cregit-Linux how code gets into the kernel

Release 4.11 net/atm/common.c

Directory: net/atm
/* net/atm/common.c - ATM sockets (common part for PVC and SVC) */

/* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */


#define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__

#include <linux/module.h>
#include <linux/kmod.h>
#include <linux/net.h>		/* struct socket, struct proto_ops */
#include <linux/atm.h>		/* ATM stuff */
#include <linux/atmdev.h>
#include <linux/socket.h>	/* SOL_SOCKET */
#include <linux/errno.h>	/* error codes */
#include <linux/capability.h>
#include <linux/mm.h>
#include <linux/sched/signal.h>
#include <linux/time.h>		/* struct timeval */
#include <linux/skbuff.h>
#include <linux/bitops.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <net/sock.h>		/* struct sock */
#include <linux/uaccess.h>
#include <linux/poll.h>

#include <linux/atomic.h>

#include "resources.h"		/* atm_find_dev */
#include "common.h"		/* prototypes */
#include "protocols.h"		/* atm_init_<transport> */
#include "addr.h"		/* address registry */
#include "signaling.h"		/* for WAITING and sigd_attach */


struct hlist_head vcc_hash[VCC_HTABLE_SIZE];

EXPORT_SYMBOL(vcc_hash);


DEFINE_RWLOCK(vcc_sklist_lock);

EXPORT_SYMBOL(vcc_sklist_lock);

static ATOMIC_NOTIFIER_HEAD(atm_dev_notify_chain);


static void __vcc_insert_socket(struct sock *sk) { struct atm_vcc *vcc = atm_sk(sk); struct hlist_head *head = &vcc_hash[vcc->vci & (VCC_HTABLE_SIZE - 1)]; sk->sk_hash = vcc->vci & (VCC_HTABLE_SIZE - 1); sk_add_node(sk, head); }

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Chas Williams6098.36%480.00%
Eric Dumazet11.64%120.00%
Total61100.00%5100.00%


void vcc_insert_socket(struct sock *sk) { write_lock_irq(&vcc_sklist_lock); __vcc_insert_socket(sk); write_unlock_irq(&vcc_sklist_lock); }

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Chas Williams27100.00%2100.00%
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EXPORT_SYMBOL(vcc_insert_socket);
static void vcc_remove_socket(struct sock *sk) { write_lock_irq(&vcc_sklist_lock); sk_del_node_init(sk); write_unlock_irq(&vcc_sklist_lock); }

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Chas Williams2796.43%266.67%
Christoph Hellwig13.57%133.33%
Total28100.00%3100.00%


static struct sk_buff *alloc_tx(struct atm_vcc *vcc, unsigned int size) { struct sk_buff *skb; struct sock *sk = sk_atm(vcc); if (sk_wmem_alloc_get(sk) && !atm_may_send(vcc, size)) { pr_debug("Sorry: wmem_alloc = %d, size = %d, sndbuf = %d\n", sk_wmem_alloc_get(sk), size, sk->sk_sndbuf); return NULL; } while (!(skb = alloc_skb(size, GFP_KERNEL))) schedule(); pr_debug("%d += %d\n", sk_wmem_alloc_get(sk), skb->truesize); atomic_add(skb->truesize, &sk->sk_wmem_alloc); return skb; }

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PersonTokensPropCommitsCommitProp
Chas Williams9885.96%233.33%
Arnaldo Carvalho de Melo108.77%116.67%
Eric Dumazet32.63%116.67%
Stephen Hemminger21.75%116.67%
Joe Perches10.88%116.67%
Total114100.00%6100.00%


static void vcc_sock_destruct(struct sock *sk) { if (atomic_read(&sk->sk_rmem_alloc)) printk(KERN_DEBUG "%s: rmem leakage (%d bytes) detected.\n", __func__, atomic_read(&sk->sk_rmem_alloc)); if (atomic_read(&sk->sk_wmem_alloc)) printk(KERN_DEBUG "%s: wmem leakage (%d bytes) detected.\n", __func__, atomic_read(&sk->sk_wmem_alloc)); }

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Chas Williams5790.48%266.67%
Joe Perches69.52%133.33%
Total63100.00%3100.00%


static void vcc_def_wakeup(struct sock *sk) { struct socket_wq *wq; rcu_read_lock(); wq = rcu_dereference(sk->sk_wq); if (skwq_has_sleeper(wq)) wake_up(&wq->wait); rcu_read_unlock(); }

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Chas Williams2758.70%250.00%
Eric Dumazet1839.13%125.00%
Herbert Xu12.17%125.00%
Total46100.00%4100.00%


static inline int vcc_writable(struct sock *sk) { struct atm_vcc *vcc = atm_sk(sk); return (vcc->qos.txtp.max_sdu + atomic_read(&sk->sk_wmem_alloc)) <= sk->sk_sndbuf; }

