11da177e4SLinus Torvalds /* drivers/atm/atmtcp.c - ATM over TCP "device" driver */ 21da177e4SLinus Torvalds 31da177e4SLinus Torvalds /* Written 1997-2000 by Werner Almesberger, EPFL LRC/ICA */ 41da177e4SLinus Torvalds 51da177e4SLinus Torvalds 61da177e4SLinus Torvalds #include <linux/module.h> 71da177e4SLinus Torvalds #include <linux/wait.h> 81da177e4SLinus Torvalds #include <linux/atmdev.h> 91da177e4SLinus Torvalds #include <linux/atm_tcp.h> 101da177e4SLinus Torvalds #include <linux/bitops.h> 111da177e4SLinus Torvalds #include <linux/init.h> 125a0e3ad6STejun Heo #include <linux/slab.h> 131da177e4SLinus Torvalds #include <asm/uaccess.h> 1460063497SArun Sharma #include <linux/atomic.h> 151da177e4SLinus Torvalds 161da177e4SLinus Torvalds 171da177e4SLinus Torvalds extern int atm_init_aal5(struct atm_vcc *vcc); /* "raw" AAL5 transport */ 181da177e4SLinus Torvalds 191da177e4SLinus Torvalds 201da177e4SLinus Torvalds #define PRIV(dev) ((struct atmtcp_dev_data *) ((dev)->dev_data)) 211da177e4SLinus Torvalds 221da177e4SLinus Torvalds 231da177e4SLinus Torvalds struct atmtcp_dev_data { 241da177e4SLinus Torvalds struct atm_vcc *vcc; /* control VCC; NULL if detached */ 251da177e4SLinus Torvalds int persist; /* non-zero if persistent */ 261da177e4SLinus Torvalds }; 271da177e4SLinus Torvalds 281da177e4SLinus Torvalds 291da177e4SLinus Torvalds #define DEV_LABEL "atmtcp" 301da177e4SLinus Torvalds 311da177e4SLinus Torvalds #define MAX_VPI_BITS 8 /* simplifies life */ 321da177e4SLinus Torvalds #define MAX_VCI_BITS 16 331da177e4SLinus Torvalds 341da177e4SLinus Torvalds 351da177e4SLinus Torvalds /* 361da177e4SLinus Torvalds * Hairy code ahead: the control VCC may be closed while we're still 371da177e4SLinus Torvalds * waiting for an answer, so we need to re-validate out_vcc every once 381da177e4SLinus Torvalds * in a while. 391da177e4SLinus Torvalds */ 401da177e4SLinus Torvalds 411da177e4SLinus Torvalds 421da177e4SLinus Torvalds static int atmtcp_send_control(struct atm_vcc *vcc,int type, 431da177e4SLinus Torvalds const struct atmtcp_control *msg,int flag) 441da177e4SLinus Torvalds { 451da177e4SLinus Torvalds DECLARE_WAITQUEUE(wait,current); 461da177e4SLinus Torvalds struct atm_vcc *out_vcc; 471da177e4SLinus Torvalds struct sk_buff *skb; 481da177e4SLinus Torvalds struct atmtcp_control *new_msg; 491da177e4SLinus Torvalds int old_test; 501da177e4SLinus Torvalds int error = 0; 511da177e4SLinus Torvalds 521da177e4SLinus Torvalds out_vcc = PRIV(vcc->dev) ? PRIV(vcc->dev)->vcc : NULL; 531da177e4SLinus Torvalds if (!out_vcc) return -EUNATCH; 541da177e4SLinus Torvalds skb = alloc_skb(sizeof(*msg),GFP_KERNEL); 551da177e4SLinus Torvalds if (!skb) return -ENOMEM; 561da177e4SLinus Torvalds mb(); 571da177e4SLinus Torvalds out_vcc = PRIV(vcc->dev) ? PRIV(vcc->dev)->vcc : NULL; 581da177e4SLinus Torvalds if (!out_vcc) { 591da177e4SLinus Torvalds dev_kfree_skb(skb); 601da177e4SLinus Torvalds return -EUNATCH; 611da177e4SLinus Torvalds } 621da177e4SLinus Torvalds atm_force_charge(out_vcc,skb->truesize); 