if (e == NULL) |
| 175 | return memif_syscall_error_handler (errno); |
| 176 | |
| 177 | memset (&e->msg, 0, sizeof (e->msg)); |
| 178 | memif_msg_add_region_t *ar = &e->msg.add_region; |
| 179 | |
| 180 | e->msg.type = MEMIF_MSG_TYPE_ADD_REGION; |
| 181 | e->fd = mr->fd; |
| 182 | ar->index = region_index; |
| 183 | ar->size = mr->region_size; |
| 184 | |
| 185 | e->next = NULL; |
| 186 | if (c->msg_queue == NULL) |
| 187 | { |
| 188 | c->msg_queue = e; |
| 189 | return MEMIF_ERR_SUCCESS; /* 0 */ |
| 190 | } |
| 191 | |
| 192 | memif_msg_queue_elt_t *cur = c->msg_queue; |
| 193 | while (cur->next != NULL) |
| 194 | { |
| 195 | cur = cur->next; |
| 196 | } |
| 197 | cur->next = e; |
| 198 | |
| 199 | return MEMIF_ERR_SUCCESS; /* 0 */ |
| 200 | } |
| 201 | |
| 202 | /* send information about ring specified by direction (S2M | M2S) and index */ |
| 203 | static_fn int |
| 204 | memif_msg_enq_add_ring (memif_connection_t * c, uint8_t index, uint8_t dir) |
| 205 | { |
Jakub Grajciar | ecfa2aa | 2018-03-26 11:26:34 +0200 | [diff] [blame^] | 206 | libmemif_main_t *lm = &libmemif_main; |
Jakub Grajciar | 7c5c40d | 2017-08-30 10:13:25 +0200 | [diff] [blame] | 207 | memif_msg_queue_elt_t *e = |
Jakub Grajciar | ecfa2aa | 2018-03-26 11:26:34 +0200 | [diff] [blame^] | 208 | (memif_msg_queue_elt_t *) lm->alloc (sizeof (memif_msg_queue_elt_t)); |
Jakub Grajciar | 7c5c40d | 2017-08-30 10:13:25 +0200 | [diff] [blame] | 209 | if (e == NULL) |
| 210 | return memif_syscall_error_handler (errno); |
| 211 | |
| 212 | memset (&e->msg, 0, sizeof (e->msg)); |
| 213 | memif_msg_add_ring_t *ar = &e->msg.add_ring; |
| 214 | |
| 215 | e->msg.type = MEMIF_MSG_TYPE_ADD_RING; |
| 216 | |
| 217 | /* TODO: support multiple rings */ |
| 218 | memif_queue_t *mq; |
| 219 | if (dir == MEMIF_RING_M2S) |
| 220 | mq = &c->rx_queues[index]; |
| 221 | else |
| 222 | mq = &c->tx_queues[index]; |
| 223 | |
| 224 | e->fd = mq->int_fd; |
| 225 | ar->index = index; |
| 226 | ar->offset = mq->offset; |
| 227 | ar->region = mq->region; |
| 228 | ar->log2_ring_size = mq->log2_ring_size; |
| 229 | ar->flags = (dir == MEMIF_RING_S2M) ? MEMIF_MSG_ADD_RING_FLAG_S2M : 0; |
| 230 | |
| 231 | e->next = NULL; |
| 232 | if (c->msg_queue == NULL) |
| 233 | { |
| 234 | c->msg_queue = e; |
| 235 | return MEMIF_ERR_SUCCESS; /* 0 */ |
| 236 | } |
| 237 | |
| 238 | memif_msg_queue_elt_t *cur = c->msg_queue; |
| 239 | while (cur->next != NULL) |
| 240 | { |
| 241 | cur = cur->next; |
| 242 | } |
| 243 | cur->next = e; |
| 244 | |
| 245 | return MEMIF_ERR_SUCCESS; /* 0 */ |
| 246 | } |
| 247 | |
| 248 | /* used as connection request from slave */ |
| 249 | static_fn int |
| 250 | memif_msg_enq_connect (memif_connection_t * c) |
| 251 | { |
Jakub Grajciar | ecfa2aa | 2018-03-26 11:26:34 +0200 | [diff] [blame^] | 252 | libmemif_main_t *lm = &libmemif_main; |
Jakub Grajciar | 7c5c40d | 2017-08-30 10:13:25 +0200 | [diff] [blame] | 253 | memif_msg_queue_elt_t *e = |
Jakub Grajciar | ecfa2aa | 2018-03-26 11:26:34 +0200 | [diff] [blame^] | 254 | (memif_msg_queue_elt_t *) lm->alloc (sizeof (memif_msg_queue_elt_t)); |
Jakub Grajciar | 7c5c40d | 2017-08-30 10:13:25 +0200 | [diff] [blame] | 255 | if (e == NULL) |