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Chas Williams4088.89%266.67%
Linus Torvalds511.11%133.33%
Total45100.00%3100.00%


static void vcc_write_space(struct sock *sk) { struct socket_wq *wq; rcu_read_lock(); if (vcc_writable(sk)) { wq = rcu_dereference(sk->sk_wq); if (skwq_has_sleeper(wq)) wake_up_interruptible(&wq->wait); sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT); } rcu_read_unlock(); }

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Chas Williams3757.81%450.00%
Eric Dumazet2335.94%112.50%
Linus Torvalds23.12%112.50%
Pavel Emelyanov11.56%112.50%
Herbert Xu11.56%112.50%
Total64100.00%8100.00%


static void vcc_release_cb(struct sock *sk) { struct atm_vcc *vcc = atm_sk(sk); if (vcc->release_cb) vcc->release_cb(vcc); }

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David Woodhouse34100.00%1100.00%
Total34100.00%1100.00%

static struct proto vcc_proto = { .name = "VCC", .owner = THIS_MODULE, .obj_size = sizeof(struct atm_vcc), .release_cb = vcc_release_cb, };
int vcc_create(struct net *net, struct socket *sock, int protocol, int family, int kern) { struct sock *sk; struct atm_vcc *vcc; sock->sk = NULL; if (sock->type == SOCK_STREAM) return -EINVAL; sk = sk_alloc(net, family, GFP_KERNEL, &vcc_proto, kern); if (!sk) return -ENOMEM; sock_init_data(sock, sk); sk->sk_state_change = vcc_def_wakeup; sk->sk_write_space = vcc_write_space; vcc = atm_sk(sk); vcc->dev = NULL; memset(&vcc->local, 0, sizeof(struct sockaddr_atmsvc)); memset(&vcc->remote, 0, sizeof(struct sockaddr_atmsvc)); vcc->qos.txtp.max_sdu = 1 << 16; /* for meta VCs */ atomic_set(&sk->sk_wmem_alloc, 1); atomic_set(&sk->sk_rmem_alloc, 0); vcc->push = NULL; vcc->pop = NULL; vcc->owner = NULL; vcc->push_oam = NULL; vcc->release_cb = NULL; vcc->vpi = vcc->vci = 0; /* no VCI/VPI yet */ vcc->atm_options = vcc->aal_options = 0; sk->sk_destruct = vcc_sock_destruct; return 0; }

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Chas Williams18378.21%640.00%
Linus Torvalds (pre-git)239.83%213.33%
Eric W. Biedermann125.13%213.33%
David Woodhouse62.56%16.67%
Krzysztof Mazur62.56%16.67%
Arnaldo Carvalho de Melo31.28%213.33%
Eric Dumazet10.43%16.67%
Total234100.00%15100.00%


static void vcc_destroy_socket(struct sock *sk) { struct atm_vcc *vcc = atm_sk(sk); struct sk_buff *skb; set_bit(ATM_VF_CLOSE, &vcc->flags); clear_bit(ATM_VF_READY, &vcc->flags); if (vcc->dev) { if (vcc->dev->ops->close) vcc->dev->ops->close(vcc); if (vcc->push) vcc->push(vcc, NULL); /* atmarpd has no push */ module_put(vcc->owner); while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) { atm_return(vcc, skb->truesize); kfree_skb(skb); } module_put(vcc->dev->ops->owner); atm_dev_put(vcc->dev); } vcc_remove_socket(sk); }

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PersonTokensPropCommitsCommitProp
Chas Williams9260.13%666.67%
Linus Torvalds (pre-git)5435.29%222.22%
Krzysztof Mazur74.58%111.11%
Total153100.00%9100.00%


int vcc_release(struct socket *sock) { struct sock *sk = sock->sk; if (sk) { lock_sock(sk); vcc_destroy_socket(sock->sk); release_sock(sk); sock_put(sk); } return 0; }

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Chas Williams4284.00%266.67%
Linus Torvalds (pre-git)816.00%133.33%
Total50100.00%3100.00%


void vcc_release_async(struct atm_vcc *vcc, int reply) { struct sock *sk = sk_atm(vcc); set_bit(ATM_VF_CLOSE, &vcc->flags); sk->sk_shutdown |= RCV_SHUTDOWN; sk->sk_err = -reply; clear_bit(ATM_VF_WAITING, &vcc->flags); sk->sk_state_change(sk); }

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Chas Williams5384.13%266.67%
Arnaldo Carvalho de Melo1015.87%133.33%
Total63100.00%3100.00%