631da177e4SLinus Torvalds new_msg = (struct atmtcp_control *) skb_put(skb,sizeof(*new_msg)); 641da177e4SLinus Torvalds *new_msg = *msg; 651da177e4SLinus Torvalds new_msg->hdr.length = ATMTCP_HDR_MAGIC; 661da177e4SLinus Torvalds new_msg->type = type; 671da177e4SLinus Torvalds memset(&new_msg->vcc,0,sizeof(atm_kptr_t)); 681da177e4SLinus Torvalds *(struct atm_vcc **) &new_msg->vcc = vcc; 691da177e4SLinus Torvalds old_test = test_bit(flag,&vcc->flags); 701da177e4SLinus Torvalds out_vcc->push(out_vcc,skb); 71aa395145SEric Dumazet add_wait_queue(sk_sleep(sk_atm(vcc)), &wait); 721da177e4SLinus Torvalds while (test_bit(flag,&vcc->flags) == old_test) { 731da177e4SLinus Torvalds mb(); 741da177e4SLinus Torvalds out_vcc = PRIV(vcc->dev) ? PRIV(vcc->dev)->vcc : NULL; 751da177e4SLinus Torvalds if (!out_vcc) { 761da177e4SLinus Torvalds error = -EUNATCH; 771da177e4SLinus Torvalds break; 781da177e4SLinus Torvalds } 791da177e4SLinus Torvalds set_current_state(TASK_UNINTERRUPTIBLE); 801da177e4SLinus Torvalds schedule(); 811da177e4SLinus Torvalds } 821da177e4SLinus Torvalds set_current_state(TASK_RUNNING); 83aa395145SEric Dumazet remove_wait_queue(sk_sleep(sk_atm(vcc)), &wait); 841da177e4SLinus Torvalds return error; 851da177e4SLinus Torvalds } 861da177e4SLinus Torvalds 871da177e4SLinus Torvalds 881da177e4SLinus Torvalds static int atmtcp_recv_control(const struct atmtcp_control *msg) 891da177e4SLinus Torvalds { 901da177e4SLinus Torvalds struct atm_vcc *vcc = *(struct atm_vcc **) &msg->vcc; 911da177e4SLinus Torvalds 921da177e4SLinus Torvalds vcc->vpi = msg->addr.sap_addr.vpi; 931da177e4SLinus Torvalds vcc->vci = msg->addr.sap_addr.vci; 941da177e4SLinus Torvalds vcc->qos = msg->qos; 951da177e4SLinus Torvalds sk_atm(vcc)->sk_err = -msg->result; 961da177e4SLinus Torvalds switch (msg->type) { 971da177e4SLinus Torvalds case ATMTCP_CTRL_OPEN: 981da177e4SLinus Torvalds change_bit(ATM_VF_READY,&vcc->flags); 991da177e4SLinus Torvalds break; 1001da177e4SLinus Torvalds case ATMTCP_CTRL_CLOSE: 1011da177e4SLinus Torvalds change_bit(ATM_VF_ADDR,&vcc->flags); 1021da177e4SLinus Torvalds break; 1031da177e4SLinus Torvalds default: 1041da177e4SLinus Torvalds printk(KERN_ERR "atmtcp_recv_control: unknown type %d\n", 1051da177e4SLinus Torvalds msg->type); 1061da177e4SLinus Torvalds return -EINVAL; 1071da177e4SLinus Torvalds } 108aa395145SEric Dumazet wake_up(sk_sleep(sk_atm(vcc))); 1091da177e4SLinus Torvalds return 0; 1101da177e4SLinus Torvalds } 1111da177e4SLinus Torvalds 1121da177e4SLinus Torvalds 1131da177e4SLinus Torvalds static void atmtcp_v_dev_close(struct atm_dev *dev) 1141da177e4SLinus Torvalds { 1151da177e4SLinus Torvalds /* Nothing.... Isn't this simple :-) -- REW */ 1161da177e4SLinus Torvalds } 1171da177e4SLinus Torvalds 1181da177e4SLinus Torvalds 1191da177e4SLinus Torvalds static int atmtcp_v_open(struct atm_vcc *vcc) 1201da177e4SLinus Torvalds { 1211da177e4SLinus Torvalds struct atmtcp_control msg; 1221da177e4SLinus Torvalds int error; 1231da177e4SLinus Torvalds short