| 1 | /* |
| 2 | * Ethernet netdevice using ATM AAL5 as underlying carrier |
| 3 | * (RFC1483 obsoleted by RFC2684) for Linux |
| 4 | * |
| 5 | * Authors: Marcell GAL, 2000, XDSL Ltd, Hungary |
| 6 | * Eric Kinzie, 2006-2007, US Naval Research Laboratory |
| 7 | */ |
| 8 | |
| 9 | #define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__ |
| 10 | |
| 11 | #include <linux/module.h> |
| 12 | #include <linux/init.h> |
| 13 | #include <linux/kernel.h> |
| 14 | #include <linux/list.h> |
| 15 | #include <linux/netdevice.h> |
| 16 | #include <linux/skbuff.h> |
| 17 | #include <linux/etherdevice.h> |
| 18 | #include <linux/rtnetlink.h> |
| 19 | #include <linux/ip.h> |
| 20 | #include <linux/uaccess.h> |
| 21 | #include <linux/slab.h> |
| 22 | #include <net/arp.h> |
| 23 | #include <linux/atm.h> |
| 24 | #include <linux/atmdev.h> |
| 25 | #include <linux/capability.h> |
| 26 | #include <linux/seq_file.h> |
| 27 | |
| 28 | #include <linux/atmbr2684.h> |
| 29 | |
| 30 | #include "common.h" |
| 31 | |
| 32 | static void skb_debug(const struct sk_buff *skb) |
| 33 | { |
| 34 | #ifdef SKB_DEBUG |
| 35 | #define NUM2PRINT 50 |
| 36 | print_hex_dump(KERN_DEBUG, "br2684: skb: ", DUMP_OFFSET, |
| 37 | 16, 1, skb->data, min(NUM2PRINT, skb->len), true); |
| 38 | #endif |
| 39 | } |
| 40 | |
| 41 | #define BR2684_ETHERTYPE_LEN 2 |
| 42 | #define BR2684_PAD_LEN 2 |
| 43 | |
| 44 | #define LLC 0xaa, 0xaa, 0x03 |
| 45 | #define SNAP_BRIDGED 0x00, 0x80, 0xc2 |
| 46 | #define SNAP_ROUTED 0x00, 0x00, 0x00 |
| 47 | #define PID_ETHERNET 0x00, 0x07 |
| 48 | #define ETHERTYPE_IPV4 0x08, 0x00 |
| 49 | #define ETHERTYPE_IPV6 0x86, 0xdd |
| 50 | #define PAD_BRIDGED 0x00, 0x00 |
| 51 | |
| 52 | static const unsigned char ethertype_ipv4[] = { ETHERTYPE_IPV4 }; |
| 53 | static const unsigned char ethertype_ipv6[] = { ETHERTYPE_IPV6 }; |
| 54 | static const unsigned char llc_oui_pid_pad[] = |
| 55 | { LLC, SNAP_BRIDGED, PID_ETHERNET, PAD_BRIDGED }; |
| 56 | static const unsigned char pad[] = { PAD_BRIDGED }; |
| 57 | static const unsigned char llc_oui_ipv4[] = { LLC, SNAP_ROUTED, ETHERTYPE_IPV4 }; |
| 58 | static const unsigned char llc_oui_ipv6[] = { LLC, SNAP_ROUTED, ETHERTYPE_IPV6 }; |
| 59 | |
| 60 | enum br2684_encaps { |
| 61 | e_vc = BR2684_ENCAPS_VC, |
| 62 | e_llc = BR2684_ENCAPS_LLC, |
| 63 | }; |
| 64 | |
| 65 | struct br2684_vcc { |
| 66 | struct atm_vcc *atmvcc; |
| 67 | struct net_device *device; |
| 68 | /* keep old push, pop functions for chaining */ |
| 69 | void (*old_push)(struct atm_vcc *vcc, struct sk_buff *skb); |
| 70 | void (*old_pop)(struct atm_vcc *vcc, struct sk_buff *skb); |
| 71 | void (*old_release_cb)(struct atm_vcc *vcc); |
| 72 | struct module *old_owner; |
| 73 | enum br2684_encaps encaps; |
| 74 | struct list_head brvccs; |
| 75 | #ifdef CONFIG_ATM_BR2684_IPFILTER |
| 76 | struct br2684_filter filter; |
| 77 | #endif /* CONFIG_ATM_BR2684_IPFILTER */ |
| 78 | unsigned int copies_needed, copies_failed; |
| 79 | atomic_t qspace; |
| 80 | }; |
| 81 | |
| 82 | struct br2684_dev { |
| 83 | struct net_device *net_dev; |
| 84 | struct list_head br2684_devs; |
| 85 | int number; |
| 86 | struct list_head brvccs; /* one device <=> one vcc (before xmas) */ |
| 87 | int mac_was_set; |
| 88 | enum br2684_payload payload; |
| 89 | }; |
| 90 | |
| 91 | /* |
| 92 | * This lock should be held for writing any time the list of devices or |
| 93 | * their attached vcc's could be altered. It should be held for reading |
| 94 | * any time these are being queried. Note that we sometimes need to |
| 95 | * do read-locking under interrupt context, so write locking must block |
| 96 | * the current CPU's interrupts |
| 97 | */ |
| 98 | static DEFINE_RWLOCK(devs_lock); |
| 99 | |
| 100 | static LIST_HEAD(br2684_devs); |
| 101 | |
| 102 | static inline struct br2684_dev *BRPRIV(const struct net_device *net_dev) |
| 103 | { |