| 256 | return memif_syscall_error_handler (errno); |
| 257 | |
| 258 | memset (&e->msg, 0, sizeof (e->msg)); |
| 259 | memif_msg_connect_t *cm = &e->msg.connect; |
| 260 | |
| 261 | e->msg.type = MEMIF_MSG_TYPE_CONNECT; |
| 262 | e->fd = -1; |
| 263 | strncpy ((char *) cm->if_name, (char *) c->args.interface_name, |
| 264 | strlen ((char *) c->args.interface_name)); |
| 265 | |
| 266 | e->next = NULL; |
| 267 | if (c->msg_queue == NULL) |
| 268 | { |
| 269 | c->msg_queue = e; |
| 270 | return MEMIF_ERR_SUCCESS; /* 0 */ |
| 271 | } |
| 272 | |
| 273 | memif_msg_queue_elt_t *cur = c->msg_queue; |
| 274 | while (cur->next != NULL) |
| 275 | { |
| 276 | cur = cur->next; |
| 277 | } |
| 278 | cur->next = e; |
| 279 | |
| 280 | return MEMIF_ERR_SUCCESS; /* 0 */ |
| 281 | } |
| 282 | |
| 283 | /* used as confirmation of connection by master */ |
| 284 | static_fn int |
| 285 | memif_msg_enq_connected (memif_connection_t * c) |
| 286 | { |
Jakub Grajciar | ecfa2aa | 2018-03-26 11:26:34 +0200 | [diff] [blame^] | 287 | libmemif_main_t *lm = &libmemif_main; |
Jakub Grajciar | 7c5c40d | 2017-08-30 10:13:25 +0200 | [diff] [blame] | 288 | memif_msg_queue_elt_t *e = |
Jakub Grajciar | ecfa2aa | 2018-03-26 11:26:34 +0200 | [diff] [blame^] | 289 | (memif_msg_queue_elt_t *) lm->alloc (sizeof (memif_msg_queue_elt_t)); |
Jakub Grajciar | 7c5c40d | 2017-08-30 10:13:25 +0200 | [diff] [blame] | 290 | if (e == NULL) |
| 291 | return memif_syscall_error_handler (errno); |
| 292 | |
| 293 | memset (&e->msg, 0, sizeof (e->msg)); |
| 294 | memif_msg_connected_t *cm = &e->msg.connected; |
| 295 | |
| 296 | e->msg.type = MEMIF_MSG_TYPE_CONNECTED; |
| 297 | e->fd = -1; |
| 298 | strncpy ((char *) cm->if_name, (char *) c->args.interface_name, |
| 299 | strlen ((char *) c->args.interface_name)); |
| 300 | |
| 301 | e->next = NULL; |
| 302 | if (c->msg_queue == NULL) |
| 303 | { |
| 304 | c->msg_queue = e; |
| 305 | return MEMIF_ERR_SUCCESS; /* 0 */ |
| 306 | } |
| 307 | |
| 308 | memif_msg_queue_elt_t *cur = c->msg_queue; |
| 309 | while (cur->next != NULL) |
| 310 | { |
| 311 | cur = cur->next; |
| 312 | } |
| 313 | cur->next = e; |
| 314 | |
| 315 | return MEMIF_ERR_SUCCESS; /* 0 */ |
| 316 | } |
| 317 | |
| 318 | /* immediately send disconnect msg */ |
| 319 | /* specifie protocol for disconnect msg err_code |
| 320 | so that it will be compatible with VPP? (header/doc) */ |
| 321 | int |
| 322 | memif_msg_send_disconnect (int fd, uint8_t * err_string, uint32_t err_code) |
| 323 | { |
| 324 | memif_msg_t msg = { 0 }; |
| 325 | memif_msg_disconnect_t *d = &msg.disconnect; |
| 326 | |
| 327 | msg.type = MEMIF_MSG_TYPE_DISCONNECT; |
| 328 | d->code = err_code; |
| 329 | uint16_t l = strlen ((char *) err_string); |
| 330 | if (l > 96) |
| 331 | { |
| 332 | DBG ("Disconnect string too long. Sending first 96 characters."); |
| 333 | l = 96; |
| 334 | } |
| 335 | strncpy ((char *) d->string, (char *) err_string, l); |
| 336 | |
| 337 | return memif_msg_send (fd, &msg, -1); |
| 338 | } |
| 339 | |
| 340 | static_fn int |
| 341 | memif_msg_receive_hello (memif_connection_t * c, memif_msg_t * msg) |
| 342 | { |
| 343 | memif_msg_hello_t *h = &msg->hello; |
| 344 | |
