Thomas Gleixner | 09c434b | 2019-05-19 13:08:20 +0100 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0-only |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | /* drivers/atm/atmtcp.c - ATM over TCP "device" driver */ |
| 3 | |
| 4 | /* Written 1997-2000 by Werner Almesberger, EPFL LRC/ICA */ |
| 5 | |
| 6 | |
| 7 | #include <linux/module.h> |
| 8 | #include <linux/wait.h> |
| 9 | #include <linux/atmdev.h> |
| 10 | #include <linux/atm_tcp.h> |
| 11 | #include <linux/bitops.h> |
| 12 | #include <linux/init.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 13 | #include <linux/slab.h> |
Linus Torvalds | 7c0f6ba | 2016-12-24 11:46:01 -0800 | [diff] [blame] | 14 | #include <linux/uaccess.h> |
Arun Sharma | 60063497 | 2011-07-26 16:09:06 -0700 | [diff] [blame] | 15 | #include <linux/atomic.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | |
| 17 | |
| 18 | extern int atm_init_aal5(struct atm_vcc *vcc); /* "raw" AAL5 transport */ |
| 19 | |
| 20 | |
| 21 | #define PRIV(dev) ((struct atmtcp_dev_data *) ((dev)->dev_data)) |
| 22 | |
| 23 | |
| 24 | struct atmtcp_dev_data { |
| 25 | struct atm_vcc *vcc; /* control VCC; NULL if detached */ |
| 26 | int persist; /* non-zero if persistent */ |
| 27 | }; |
| 28 | |
| 29 | |
| 30 | #define DEV_LABEL "atmtcp" |
| 31 | |
| 32 | #define MAX_VPI_BITS 8 /* simplifies life */ |
| 33 | #define MAX_VCI_BITS 16 |
| 34 | |
| 35 | |
| 36 | /* |
| 37 | * Hairy code ahead: the control VCC may be closed while we're still |
| 38 | * waiting for an answer, so we need to re-validate out_vcc every once |
| 39 | * in a while. |
| 40 | */ |
| 41 | |
| 42 | |
| 43 | static int atmtcp_send_control(struct atm_vcc *vcc,int type, |
| 44 | const struct atmtcp_control *msg,int flag) |
| 45 | { |
| 46 | DECLARE_WAITQUEUE(wait,current); |
| 47 | struct atm_vcc *out_vcc; |
| 48 | struct sk_buff *skb; |
| 49 | struct atmtcp_control *new_msg; |
| 50 | int old_test; |
| 51 | int error = 0; |
| 52 | |
| 53 | out_vcc = PRIV(vcc->dev) ? PRIV(vcc->dev)->vcc : NULL; |
| 54 | if (!out_vcc) return -EUNATCH; |
| 55 | skb = alloc_skb(sizeof(*msg),GFP_KERNEL); |
| 56 | if (!skb) return -ENOMEM; |
| 57 | mb(); |
| 58 | out_vcc = PRIV(vcc->dev) ? PRIV(vcc->dev)->vcc : NULL; |
| 59 | if (!out_vcc) { |
| 60 | dev_kfree_skb(skb); |
| 61 | return -EUNATCH; |
| 62 | } |
| 63 | atm_force_charge(out_vcc,skb->truesize); |
Johannes Berg | 4df864c | 2017-06-16 14:29:21 +0200 | [diff] [blame] | 64 | new_msg = skb_put(skb, sizeof(*new_msg)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | *new_msg = *msg; |
| 66 | new_msg->hdr.length = ATMTCP_HDR_MAGIC; |
| 67 | new_msg->type = type; |
| 68 | memset(&new_msg->vcc,0,sizeof(atm_kptr_t)); |
| 69 | *(struct atm_vcc **) &new_msg->vcc = vcc; |
| 70 | old_test = test_bit(flag,&vcc->flags); |
| 71 | out_vcc->push(out_vcc,skb); |
Eric Dumazet | aa39514 | 2010-04-20 13:03:51 +0000 | [diff] [blame] | 72 | add_wait_queue(sk_sleep(sk_atm(vcc)), &wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | while (test_bit(flag,&vcc->flags) == old_test) { |