| 104 | return netdev_priv(net_dev); |
| 105 | } |
| 106 | |
| 107 | static inline struct net_device *list_entry_brdev(const struct list_head *le) |
| 108 | { |
| 109 | return list_entry(le, struct br2684_dev, br2684_devs)->net_dev; |
| 110 | } |
| 111 | |
| 112 | static inline struct br2684_vcc *BR2684_VCC(const struct atm_vcc *atmvcc) |
| 113 | { |
| 114 | return (struct br2684_vcc *)(atmvcc->user_back); |
| 115 | } |
| 116 | |
| 117 | static inline struct br2684_vcc *list_entry_brvcc(const struct list_head *le) |
| 118 | { |
| 119 | return list_entry(le, struct br2684_vcc, brvccs); |
| 120 | } |
| 121 | |
| 122 | /* Caller should hold read_lock(&devs_lock) */ |
| 123 | static struct net_device *br2684_find_dev(const struct br2684_if_spec *s) |
| 124 | { |
| 125 | struct list_head *lh; |
| 126 | struct net_device *net_dev; |
| 127 | switch (s->method) { |
| 128 | case BR2684_FIND_BYNUM: |
| 129 | list_for_each(lh, &br2684_devs) { |
| 130 | net_dev = list_entry_brdev(lh); |
| 131 | if (BRPRIV(net_dev)->number == s->spec.devnum) |
| 132 | return net_dev; |
| 133 | } |
| 134 | break; |
| 135 | case BR2684_FIND_BYIFNAME: |
| 136 | list_for_each(lh, &br2684_devs) { |
| 137 | net_dev = list_entry_brdev(lh); |
| 138 | if (!strncmp(net_dev->name, s->spec.ifname, IFNAMSIZ)) |
| 139 | return net_dev; |
| 140 | } |
| 141 | break; |
| 142 | } |
| 143 | return NULL; |
| 144 | } |
| 145 | |
| 146 | static int atm_dev_event(struct notifier_block *this, unsigned long event, |
| 147 | void *arg) |
| 148 | { |
| 149 | struct atm_dev *atm_dev = arg; |
| 150 | struct list_head *lh; |
| 151 | struct net_device *net_dev; |
| 152 | struct br2684_vcc *brvcc; |
| 153 | struct atm_vcc *atm_vcc; |
| 154 | unsigned long flags; |
| 155 | |
| 156 | pr_debug("event=%ld dev=%p\n", event, atm_dev); |
| 157 | |
| 158 | read_lock_irqsave(&devs_lock, flags); |
| 159 | list_for_each(lh, &br2684_devs) { |
| 160 | net_dev = list_entry_brdev(lh); |
| 161 | |
| 162 | list_for_each_entry(brvcc, &BRPRIV(net_dev)->brvccs, brvccs) { |
| 163 | atm_vcc = brvcc->atmvcc; |
| 164 | if (atm_vcc && brvcc->atmvcc->dev == atm_dev) { |
| 165 | |
| 166 | if (atm_vcc->dev->signal == ATM_PHY_SIG_LOST) |
| 167 | netif_carrier_off(net_dev); |
| 168 | else |
| 169 | netif_carrier_on(net_dev); |
| 170 | |
| 171 | } |
| 172 | } |
| 173 | } |
| 174 | read_unlock_irqrestore(&devs_lock, flags); |
| 175 | |
| 176 | return NOTIFY_DONE; |
| 177 | } |
| 178 | |
| 179 | static struct notifier_block atm_dev_notifier = { |
| 180 | .notifier_call = atm_dev_event, |
| 181 | }; |
| 182 | |
| 183 | /* chained vcc->pop function. Check if we should wake the netif_queue */ |
| 184 | static void br2684_pop(struct atm_vcc *vcc, struct sk_buff *skb) |
| 185 | { |
| 186 | struct br2684_vcc *brvcc = BR2684_VCC(vcc); |
| 187 | |
| 188 | pr_debug("(vcc %p ; net_dev %p )\n", vcc, brvcc->device); |
| 189 | brvcc->old_pop(vcc, skb); |
| 190 | |
| 191 | /* If the queue space just went up from zero, wake */ |
| 192 | if (atomic_inc_return(&brvcc->qspace) == 1) |
| 193 | netif_wake_queue(brvcc->device); |
| 194 | } |
| 195 | |
| 196 | /* |
| 197 | * Send a packet out a particular vcc. Not to useful right now, but paves |
| 198 | * the way for multiple vcc's per itf. Returns true if we can send, |
| 199 | * otherwise false |
| 200 | */ |
| 201 | static int br2684_xmit_vcc(struct sk_buff *skb, struct net_device *dev, |
| 202 | struct br2684_vcc *brvcc) |
| 203 | { |
| 204 | struct br2684_dev *brdev = BRPRIV(dev); |
| 205 | struct atm_vcc *atmvcc; |
| 206 | int minheadroom = (brvcc->encaps == e_llc) ? |
| 207 | ((brdev->payload == p_bridged) ? |
| 208 | sizeof(llc_oui_pid_pad) : sizeof(llc_oui_ipv4)) : |
| 209 | ((brdev->payload == p_bridged) ? BR2684_PAD_LEN : 0); |
| 210 | |
| 211 | if (skb_headroom(skb) < minheadroom) { |
| 212 | struct sk_buff *skb2 = skb_realloc_headroom(skb, minheadroom); |
| 213 | brvcc->copies_needed++; |