| 345 | if (msg->hello.min_version > MEMIF_VERSION || |
| 346 | msg->hello.max_version < MEMIF_VERSION) |
| 347 | { |
| 348 | DBG ("incompatible protocol version"); |
| 349 | return MEMIF_ERR_PROTO; |
| 350 | } |
| 351 | |
| 352 | c->run_args.num_s2m_rings = memif_min (h->max_s2m_ring + 1, |
| 353 | c->args.num_s2m_rings); |
| 354 | c->run_args.num_m2s_rings = memif_min (h->max_m2s_ring + 1, |
| 355 | c->args.num_m2s_rings); |
| 356 | c->run_args.log2_ring_size = memif_min (h->max_log2_ring_size, |
| 357 | c->args.log2_ring_size); |
| 358 | c->run_args.buffer_size = c->args.buffer_size; |
| 359 | strncpy ((char *) c->remote_name, (char *) h->name, |
| 360 | strlen ((char *) h->name)); |
| 361 | |
| 362 | return MEMIF_ERR_SUCCESS; /* 0 */ |
| 363 | } |
| 364 | |
| 365 | /* handle interface identification (id, secret (optional)) */ |
| 366 | static_fn int |
| 367 | memif_msg_receive_init (memif_socket_t * ms, int fd, memif_msg_t * msg) |
| 368 | { |
| 369 | memif_msg_init_t *i = &msg->init; |
| 370 | memif_list_elt_t *elt = NULL; |
| 371 | memif_list_elt_t elt2; |
| 372 | memif_connection_t *c = NULL; |
| 373 | libmemif_main_t *lm = &libmemif_main; |
| 374 | uint8_t err_string[96]; |
| 375 | memset (err_string, 0, sizeof (char) * 96); |
| 376 | int err = MEMIF_ERR_SUCCESS; /* 0 */ |
| 377 | int err_disc; |
| 378 | if (i->version != MEMIF_VERSION) |
| 379 | { |
| 380 | DBG ("MEMIF_VER_ERR"); |
| 381 | strncpy ((char *) err_string, MEMIF_VER_ERR, strlen (MEMIF_VER_ERR)); |
| 382 | err = MEMIF_ERR_PROTO; |
| 383 | goto error; |
| 384 | } |
| 385 | |
| 386 | get_list_elt (&elt, ms->interface_list, ms->interface_list_len, i->id); |
| 387 | if (elt == NULL) |
| 388 | { |
| 389 | DBG ("MEMIF_ID_ERR"); |
| 390 | strncpy ((char *) err_string, MEMIF_ID_ERR, strlen (MEMIF_ID_ERR)); |
| 391 | err = MEMIF_ERR_ID; |
| 392 | goto error; |
| 393 | } |
| 394 | |
| 395 | c = (memif_connection_t *) elt->data_struct; |
| 396 | |
| 397 | if (!(c->args.is_master)) |
| 398 | { |
| 399 | DBG ("MEMIF_SLAVE_ERR"); |
| 400 | strncpy ((char *) err_string, MEMIF_SLAVE_ERR, |
| 401 | strlen (MEMIF_SLAVE_ERR)); |
| 402 | err = MEMIF_ERR_ACCSLAVE; |
| 403 | goto error; |
| 404 | } |
| 405 | if (c->fd != -1) |
| 406 | { |
| 407 | DBG ("MEMIF_CONN_ERR"); |
| 408 | strncpy ((char *) err_string, MEMIF_CONN_ERR, strlen (MEMIF_CONN_ERR)); |
| 409 | err = MEMIF_ERR_ALRCONN; |
| 410 | goto error; |
| 411 | } |
| 412 | |
| 413 | c->fd = fd; |
| 414 | |
| 415 | if (i->mode != c->args.mode) |
| 416 | { |
| 417 | DBG ("MEMIF_MODE_ERR"); |
| 418 | strncpy ((char *) err_string, MEMIF_MODE_ERR, strlen (MEMIF_MODE_ERR)); |
| 419 | err = MEMIF_ERR_MODE; |
| 420 | goto error; |
| 421 | } |
| 422 | |
| 423 | strncpy ((char *) c->remote_name, (char *) i->name, |
| 424 | strlen ((char *) i->name)); |
| 425 | |
| 426 | if (c->args.secret) |
| 427 | { |
| 428 | int r; |
| 429 | if (i->secret) |
| 430 | { |
| 431 | if (strlen ((char *) c->args.secret) != strlen ((char *) i->secret)) |
| 432 | { |
| 433 | DBG ("MEMIF_SECRET_ERR"); |
| 434 | strncpy ((char *) err_string, |
| 435 | MEMIF_SECRET_ERR, strlen (MEMIF_SECRET_ERR)); |
| 436 | err = MEMIF_ERR_SECRET; |
| 437 | goto error; |
| 438 | } |
