| 1 | // SPDX-License-Identifier: GPL-2.0 |
| 2 | /* |
| 3 | * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) |
| 4 | * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) and |
| 5 | * James Leu (jleu@mindspring.net). |
| 6 | * Copyright (C) 2001 by various other people who didn't put their name here. |
| 7 | */ |
| 8 | |
| 9 | #include <linux/memblock.h> |
| 10 | #include <linux/etherdevice.h> |
| 11 | #include <linux/ethtool.h> |
| 12 | #include <linux/inetdevice.h> |
| 13 | #include <linux/init.h> |
| 14 | #include <linux/list.h> |
| 15 | #include <linux/netdevice.h> |
| 16 | #include <linux/platform_device.h> |
| 17 | #include <linux/rtnetlink.h> |
| 18 | #include <linux/skbuff.h> |
| 19 | #include <linux/slab.h> |
| 20 | #include <linux/spinlock.h> |
| 21 | #include <init.h> |
| 22 | #include <irq_kern.h> |
| 23 | #include <irq_user.h> |
| 24 | #include "mconsole_kern.h" |
| 25 | #include <net_kern.h> |
| 26 | #include <net_user.h> |
| 27 | |
| 28 | #define DRIVER_NAME "uml-netdev" |
| 29 | |
| 30 | static DEFINE_SPINLOCK(opened_lock); |
| 31 | static LIST_HEAD(opened); |
| 32 | |
| 33 | /* |
| 34 | * The drop_skb is used when we can't allocate an skb. The |
| 35 | * packet is read into drop_skb in order to get the data off the |
| 36 | * connection to the host. |
| 37 | * It is reallocated whenever a maximum packet size is seen which is |
| 38 | * larger than any seen before. update_drop_skb is called from |
| 39 | * eth_configure when a new interface is added. |
| 40 | */ |
| 41 | static DEFINE_SPINLOCK(drop_lock); |
| 42 | static struct sk_buff *drop_skb; |
| 43 | static int drop_max; |
| 44 | |
| 45 | static int update_drop_skb(int max) |
| 46 | { |
| 47 | struct sk_buff *new; |
| 48 | unsigned long flags; |
| 49 | int err = 0; |
| 50 | |
| 51 | spin_lock_irqsave(&drop_lock, flags); |
| 52 | |
| 53 | if (max <= drop_max) |
| 54 | goto out; |
| 55 | |
| 56 | err = -ENOMEM; |
| 57 | new = dev_alloc_skb(max); |
| 58 | if (new == NULL) |
| 59 | goto out; |
| 60 | |
| 61 | skb_put(new, max); |
| 62 | |
| 63 | kfree_skb(drop_skb); |
| 64 | drop_skb = new; |
| 65 | drop_max = max; |
| 66 | err = 0; |
| 67 | out: |
| 68 | spin_unlock_irqrestore(&drop_lock, flags); |
| 69 | |
| 70 | return err; |
| 71 | } |
| 72 | |
| 73 | static int uml_net_rx(struct net_device *dev) |
| 74 | { |
| 75 | struct uml_net_private *lp = netdev_priv(dev); |
| 76 | int pkt_len; |
| 77 | struct sk_buff *skb; |
| 78 | |
| 79 | /* If we can't allocate memory, try again next round. */ |
| 80 | skb = dev_alloc_skb(lp->max_packet); |
| 81 | if (skb == NULL) { |
| 82 | drop_skb->dev = dev; |
| 83 | /* Read a packet into drop_skb and don't do anything with it. */ |
| 84 | (*lp->read)(lp->fd, drop_skb, lp); |
| 85 | dev->stats.rx_dropped++; |
| 86 | return 0; |
| 87 | } |
| 88 | |
| 89 | skb->dev = dev; |
| 90 | skb_put(skb, lp->max_packet); |
| 91 | skb_reset_mac_header(skb); |
| 92 | pkt_len = (*lp->read)(lp->fd, skb, lp); |
| 93 | |
| 94 | if (pkt_len > 0) { |
| 95 | skb_trim(skb, pkt_len); |
| 96 | skb->protocol = (*lp->protocol)(skb); |
| 97 | |
| 98 | dev->stats.rx_bytes += skb->len; |
| 99 | dev->stats.rx_packets++; |
| 100 | netif_rx(skb); |
| 101 | return pkt_len; |
| 102 | } |
| 103 | |
| 104 | kfree_skb(skb); |
| 105 | return pkt_len; |
| 106 | } |
| 107 | |
| 108 | static void uml_dev_close(struct work_struct *work) |
| 109 | { |
| 110 | struct uml_net_private *lp = |
| 111 | container_of(work, struct uml_net_private, work); |