| 214 | dev_kfree_skb(skb); |
| 215 | if (skb2 == NULL) { |
| 216 | brvcc->copies_failed++; |
| 217 | return 0; |
| 218 | } |
| 219 | skb = skb2; |
| 220 | } |
| 221 | |
| 222 | if (brvcc->encaps == e_llc) { |
| 223 | if (brdev->payload == p_bridged) { |
| 224 | skb_push(skb, sizeof(llc_oui_pid_pad)); |
| 225 | skb_copy_to_linear_data(skb, llc_oui_pid_pad, |
| 226 | sizeof(llc_oui_pid_pad)); |
| 227 | } else if (brdev->payload == p_routed) { |
| 228 | unsigned short prot = ntohs(skb->protocol); |
| 229 | |
| 230 | skb_push(skb, sizeof(llc_oui_ipv4)); |
| 231 | switch (prot) { |
| 232 | case ETH_P_IP: |
| 233 | skb_copy_to_linear_data(skb, llc_oui_ipv4, |
| 234 | sizeof(llc_oui_ipv4)); |
| 235 | break; |
| 236 | case ETH_P_IPV6: |
| 237 | skb_copy_to_linear_data(skb, llc_oui_ipv6, |
| 238 | sizeof(llc_oui_ipv6)); |
| 239 | break; |
| 240 | default: |
| 241 | dev_kfree_skb(skb); |
| 242 | return 0; |
| 243 | } |
| 244 | } |
| 245 | } else { /* e_vc */ |
| 246 | if (brdev->payload == p_bridged) { |
| 247 | skb_push(skb, 2); |
| 248 | memset(skb->data, 0, 2); |
| 249 | } |
| 250 | } |
| 251 | skb_debug(skb); |
| 252 | |
| 253 | ATM_SKB(skb)->vcc = atmvcc = brvcc->atmvcc; |
| 254 | pr_debug("atm_skb(%p)->vcc(%p)->dev(%p)\n", skb, atmvcc, atmvcc->dev); |
| 255 | atomic_add(skb->truesize, &sk_atm(atmvcc)->sk_wmem_alloc); |
| 256 | ATM_SKB(skb)->atm_options = atmvcc->atm_options; |
| 257 | dev->stats.tx_packets++; |
| 258 | dev->stats.tx_bytes += skb->len; |
| 259 | |
| 260 | if (atomic_dec_return(&brvcc->qspace) < 1) { |
| 261 | /* No more please! */ |
| 262 | netif_stop_queue(brvcc->device); |
| 263 | /* We might have raced with br2684_pop() */ |
| 264 | if (unlikely(atomic_read(&brvcc->qspace) > 0)) |
| 265 | netif_wake_queue(brvcc->device); |
| 266 | } |
| 267 | |
| 268 | /* If this fails immediately, the skb will be freed and br2684_pop() |
| 269 | will wake the queue if appropriate. Just return an error so that |
| 270 | the stats are updated correctly */ |
| 271 | return !atmvcc->send(atmvcc, skb); |
| 272 | } |
| 273 | |
| 274 | static void br2684_release_cb(struct atm_vcc *atmvcc) |
| 275 | { |
| 276 | struct br2684_vcc *brvcc = BR2684_VCC(atmvcc); |
| 277 | |
| 278 | if (atomic_read(&brvcc->qspace) > 0) |
| 279 | netif_wake_queue(brvcc->device); |
| 280 | |
| 281 | if (brvcc->old_release_cb) |
| 282 | brvcc->old_release_cb(atmvcc); |
| 283 | } |
| 284 | |
| 285 | static inline struct br2684_vcc *pick_outgoing_vcc(const struct sk_buff *skb, |
| 286 | const struct br2684_dev *brdev) |
| 287 | { |
| 288 | return list_empty(&brdev->brvccs) ? NULL : list_entry_brvcc(brdev->brvccs.next); /* 1 vcc/dev right now */ |
| 289 | } |
| 290 | |
| 291 | static netdev_tx_t br2684_start_xmit(struct sk_buff *skb, |
| 292 | struct net_device *dev) |
| 293 | { |
| 294 | struct br2684_dev *brdev = BRPRIV(dev); |
| 295 | struct br2684_vcc *brvcc; |
| 296 | struct atm_vcc *atmvcc; |
| 297 | netdev_tx_t ret = NETDEV_TX_OK; |
| 298 | |
| 299 | pr_debug("skb_dst(skb)=%p\n", skb_dst(skb)); |
| 300 | read_lock(&devs_lock); |
| 301 | brvcc = pick_outgoing_vcc(skb, brdev); |
| 302 | if (brvcc == NULL) { |
| 303 | pr_debug("no vcc attached to dev %s\n", dev->name); |
| 304 | dev->stats.tx_errors++; |
| 305 | dev->stats.tx_carrier_errors++; |
| 306 | /* netif_stop_queue(dev); */ |
| 307 | dev_kfree_skb(skb); |
| 308 | goto out_devs; |
| 309 | } |
| 310 | atmvcc = brvcc->atmvcc; |
| 311 | |
| 312 | bh_lock_sock(sk_atm(atmvcc)); |
| 313 | |
| 314 | if (test_bit(ATM_VF_RELEASED, &atmvcc->flags) || |
| 315 | test_bit(ATM_VF_CLOSE, &atmvcc->flags) || |
| 316 | !test_bit(ATM_VF_READY, &atmvcc->flags)) { |
| 317 | dev->stats.tx_dropped++; |
| 318 | dev_kfree_skb(skb); |
| 319 | goto out; |
| 320 | } |
| 321 | |
| 322 | if (sock_owned_by_user(sk_atm(atmvcc))) { |
| 323 | netif_stop_queue(brvcc->device); |
| 324 | ret = NETDEV_TX_BUSY; |