vpi = vcc->vpi; 1241da177e4SLinus Torvalds int vci = vcc->vci; 1251da177e4SLinus Torvalds 1261da177e4SLinus Torvalds memset(&msg,0,sizeof(msg)); 1271da177e4SLinus Torvalds msg.addr.sap_family = AF_ATMPVC; 1281da177e4SLinus Torvalds msg.hdr.vpi = htons(vpi); 1291da177e4SLinus Torvalds msg.addr.sap_addr.vpi = vpi; 1301da177e4SLinus Torvalds msg.hdr.vci = htons(vci); 1311da177e4SLinus Torvalds msg.addr.sap_addr.vci = vci; 1321da177e4SLinus Torvalds if (vpi == ATM_VPI_UNSPEC || vci == ATM_VCI_UNSPEC) return 0; 1331da177e4SLinus Torvalds msg.type = ATMTCP_CTRL_OPEN; 1341da177e4SLinus Torvalds msg.qos = vcc->qos; 1351da177e4SLinus Torvalds set_bit(ATM_VF_ADDR,&vcc->flags); 1361da177e4SLinus Torvalds clear_bit(ATM_VF_READY,&vcc->flags); /* just in case ... */ 1371da177e4SLinus Torvalds error = atmtcp_send_control(vcc,ATMTCP_CTRL_OPEN,&msg,ATM_VF_READY); 1381da177e4SLinus Torvalds if (error) return error; 1391da177e4SLinus Torvalds return -sk_atm(vcc)->sk_err; 1401da177e4SLinus Torvalds } 1411da177e4SLinus Torvalds 1421da177e4SLinus Torvalds 1431da177e4SLinus Torvalds static void atmtcp_v_close(struct atm_vcc *vcc) 1441da177e4SLinus Torvalds { 1451da177e4SLinus Torvalds struct atmtcp_control msg; 1461da177e4SLinus Torvalds 1471da177e4SLinus Torvalds memset(&msg,0,sizeof(msg)); 1481da177e4SLinus Torvalds msg.addr.sap_family = AF_ATMPVC; 1491da177e4SLinus Torvalds msg.addr.sap_addr.vpi = vcc->vpi; 1501da177e4SLinus Torvalds msg.addr.sap_addr.vci = vcc->vci; 1511da177e4SLinus Torvalds clear_bit(ATM_VF_READY,&vcc->flags); 1521da177e4SLinus Torvalds (void) atmtcp_send_control(vcc,ATMTCP_CTRL_CLOSE,&msg,ATM_VF_ADDR); 1531da177e4SLinus Torvalds } 1541da177e4SLinus Torvalds 1551da177e4SLinus Torvalds 1561da177e4SLinus Torvalds static int atmtcp_v_ioctl(struct atm_dev *dev,unsigned int cmd,void __user *arg) 1571da177e4SLinus Torvalds { 1581da177e4SLinus Torvalds struct atm_cirange ci; 1591da177e4SLinus Torvalds struct atm_vcc *vcc; 1601da177e4SLinus Torvalds struct sock *s; 1611da177e4SLinus Torvalds int i; 1621da177e4SLinus Torvalds 1631da177e4SLinus Torvalds if (cmd != ATM_SETCIRANGE) return -ENOIOCTLCMD; 1641da177e4SLinus Torvalds if (copy_from_user(&ci, arg,sizeof(ci))) return -EFAULT; 1651da177e4SLinus Torvalds if (ci.vpi_bits == ATM_CI_MAX) ci.vpi_bits = MAX_VPI_BITS; 1661da177e4SLinus Torvalds if (ci.vci_bits == ATM_CI_MAX) ci.vci_bits = MAX_VCI_BITS; 1671da177e4SLinus Torvalds if (ci.vpi_bits > MAX_VPI_BITS || ci.vpi_bits < 0 || 1681da177e4SLinus Torvalds ci.vci_bits > MAX_VCI_BITS || ci.vci_bits < 0) return -EINVAL; 1691da177e4SLinus Torvalds read_lock(&vcc_sklist_lock); 1701da177e4SLinus Torvalds for(i = 0; i < VCC_HTABLE_SIZE; ++i) { 1711da177e4SLinus Torvalds struct hlist_head *head = &vcc_hash[i]; 1721da177e4SLinus Torvalds 173b67bfe0dSSasha Levin sk_for_each(s, head) { 1741da177e4SLinus Torvalds vcc = atm_sk(s); 1751da177e4SLinus Torvalds if (vcc->dev != dev) 1761da177e4SLinus Torvalds continue; 1771da177e4SLinus Torvalds if ((vcc->vpi >> ci.vpi_bits) || 