| 112 | dev_close(lp->dev); |
| 113 | } |
| 114 | |
| 115 | static irqreturn_t uml_net_interrupt(int irq, void *dev_id) |
| 116 | { |
| 117 | struct net_device *dev = dev_id; |
| 118 | struct uml_net_private *lp = netdev_priv(dev); |
| 119 | int err; |
| 120 | |
| 121 | if (!netif_running(dev)) |
| 122 | return IRQ_NONE; |
| 123 | |
| 124 | spin_lock(&lp->lock); |
| 125 | while ((err = uml_net_rx(dev)) > 0) ; |
| 126 | if (err < 0) { |
| 127 | printk(KERN_ERR |
| 128 | "Device '%s' read returned %d, shutting it down\n", |
| 129 | dev->name, err); |
| 130 | /* dev_close can't be called in interrupt context, and takes |
| 131 | * again lp->lock. |
| 132 | * And dev_close() can be safely called multiple times on the |
| 133 | * same device, since it tests for (dev->flags & IFF_UP). So |
| 134 | * there's no harm in delaying the device shutdown. |
| 135 | * Furthermore, the workqueue will not re-enqueue an already |
| 136 | * enqueued work item. */ |
| 137 | schedule_work(&lp->work); |
| 138 | goto out; |
| 139 | } |
| 140 | out: |
| 141 | spin_unlock(&lp->lock); |
| 142 | return IRQ_HANDLED; |
| 143 | } |
| 144 | |
| 145 | static int uml_net_open(struct net_device *dev) |
| 146 | { |
| 147 | struct uml_net_private *lp = netdev_priv(dev); |
| 148 | int err; |
| 149 | |
| 150 | if (lp->fd >= 0) { |
| 151 | err = -ENXIO; |
| 152 | goto out; |
| 153 | } |
| 154 | |
| 155 | lp->fd = (*lp->open)(&lp->user); |
| 156 | if (lp->fd < 0) { |
| 157 | err = lp->fd; |
| 158 | goto out; |
| 159 | } |
| 160 | |
| 161 | err = um_request_irq(dev->irq, lp->fd, IRQ_READ, uml_net_interrupt, |
| 162 | IRQF_SHARED, dev->name, dev); |
| 163 | if (err < 0) { |
| 164 | printk(KERN_ERR "uml_net_open: failed to get irq(%d)\n", err); |
| 165 | err = -ENETUNREACH; |
| 166 | goto out_close; |
| 167 | } |
| 168 | |
| 169 | netif_start_queue(dev); |
| 170 | |
| 171 | /* clear buffer - it can happen that the host side of the interface |
| 172 | * is full when we get here. In this case, new data is never queued, |
| 173 | * SIGIOs never arrive, and the net never works. |
| 174 | */ |
| 175 | while ((err = uml_net_rx(dev)) > 0) ; |
| 176 | |
| 177 | spin_lock(&opened_lock); |
| 178 | list_add(&lp->list, &opened); |
| 179 | spin_unlock(&opened_lock); |
| 180 | |
| 181 | return 0; |
| 182 | out_close: |
| 183 | if (lp->close != NULL) (*lp->close)(lp->fd, &lp->user); |
| 184 | lp->fd = -1; |
| 185 | out: |
| 186 | return err; |
| 187 | } |
| 188 | |
| 189 | static int uml_net_close(struct net_device *dev) |
| 190 | { |
| 191 | struct uml_net_private *lp = netdev_priv(dev); |
| 192 | |
| 193 | netif_stop_queue(dev); |
| 194 | |
| 195 | um_free_irq(dev->irq, dev); |
| 196 | if (lp->close != NULL) |
| 197 | (*lp->close)(lp->fd, &lp->user); |
| 198 | lp->fd = -1; |
| 199 | |
| 200 | spin_lock(&opened_lock); |
| 201 | list_del(&lp->list); |
| 202 | spin_unlock(&opened_lock); |
| 203 | |
| 204 | return 0; |
| 205 | } |
| 206 | |
| 207 | static netdev_tx_t uml_net_start_xmit(struct sk_buff *skb, struct net_device *dev) |
| 208 | { |
| 209 | struct uml_net_private *lp = netdev_priv(dev); |
| 210 | unsigned long flags; |
| 211 | int len; |
| 212 | |
| 213 | netif_stop_queue(dev); |
| 214 | |
| 215 | spin_lock_irqsave(&lp->lock, flags); |
| 216 | |
| 217 | len = (*lp->write)(lp->fd, skb, lp); |
| 218 | skb_tx_timestamp(skb); |
| 219 | |
| 220 | if (len == skb->len) { |
| 221 | dev->stats.tx_packets++; |