| 325 | goto out; |
| 326 | } |
| 327 | |
| 328 | if (!br2684_xmit_vcc(skb, dev, brvcc)) { |
| 329 | /* |
| 330 | * We should probably use netif_*_queue() here, but that |
| 331 | * involves added complication. We need to walk before |
| 332 | * we can run. |
| 333 | * |
| 334 | * Don't free here! this pointer might be no longer valid! |
| 335 | */ |
| 336 | dev->stats.tx_errors++; |
| 337 | dev->stats.tx_fifo_errors++; |
| 338 | } |
| 339 | out: |
| 340 | bh_unlock_sock(sk_atm(atmvcc)); |
| 341 | out_devs: |
| 342 | read_unlock(&devs_lock); |
| 343 | return ret; |
| 344 | } |
| 345 | |
| 346 | /* |
| 347 | * We remember when the MAC gets set, so we don't override it later with |
| 348 | * the ESI of the ATM card of the first VC |
| 349 | */ |
| 350 | static int br2684_mac_addr(struct net_device *dev, void *p) |
| 351 | { |
| 352 | int err = eth_mac_addr(dev, p); |
| 353 | if (!err) |
| 354 | BRPRIV(dev)->mac_was_set = 1; |
| 355 | return err; |
| 356 | } |
| 357 | |
| 358 | #ifdef CONFIG_ATM_BR2684_IPFILTER |
| 359 | /* this IOCTL is experimental. */ |
| 360 | static int br2684_setfilt(struct atm_vcc *atmvcc, void __user * arg) |
| 361 | { |
| 362 | struct br2684_vcc *brvcc; |
| 363 | struct br2684_filter_set fs; |
| 364 | |
| 365 | if (copy_from_user(&fs, arg, sizeof fs)) |
| 366 | return -EFAULT; |
| 367 | if (fs.ifspec.method != BR2684_FIND_BYNOTHING) { |
| 368 | /* |
| 369 | * This is really a per-vcc thing, but we can also search |
| 370 | * by device. |
| 371 | */ |
| 372 | struct br2684_dev *brdev; |
| 373 | read_lock(&devs_lock); |
| 374 | brdev = BRPRIV(br2684_find_dev(&fs.ifspec)); |
| 375 | if (brdev == NULL || list_empty(&brdev->brvccs) || |
| 376 | brdev->brvccs.next != brdev->brvccs.prev) /* >1 VCC */ |
| 377 | brvcc = NULL; |
| 378 | else |
| 379 | brvcc = list_entry_brvcc(brdev->brvccs.next); |
| 380 | read_unlock(&devs_lock); |
| 381 | if (brvcc == NULL) |
| 382 | return -ESRCH; |
| 383 | } else |
| 384 | brvcc = BR2684_VCC(atmvcc); |
| 385 | memcpy(&brvcc->filter, &fs.filter, sizeof(brvcc->filter)); |
| 386 | return 0; |
| 387 | } |
| 388 | |
| 389 | /* Returns 1 if packet should be dropped */ |
| 390 | static inline int |
| 391 | packet_fails_filter(__be16 type, struct br2684_vcc *brvcc, struct sk_buff *skb) |
| 392 | { |
| 393 | if (brvcc->filter.netmask == 0) |
| 394 | return 0; /* no filter in place */ |
| 395 | if (type == htons(ETH_P_IP) && |
| 396 | (((struct iphdr *)(skb->data))->daddr & brvcc->filter. |
| 397 | netmask) == brvcc->filter.prefix) |
| 398 | return 0; |
| 399 | if (type == htons(ETH_P_ARP)) |
| 400 | return 0; |
| 401 | /* |
| 402 | * TODO: we should probably filter ARPs too.. don't want to have |
| 403 | * them returning values that don't make sense, or is that ok? |
| 404 | */ |
| 405 | return 1; /* drop */ |
| 406 | } |
| 407 | #endif /* CONFIG_ATM_BR2684_IPFILTER */ |
| 408 | |
| 409 | static void br2684_close_vcc(struct br2684_vcc *brvcc) |
| 410 | { |
| 411 | pr_debug("removing VCC %p from dev %p\n", brvcc, brvcc->device); |
| 412 | write_lock_irq(&devs_lock); |
| 413 | list_del(&brvcc->brvccs); |
| 414 | write_unlock_irq(&devs_lock); |
| 415 | brvcc->atmvcc->user_back = NULL; /* what about vcc->recvq ??? */ |
| 416 | brvcc->atmvcc->release_cb = brvcc->old_release_cb; |
| 417 | brvcc->old_push(brvcc->atmvcc, NULL); /* pass on the bad news */ |
| 418 | module_put(brvcc->old_owner); |
| 419 | kfree(brvcc); |
| 420 | } |
| 421 | |
| 422 | /* when AAL5 PDU comes in: */ |
| 423 | static void br2684_push(struct atm_vcc *atmvcc, struct sk_buff *skb) |
| 424 | { |
| 425 | struct br2684_vcc *brvcc = BR2684_VCC(atmvcc); |
| 426 | struct net_device *net_dev = brvcc->device; |
| 427 | struct br2684_dev *brdev = BRPRIV(net_dev); |
| 428 | |
| 429 | pr_debug("\n"); |
| 430 | |
| 431 | if (unlikely(skb == NULL)) { |
| 432 | /* skb==NULL means VCC is being destroyed */ |
| 433 | br2684_close_vcc(brvcc); |