| 74 | mb(); |
| 75 | out_vcc = PRIV(vcc->dev) ? PRIV(vcc->dev)->vcc : NULL; |
| 76 | if (!out_vcc) { |
| 77 | error = -EUNATCH; |
| 78 | break; |
| 79 | } |
| 80 | set_current_state(TASK_UNINTERRUPTIBLE); |
| 81 | schedule(); |
| 82 | } |
| 83 | set_current_state(TASK_RUNNING); |
Eric Dumazet | aa39514 | 2010-04-20 13:03:51 +0000 | [diff] [blame] | 84 | remove_wait_queue(sk_sleep(sk_atm(vcc)), &wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | return error; |
| 86 | } |
| 87 | |
| 88 | |
| 89 | static int atmtcp_recv_control(const struct atmtcp_control *msg) |
| 90 | { |
| 91 | struct atm_vcc *vcc = *(struct atm_vcc **) &msg->vcc; |
| 92 | |
| 93 | vcc->vpi = msg->addr.sap_addr.vpi; |
| 94 | vcc->vci = msg->addr.sap_addr.vci; |
| 95 | vcc->qos = msg->qos; |
| 96 | sk_atm(vcc)->sk_err = -msg->result; |
| 97 | switch (msg->type) { |
| 98 | case ATMTCP_CTRL_OPEN: |
| 99 | change_bit(ATM_VF_READY,&vcc->flags); |
| 100 | break; |
| 101 | case ATMTCP_CTRL_CLOSE: |
| 102 | change_bit(ATM_VF_ADDR,&vcc->flags); |
| 103 | break; |
| 104 | default: |
| 105 | printk(KERN_ERR "atmtcp_recv_control: unknown type %d\n", |
| 106 | msg->type); |
| 107 | return -EINVAL; |
| 108 | } |
Eric Dumazet | aa39514 | 2010-04-20 13:03:51 +0000 | [diff] [blame] | 109 | wake_up(sk_sleep(sk_atm(vcc))); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | return 0; |
| 111 | } |
| 112 | |
| 113 | |
| 114 | static void atmtcp_v_dev_close(struct atm_dev *dev) |
| 115 | { |
| 116 | /* Nothing.... Isn't this simple :-) -- REW */ |
| 117 | } |
| 118 | |
| 119 | |
| 120 | static int atmtcp_v_open(struct atm_vcc *vcc) |
| 121 | { |
| 122 | struct atmtcp_control msg; |
| 123 | int error; |
| 124 | short vpi = vcc->vpi; |
| 125 | int vci = vcc->vci; |
| 126 | |
| 127 | memset(&msg,0,sizeof(msg)); |
| 128 | msg.addr.sap_family = AF_ATMPVC; |
| 129 | msg.hdr.vpi = htons(vpi); |
| 130 | msg.addr.sap_addr.vpi = vpi; |
| 131 | msg.hdr.vci = htons(vci); |
| 132 | msg.addr.sap_addr.vci = vci; |
| 133 | if (vpi == ATM_VPI_UNSPEC || vci == ATM_VCI_UNSPEC) return 0; |
| 134 | msg.type = ATMTCP_CTRL_OPEN; |
| 135 | msg.qos = vcc->qos; |
| 136 | set_bit(ATM_VF_ADDR,&vcc->flags); |
| 137 | clear_bit(ATM_VF_READY,&vcc->flags); /* just in case ... */ |
| 138 | error = atmtcp_send_control(vcc,ATMTCP_CTRL_OPEN,&msg,ATM_VF_READY); |
| 139 | if (error) return error; |
| 140 | return -sk_atm(vcc)->sk_err; |
| 141 | } |
| 142 | |
| 143 | |
| 144 | static void atmtcp_v_close(struct atm_vcc *vcc) |
| 145 | { |
| 146 | struct atmtcp_control msg; |
| 147 | |
| 148 | memset(&msg,0,sizeof(msg)); |
| 149 | msg.addr.sap_family = AF_ATMPVC; |
| 150 | msg.addr.sap_addr.vpi = vcc->vpi; |
| 151 | msg.addr.sap_addr.vci = vcc->vci; |
| 152 | clear_bit(ATM_VF_READY,&vcc->flags); |
| 153 | (void) atmtcp_send_control(vcc,ATMTCP_CTRL_CLOSE,&msg,ATM_VF_ADDR); |
| 154 | } |
| 155 | |
| 156 | |
| 157 | static int atmtcp_v_ioctl(struct atm_dev *dev,unsigned int cmd,void __user *arg) |
| 158 | { |
| 159 | struct atm_cirange ci; |