| 222 | dev->stats.tx_bytes += skb->len; |
| 223 | netif_trans_update(dev); |
| 224 | netif_start_queue(dev); |
| 225 | |
| 226 | /* this is normally done in the interrupt when tx finishes */ |
| 227 | netif_wake_queue(dev); |
| 228 | } |
| 229 | else if (len == 0) { |
| 230 | netif_start_queue(dev); |
| 231 | dev->stats.tx_dropped++; |
| 232 | } |
| 233 | else { |
| 234 | netif_start_queue(dev); |
| 235 | printk(KERN_ERR "uml_net_start_xmit: failed(%d)\n", len); |
| 236 | } |
| 237 | |
| 238 | spin_unlock_irqrestore(&lp->lock, flags); |
| 239 | |
| 240 | dev_consume_skb_any(skb); |
| 241 | |
| 242 | return NETDEV_TX_OK; |
| 243 | } |
| 244 | |
| 245 | static void uml_net_set_multicast_list(struct net_device *dev) |
| 246 | { |
| 247 | return; |
| 248 | } |
| 249 | |
| 250 | static void uml_net_tx_timeout(struct net_device *dev, unsigned int txqueue) |
| 251 | { |
| 252 | netif_trans_update(dev); |
| 253 | netif_wake_queue(dev); |
| 254 | } |
| 255 | |
| 256 | #ifdef CONFIG_NET_POLL_CONTROLLER |
| 257 | static void uml_net_poll_controller(struct net_device *dev) |
| 258 | { |
| 259 | disable_irq(dev->irq); |
| 260 | uml_net_interrupt(dev->irq, dev); |
| 261 | enable_irq(dev->irq); |
| 262 | } |
| 263 | #endif |
| 264 | |
| 265 | static void uml_net_get_drvinfo(struct net_device *dev, |
| 266 | struct ethtool_drvinfo *info) |
| 267 | { |
| 268 | strscpy(info->driver, DRIVER_NAME); |
| 269 | } |
| 270 | |
| 271 | static const struct ethtool_ops uml_net_ethtool_ops = { |
| 272 | .get_drvinfo = uml_net_get_drvinfo, |
| 273 | .get_link = ethtool_op_get_link, |
| 274 | .get_ts_info = ethtool_op_get_ts_info, |
| 275 | }; |
| 276 | |
| 277 | void uml_net_setup_etheraddr(struct net_device *dev, char *str) |
| 278 | { |
| 279 | u8 addr[ETH_ALEN]; |
| 280 | char *end; |
| 281 | int i; |
| 282 | |
| 283 | if (str == NULL) |
| 284 | goto random; |
| 285 | |
| 286 | for (i = 0; i < 6; i++) { |
| 287 | addr[i] = simple_strtoul(str, &end, 16); |
| 288 | if ((end == str) || |
| 289 | ((*end != ':') && (*end != ',') && (*end != '\0'))) { |
| 290 | printk(KERN_ERR |
| 291 | "setup_etheraddr: failed to parse '%s' " |
| 292 | "as an ethernet address\n", str); |
| 293 | goto random; |
| 294 | } |
| 295 | str = end + 1; |
| 296 | } |
| 297 | if (is_multicast_ether_addr(addr)) { |
| 298 | printk(KERN_ERR |
| 299 | "Attempt to assign a multicast ethernet address to a " |
| 300 | "device disallowed\n"); |
| 301 | goto random; |
| 302 | } |
| 303 | if (!is_valid_ether_addr(addr)) { |
| 304 | printk(KERN_ERR |
| 305 | "Attempt to assign an invalid ethernet address to a " |
| 306 | "device disallowed\n"); |
| 307 | goto random; |
| 308 | } |
| 309 | if (!is_local_ether_addr(addr)) { |
| 310 | printk(KERN_WARNING |
| 311 | "Warning: Assigning a globally valid ethernet " |
| 312 | "address to a device\n"); |
| 313 | printk(KERN_WARNING "You should set the 2nd rightmost bit in " |
| 314 | "the first byte of the MAC,\n"); |
| 315 | printk(KERN_WARNING "i.e. %02x:%02x:%02x:%02x:%02x:%02x\n", |
| 316 | addr[0] | 0x02, addr[1], addr[2], addr[3], addr[4], |
| 317 | addr[5]); |
| 318 | } |
| 319 | eth_hw_addr_set(dev, addr); |
| 320 | return; |
| 321 | |
| 322 | random: |
| 323 | printk(KERN_INFO |
| 324 | "Choosing a random ethernet address for device %s\n", dev->name); |
| 325 | eth_hw_addr_random(dev); |
| 326 | } |
| 327 | |
| 328 | static DEFINE_SPINLOCK(devices_lock); |
| 329 | static LIST_HEAD(devices); |
| 330 | |