| 434 | if (list_empty(&brdev->brvccs)) { |
| 435 | write_lock_irq(&devs_lock); |
| 436 | list_del(&brdev->br2684_devs); |
| 437 | write_unlock_irq(&devs_lock); |
| 438 | unregister_netdev(net_dev); |
| 439 | free_netdev(net_dev); |
| 440 | } |
| 441 | return; |
| 442 | } |
| 443 | |
| 444 | skb_debug(skb); |
| 445 | atm_return(atmvcc, skb->truesize); |
| 446 | pr_debug("skb from brdev %p\n", brdev); |
| 447 | if (brvcc->encaps == e_llc) { |
| 448 | |
| 449 | if (skb->len > 7 && skb->data[7] == 0x01) |
| 450 | __skb_trim(skb, skb->len - 4); |
| 451 | |
| 452 | /* accept packets that have "ipv[46]" in the snap header */ |
| 453 | if ((skb->len >= (sizeof(llc_oui_ipv4))) && |
| 454 | (memcmp(skb->data, llc_oui_ipv4, |
| 455 | sizeof(llc_oui_ipv4) - BR2684_ETHERTYPE_LEN) == 0)) { |
| 456 | if (memcmp(skb->data + 6, ethertype_ipv6, |
| 457 | sizeof(ethertype_ipv6)) == 0) |
| 458 | skb->protocol = htons(ETH_P_IPV6); |
| 459 | else if (memcmp(skb->data + 6, ethertype_ipv4, |
| 460 | sizeof(ethertype_ipv4)) == 0) |
| 461 | skb->protocol = htons(ETH_P_IP); |
| 462 | else |
| 463 | goto error; |
| 464 | skb_pull(skb, sizeof(llc_oui_ipv4)); |
| 465 | skb_reset_network_header(skb); |
| 466 | skb->pkt_type = PACKET_HOST; |
| 467 | /* |
| 468 | * Let us waste some time for checking the encapsulation. |
| 469 | * Note, that only 7 char is checked so frames with a valid FCS |
| 470 | * are also accepted (but FCS is not checked of course). |
| 471 | */ |
| 472 | } else if ((skb->len >= sizeof(llc_oui_pid_pad)) && |
| 473 | (memcmp(skb->data, llc_oui_pid_pad, 7) == 0)) { |
| 474 | skb_pull(skb, sizeof(llc_oui_pid_pad)); |
| 475 | skb->protocol = eth_type_trans(skb, net_dev); |
| 476 | } else |
| 477 | goto error; |
| 478 | |
| 479 | } else { /* e_vc */ |
| 480 | if (brdev->payload == p_routed) { |
| 481 | struct iphdr *iph; |
| 482 | |
| 483 | skb_reset_network_header(skb); |
| 484 | iph = ip_hdr(skb); |
| 485 | if (iph->version == 4) |
| 486 | skb->protocol = htons(ETH_P_IP); |
| 487 | else if (iph->version == 6) |
| 488 | skb->protocol = htons(ETH_P_IPV6); |
| 489 | else |
| 490 | goto error; |
| 491 | skb->pkt_type = PACKET_HOST; |
| 492 | } else { /* p_bridged */ |
| 493 | /* first 2 chars should be 0 */ |
| 494 | if (memcmp(skb->data, pad, BR2684_PAD_LEN) != 0) |
| 495 | goto error; |
| 496 | skb_pull(skb, BR2684_PAD_LEN); |
| 497 | skb->protocol = eth_type_trans(skb, net_dev); |
| 498 | } |
| 499 | } |
| 500 | |
| 501 | #ifdef CONFIG_ATM_BR2684_IPFILTER |
| 502 | if (unlikely(packet_fails_filter(skb->protocol, brvcc, skb))) |
| 503 | goto dropped; |
| 504 | #endif /* CONFIG_ATM_BR2684_IPFILTER */ |
| 505 | skb->dev = net_dev; |
| 506 | ATM_SKB(skb)->vcc = atmvcc; /* needed ? */ |
| 507 | pr_debug("received packet's protocol: %x\n", ntohs(skb->protocol)); |
| 508 | skb_debug(skb); |
| 509 | /* sigh, interface is down? */ |
| 510 | if (unlikely(!(net_dev->flags & IFF_UP))) |
| 511 | goto dropped; |
| 512 | net_dev->stats.rx_packets++; |
| 513 | net_dev->stats.rx_bytes += skb->len; |
| 514 | memset(ATM_SKB(skb), 0, sizeof(struct atm_skb_data)); |
| 515 | netif_rx(skb); |
| 516 | return; |
| 517 | |
| 518 | dropped: |
| 519 | net_dev->stats.rx_dropped++; |
| 520 | goto free_skb; |
| 521 | error: |
| 522 | net_dev->stats.rx_errors++; |
| 523 | free_skb: |
| 524 | dev_kfree_skb(skb); |
| 525 | } |
| 526 | |
| 527 | /* |
| 528 | * Assign a vcc to a dev |
| 529 | * Note: we do not have explicit unassign, but look at _push() |
| 530 | */ |
| 531 | static int br2684_regvcc(struct atm_vcc *atmvcc, void __user * arg) |
| 532 | { |
| 533 | struct br2684_vcc *brvcc; |
| 534 | struct br2684_dev *brdev; |
| 535 | struct net_device *net_dev; |
| 536 | struct atm_backend_br2684 be; |
| 537 | int err; |
| 538 | |
| 539 | if (copy_from_user(&be, arg, sizeof be)) |
| 540 | return -EFAULT; |
| 541 | brvcc = kzalloc(sizeof(struct br2684_vcc), GFP_KERNEL); |