| 439 | r = strncmp ((char *) i->secret, (char *) c->args.secret, |
| 440 | strlen ((char *) c->args.secret)); |
| 441 | if (r != 0) |
| 442 | { |
| 443 | DBG ("MEMIF_SECRET_ERR"); |
| 444 | strncpy ((char *) err_string, |
| 445 | MEMIF_SECRET_ERR, strlen (MEMIF_SECRET_ERR)); |
| 446 | err = MEMIF_ERR_SECRET; |
| 447 | goto error; |
| 448 | } |
| 449 | } |
| 450 | else |
| 451 | { |
| 452 | DBG ("MEMIF_NOSECRET_ERR"); |
| 453 | strncpy ((char *) err_string, |
| 454 | MEMIF_NOSECRET_ERR, strlen (MEMIF_NOSECRET_ERR)); |
| 455 | err = MEMIF_ERR_NOSECRET; |
| 456 | goto error; |
| 457 | } |
| 458 | } |
| 459 | |
| 460 | c->read_fn = memif_conn_fd_read_ready; |
| 461 | c->write_fn = memif_conn_fd_write_ready; |
| 462 | c->error_fn = memif_conn_fd_error; |
| 463 | |
| 464 | elt2.key = c->fd; |
| 465 | elt2.data_struct = c; |
| 466 | |
| 467 | add_list_elt (&elt2, &lm->control_list, &lm->control_list_len); |
| 468 | free_list_elt (lm->pending_list, lm->pending_list_len, fd); |
| 469 | |
| 470 | return err; |
| 471 | |
| 472 | error: |
| 473 | memif_msg_send_disconnect (fd, err_string, 0); |
| 474 | lm->control_fd_update (fd, MEMIF_FD_EVENT_DEL); |
| 475 | free_list_elt (lm->pending_list, lm->pending_list_len, fd); |
| 476 | close (fd); |
| 477 | fd = -1; |
| 478 | return err; |
| 479 | } |
| 480 | |
| 481 | /* receive region information and add new region to connection (if possible) */ |
| 482 | static_fn int |
| 483 | memif_msg_receive_add_region (memif_connection_t * c, memif_msg_t * msg, |
| 484 | int fd) |
| 485 | { |
| 486 | memif_msg_add_region_t *ar = &msg->add_region; |
| 487 | memif_region_t *mr; |
| 488 | if (fd < 0) |
| 489 | return MEMIF_ERR_NO_SHMFD; |
| 490 | |
| 491 | if (ar->index > MEMIF_MAX_REGION) |
| 492 | return MEMIF_ERR_MAXREG; |
| 493 | |
| 494 | mr = |
| 495 | (memif_region_t *) realloc (c->regions, |
| 496 | sizeof (memif_region_t) * (ar->index + 1)); |
| 497 | if (mr == NULL) |
| 498 | return memif_syscall_error_handler (errno); |
| 499 | c->regions = mr; |
| 500 | c->regions[ar->index].fd = fd; |
| 501 | c->regions[ar->index].region_size = ar->size; |
| 502 | c->regions[ar->index].shm = NULL; |
| 503 | |
| 504 | return MEMIF_ERR_SUCCESS; /* 0 */ |
| 505 | } |
| 506 | |
| 507 | /* receive ring information and add new ring to connection queue |
| 508 | (based on direction S2M | M2S) */ |
| 509 | static_fn int |
| 510 | memif_msg_receive_add_ring (memif_connection_t * c, memif_msg_t * msg, int fd) |
| 511 | { |
| 512 | memif_msg_add_ring_t *ar = &msg->add_ring; |
| 513 | |
| 514 | memif_queue_t *mq; |
| 515 | |
| 516 | if (fd < 0) |
| 517 | return MEMIF_ERR_NO_INTFD; |
| 518 | |
| 519 | if (ar->flags & MEMIF_MSG_ADD_RING_FLAG_S2M) |
| 520 | { |
| 521 | if (ar->index > MEMIF_MAX_S2M_RING) |
| 522 | return MEMIF_ERR_MAXRING; |
| 523 | if (ar->index >= c->args.num_s2m_rings) |
| 524 | return MEMIF_ERR_MAXRING; |
| 525 | |
| 526 | mq = |
| 527 | (memif_queue_t *) realloc (c->rx_queues, |
| 528 | sizeof (memif_queue_t) * (ar->index + 1)); |
Jakub Grajciar | ecfa2aa | 2018-03-26 11:26:34 +0200 | [diff] [blame^] | 529 | memset (mq, 0, sizeof (memif_queue_t) * (ar->index + 1)); |