| 331 | static struct platform_driver uml_net_driver = { |
| 332 | .driver = { |
| 333 | .name = DRIVER_NAME, |
| 334 | }, |
| 335 | }; |
| 336 | |
| 337 | static void net_device_release(struct device *dev) |
| 338 | { |
| 339 | struct uml_net *device = dev_get_drvdata(dev); |
| 340 | struct net_device *netdev = device->dev; |
| 341 | struct uml_net_private *lp = netdev_priv(netdev); |
| 342 | |
| 343 | if (lp->remove != NULL) |
| 344 | (*lp->remove)(&lp->user); |
| 345 | list_del(&device->list); |
| 346 | kfree(device); |
| 347 | free_netdev(netdev); |
| 348 | } |
| 349 | |
| 350 | static const struct net_device_ops uml_netdev_ops = { |
| 351 | .ndo_open = uml_net_open, |
| 352 | .ndo_stop = uml_net_close, |
| 353 | .ndo_start_xmit = uml_net_start_xmit, |
| 354 | .ndo_set_rx_mode = uml_net_set_multicast_list, |
| 355 | .ndo_tx_timeout = uml_net_tx_timeout, |
| 356 | .ndo_set_mac_address = eth_mac_addr, |
| 357 | .ndo_validate_addr = eth_validate_addr, |
| 358 | #ifdef CONFIG_NET_POLL_CONTROLLER |
| 359 | .ndo_poll_controller = uml_net_poll_controller, |
| 360 | #endif |
| 361 | }; |
| 362 | |
| 363 | /* |
| 364 | * Ensures that platform_driver_register is called only once by |
| 365 | * eth_configure. Will be set in an initcall. |
| 366 | */ |
| 367 | static int driver_registered; |
| 368 | |
| 369 | static void eth_configure(int n, void *init, char *mac, |
| 370 | struct transport *transport, gfp_t gfp_mask) |
| 371 | { |
| 372 | struct uml_net *device; |
| 373 | struct net_device *dev; |
| 374 | struct uml_net_private *lp; |
| 375 | int err, size; |
| 376 | |
| 377 | size = transport->private_size + sizeof(struct uml_net_private); |
| 378 | |
| 379 | device = kzalloc(sizeof(*device), gfp_mask); |
| 380 | if (device == NULL) { |
| 381 | printk(KERN_ERR "eth_configure failed to allocate struct " |
| 382 | "uml_net\n"); |
| 383 | return; |
| 384 | } |
| 385 | |
| 386 | dev = alloc_etherdev(size); |
| 387 | if (dev == NULL) { |
| 388 | printk(KERN_ERR "eth_configure: failed to allocate struct " |
| 389 | "net_device for eth%d\n", n); |
| 390 | goto out_free_device; |
| 391 | } |
| 392 | |
| 393 | INIT_LIST_HEAD(&device->list); |
| 394 | device->index = n; |
| 395 | |
| 396 | /* If this name ends up conflicting with an existing registered |
| 397 | * netdevice, that is OK, register_netdev{,ice}() will notice this |
| 398 | * and fail. |
| 399 | */ |
| 400 | snprintf(dev->name, sizeof(dev->name), "eth%d", n); |
| 401 | |
| 402 | uml_net_setup_etheraddr(dev, mac); |
| 403 | |
| 404 | printk(KERN_INFO "Netdevice %d (%pM) : ", n, dev->dev_addr); |
| 405 | |
| 406 | lp = netdev_priv(dev); |
| 407 | /* This points to the transport private data. It's still clear, but we |
| 408 | * must memset it to 0 *now*. Let's help the drivers. */ |
| 409 | memset(lp, 0, size); |
| 410 | INIT_WORK(&lp->work, uml_dev_close); |
| 411 | |
| 412 | /* sysfs register */ |
| 413 | if (!driver_registered) { |
| 414 | platform_driver_register(¨_net_driver); |
| 415 | driver_registered = 1; |
| 416 | } |
| 417 | device->pdev.id = n; |
| 418 | device->pdev.name = DRIVER_NAME; |
| 419 | device->pdev.dev.release = net_device_release; |
| 420 | dev_set_drvdata(&device->pdev.dev, device); |
| 421 | if (platform_device_register(&device->pdev)) |
| 422 | goto out_free_netdev; |
| 423 | SET_NETDEV_DEV(dev,&device->pdev.dev); |
| 424 | |
| 425 | device->dev = dev; |
| 426 | |
| 427 | /* |
| 428 | * These just fill in a data structure, so there's no failure |