1781da177e4SLinus Torvalds (vcc->vci >> ci.vci_bits)) { 1791da177e4SLinus Torvalds read_unlock(&vcc_sklist_lock); 1801da177e4SLinus Torvalds return -EBUSY; 1811da177e4SLinus Torvalds } 1821da177e4SLinus Torvalds } 1831da177e4SLinus Torvalds } 1841da177e4SLinus Torvalds read_unlock(&vcc_sklist_lock); 1851da177e4SLinus Torvalds dev->ci_range = ci; 1861da177e4SLinus Torvalds return 0; 1871da177e4SLinus Torvalds } 1881da177e4SLinus Torvalds 1891da177e4SLinus Torvalds 1901da177e4SLinus Torvalds static int atmtcp_v_send(struct atm_vcc *vcc,struct sk_buff *skb) 1911da177e4SLinus Torvalds { 1921da177e4SLinus Torvalds struct atmtcp_dev_data *dev_data; 1931da177e4SLinus Torvalds struct atm_vcc *out_vcc=NULL; /* Initializer quietens GCC warning */ 1941da177e4SLinus Torvalds struct sk_buff *new_skb; 1951da177e4SLinus Torvalds struct atmtcp_hdr *hdr; 1961da177e4SLinus Torvalds int size; 1971da177e4SLinus Torvalds 1981da177e4SLinus Torvalds if (vcc->qos.txtp.traffic_class == ATM_NONE) { 1991da177e4SLinus Torvalds if (vcc->pop) vcc->pop(vcc,skb); 2001da177e4SLinus Torvalds else dev_kfree_skb(skb); 2011da177e4SLinus Torvalds return -EINVAL; 2021da177e4SLinus Torvalds } 2031da177e4SLinus Torvalds dev_data = PRIV(vcc->dev); 2041da177e4SLinus Torvalds if (dev_data) out_vcc = dev_data->vcc; 2051da177e4SLinus Torvalds if (!dev_data || !out_vcc) { 2061da177e4SLinus Torvalds if (vcc->pop) vcc->pop(vcc,skb); 2071da177e4SLinus Torvalds else dev_kfree_skb(skb); 2081da177e4SLinus Torvalds if (dev_data) return 0; 2091da177e4SLinus Torvalds atomic_inc(&vcc->stats->tx_err); 2101da177e4SLinus Torvalds return -ENOLINK; 2111da177e4SLinus Torvalds } 2121da177e4SLinus Torvalds size = skb->len+sizeof(struct atmtcp_hdr); 2131da177e4SLinus Torvalds new_skb = atm_alloc_charge(out_vcc,size,GFP_ATOMIC); 2141da177e4SLinus Torvalds if (!new_skb) { 2151da177e4SLinus Torvalds if (vcc->pop) vcc->pop(vcc,skb); 2161da177e4SLinus Torvalds else dev_kfree_skb(skb); 2171da177e4SLinus Torvalds atomic_inc(&vcc->stats->tx_err); 2181da177e4SLinus Torvalds return -ENOBUFS; 2191da177e4SLinus Torvalds } 2201da177e4SLinus Torvalds hdr = (void *) skb_put(new_skb,sizeof(struct atmtcp_hdr)); 2211da177e4SLinus Torvalds hdr->vpi = htons(vcc->vpi); 2221da177e4SLinus Torvalds hdr->vci = htons(vcc->vci); 2231da177e4SLinus Torvalds hdr->length = htonl(skb->len); 224d626f62bSArnaldo Carvalho de Melo skb_copy_from_linear_data(skb, skb_put(new_skb, skb->len), skb->len); 2251da177e4SLinus Torvalds if (vcc->pop) vcc->pop(vcc,skb); 2261da177e4SLinus Torvalds else dev_kfree_skb(skb); 2271da177e4SLinus Torvalds out_vcc->push(out_vcc,new_skb); 2281da177e4SLinus Torvalds atomic_inc(&vcc->stats->tx); 2291da177e4SLinus Torvalds atomic_inc(&out_vcc->stats->rx); 2301da177e4SLinus Torvalds return 0; 2311da177e4SLinus Torvalds } 2321da177e4SLinus Torvalds 2331da177e4SLinus Torvalds 2341da177e4SLinus Torvalds static int atmtcp_v_proc(struct atm_dev *dev,loff_t *pos,char *page) 2351da177e4SLinus Torvalds { 2361da177e4SLinus Torvalds struct