| 542 | if (!brvcc) |
| 543 | return -ENOMEM; |
| 544 | /* |
| 545 | * Allow two packets in the ATM queue. One actually being sent, and one |
| 546 | * for the ATM 'TX done' handler to send. It shouldn't take long to get |
| 547 | * the next one from the netdev queue, when we need it. More than that |
| 548 | * would be bufferbloat. |
| 549 | */ |
| 550 | atomic_set(&brvcc->qspace, 2); |
| 551 | write_lock_irq(&devs_lock); |
| 552 | net_dev = br2684_find_dev(&be.ifspec); |
| 553 | if (net_dev == NULL) { |
| 554 | pr_err("tried to attach to non-existent device\n"); |
| 555 | err = -ENXIO; |
| 556 | goto error; |
| 557 | } |
| 558 | brdev = BRPRIV(net_dev); |
| 559 | if (atmvcc->push == NULL) { |
| 560 | err = -EBADFD; |
| 561 | goto error; |
| 562 | } |
| 563 | if (!list_empty(&brdev->brvccs)) { |
| 564 | /* Only 1 VCC/dev right now */ |
| 565 | err = -EEXIST; |
| 566 | goto error; |
| 567 | } |
| 568 | if (be.fcs_in != BR2684_FCSIN_NO || |
| 569 | be.fcs_out != BR2684_FCSOUT_NO || |
| 570 | be.fcs_auto || be.has_vpiid || be.send_padding || |
| 571 | (be.encaps != BR2684_ENCAPS_VC && |
| 572 | be.encaps != BR2684_ENCAPS_LLC) || |
| 573 | be.min_size != 0) { |
| 574 | err = -EINVAL; |
| 575 | goto error; |
| 576 | } |
| 577 | pr_debug("vcc=%p, encaps=%d, brvcc=%p\n", atmvcc, be.encaps, brvcc); |
| 578 | if (list_empty(&brdev->brvccs) && !brdev->mac_was_set) { |
| 579 | unsigned char *esi = atmvcc->dev->esi; |
| 580 | if (esi[0] | esi[1] | esi[2] | esi[3] | esi[4] | esi[5]) |
| 581 | memcpy(net_dev->dev_addr, esi, net_dev->addr_len); |
| 582 | else |
| 583 | net_dev->dev_addr[2] = 1; |
| 584 | } |
| 585 | list_add(&brvcc->brvccs, &brdev->brvccs); |
| 586 | write_unlock_irq(&devs_lock); |
| 587 | brvcc->device = net_dev; |
| 588 | brvcc->atmvcc = atmvcc; |
| 589 | atmvcc->user_back = brvcc; |
| 590 | brvcc->encaps = (enum br2684_encaps)be.encaps; |
| 591 | brvcc->old_push = atmvcc->push; |
| 592 | brvcc->old_pop = atmvcc->pop; |
| 593 | brvcc->old_release_cb = atmvcc->release_cb; |
| 594 | brvcc->old_owner = atmvcc->owner; |
| 595 | barrier(); |
| 596 | atmvcc->push = br2684_push; |
| 597 | atmvcc->pop = br2684_pop; |
| 598 | atmvcc->release_cb = br2684_release_cb; |
| 599 | atmvcc->owner = THIS_MODULE; |
| 600 | |
| 601 | /* initialize netdev carrier state */ |
| 602 | if (atmvcc->dev->signal == ATM_PHY_SIG_LOST) |
| 603 | netif_carrier_off(net_dev); |
| 604 | else |
| 605 | netif_carrier_on(net_dev); |
| 606 | |
| 607 | __module_get(THIS_MODULE); |
| 608 | |
| 609 | /* re-process everything received between connection setup and |
| 610 | backend setup */ |
| 611 | vcc_process_recv_queue(atmvcc); |
| 612 | return 0; |
| 613 | |
| 614 | error: |
| 615 | write_unlock_irq(&devs_lock); |
| 616 | kfree(brvcc); |
| 617 | return err; |
| 618 | } |
| 619 | |
| 620 | static const struct net_device_ops br2684_netdev_ops = { |
| 621 | .ndo_start_xmit = br2684_start_xmit, |
| 622 | .ndo_set_mac_address = br2684_mac_addr, |
| 623 | .ndo_change_mtu = eth_change_mtu, |
| 624 | .ndo_validate_addr = eth_validate_addr, |
| 625 | }; |
| 626 | |
| 627 | static const struct net_device_ops br2684_netdev_ops_routed = { |
| 628 | .ndo_start_xmit = br2684_start_xmit, |
| 629 | .ndo_set_mac_address = br2684_mac_addr, |
| 630 | .ndo_change_mtu = eth_change_mtu |
| 631 | }; |
| 632 | |
| 633 | static void br2684_setup(struct net_device *netdev) |
| 634 | { |
| 635 | struct br2684_dev *brdev = BRPRIV(netdev); |
| 636 | |
| 637 | ether_setup(netdev); |
| 638 | netdev->hard_header_len += sizeof(llc_oui_pid_pad); /* worst case */ |
| 639 | brdev->net_dev = netdev; |
| 640 | |
| 641 | netdev->netdev_ops = &br2684_netdev_ops; |
| 642 | |
| 643 | INIT_LIST_HEAD(&brdev->brvccs); |
| 644 | } |
| 645 | |
| 646 | static void br2684_setup_routed(struct net_device *netdev) |
| 647 | { |
| 648 | struct br2684_dev *brdev = BRPRIV(netdev); |