| 429 | * to be worried about. |
| 430 | */ |
| 431 | (*transport->kern->init)(dev, init); |
| 432 | |
| 433 | *lp = ((struct uml_net_private) |
| 434 | { .list = LIST_HEAD_INIT(lp->list), |
| 435 | .dev = dev, |
| 436 | .fd = -1, |
| 437 | .mac = { 0xfe, 0xfd, 0x0, 0x0, 0x0, 0x0}, |
| 438 | .max_packet = transport->user->max_packet, |
| 439 | .protocol = transport->kern->protocol, |
| 440 | .open = transport->user->open, |
| 441 | .close = transport->user->close, |
| 442 | .remove = transport->user->remove, |
| 443 | .read = transport->kern->read, |
| 444 | .write = transport->kern->write, |
| 445 | .add_address = transport->user->add_address, |
| 446 | .delete_address = transport->user->delete_address }); |
| 447 | |
| 448 | spin_lock_init(&lp->lock); |
| 449 | memcpy(lp->mac, dev->dev_addr, sizeof(lp->mac)); |
| 450 | |
| 451 | if ((transport->user->init != NULL) && |
| 452 | ((*transport->user->init)(&lp->user, dev) != 0)) |
| 453 | goto out_unregister; |
| 454 | |
| 455 | dev->mtu = transport->user->mtu; |
| 456 | dev->netdev_ops = ¨_netdev_ops; |
| 457 | dev->ethtool_ops = ¨_net_ethtool_ops; |
| 458 | dev->watchdog_timeo = (HZ >> 1); |
| 459 | dev->irq = UM_ETH_IRQ; |
| 460 | |
| 461 | err = update_drop_skb(lp->max_packet); |
| 462 | if (err) |
| 463 | goto out_undo_user_init; |
| 464 | |
| 465 | rtnl_lock(); |
| 466 | err = register_netdevice(dev); |
| 467 | rtnl_unlock(); |
| 468 | if (err) |
| 469 | goto out_undo_user_init; |
| 470 | |
| 471 | spin_lock(&devices_lock); |
| 472 | list_add(&device->list, &devices); |
| 473 | spin_unlock(&devices_lock); |
| 474 | |
| 475 | return; |
| 476 | |
| 477 | out_undo_user_init: |
| 478 | if (transport->user->remove != NULL) |
| 479 | (*transport->user->remove)(&lp->user); |
| 480 | out_unregister: |
| 481 | platform_device_unregister(&device->pdev); |
| 482 | return; /* platform_device_unregister frees dev and device */ |
| 483 | out_free_netdev: |
| 484 | free_netdev(dev); |
| 485 | out_free_device: |
| 486 | kfree(device); |
| 487 | } |
| 488 | |
| 489 | static struct uml_net *find_device(int n) |
| 490 | { |
| 491 | struct uml_net *device; |
| 492 | struct list_head *ele; |
| 493 | |
| 494 | spin_lock(&devices_lock); |
| 495 | list_for_each(ele, &devices) { |
| 496 | device = list_entry(ele, struct uml_net, list); |
| 497 | if (device->index == n) |
| 498 | goto out; |
| 499 | } |
| 500 | device = NULL; |
| 501 | out: |
| 502 | spin_unlock(&devices_lock); |
| 503 | return device; |
| 504 | } |
| 505 | |
| 506 | static int eth_parse(char *str, int *index_out, char **str_out, |
| 507 | char **error_out) |
| 508 | { |
| 509 | char *end; |
| 510 | int n, err = -EINVAL; |
| 511 | |
| 512 | n = simple_strtoul(str, &end, 0); |
| 513 | if (end == str) { |
| 514 | *error_out = "Bad device number"; |
| 515 | return err; |
| 516 | } |
| 517 | |
| 518 | str = end; |
| 519 | if (*str != '=') { |
| 520 | *error_out = "Expected '=' after device number"; |
| 521 | return err; |
| 522 | } |
| 523 | |
| 524 | str++; |
| 525 | if (find_device(n)) { |
| 526 | *error_out = "Device already configured"; |
| 527 | return err; |
| 528 | } |
| 529 | |
| 530 | *index_out = n; |
| 531 | *str_out = str; |
| 532 | return 0; |
| 533 | } |
| 534 | |
| 535 | struct eth_init { |
| 536 | struct list_head list; |
| 537 | char *init; |
| 538 | int index; |
| 539 | }; |
| 540 | |
| 541 | static DEFINE_SPINLOCK(transports_lock); |
| 542 | static LIST_HEAD(transports); |