Jakub Grajciar | 7c5c40d | 2017-08-30 10:13:25 +0200 | [diff] [blame] | 530 | if (mq == NULL) |
| 531 | return memif_syscall_error_handler (errno); |
| 532 | c->rx_queues = mq; |
| 533 | c->rx_queues[ar->index].int_fd = fd; |
| 534 | c->rx_queues[ar->index].log2_ring_size = ar->log2_ring_size; |
| 535 | c->rx_queues[ar->index].region = ar->region; |
| 536 | c->rx_queues[ar->index].offset = ar->offset; |
| 537 | c->run_args.num_s2m_rings++; |
| 538 | } |
| 539 | else |
| 540 | { |
| 541 | if (ar->index > MEMIF_MAX_M2S_RING) |
| 542 | return MEMIF_ERR_MAXRING; |
| 543 | if (ar->index >= c->args.num_m2s_rings) |
| 544 | return MEMIF_ERR_MAXRING; |
| 545 | |
| 546 | mq = |
| 547 | (memif_queue_t *) realloc (c->tx_queues, |
| 548 | sizeof (memif_queue_t) * (ar->index + 1)); |
Jakub Grajciar | ecfa2aa | 2018-03-26 11:26:34 +0200 | [diff] [blame^] | 549 | memset (mq, 0, sizeof (memif_queue_t) * (ar->index + 1)); |
Jakub Grajciar | 7c5c40d | 2017-08-30 10:13:25 +0200 | [diff] [blame] | 550 | if (mq == NULL) |
| 551 | return memif_syscall_error_handler (errno); |
| 552 | c->tx_queues = mq; |
| 553 | c->tx_queues[ar->index].int_fd = fd; |
| 554 | c->tx_queues[ar->index].log2_ring_size = ar->log2_ring_size; |
| 555 | c->tx_queues[ar->index].region = ar->region; |
| 556 | c->tx_queues[ar->index].offset = ar->offset; |
| 557 | c->run_args.num_m2s_rings++; |
| 558 | } |
| 559 | |
| 560 | return MEMIF_ERR_SUCCESS; /* 0 */ |
| 561 | } |
| 562 | |
| 563 | /* slave -> master */ |
| 564 | static_fn int |
| 565 | memif_msg_receive_connect (memif_connection_t * c, memif_msg_t * msg) |
| 566 | { |
| 567 | memif_msg_connect_t *cm = &msg->connect; |
| 568 | libmemif_main_t *lm = &libmemif_main; |
| 569 | memif_list_elt_t elt; |
| 570 | |
| 571 | int err; |
| 572 | err = memif_connect1 (c); |
| 573 | if (err != MEMIF_ERR_SUCCESS) |
| 574 | return err; |
| 575 | |
| 576 | strncpy ((char *) c->remote_if_name, (char *) cm->if_name, |
| 577 | strlen ((char *) cm->if_name)); |
| 578 | |
| 579 | int i; |
| 580 | if (c->on_interrupt != NULL) |
| 581 | { |
| 582 | for (i = 0; i < c->run_args.num_m2s_rings; i++) |
| 583 | { |
| 584 | elt.key = c->rx_queues[i].int_fd; |
| 585 | elt.data_struct = c; |
| 586 | add_list_elt (&elt, &lm->interrupt_list, &lm->interrupt_list_len); |
| 587 | |
| 588 | lm->control_fd_update (c->rx_queues[i].int_fd, MEMIF_FD_EVENT_READ); |
Jakub Grajciar | ecfa2aa | 2018-03-26 11:26:34 +0200 | [diff] [blame^] | 589 | |
| 590 | /* refill ring buffers */ |
| 591 | memif_refill_queue ((void *) c, i, -1); |
Jakub Grajciar | 7c5c40d | 2017-08-30 10:13:25 +0200 | [diff] [blame] | 592 | } |
| 593 | |
| 594 | } |
| 595 | |
| 596 | c->on_connect ((void *) c, c->private_ctx); |
| 597 | |
| 598 | return err; |
| 599 | } |
| 600 | |
| 601 | /* master -> slave */ |
| 602 | static_fn int |
| 603 | memif_msg_receive_connected (memif_connection_t * c, memif_msg_t * msg) |
| 604 | { |
| 605 | memif_msg_connect_t *cm = &msg->connect; |
| 606 | libmemif_main_t *lm = &libmemif_main; |
| 607 | |
| 608 | int err; |
| 609 | err = memif_connect1 (c); |
| 610 | if (err != MEMIF_ERR_SUCCESS) |
| 611 | return err; |
| 612 | |
| 613 | strncpy ((char *) c->remote_if_name, (char *) cm->if_name, |