| 649 | |
| 650 | brdev->net_dev = netdev; |
| 651 | netdev->hard_header_len = sizeof(llc_oui_ipv4); /* worst case */ |
| 652 | netdev->netdev_ops = &br2684_netdev_ops_routed; |
| 653 | netdev->addr_len = 0; |
| 654 | netdev->mtu = 1500; |
| 655 | netdev->type = ARPHRD_PPP; |
| 656 | netdev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; |
| 657 | netdev->tx_queue_len = 100; |
| 658 | INIT_LIST_HEAD(&brdev->brvccs); |
| 659 | } |
| 660 | |
| 661 | static int br2684_create(void __user *arg) |
| 662 | { |
| 663 | int err; |
| 664 | struct net_device *netdev; |
| 665 | struct br2684_dev *brdev; |
| 666 | struct atm_newif_br2684 ni; |
| 667 | enum br2684_payload payload; |
| 668 | |
| 669 | pr_debug("\n"); |
| 670 | |
| 671 | if (copy_from_user(&ni, arg, sizeof ni)) |
| 672 | return -EFAULT; |
| 673 | |
| 674 | if (ni.media & BR2684_FLAG_ROUTED) |
| 675 | payload = p_routed; |
| 676 | else |
| 677 | payload = p_bridged; |
| 678 | ni.media &= 0xffff; /* strip flags */ |
| 679 | |
| 680 | if (ni.media != BR2684_MEDIA_ETHERNET || ni.mtu != 1500) |
| 681 | return -EINVAL; |
| 682 | |
| 683 | netdev = alloc_netdev(sizeof(struct br2684_dev), |
| 684 | ni.ifname[0] ? ni.ifname : "nas%d", |
| 685 | NET_NAME_UNKNOWN, |
| 686 | (payload == p_routed) ? br2684_setup_routed : br2684_setup); |
| 687 | if (!netdev) |
| 688 | return -ENOMEM; |
| 689 | |
| 690 | brdev = BRPRIV(netdev); |
| 691 | |
| 692 | pr_debug("registered netdev %s\n", netdev->name); |
| 693 | /* open, stop, do_ioctl ? */ |
| 694 | err = register_netdev(netdev); |
| 695 | if (err < 0) { |
| 696 | pr_err("register_netdev failed\n"); |
| 697 | free_netdev(netdev); |
| 698 | return err; |
| 699 | } |
| 700 | |
| 701 | write_lock_irq(&devs_lock); |
| 702 | |
| 703 | brdev->payload = payload; |
| 704 | |
| 705 | if (list_empty(&br2684_devs)) { |
| 706 | /* 1st br2684 device */ |
| 707 | brdev->number = 1; |
| 708 | } else |
| 709 | brdev->number = BRPRIV(list_entry_brdev(br2684_devs.prev))->number + 1; |
| 710 | |
| 711 | list_add_tail(&brdev->br2684_devs, &br2684_devs); |
| 712 | write_unlock_irq(&devs_lock); |
| 713 | return 0; |
| 714 | } |
| 715 | |
| 716 | /* |
| 717 | * This handles ioctls actually performed on our vcc - we must return |
| 718 | * -ENOIOCTLCMD for any unrecognized ioctl |
| 719 | */ |
| 720 | static int br2684_ioctl(struct socket *sock, unsigned int cmd, |
| 721 | unsigned long arg) |
| 722 | { |
| 723 | struct atm_vcc *atmvcc = ATM_SD(sock); |
| 724 | void __user *argp = (void __user *)arg; |
| 725 | atm_backend_t b; |
| 726 | |
| 727 | int err; |
| 728 | switch (cmd) { |
| 729 | case ATM_SETBACKEND: |
| 730 | case ATM_NEWBACKENDIF: |
| 731 | err = get_user(b, (atm_backend_t __user *) argp); |
| 732 | if (err) |
| 733 | return -EFAULT; |
| 734 | if (b != ATM_BACKEND_BR2684) |
| 735 | return -ENOIOCTLCMD; |
| 736 | if (!capable(CAP_NET_ADMIN)) |
| 737 | return -EPERM; |
| 738 | if (cmd == ATM_SETBACKEND) { |
| 739 | if (sock->state != SS_CONNECTED) |
| 740 | return -EINVAL; |
| 741 | return br2684_regvcc(atmvcc, argp); |
| 742 | } else { |
| 743 | return br2684_create(argp); |
| 744 | } |
| 745 | #ifdef CONFIG_ATM_BR2684_IPFILTER |
| 746 | case BR2684_SETFILT: |
| 747 | if (atmvcc->push != br2684_push) |
| 748 | return -ENOIOCTLCMD; |
| 749 | if (!capable(CAP_NET_ADMIN)) |
| 750 | return -EPERM; |
| 751 | err = br2684_setfilt(atmvcc, argp); |
| 752 | |
| 753 | return err; |
| 754 | #endif /* CONFIG_ATM_BR2684_IPFILTER */ |
| 755 | } |
| 756 | return -ENOIOCTLCMD; |
| 757 | } |
| 758 | |
| 759 | static struct atm_ioctl br2684_ioctl_ops = { |
| 760 | .owner = THIS_MODULE, |
| 761 | .ioctl = br2684_ioctl, |
| 762 | }; |
| 763 | |
| 764 | #ifdef CONFIG_PROC_FS |
| 765 | static void *br2684_seq_start(struct seq_file *seq, loff_t * pos) |
| 766 | __acquires(devs_lock) |
| 767 | { |
| 768 | read_lock(&devs_lock); |
| 769 | return seq_list_start(&br2684_devs, *pos); |