| 543 | |
| 544 | /* Filled in during early boot */ |
| 545 | static LIST_HEAD(eth_cmd_line); |
| 546 | |
| 547 | static int check_transport(struct transport *transport, char *eth, int n, |
| 548 | void **init_out, char **mac_out, gfp_t gfp_mask) |
| 549 | { |
| 550 | int len; |
| 551 | |
| 552 | len = strlen(transport->name); |
| 553 | if (strncmp(eth, transport->name, len)) |
| 554 | return 0; |
| 555 | |
| 556 | eth += len; |
| 557 | if (*eth == ',') |
| 558 | eth++; |
| 559 | else if (*eth != '\0') |
| 560 | return 0; |
| 561 | |
| 562 | *init_out = kmalloc(transport->setup_size, gfp_mask); |
| 563 | if (*init_out == NULL) |
| 564 | return 1; |
| 565 | |
| 566 | if (!transport->setup(eth, mac_out, *init_out)) { |
| 567 | kfree(*init_out); |
| 568 | *init_out = NULL; |
| 569 | } |
| 570 | return 1; |
| 571 | } |
| 572 | |
| 573 | void register_transport(struct transport *new) |
| 574 | { |
| 575 | struct list_head *ele, *next; |
| 576 | struct eth_init *eth; |
| 577 | void *init; |
| 578 | char *mac = NULL; |
| 579 | int match; |
| 580 | |
| 581 | spin_lock(&transports_lock); |
| 582 | BUG_ON(!list_empty(&new->list)); |
| 583 | list_add(&new->list, &transports); |
| 584 | spin_unlock(&transports_lock); |
| 585 | |
| 586 | list_for_each_safe(ele, next, ð_cmd_line) { |
| 587 | eth = list_entry(ele, struct eth_init, list); |
| 588 | match = check_transport(new, eth->init, eth->index, &init, |
| 589 | &mac, GFP_KERNEL); |
| 590 | if (!match) |
| 591 | continue; |
| 592 | else if (init != NULL) { |
| 593 | eth_configure(eth->index, init, mac, new, GFP_KERNEL); |
| 594 | kfree(init); |
| 595 | } |
| 596 | list_del(ð->list); |
| 597 | } |
| 598 | } |
| 599 | |
| 600 | static int eth_setup_common(char *str, int index) |
| 601 | { |
| 602 | struct list_head *ele; |
| 603 | struct transport *transport; |
| 604 | void *init; |
| 605 | char *mac = NULL; |
| 606 | int found = 0; |
| 607 | |
| 608 | spin_lock(&transports_lock); |
| 609 | list_for_each(ele, &transports) { |
| 610 | transport = list_entry(ele, struct transport, list); |
| 611 | if (!check_transport(transport, str, index, &init, |
| 612 | &mac, GFP_ATOMIC)) |
| 613 | continue; |
| 614 | if (init != NULL) { |
| 615 | eth_configure(index, init, mac, transport, GFP_ATOMIC); |
| 616 | kfree(init); |
| 617 | } |
| 618 | found = 1; |
| 619 | break; |
| 620 | } |
| 621 | |
| 622 | spin_unlock(&transports_lock); |
| 623 | return found; |
| 624 | } |
| 625 | |
| 626 | static int __init eth_setup(char *str) |
| 627 | { |
| 628 | struct eth_init *new; |
| 629 | char *error; |
| 630 | int n, err; |
| 631 | |
| 632 | err = eth_parse(str, &n, &str, &error); |
| 633 | if (err) { |
| 634 | printk(KERN_ERR "eth_setup - Couldn't parse '%s' : %s\n", |
| 635 | str, error); |
| 636 | return 1; |
| 637 | } |
| 638 | |
| 639 | new = memblock_alloc(sizeof(*new), SMP_CACHE_BYTES); |
| 640 | if (!new) |
| 641 | panic("%s: Failed to allocate %zu bytes\n", __func__, |
| 642 | sizeof(*new)); |
| 643 | |
| 644 | INIT_LIST_HEAD(&new->list); |
| 645 | new->index = n; |
| 646 | new->init = str; |
| 647 | |
| 648 | list_add_tail(&new->list, ð_cmd_line); |
| 649 | return 1; |
| 650 | } |
| 651 | |
| 652 | __setup("eth", eth_setup); |
| 653 | __uml_help(eth_setup, |
| 654 | "eth[0-9]+=<transport>,<options>\n" |
| 655 | " Configure a network device.\n\n" |
| 656 | ); |
| 657 | |
| 658 | static int net_config(char *str, char **error_out) |
| 659 | { |
| 660 | int n, err; |
| 661 | |