| 614 | strlen ((char *) cm->if_name)); |
| 615 | |
| 616 | int i; |
| 617 | if (c->on_interrupt != NULL) |
| 618 | { |
| 619 | for (i = 0; i < c->run_args.num_s2m_rings; i++) |
Jakub Grajciar | ecfa2aa | 2018-03-26 11:26:34 +0200 | [diff] [blame^] | 620 | { |
| 621 | lm->control_fd_update (c->rx_queues[i].int_fd, MEMIF_FD_EVENT_READ); |
| 622 | |
| 623 | /* refill ring buffers */ |
| 624 | memif_refill_queue ((void *) c, i, -1); |
| 625 | } |
Jakub Grajciar | 7c5c40d | 2017-08-30 10:13:25 +0200 | [diff] [blame] | 626 | } |
| 627 | |
| 628 | c->on_connect ((void *) c, c->private_ctx); |
| 629 | |
| 630 | return err; |
| 631 | } |
| 632 | |
| 633 | static_fn int |
| 634 | memif_msg_receive_disconnect (memif_connection_t * c, memif_msg_t * msg) |
| 635 | { |
| 636 | memif_msg_disconnect_t *d = &msg->disconnect; |
| 637 | |
| 638 | memset (c->remote_disconnect_string, 0, |
| 639 | sizeof (c->remote_disconnect_string)); |
| 640 | strncpy ((char *) c->remote_disconnect_string, (char *) d->string, |
| 641 | strlen ((char *) d->string)); |
| 642 | |
| 643 | /* on returning error, handle function will call memif_disconnect () */ |
| 644 | DBG ("disconnect received: %s, mode: %d", |
| 645 | c->remote_disconnect_string, c->args.mode); |
| 646 | return MEMIF_ERR_DISCONNECT; |
| 647 | } |
| 648 | |
| 649 | static_fn int |
| 650 | memif_msg_receive (int ifd) |
| 651 | { |
| 652 | char ctl[CMSG_SPACE (sizeof (int)) + |
| 653 | CMSG_SPACE (sizeof (struct ucred))] = { 0 }; |
| 654 | struct msghdr mh = { 0 }; |
| 655 | struct iovec iov[1]; |
| 656 | memif_msg_t msg = { 0 }; |
| 657 | ssize_t size; |
| 658 | int err = MEMIF_ERR_SUCCESS; /* 0 */ |
| 659 | int fd = -1; |
| 660 | int i; |
| 661 | libmemif_main_t *lm = &libmemif_main; |
| 662 | memif_connection_t *c = NULL; |
| 663 | memif_socket_t *ms = NULL; |
| 664 | memif_list_elt_t *elt = NULL; |
| 665 | |
| 666 | iov[0].iov_base = (void *) &msg; |
| 667 | iov[0].iov_len = sizeof (memif_msg_t); |
| 668 | mh.msg_iov = iov; |
| 669 | mh.msg_iovlen = 1; |
| 670 | mh.msg_control = ctl; |
| 671 | mh.msg_controllen = sizeof (ctl); |
| 672 | |
| 673 | DBG ("recvmsg fd %d", ifd); |
| 674 | size = recvmsg (ifd, &mh, 0); |
| 675 | DBG ("done"); |
| 676 | if (size != sizeof (memif_msg_t)) |
| 677 | { |
| 678 | if (size == 0) |
| 679 | return MEMIF_ERR_DISCONNECTED; |
| 680 | else |
| 681 | return MEMIF_ERR_MFMSG; |
| 682 | } |
| 683 | |
| 684 | struct ucred *cr = 0; |
| 685 | struct cmsghdr *cmsg; |
| 686 | |
| 687 | cmsg = CMSG_FIRSTHDR (&mh); |
| 688 | while (cmsg) |
| 689 | { |
| 690 | if (cmsg->cmsg_level == SOL_SOCKET) |
| 691 | { |
| 692 | if (cmsg->cmsg_type == SCM_CREDENTIALS) |
| 693 | { |
| 694 | cr = (struct ucred *) CMSG_DATA (cmsg); |
| 695 | } |
| 696 | else if (cmsg->cmsg_type == SCM_RIGHTS) |
| 697 | { |
| 698 | int *fdp = (int *) CMSG_DATA (cmsg); |
| 699 | fd = *fdp; |
| 700 | } |
| 701 | } |
| 702 | cmsg = CMSG_NXTHDR (&mh, cmsg); |
| 703 | } |
| 704 | |
| 705 | DBG ("Message type %u received", msg.type); |
| 706 | |
| 707 | get_list_elt (&elt, lm->control_list, lm->control_list_len, ifd); |
| 708 | if (elt != NULL) |
| 709 | c = (memif_connection_t *) elt->data_struct; |
| 710 | |
| 711 | switch (msg.type) |