| 160 | struct atm_vcc *vcc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 161 | struct sock *s; |
| 162 | int i; |
| 163 | |
| 164 | if (cmd != ATM_SETCIRANGE) return -ENOIOCTLCMD; |
| 165 | if (copy_from_user(&ci, arg,sizeof(ci))) return -EFAULT; |
| 166 | if (ci.vpi_bits == ATM_CI_MAX) ci.vpi_bits = MAX_VPI_BITS; |
| 167 | if (ci.vci_bits == ATM_CI_MAX) ci.vci_bits = MAX_VCI_BITS; |
| 168 | if (ci.vpi_bits > MAX_VPI_BITS || ci.vpi_bits < 0 || |
| 169 | ci.vci_bits > MAX_VCI_BITS || ci.vci_bits < 0) return -EINVAL; |
| 170 | read_lock(&vcc_sklist_lock); |
| 171 | for(i = 0; i < VCC_HTABLE_SIZE; ++i) { |
| 172 | struct hlist_head *head = &vcc_hash[i]; |
| 173 | |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 174 | sk_for_each(s, head) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 175 | vcc = atm_sk(s); |
| 176 | if (vcc->dev != dev) |
| 177 | continue; |
| 178 | if ((vcc->vpi >> ci.vpi_bits) || |
| 179 | (vcc->vci >> ci.vci_bits)) { |
| 180 | read_unlock(&vcc_sklist_lock); |
| 181 | return -EBUSY; |
| 182 | } |
| 183 | } |
| 184 | } |
| 185 | read_unlock(&vcc_sklist_lock); |
| 186 | dev->ci_range = ci; |
| 187 | return 0; |
| 188 | } |
| 189 | |
| 190 | |
| 191 | static int atmtcp_v_send(struct atm_vcc *vcc,struct sk_buff *skb) |
| 192 | { |
| 193 | struct atmtcp_dev_data *dev_data; |
| 194 | struct atm_vcc *out_vcc=NULL; /* Initializer quietens GCC warning */ |
| 195 | struct sk_buff *new_skb; |
| 196 | struct atmtcp_hdr *hdr; |
| 197 | int size; |
| 198 | |
| 199 | if (vcc->qos.txtp.traffic_class == ATM_NONE) { |
| 200 | if (vcc->pop) vcc->pop(vcc,skb); |
| 201 | else dev_kfree_skb(skb); |
| 202 | return -EINVAL; |
| 203 | } |
| 204 | dev_data = PRIV(vcc->dev); |
| 205 | if (dev_data) out_vcc = dev_data->vcc; |
| 206 | if (!dev_data || !out_vcc) { |
| 207 | if (vcc->pop) vcc->pop(vcc,skb); |
| 208 | else dev_kfree_skb(skb); |
| 209 | if (dev_data) return 0; |
| 210 | atomic_inc(&vcc->stats->tx_err); |
| 211 | return -ENOLINK; |
| 212 | } |
| 213 | size = skb->len+sizeof(struct atmtcp_hdr); |
| 214 | new_skb = atm_alloc_charge(out_vcc,size,GFP_ATOMIC); |
| 215 | if (!new_skb) { |
| 216 | if (vcc->pop) vcc->pop(vcc,skb); |
| 217 | else dev_kfree_skb(skb); |
| 218 | atomic_inc(&vcc->stats->tx_err); |
| 219 | return -ENOBUFS; |
| 220 | } |
Johannes Berg | 4df864c | 2017-06-16 14:29:21 +0200 | [diff] [blame] | 221 | hdr = skb_put(new_skb, sizeof(struct atmtcp_hdr)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 222 | hdr->vpi = htons(vcc->vpi); |
| 223 | hdr->vci = htons(vcc->vci); |
| 224 | hdr->length = htonl(skb->len); |
Arnaldo Carvalho de Melo | d626f62 | 2007-03-27 18:55:52 -0300 | [diff] [blame] | 225 | skb_copy_from_linear_data(skb, skb_put(new_skb, skb->len), skb->len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 226 | if (vcc->pop) vcc->pop(vcc,skb); |
| 227 | else dev_kfree_skb(skb); |
| 228 | out_vcc->push(out_vcc,new_skb); |
| 229 | atomic_inc(&vcc->stats->tx); |
| 230 | atomic_inc(&out_vcc->stats->rx); |
| 231 | return 0; |
| 232 | } |