| 770 | } |
| 771 | |
| 772 | static void *br2684_seq_next(struct seq_file *seq, void *v, loff_t * pos) |
| 773 | { |
| 774 | return seq_list_next(v, &br2684_devs, pos); |
| 775 | } |
| 776 | |
| 777 | static void br2684_seq_stop(struct seq_file *seq, void *v) |
| 778 | __releases(devs_lock) |
| 779 | { |
| 780 | read_unlock(&devs_lock); |
| 781 | } |
| 782 | |
| 783 | static int br2684_seq_show(struct seq_file *seq, void *v) |
| 784 | { |
| 785 | const struct br2684_dev *brdev = list_entry(v, struct br2684_dev, |
| 786 | br2684_devs); |
| 787 | const struct net_device *net_dev = brdev->net_dev; |
| 788 | const struct br2684_vcc *brvcc; |
| 789 | |
| 790 | seq_printf(seq, "dev %.16s: num=%d, mac=%pM (%s)\n", |
| 791 | net_dev->name, |
| 792 | brdev->number, |
| 793 | net_dev->dev_addr, |
| 794 | brdev->mac_was_set ? "set" : "auto"); |
| 795 | |
| 796 | list_for_each_entry(brvcc, &brdev->brvccs, brvccs) { |
| 797 | seq_printf(seq, " vcc %d.%d.%d: encaps=%s payload=%s" |
| 798 | ", failed copies %u/%u" |
| 799 | "\n", brvcc->atmvcc->dev->number, |
| 800 | brvcc->atmvcc->vpi, brvcc->atmvcc->vci, |
| 801 | (brvcc->encaps == e_llc) ? "LLC" : "VC", |
| 802 | (brdev->payload == p_bridged) ? "bridged" : "routed", |
| 803 | brvcc->copies_failed, brvcc->copies_needed); |
| 804 | #ifdef CONFIG_ATM_BR2684_IPFILTER |
| 805 | if (brvcc->filter.netmask != 0) |
| 806 | seq_printf(seq, " filter=%pI4/%pI4\n", |
| 807 | &brvcc->filter.prefix, |
| 808 | &brvcc->filter.netmask); |
| 809 | #endif /* CONFIG_ATM_BR2684_IPFILTER */ |
| 810 | } |
| 811 | return 0; |
| 812 | } |
| 813 | |
| 814 | static const struct seq_operations br2684_seq_ops = { |
| 815 | .start = br2684_seq_start, |
| 816 | .next = br2684_seq_next, |
| 817 | .stop = br2684_seq_stop, |
| 818 | .show = br2684_seq_show, |
| 819 | }; |
| 820 | |
| 821 | static int br2684_proc_open(struct inode *inode, struct file *file) |
| 822 | { |
| 823 | return seq_open(file, &br2684_seq_ops); |
| 824 | } |
| 825 | |
| 826 | static const struct file_operations br2684_proc_ops = { |
| 827 | .owner = THIS_MODULE, |
| 828 | .open = br2684_proc_open, |
| 829 | .read = seq_read, |
| 830 | .llseek = seq_lseek, |
| 831 | .release = seq_release, |
| 832 | }; |
| 833 | |
| 834 | extern struct proc_dir_entry *atm_proc_root; /* from proc.c */ |
| 835 | #endif /* CONFIG_PROC_FS */ |
| 836 | |
| 837 | static int __init br2684_init(void) |
| 838 | { |
| 839 | #ifdef CONFIG_PROC_FS |
| 840 | struct proc_dir_entry *p; |
| 841 | p = proc_create("br2684", 0, atm_proc_root, &br2684_proc_ops); |
| 842 | if (p == NULL) |
| 843 | return -ENOMEM; |
| 844 | #endif |
| 845 | register_atm_ioctl(&br2684_ioctl_ops); |
| 846 | register_atmdevice_notifier(&atm_dev_notifier); |
| 847 | return 0; |
| 848 | } |
| 849 | |
| 850 | static void __exit br2684_exit(void) |
| 851 | { |
| 852 | struct net_device *net_dev; |
| 853 | struct br2684_dev *brdev; |
| 854 | struct br2684_vcc *brvcc; |
| 855 | deregister_atm_ioctl(&br2684_ioctl_ops); |
| 856 | |
| 857 | #ifdef CONFIG_PROC_FS |
| 858 | remove_proc_entry("br2684", atm_proc_root); |
| 859 | #endif |
| 860 | |
| 861 | |
| 862 | unregister_atmdevice_notifier(&atm_dev_notifier); |
| 863 | |
| 864 | while (!list_empty(&br2684_devs)) { |
| 865 | net_dev = list_entry_brdev(br2684_devs.next); |
| 866 | brdev = BRPRIV(net_dev); |
| 867 | while (!list_empty(&brdev->brvccs)) { |
| 868 | brvcc = list_entry_brvcc(brdev->brvccs.next); |
| 869 | br2684_close_vcc(brvcc); |
| 870 | } |
| 871 | |
| 872 | list_del(&brdev->br2684_devs); |
| 873 | unregister_netdev(net_dev); |
| 874 | free_netdev(net_dev); |
| 875 | } |
| 876 | } |
| 877 | |
| 878 | module_init(br2684_init); |
| 879 | module_exit(br2684_exit); |
| 880 | |
| 881 | MODULE_AUTHOR("Marcell GAL"); |
| 882 | MODULE_DESCRIPTION("RFC2684 bridged protocols over ATM/AAL5"); |
| 883 | MODULE_LICENSE("GPL"); |