| 662 | err = eth_parse(str, &n, &str, error_out); |
| 663 | if (err) |
| 664 | return err; |
| 665 | |
| 666 | /* This string is broken up and the pieces used by the underlying |
| 667 | * driver. So, it is freed only if eth_setup_common fails. |
| 668 | */ |
| 669 | str = kstrdup(str, GFP_KERNEL); |
| 670 | if (str == NULL) { |
| 671 | *error_out = "net_config failed to strdup string"; |
| 672 | return -ENOMEM; |
| 673 | } |
| 674 | err = !eth_setup_common(str, n); |
| 675 | if (err) |
| 676 | kfree(str); |
| 677 | return err; |
| 678 | } |
| 679 | |
| 680 | static int net_id(char **str, int *start_out, int *end_out) |
| 681 | { |
| 682 | char *end; |
| 683 | int n; |
| 684 | |
| 685 | n = simple_strtoul(*str, &end, 0); |
| 686 | if ((*end != '\0') || (end == *str)) |
| 687 | return -1; |
| 688 | |
| 689 | *start_out = n; |
| 690 | *end_out = n; |
| 691 | *str = end; |
| 692 | return n; |
| 693 | } |
| 694 | |
| 695 | static int net_remove(int n, char **error_out) |
| 696 | { |
| 697 | struct uml_net *device; |
| 698 | struct net_device *dev; |
| 699 | struct uml_net_private *lp; |
| 700 | |
| 701 | device = find_device(n); |
| 702 | if (device == NULL) |
| 703 | return -ENODEV; |
| 704 | |
| 705 | dev = device->dev; |
| 706 | lp = netdev_priv(dev); |
| 707 | if (lp->fd > 0) |
| 708 | return -EBUSY; |
| 709 | unregister_netdev(dev); |
| 710 | platform_device_unregister(&device->pdev); |
| 711 | |
| 712 | return 0; |
| 713 | } |
| 714 | |
| 715 | static struct mc_device net_mc = { |
| 716 | .list = LIST_HEAD_INIT(net_mc.list), |
| 717 | .name = "eth", |
| 718 | .config = net_config, |
| 719 | .get_config = NULL, |
| 720 | .id = net_id, |
| 721 | .remove = net_remove, |
| 722 | }; |
| 723 | |
| 724 | #ifdef CONFIG_INET |
| 725 | static int uml_inetaddr_event(struct notifier_block *this, unsigned long event, |
| 726 | void *ptr) |
| 727 | { |
| 728 | struct in_ifaddr *ifa = ptr; |
| 729 | struct net_device *dev = ifa->ifa_dev->dev; |
| 730 | struct uml_net_private *lp; |
| 731 | void (*proc)(unsigned char *, unsigned char *, void *); |
| 732 | unsigned char addr_buf[4], netmask_buf[4]; |
| 733 | |
| 734 | if (dev->netdev_ops->ndo_open != uml_net_open) |
| 735 | return NOTIFY_DONE; |
| 736 | |
| 737 | lp = netdev_priv(dev); |
| 738 | |
| 739 | proc = NULL; |
| 740 | switch (event) { |
| 741 | case NETDEV_UP: |
| 742 | proc = lp->add_address; |
| 743 | break; |
| 744 | case NETDEV_DOWN: |
| 745 | proc = lp->delete_address; |
| 746 | break; |
| 747 | } |
| 748 | if (proc != NULL) { |
| 749 | memcpy(addr_buf, &ifa->ifa_address, sizeof(addr_buf)); |
| 750 | memcpy(netmask_buf, &ifa->ifa_mask, sizeof(netmask_buf)); |
| 751 | (*proc)(addr_buf, netmask_buf, &lp->user); |
| 752 | } |
| 753 | return NOTIFY_DONE; |
| 754 | } |
| 755 | |
| 756 | /* uml_net_init shouldn't be called twice on two CPUs at the same time */ |
| 757 | static struct notifier_block uml_inetaddr_notifier = { |
| 758 | .notifier_call = uml_inetaddr_event, |
| 759 | }; |
| 760 | |
| 761 | static void inet_register(void) |
| 762 | { |
| 763 | struct list_head *ele; |
| 764 | struct uml_net_private *lp; |
| 765 | struct in_device *ip; |
| 766 | struct in_ifaddr *in; |
| 767 | |
| 768 | register_inetaddr_notifier(¨_inetaddr_notifier); |
| 769 | |
| 770 | /* Devices may have been opened already, so the uml_inetaddr_notifier |
| 771 | * didn't get a chance to run for them. This fakes it so that |
| 772 | * addresses which have already been set up get handled properly. |