atmtcp_dev_data *dev_data = PRIV(dev); 2371da177e4SLinus Torvalds 2381da177e4SLinus Torvalds if (*pos) return 0; 2391da177e4SLinus Torvalds if (!dev_data->persist) return sprintf(page,"ephemeral\n"); 2401da177e4SLinus Torvalds return sprintf(page,"persistent, %sconnected\n", 2411da177e4SLinus Torvalds dev_data->vcc ? "" : "dis"); 2421da177e4SLinus Torvalds } 2431da177e4SLinus Torvalds 2441da177e4SLinus Torvalds 2451da177e4SLinus Torvalds static void atmtcp_c_close(struct atm_vcc *vcc) 2461da177e4SLinus Torvalds { 2471da177e4SLinus Torvalds struct atm_dev *atmtcp_dev; 2481da177e4SLinus Torvalds struct atmtcp_dev_data *dev_data; 2491da177e4SLinus Torvalds 2501da177e4SLinus Torvalds atmtcp_dev = (struct atm_dev *) vcc->dev_data; 2511da177e4SLinus Torvalds dev_data = PRIV(atmtcp_dev); 2521da177e4SLinus Torvalds dev_data->vcc = NULL; 2531da177e4SLinus Torvalds if (dev_data->persist) return; 2541da177e4SLinus Torvalds atmtcp_dev->dev_data = NULL; 2551da177e4SLinus Torvalds kfree(dev_data); 25664bf69ddSStanislaw Gruszka atm_dev_deregister(atmtcp_dev); 2571da177e4SLinus Torvalds vcc->dev_data = NULL; 2581da177e4SLinus Torvalds module_put(THIS_MODULE); 2591da177e4SLinus Torvalds } 2601da177e4SLinus Torvalds 2611da177e4SLinus Torvalds 2621da177e4SLinus Torvalds static struct atm_vcc *find_vcc(struct atm_dev *dev, short vpi, int vci) 2631da177e4SLinus Torvalds { 2641da177e4SLinus Torvalds struct hlist_head *head; 2651da177e4SLinus Torvalds struct atm_vcc *vcc; 2661da177e4SLinus Torvalds struct sock *s; 2671da177e4SLinus Torvalds 2681da177e4SLinus Torvalds head = &vcc_hash[vci & (VCC_HTABLE_SIZE -1)]; 2691da177e4SLinus Torvalds 270b67bfe0dSSasha Levin sk_for_each(s, head) { 2711da177e4SLinus Torvalds vcc = atm_sk(s); 2721da177e4SLinus Torvalds if (vcc->dev == dev && 2731da177e4SLinus Torvalds vcc->vci == vci && vcc->vpi == vpi && 2741da177e4SLinus Torvalds vcc->qos.rxtp.traffic_class != ATM_NONE) { 2751da177e4SLinus Torvalds return vcc; 2761da177e4SLinus Torvalds } 2771da177e4SLinus Torvalds } 2781da177e4SLinus Torvalds return NULL; 2791da177e4SLinus Torvalds } 2801da177e4SLinus Torvalds 2811da177e4SLinus Torvalds 2821da177e4SLinus Torvalds static int atmtcp_c_send(struct atm_vcc *vcc,struct sk_buff *skb) 2831da177e4SLinus Torvalds { 2841da177e4SLinus Torvalds struct atm_dev *dev; 2851da177e4SLinus Torvalds struct atmtcp_hdr *hdr; 2861da177e4SLinus Torvalds struct atm_vcc *out_vcc; 2871da177e4SLinus Torvalds struct sk_buff *new_skb; 2881da177e4SLinus Torvalds int result = 0; 2891da177e4SLinus Torvalds 2901da177e4SLinus Torvalds if (!skb->len) return 0; 2911da177e4SLinus Torvalds dev = vcc->dev_data; 2921da177e4SLinus Torvalds hdr = (struct atmtcp_hdr *) skb->data; 2931da177e4SLinus Torvalds if (hdr->length == ATMTCP_HDR_MAGIC) { 2941da177e4SLinus Torvalds result = atmtcp_recv_control( 2951da177e4SLinus Torvalds (struct atmtcp_control *) skb->data); 2961da177e4SLinus Torvalds goto done; 2971da177e4SLinus Torvalds } 2981da177e4SLinus Torvalds read_lock(&vcc_sklist_lock); 