| 233 | |
| 234 | |
| 235 | static int atmtcp_v_proc(struct atm_dev *dev,loff_t *pos,char *page) |
| 236 | { |
| 237 | struct atmtcp_dev_data *dev_data = PRIV(dev); |
| 238 | |
| 239 | if (*pos) return 0; |
| 240 | if (!dev_data->persist) return sprintf(page,"ephemeral\n"); |
| 241 | return sprintf(page,"persistent, %sconnected\n", |
| 242 | dev_data->vcc ? "" : "dis"); |
| 243 | } |
| 244 | |
| 245 | |
| 246 | static void atmtcp_c_close(struct atm_vcc *vcc) |
| 247 | { |
| 248 | struct atm_dev *atmtcp_dev; |
| 249 | struct atmtcp_dev_data *dev_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 250 | |
| 251 | atmtcp_dev = (struct atm_dev *) vcc->dev_data; |
| 252 | dev_data = PRIV(atmtcp_dev); |
| 253 | dev_data->vcc = NULL; |
| 254 | if (dev_data->persist) return; |
| 255 | atmtcp_dev->dev_data = NULL; |
| 256 | kfree(dev_data); |
Stanislaw Gruszka | 64bf69d | 2005-11-29 16:16:41 -0800 | [diff] [blame] | 257 | atm_dev_deregister(atmtcp_dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 258 | vcc->dev_data = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 259 | module_put(THIS_MODULE); |
| 260 | } |
| 261 | |
| 262 | |
| 263 | static struct atm_vcc *find_vcc(struct atm_dev *dev, short vpi, int vci) |
| 264 | { |
| 265 | struct hlist_head *head; |
| 266 | struct atm_vcc *vcc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 267 | struct sock *s; |
| 268 | |
| 269 | head = &vcc_hash[vci & (VCC_HTABLE_SIZE -1)]; |
| 270 | |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 271 | sk_for_each(s, head) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 272 | vcc = atm_sk(s); |
| 273 | if (vcc->dev == dev && |
| 274 | vcc->vci == vci && vcc->vpi == vpi && |
| 275 | vcc->qos.rxtp.traffic_class != ATM_NONE) { |
| 276 | return vcc; |
| 277 | } |
| 278 | } |
| 279 | return NULL; |
| 280 | } |
| 281 | |
| 282 | |
| 283 | static int atmtcp_c_send(struct atm_vcc *vcc,struct sk_buff *skb) |
| 284 | { |
| 285 | struct atm_dev *dev; |
| 286 | struct atmtcp_hdr *hdr; |
| 287 | struct atm_vcc *out_vcc; |
| 288 | struct sk_buff *new_skb; |
| 289 | int result = 0; |
| 290 | |
| 291 | if (!skb->len) return 0; |
| 292 | dev = vcc->dev_data; |
| 293 | hdr = (struct atmtcp_hdr *) skb->data; |
| 294 | if (hdr->length == ATMTCP_HDR_MAGIC) { |
| 295 | result = atmtcp_recv_control( |
| 296 | (struct atmtcp_control *) skb->data); |
| 297 | goto done; |
| 298 | } |
| 299 | read_lock(&vcc_sklist_lock); |
| 300 | out_vcc = find_vcc(dev, ntohs(hdr->vpi), ntohs(hdr->vci)); |
| 301 | read_unlock(&vcc_sklist_lock); |
| 302 | if (!out_vcc) { |
Julia Lawall | e5a98fc | 2014-08-07 15:31:05 +0200 | [diff] [blame] | 303 | result = -EUNATCH; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 304 | atomic_inc(&vcc->stats->tx_err); |
| 305 | goto done; |
| 306 | } |
| 307 | skb_pull(skb,sizeof(struct atmtcp_hdr)); |
| 308 | new_skb = atm_alloc_charge(out_vcc,skb->len,GFP_KERNEL); |
| 309 | if (!new_skb) { |
| 310 | result = -ENOBUFS; |
| 311 | goto done; |
| 312 | } |