| 773 | */ |
| 774 | spin_lock(&opened_lock); |
| 775 | list_for_each(ele, &opened) { |
| 776 | lp = list_entry(ele, struct uml_net_private, list); |
| 777 | ip = lp->dev->ip_ptr; |
| 778 | if (ip == NULL) |
| 779 | continue; |
| 780 | in = ip->ifa_list; |
| 781 | while (in != NULL) { |
| 782 | uml_inetaddr_event(NULL, NETDEV_UP, in); |
| 783 | in = in->ifa_next; |
| 784 | } |
| 785 | } |
| 786 | spin_unlock(&opened_lock); |
| 787 | } |
| 788 | #else |
| 789 | static inline void inet_register(void) |
| 790 | { |
| 791 | } |
| 792 | #endif |
| 793 | |
| 794 | static int uml_net_init(void) |
| 795 | { |
| 796 | mconsole_register_dev(&net_mc); |
| 797 | inet_register(); |
| 798 | return 0; |
| 799 | } |
| 800 | |
| 801 | __initcall(uml_net_init); |
| 802 | |
| 803 | static void close_devices(void) |
| 804 | { |
| 805 | struct list_head *ele; |
| 806 | struct uml_net_private *lp; |
| 807 | |
| 808 | spin_lock(&opened_lock); |
| 809 | list_for_each(ele, &opened) { |
| 810 | lp = list_entry(ele, struct uml_net_private, list); |
| 811 | um_free_irq(lp->dev->irq, lp->dev); |
| 812 | if ((lp->close != NULL) && (lp->fd >= 0)) |
| 813 | (*lp->close)(lp->fd, &lp->user); |
| 814 | if (lp->remove != NULL) |
| 815 | (*lp->remove)(&lp->user); |
| 816 | } |
| 817 | spin_unlock(&opened_lock); |
| 818 | } |
| 819 | |
| 820 | __uml_exitcall(close_devices); |
| 821 | |
| 822 | void iter_addresses(void *d, void (*cb)(unsigned char *, unsigned char *, |
| 823 | void *), |
| 824 | void *arg) |
| 825 | { |
| 826 | struct net_device *dev = d; |
| 827 | struct in_device *ip = dev->ip_ptr; |
| 828 | struct in_ifaddr *in; |
| 829 | unsigned char address[4], netmask[4]; |
| 830 | |
| 831 | if (ip == NULL) return; |
| 832 | in = ip->ifa_list; |
| 833 | while (in != NULL) { |
| 834 | memcpy(address, &in->ifa_address, sizeof(address)); |
| 835 | memcpy(netmask, &in->ifa_mask, sizeof(netmask)); |
| 836 | (*cb)(address, netmask, arg); |
| 837 | in = in->ifa_next; |
| 838 | } |
| 839 | } |
| 840 | |
| 841 | int dev_netmask(void *d, void *m) |
| 842 | { |
| 843 | struct net_device *dev = d; |
| 844 | struct in_device *ip = dev->ip_ptr; |
| 845 | struct in_ifaddr *in; |
| 846 | __be32 *mask_out = m; |
| 847 | |
| 848 | if (ip == NULL) |
| 849 | return 1; |
| 850 | |
| 851 | in = ip->ifa_list; |
| 852 | if (in == NULL) |
| 853 | return 1; |
| 854 | |
| 855 | *mask_out = in->ifa_mask; |
| 856 | return 0; |
| 857 | } |
| 858 | |
| 859 | void *get_output_buffer(int *len_out) |
| 860 | { |
| 861 | void *ret; |
| 862 | |
| 863 | ret = (void *) __get_free_pages(GFP_KERNEL, 0); |
| 864 | if (ret) *len_out = PAGE_SIZE; |
| 865 | else *len_out = 0; |
| 866 | return ret; |
| 867 | } |
| 868 | |
| 869 | void free_output_buffer(void *buffer) |
| 870 | { |
| 871 | free_pages((unsigned long) buffer, 0); |
| 872 | } |
| 873 | |
| 874 | int tap_setup_common(char *str, char *type, char **dev_name, char **mac_out, |
| 875 | char **gate_addr) |
| 876 | { |
| 877 | char *remain; |
| 878 | |
| 879 | remain = split_if_spec(str, dev_name, mac_out, gate_addr, NULL); |
| 880 | if (remain != NULL) { |
| 881 | printk(KERN_ERR "tap_setup_common - Extra garbage on " |
| 882 | "specification : '%s'\n", remain); |
| 883 | return 1; |
| 884 | } |
| 885 | |
| 886 | return 0; |
| 887 | } |
| 888 | |
| 889 | unsigned short eth_protocol(struct sk_buff *skb) |
| 890 | { |
| 891 | return eth_type_trans(skb, skb->dev); |
| 892 | } |