2991da177e4SLinus Torvalds out_vcc = find_vcc(dev, ntohs(hdr->vpi), ntohs(hdr->vci)); 3001da177e4SLinus Torvalds read_unlock(&vcc_sklist_lock); 3011da177e4SLinus Torvalds if (!out_vcc) { 3021da177e4SLinus Torvalds atomic_inc(&vcc->stats->tx_err); 3031da177e4SLinus Torvalds goto done; 3041da177e4SLinus Torvalds } 3051da177e4SLinus Torvalds skb_pull(skb,sizeof(struct atmtcp_hdr)); 3061da177e4SLinus Torvalds new_skb = atm_alloc_charge(out_vcc,skb->len,GFP_KERNEL); 3071da177e4SLinus Torvalds if (!new_skb) { 3081da177e4SLinus Torvalds result = -ENOBUFS; 3091da177e4SLinus Torvalds goto done; 3101da177e4SLinus Torvalds } 311a61bbcf2SPatrick McHardy __net_timestamp(new_skb); 312d626f62bSArnaldo Carvalho de Melo skb_copy_from_linear_data(skb, skb_put(new_skb, skb->len), skb->len); 3131da177e4SLinus Torvalds out_vcc->push(out_vcc,new_skb); 3141da177e4SLinus Torvalds atomic_inc(&vcc->stats->tx); 3151da177e4SLinus Torvalds atomic_inc(&out_vcc->stats->rx); 3161da177e4SLinus Torvalds done: 3171da177e4SLinus Torvalds if (vcc->pop) vcc->pop(vcc,skb); 3181da177e4SLinus Torvalds else dev_kfree_skb(skb); 3191da177e4SLinus Torvalds return result; 3201da177e4SLinus Torvalds } 3211da177e4SLinus Torvalds 3221da177e4SLinus Torvalds 3231da177e4SLinus Torvalds /* 3241da177e4SLinus Torvalds * Device operations for the virtual ATM devices created by ATMTCP. 3251da177e4SLinus Torvalds */ 3261da177e4SLinus Torvalds 3271da177e4SLinus Torvalds 3281da177e4SLinus Torvalds static struct atmdev_ops atmtcp_v_dev_ops = { 3291da177e4SLinus Torvalds .dev_close = atmtcp_v_dev_close, 3301da177e4SLinus Torvalds .open = atmtcp_v_open, 3311da177e4SLinus Torvalds .close = atmtcp_v_close, 3321da177e4SLinus Torvalds .ioctl = atmtcp_v_ioctl, 3331da177e4SLinus Torvalds .send = atmtcp_v_send, 3341da177e4SLinus Torvalds .proc_read = atmtcp_v_proc, 3351da177e4SLinus Torvalds .owner = THIS_MODULE 3361da177e4SLinus Torvalds }; 3371da177e4SLinus Torvalds 3381da177e4SLinus Torvalds 3391da177e4SLinus Torvalds /* 3401da177e4SLinus Torvalds * Device operations for the ATMTCP control device. 3411da177e4SLinus Torvalds */ 3421da177e4SLinus Torvalds 3431da177e4SLinus Torvalds 3441da177e4SLinus Torvalds static struct atmdev_ops atmtcp_c_dev_ops = { 3451da177e4SLinus Torvalds .close = atmtcp_c_close, 3461da177e4SLinus Torvalds .send = atmtcp_c_send 3471da177e4SLinus Torvalds }; 3481da177e4SLinus Torvalds 3491da177e4SLinus Torvalds 3501da177e4SLinus Torvalds static struct atm_dev atmtcp_control_dev = { 3511da177e4SLinus Torvalds .ops = &atmtcp_c_dev_ops, 3521da177e4SLinus Torvalds .type = "atmtcp", 3531da177e4SLinus Torvalds .number = 999, 3544ef8d0aeSMilind Arun Choudhary .lock = __SPIN_LOCK_UNLOCKED(atmtcp_control_dev.lock) 3551da177e4SLinus Torvalds }; 3561da177e4SLinus Torvalds 3571da177e4SLinus Torvalds 3581da177e4SLinus Torvalds static int atmtcp_create(int itf,int persist,struct atm_dev **result) 3591da177e4SLinus Torvalds { 3601da177e4SLinus Torvalds struct atmtcp_dev_data *dev_data; 3611da177e4SLinus