Patrick McHardy | a61bbcf | 2005-08-14 17:24:31 -0700 | [diff] [blame] | 313 | __net_timestamp(new_skb); |
Arnaldo Carvalho de Melo | d626f62 | 2007-03-27 18:55:52 -0300 | [diff] [blame] | 314 | skb_copy_from_linear_data(skb, skb_put(new_skb, skb->len), skb->len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 315 | out_vcc->push(out_vcc,new_skb); |
| 316 | atomic_inc(&vcc->stats->tx); |
| 317 | atomic_inc(&out_vcc->stats->rx); |
| 318 | done: |
| 319 | if (vcc->pop) vcc->pop(vcc,skb); |
| 320 | else dev_kfree_skb(skb); |
| 321 | return result; |
| 322 | } |
| 323 | |
| 324 | |
| 325 | /* |
| 326 | * Device operations for the virtual ATM devices created by ATMTCP. |
| 327 | */ |
| 328 | |
| 329 | |
| 330 | static struct atmdev_ops atmtcp_v_dev_ops = { |
| 331 | .dev_close = atmtcp_v_dev_close, |
| 332 | .open = atmtcp_v_open, |
| 333 | .close = atmtcp_v_close, |
| 334 | .ioctl = atmtcp_v_ioctl, |
| 335 | .send = atmtcp_v_send, |
| 336 | .proc_read = atmtcp_v_proc, |
| 337 | .owner = THIS_MODULE |
| 338 | }; |
| 339 | |
| 340 | |
| 341 | /* |
| 342 | * Device operations for the ATMTCP control device. |
| 343 | */ |
| 344 | |
| 345 | |
Bhumika Goyal | 46c4b7a | 2017-08-09 14:49:15 +0530 | [diff] [blame] | 346 | static const struct atmdev_ops atmtcp_c_dev_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 347 | .close = atmtcp_c_close, |
| 348 | .send = atmtcp_c_send |
| 349 | }; |
| 350 | |
| 351 | |
| 352 | static struct atm_dev atmtcp_control_dev = { |
| 353 | .ops = &atmtcp_c_dev_ops, |
| 354 | .type = "atmtcp", |
| 355 | .number = 999, |
Milind Arun Choudhary | 4ef8d0a | 2007-04-26 01:37:44 -0700 | [diff] [blame] | 356 | .lock = __SPIN_LOCK_UNLOCKED(atmtcp_control_dev.lock) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 357 | }; |
| 358 | |
| 359 | |
| 360 | static int atmtcp_create(int itf,int persist,struct atm_dev **result) |
| 361 | { |
| 362 | struct atmtcp_dev_data *dev_data; |
| 363 | struct atm_dev *dev; |
| 364 | |
| 365 | dev_data = kmalloc(sizeof(*dev_data),GFP_KERNEL); |
| 366 | if (!dev_data) |
| 367 | return -ENOMEM; |
| 368 | |
Dan Williams | d9ca676 | 2010-12-08 19:40:47 +0000 | [diff] [blame] | 369 | dev = atm_dev_register(DEV_LABEL,NULL,&atmtcp_v_dev_ops,itf,NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 370 | if (!dev) { |
| 371 | kfree(dev_data); |
| 372 | return itf == -1 ? -ENOMEM : -EBUSY; |
| 373 | } |
| 374 | dev->ci_range.vpi_bits = MAX_VPI_BITS; |
| 375 | dev->ci_range.vci_bits = MAX_VCI_BITS; |
| 376 | dev->dev_data = dev_data; |
| 377 | PRIV(dev)->vcc = NULL; |
| 378 | PRIV(dev)->persist = persist; |
| 379 | if (result) *result = dev; |
| 380 | return 0; |
| 381 | } |
| 382 | |
| 383 | |
| 384 | static int atmtcp_attach(struct atm_vcc *vcc,int itf) |
| 385 | { |
| 386 | struct atm_dev *dev; |
| 387 | |
| 388 | dev = NULL; |
| 389 | if (itf != -1) dev = atm_dev_lookup(itf); |
| 390 | if (dev) { |
| 391 | if (dev->ops != &atmtcp_v_dev_ops) { |
| 392 | atm_dev_put(dev); |
| 393 | return -EMEDIUMTYPE; |
| 394 | } |