| 712 | { |
| 713 | case MEMIF_MSG_TYPE_ACK: |
| 714 | break; |
| 715 | |
| 716 | case MEMIF_MSG_TYPE_HELLO: |
| 717 | if ((err = memif_msg_receive_hello (c, &msg)) != MEMIF_ERR_SUCCESS) |
| 718 | return err; |
| 719 | if ((err = memif_init_regions_and_queues (c)) != MEMIF_ERR_SUCCESS) |
| 720 | return err; |
| 721 | if ((err = memif_msg_enq_init (c)) != MEMIF_ERR_SUCCESS) |
| 722 | return err; |
| 723 | if ((err = memif_msg_enq_add_region (c, 0)) != MEMIF_ERR_SUCCESS) |
| 724 | return err; |
| 725 | for (i = 0; i < c->run_args.num_s2m_rings; i++) |
| 726 | { |
| 727 | if ((err = |
| 728 | memif_msg_enq_add_ring (c, i, |
| 729 | MEMIF_RING_S2M)) != MEMIF_ERR_SUCCESS) |
| 730 | return err; |
| 731 | } |
| 732 | for (i = 0; i < c->run_args.num_m2s_rings; i++) |
| 733 | { |
| 734 | if ((err = |
| 735 | memif_msg_enq_add_ring (c, i, |
| 736 | MEMIF_RING_M2S)) != MEMIF_ERR_SUCCESS) |
| 737 | return err; |
| 738 | } |
| 739 | if ((err = memif_msg_enq_connect (c)) != MEMIF_ERR_SUCCESS) |
| 740 | return err; |
| 741 | break; |
| 742 | |
| 743 | case MEMIF_MSG_TYPE_INIT: |
| 744 | get_list_elt (&elt, lm->pending_list, lm->pending_list_len, ifd); |
| 745 | if (elt == NULL) |
| 746 | return -1; |
| 747 | ms = (memif_socket_t *) elt->data_struct; |
| 748 | if ((err = memif_msg_receive_init (ms, ifd, &msg)) != MEMIF_ERR_SUCCESS) |
| 749 | return err; |
| 750 | /* c->remote_pid = cr->pid */ |
| 751 | /* c->remote_uid = cr->uid */ |
| 752 | /* c->remote_gid = cr->gid */ |
| 753 | get_list_elt (&elt, lm->control_list, lm->control_list_len, ifd); |
| 754 | if (elt == NULL) |
| 755 | return -1; |
| 756 | c = (memif_connection_t *) elt->data_struct; |
| 757 | if ((err = memif_msg_enq_ack (c)) != MEMIF_ERR_SUCCESS) |
| 758 | return err; |
| 759 | break; |
| 760 | |
| 761 | case MEMIF_MSG_TYPE_ADD_REGION: |
| 762 | if ((err = |
| 763 | memif_msg_receive_add_region (c, &msg, fd)) != MEMIF_ERR_SUCCESS) |
| 764 | return err; |
| 765 | if ((err = memif_msg_enq_ack (c)) != MEMIF_ERR_SUCCESS) |
| 766 | return err; |
| 767 | break; |
| 768 | |
| 769 | case MEMIF_MSG_TYPE_ADD_RING: |
| 770 | if ((err = |
| 771 | memif_msg_receive_add_ring (c, &msg, fd)) != MEMIF_ERR_SUCCESS) |
| 772 | return err; |
| 773 | if ((err = memif_msg_enq_ack (c)) != MEMIF_ERR_SUCCESS) |
| 774 | return err; |
| 775 | break; |
| 776 | |
| 777 | case MEMIF_MSG_TYPE_CONNECT: |
| 778 | if ((err = memif_msg_receive_connect (c, &msg)) != MEMIF_ERR_SUCCESS) |
| 779 | return err; |
| 780 | if ((err = memif_msg_enq_connected (c)) != MEMIF_ERR_SUCCESS) |
| 781 | return err; |
| 782 | break; |
| 783 | |
| 784 | case MEMIF_MSG_TYPE_CONNECTED: |
| 785 | if ((err = memif_msg_receive_connected (c, &msg)) != MEMIF_ERR_SUCCESS) |
| 786 | return err; |
| 787 | break; |
| 788 | |
| 789 | case MEMIF_MSG_TYPE_DISCONNECT: |
| 790 | if ((err = memif_msg_receive_disconnect (c, &msg)) != MEMIF_ERR_SUCCESS) |
| 791 | return err; |
| 792 | break; |
| 793 | |
| 794 | default: |
| 795 | return MEMIF_ERR_UNKNOWN_MSG;; |
| 796 | break; |
| 797 | } |
| 798 | |
| 799 | if (c != NULL) |
| 800 | c->flags |= MEMIF_CONNECTION_FLAG_WRITE; |
| 801 | /* libmemif_main_t *lm = &libmemif_main; |