Torvalds struct atm_dev *dev; 3621da177e4SLinus Torvalds 3631da177e4SLinus Torvalds dev_data = kmalloc(sizeof(*dev_data),GFP_KERNEL); 3641da177e4SLinus Torvalds if (!dev_data) 3651da177e4SLinus Torvalds return -ENOMEM; 3661da177e4SLinus Torvalds 367d9ca676bSDan Williams dev = atm_dev_register(DEV_LABEL,NULL,&atmtcp_v_dev_ops,itf,NULL); 3681da177e4SLinus Torvalds if (!dev) { 3691da177e4SLinus Torvalds kfree(dev_data); 3701da177e4SLinus Torvalds return itf == -1 ? -ENOMEM : -EBUSY; 3711da177e4SLinus Torvalds } 3721da177e4SLinus Torvalds dev->ci_range.vpi_bits = MAX_VPI_BITS; 3731da177e4SLinus Torvalds dev->ci_range.vci_bits = MAX_VCI_BITS; 3741da177e4SLinus Torvalds dev->dev_data = dev_data; 3751da177e4SLinus Torvalds PRIV(dev)->vcc = NULL; 3761da177e4SLinus Torvalds PRIV(dev)->persist = persist; 3771da177e4SLinus Torvalds if (result) *result = dev; 3781da177e4SLinus Torvalds return 0; 3791da177e4SLinus Torvalds } 3801da177e4SLinus Torvalds 3811da177e4SLinus Torvalds 3821da177e4SLinus Torvalds static int atmtcp_attach(struct atm_vcc *vcc,int itf) 3831da177e4SLinus Torvalds { 3841da177e4SLinus Torvalds struct atm_dev *dev; 3851da177e4SLinus Torvalds 3861da177e4SLinus Torvalds dev = NULL; 3871da177e4SLinus Torvalds if (itf != -1) dev = atm_dev_lookup(itf); 3881da177e4SLinus Torvalds if (dev) { 3891da177e4SLinus Torvalds if (dev->ops != &atmtcp_v_dev_ops) { 3901da177e4SLinus Torvalds atm_dev_put(dev); 3911da177e4SLinus Torvalds return -EMEDIUMTYPE; 3921da177e4SLinus Torvalds } 393b9556f9aSJulia Lawall if (PRIV(dev)->vcc) { 394b9556f9aSJulia Lawall atm_dev_put(dev); 395b9556f9aSJulia Lawall return -EBUSY; 396b9556f9aSJulia Lawall } 3971da177e4SLinus Torvalds } 3981da177e4SLinus Torvalds else { 3991da177e4SLinus Torvalds int error; 4001da177e4SLinus Torvalds 4011da177e4SLinus Torvalds error = atmtcp_create(itf,0,&dev); 4021da177e4SLinus Torvalds if (error) return error; 4031da177e4SLinus Torvalds } 4041da177e4SLinus Torvalds PRIV(dev)->vcc = vcc; 4051da177e4SLinus Torvalds vcc->dev = &atmtcp_control_dev; 4061da177e4SLinus Torvalds vcc_insert_socket(sk_atm(vcc)); 4071da177e4SLinus Torvalds set_bit(ATM_VF_META,&vcc->flags); 4081da177e4SLinus Torvalds set_bit(ATM_VF_READY,&vcc->flags); 4091da177e4SLinus Torvalds vcc->dev_data = dev; 4101da177e4SLinus Torvalds (void) atm_init_aal5(vcc); /* @@@ losing AAL in transit ... */ 4111da177e4SLinus Torvalds vcc->stats = &atmtcp_control_dev.stats.aal5; 4121da177e4SLinus Torvalds return dev->number; 4131da177e4SLinus Torvalds } 4141da177e4SLinus Torvalds 4151da177e4SLinus Torvalds 4161da177e4SLinus Torvalds static int atmtcp_create_persistent(int itf) 4171da177e4SLinus Torvalds { 4181da177e4SLinus Torvalds return atmtcp_create(itf,1,NULL); 4191da177e4SLinus Torvalds } 4201da177e4SLinus Torvalds 4211da177e4SLinus Torvalds 4221da177e4SLinus Torvalds static int atmtcp_remove_persistent(int itf) 4231da177e4SLinus Torvalds { 4241da177e4SLinus Torvalds struct atm_dev *dev; 4251da177e4SLinus Torvalds struct atmtcp_dev_data *dev_data; 