Julia Lawall | b9556f9 | 2010-12-29 04:01:03 +0000 | [diff] [blame] | 395 | if (PRIV(dev)->vcc) { |
| 396 | atm_dev_put(dev); |
| 397 | return -EBUSY; |
| 398 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 399 | } |
| 400 | else { |
| 401 | int error; |
| 402 | |
| 403 | error = atmtcp_create(itf,0,&dev); |
| 404 | if (error) return error; |
| 405 | } |
| 406 | PRIV(dev)->vcc = vcc; |
| 407 | vcc->dev = &atmtcp_control_dev; |
| 408 | vcc_insert_socket(sk_atm(vcc)); |
| 409 | set_bit(ATM_VF_META,&vcc->flags); |
| 410 | set_bit(ATM_VF_READY,&vcc->flags); |
| 411 | vcc->dev_data = dev; |
| 412 | (void) atm_init_aal5(vcc); /* @@@ losing AAL in transit ... */ |
| 413 | vcc->stats = &atmtcp_control_dev.stats.aal5; |
| 414 | return dev->number; |
| 415 | } |
| 416 | |
| 417 | |
| 418 | static int atmtcp_create_persistent(int itf) |
| 419 | { |
| 420 | return atmtcp_create(itf,1,NULL); |
| 421 | } |
| 422 | |
| 423 | |
| 424 | static int atmtcp_remove_persistent(int itf) |
| 425 | { |
| 426 | struct atm_dev *dev; |
| 427 | struct atmtcp_dev_data *dev_data; |
| 428 | |
| 429 | dev = atm_dev_lookup(itf); |
| 430 | if (!dev) return -ENODEV; |
| 431 | if (dev->ops != &atmtcp_v_dev_ops) { |
| 432 | atm_dev_put(dev); |
| 433 | return -EMEDIUMTYPE; |
| 434 | } |
| 435 | dev_data = PRIV(dev); |
| 436 | if (!dev_data->persist) return 0; |
| 437 | dev_data->persist = 0; |
| 438 | if (PRIV(dev)->vcc) return 0; |
| 439 | kfree(dev_data); |
| 440 | atm_dev_put(dev); |
Stanislaw Gruszka | 64bf69d | 2005-11-29 16:16:41 -0800 | [diff] [blame] | 441 | atm_dev_deregister(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 442 | return 0; |
| 443 | } |
| 444 | |
| 445 | static int atmtcp_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) |
| 446 | { |
| 447 | int err = 0; |
| 448 | struct atm_vcc *vcc = ATM_SD(sock); |
| 449 | |
| 450 | if (cmd != SIOCSIFATMTCP && cmd != ATMTCP_CREATE && cmd != ATMTCP_REMOVE) |
| 451 | return -ENOIOCTLCMD; |
| 452 | |
| 453 | if (!capable(CAP_NET_ADMIN)) |
| 454 | return -EPERM; |
| 455 | |
| 456 | switch (cmd) { |
| 457 | case SIOCSIFATMTCP: |
| 458 | err = atmtcp_attach(vcc, (int) arg); |
| 459 | if (err >= 0) { |
| 460 | sock->state = SS_CONNECTED; |
| 461 | __module_get(THIS_MODULE); |
| 462 | } |
| 463 | break; |
| 464 | case ATMTCP_CREATE: |
| 465 | err = atmtcp_create_persistent((int) arg); |
| 466 | break; |
| 467 | case ATMTCP_REMOVE: |
| 468 | err = atmtcp_remove_persistent((int) arg); |
| 469 | break; |
| 470 | } |
| 471 | return err; |
| 472 | } |
| 473 | |
| 474 | static struct atm_ioctl atmtcp_ioctl_ops = { |
| 475 | .owner = THIS_MODULE, |
| 476 | .ioctl = atmtcp_ioctl, |
| 477 | }; |
| 478 | |
| 479 | static __init int atmtcp_init(void) |
| 480 | { |
| 481 | register_atm_ioctl(&atmtcp_ioctl_ops); |
| 482 | return 0; |
| 483 | } |
| 484 | |
| 485 | |
| 486 | static void __exit atmtcp_exit(void) |
| 487 | { |
| 488 | deregister_atm_ioctl(&atmtcp_ioctl_ops); |
| 489 | } |
| 490 | |
| 491 | MODULE_LICENSE("GPL"); |
| 492 | module_init(atmtcp_init); |
| 493 | module_exit(atmtcp_exit); |