| 802 | lm->control_fd_update (c->fd, MEMIF_FD_EVENT_READ | MEMIF_FD_EVENT_MOD); */ |
| 803 | return MEMIF_ERR_SUCCESS; /* 0 */ |
| 804 | } |
| 805 | |
| 806 | int |
| 807 | memif_conn_fd_error (memif_connection_t * c) |
| 808 | { |
| 809 | DBG ("connection fd error"); |
| 810 | strncpy ((char *) c->remote_disconnect_string, "connection fd error", 19); |
| 811 | int err = memif_disconnect_internal (c); |
| 812 | return err; |
| 813 | } |
| 814 | |
| 815 | /* calls memif_msg_receive to handle pending messages on socket */ |
| 816 | int |
| 817 | memif_conn_fd_read_ready (memif_connection_t * c) |
| 818 | { |
| 819 | int err; |
| 820 | err = memif_msg_receive (c->fd); |
| 821 | if (err != 0) |
| 822 | { |
| 823 | err = memif_disconnect_internal (c); |
| 824 | } |
| 825 | return err; |
| 826 | } |
| 827 | |
| 828 | /* get msg from msg queue buffer and send it to socket */ |
| 829 | int |
| 830 | memif_conn_fd_write_ready (memif_connection_t * c) |
| 831 | { |
Jakub Grajciar | ecfa2aa | 2018-03-26 11:26:34 +0200 | [diff] [blame^] | 832 | libmemif_main_t *lm = &libmemif_main; |
Jakub Grajciar | 7c5c40d | 2017-08-30 10:13:25 +0200 | [diff] [blame] | 833 | int err = MEMIF_ERR_SUCCESS; /* 0 */ |
| 834 | |
| 835 | |
| 836 | if ((c->flags & MEMIF_CONNECTION_FLAG_WRITE) == 0) |
| 837 | goto done; |
| 838 | |
| 839 | memif_msg_queue_elt_t *e = c->msg_queue; |
| 840 | if (e == NULL) |
| 841 | goto done; |
| 842 | |
| 843 | c->msg_queue = c->msg_queue->next; |
| 844 | |
| 845 | c->flags &= ~MEMIF_CONNECTION_FLAG_WRITE; |
| 846 | /* |
| 847 | libmemif_main_t *lm = &libmemif_main; |
| 848 | |
| 849 | lm->control_fd_update (c->fd, |
| 850 | MEMIF_FD_EVENT_READ | MEMIF_FD_EVENT_WRITE | MEMIF_FD_EVENT_MOD); |
| 851 | */ |
| 852 | err = memif_msg_send (c->fd, &e->msg, e->fd); |
Jakub Grajciar | ecfa2aa | 2018-03-26 11:26:34 +0200 | [diff] [blame^] | 853 | lm->free (e); |
Jakub Grajciar | 7c5c40d | 2017-08-30 10:13:25 +0200 | [diff] [blame] | 854 | goto done; |
| 855 | |
| 856 | done: |
| 857 | return err; |
| 858 | } |
| 859 | |
| 860 | int |
| 861 | memif_conn_fd_accept_ready (memif_socket_t * ms) |
| 862 | { |
| 863 | int addr_len; |
| 864 | struct sockaddr_un client; |
| 865 | int conn_fd; |
| 866 | libmemif_main_t *lm = &libmemif_main; |
| 867 | |
| 868 | DBG ("accept called"); |
| 869 | |
| 870 | addr_len = sizeof (client); |
| 871 | conn_fd = |
| 872 | accept (ms->fd, (struct sockaddr *) &client, (socklen_t *) & addr_len); |
| 873 | |
| 874 | if (conn_fd < 0) |
| 875 | { |
| 876 | return memif_syscall_error_handler (errno); |
| 877 | } |
| 878 | DBG ("accept fd %d", ms->fd); |
| 879 | DBG ("conn fd %d", conn_fd); |
| 880 | |
| 881 | memif_list_elt_t elt; |
| 882 | elt.key = conn_fd; |
| 883 | elt.data_struct = ms; |
| 884 | |
| 885 | add_list_elt (&elt, &lm->pending_list, &lm->pending_list_len); |
| 886 | lm->control_fd_update (conn_fd, MEMIF_FD_EVENT_READ | MEMIF_FD_EVENT_WRITE); |
| 887 | |
| 888 | return memif_msg_send_hello (conn_fd); |
| 889 | } |
| 890 | |
| 891 | int |
| 892 | memif_read_ready (int fd) |
| 893 | { |
| 894 | int err; |
| 895 | DBG ("call recv"); |
| 896 | err = memif_msg_receive (fd); |
| 897 | DBG ("recv finished"); |
| 898 | return err; |
| 899 | } |