4261da177e4SLinus Torvalds 4271da177e4SLinus Torvalds dev = atm_dev_lookup(itf); 4281da177e4SLinus Torvalds if (!dev) return -ENODEV; 4291da177e4SLinus Torvalds if (dev->ops != &atmtcp_v_dev_ops) { 4301da177e4SLinus Torvalds atm_dev_put(dev); 4311da177e4SLinus Torvalds return -EMEDIUMTYPE; 4321da177e4SLinus Torvalds } 4331da177e4SLinus Torvalds dev_data = PRIV(dev); 4341da177e4SLinus Torvalds if (!dev_data->persist) return 0; 4351da177e4SLinus Torvalds dev_data->persist = 0; 4361da177e4SLinus Torvalds if (PRIV(dev)->vcc) return 0; 4371da177e4SLinus Torvalds kfree(dev_data); 4381da177e4SLinus Torvalds atm_dev_put(dev); 43964bf69ddSStanislaw Gruszka atm_dev_deregister(dev); 4401da177e4SLinus Torvalds return 0; 4411da177e4SLinus Torvalds } 4421da177e4SLinus Torvalds 4431da177e4SLinus Torvalds static int atmtcp_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 4441da177e4SLinus Torvalds { 4451da177e4SLinus Torvalds int err = 0; 4461da177e4SLinus Torvalds struct atm_vcc *vcc = ATM_SD(sock); 4471da177e4SLinus Torvalds 4481da177e4SLinus Torvalds if (cmd != SIOCSIFATMTCP && cmd != ATMTCP_CREATE && cmd != ATMTCP_REMOVE) 4491da177e4SLinus Torvalds return -ENOIOCTLCMD; 4501da177e4SLinus Torvalds 4511da177e4SLinus Torvalds if (!capable(CAP_NET_ADMIN)) 4521da177e4SLinus Torvalds return -EPERM; 4531da177e4SLinus Torvalds 4541da177e4SLinus Torvalds switch (cmd) { 4551da177e4SLinus Torvalds case SIOCSIFATMTCP: 4561da177e4SLinus Torvalds err = atmtcp_attach(vcc, (int) arg); 4571da177e4SLinus Torvalds if (err >= 0) { 4581da177e4SLinus Torvalds sock->state = SS_CONNECTED; 4591da177e4SLinus Torvalds __module_get(THIS_MODULE); 4601da177e4SLinus Torvalds } 4611da177e4SLinus Torvalds break; 4621da177e4SLinus Torvalds case ATMTCP_CREATE: 4631da177e4SLinus Torvalds err = atmtcp_create_persistent((int) arg); 4641da177e4SLinus Torvalds break; 4651da177e4SLinus Torvalds case ATMTCP_REMOVE: 4661da177e4SLinus Torvalds err = atmtcp_remove_persistent((int) arg); 4671da177e4SLinus Torvalds break; 4681da177e4SLinus Torvalds } 4691da177e4SLinus Torvalds return err; 4701da177e4SLinus Torvalds } 4711da177e4SLinus Torvalds 4721da177e4SLinus Torvalds static struct atm_ioctl atmtcp_ioctl_ops = { 4731da177e4SLinus Torvalds .owner = THIS_MODULE, 4741da177e4SLinus Torvalds .ioctl = atmtcp_ioctl, 4751da177e4SLinus Torvalds }; 4761da177e4SLinus Torvalds 4771da177e4SLinus Torvalds static __init int atmtcp_init(void) 4781da177e4SLinus Torvalds { 4791da177e4SLinus Torvalds register_atm_ioctl(&atmtcp_ioctl_ops); 4801da177e4SLinus Torvalds return 0; 4811da177e4SLinus Torvalds } 4821da177e4SLinus Torvalds 4831da177e4SLinus Torvalds 4841da177e4SLinus Torvalds static void __exit atmtcp_exit(void) 4851da177e4SLinus Torvalds { 4861da177e4SLinus Torvalds deregister_atm_ioctl(&atmtcp_ioctl_ops); 4871da177e4SLinus Torvalds } 4881da177e4SLinus Torvalds 4891da177e4SLinus Torvalds MODULE_LICENSE("GPL"); 4901da177e4SLinus Torvalds module_init(atmtcp_init); 4911da177e4SLinus Torvalds module_exit(atmtcp_exit); 492