EXPORT_SYMBOL(vcc_release_async);
void vcc_process_recv_queue(struct atm_vcc *vcc) { struct sk_buff_head queue, *rq; struct sk_buff *skb, *tmp; unsigned long flags; __skb_queue_head_init(&queue); rq = &sk_atm(vcc)->sk_receive_queue; spin_lock_irqsave(&rq->lock, flags); skb_queue_splice_init(rq, &queue); spin_unlock_irqrestore(&rq->lock, flags); skb_queue_walk_safe(&queue, skb, tmp) { __skb_unlink(skb, &queue); vcc->push(vcc, skb); } }

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Jorge Boncompte100100.00%1100.00%
Total100100.00%1100.00%

EXPORT_SYMBOL(vcc_process_recv_queue);
void atm_dev_signal_change(struct atm_dev *dev, char signal) { pr_debug("%s signal=%d dev=%p number=%d dev->signal=%d\n", __func__, signal, dev, dev->number, dev->signal); /* atm driver sending invalid signal */ WARN_ON(signal < ATM_PHY_SIG_LOST || signal > ATM_PHY_SIG_FOUND); if (dev->signal == signal) return; /* no change */ dev->signal = signal; atomic_notifier_call_chain(&atm_dev_notify_chain, signal, dev); }

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Karl Hiramoto70100.00%1100.00%
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EXPORT_SYMBOL(atm_dev_signal_change);
void atm_dev_release_vccs(struct atm_dev *dev) { int i; write_lock_irq(&vcc_sklist_lock); for (i = 0; i < VCC_HTABLE_SIZE; i++) { struct hlist_head *head = &vcc_hash[i]; struct hlist_node *tmp; struct sock *s; struct atm_vcc *vcc; sk_for_each_safe(s, tmp, head) { vcc = atm_sk(s); if (vcc->dev == dev) { vcc_release_async(vcc, -EPIPE); sk_del_node_init(s); } } } write_unlock_irq(&vcc_sklist_lock); }

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Stanislaw W. Gruszka106100.00%1100.00%
Total106100.00%1100.00%

EXPORT_SYMBOL(atm_dev_release_vccs);
static int adjust_tp(struct atm_trafprm *tp, unsigned char aal) { int max_sdu; if (!tp->traffic_class) return 0; switch (aal) { case ATM_AAL0: max_sdu = ATM_CELL_SIZE-1; break; case ATM_AAL34: max_sdu = ATM_MAX_AAL34_PDU; break; default: pr_warn("AAL problems ... (%d)\n", aal); /* fall through */ case ATM_AAL5: max_sdu = ATM_MAX_AAL5_PDU; } if (!tp->max_sdu) tp->max_sdu = max_sdu; else if (tp->max_sdu > max_sdu) return -EINVAL; if (!tp->max_cdv) tp->max_cdv = ATM_MAX_CDV; return 0; }

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Chas Williams8678.18%240.00%
Linus Torvalds (pre-git)2220.00%120.00%
Joe Perches21.82%240.00%
Total110100.00%5100.00%


static int check_ci(const struct atm_vcc *vcc, short vpi, int vci) { struct hlist_head *head = &vcc_hash[vci & (VCC_HTABLE_SIZE - 1)]; struct sock *s; struct atm_vcc *walk; sk_for_each(s, head) { walk = atm_sk(s); if (walk->dev != vcc->dev) continue; if (test_bit(ATM_VF_ADDR, &walk->flags) && walk->vpi == vpi && walk->vci == vci && ((walk->qos.txtp.traffic_class != ATM_NONE && vcc->qos.txtp.traffic_class != ATM_NONE) || (walk->qos.rxtp.traffic_class != ATM_NONE && vcc->qos.rxtp.traffic_class != ATM_NONE))) return -EADDRINUSE; } /* allow VCCs with same VPI/VCI iff they don't collide on TX/RX (but we may refuse such sharing for other reasons, e.g. if protocol requires to have both channels) */ return 0; }

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Chas Williams14899.33%266.67%
Mitchell Blank Jr.10.67%133.33%
Total149100.00%3100.00%


static int find_ci(const struct atm_vcc *vcc, short *vpi, int *vci) { static short p; /* poor man's per-device cache */ static int c; short old_p; int old_c; int err; if (*vpi != ATM_VPI_ANY && *vci != ATM_VCI_ANY) { err = check_ci(vcc, *vpi, *vci); return err; } /* last scan may have left values out of bounds for current device */ if (*vpi != ATM_VPI_ANY) p = *vpi; else if (p >= 1 << vcc->dev->ci_range.vpi_bits) p = 0; if (*vci != ATM_VCI_ANY) c = *vci; else if (c < ATM_NOT_RSV_VCI || c >= 1 << vcc->dev->ci_range.vci_bits) c = ATM_NOT_RSV_VCI; old_p = p; old_c = c; do { if (!check_ci(vcc, p, c)) { *vpi = p; *vci = c; return 0; } if (*vci == ATM_VCI_ANY) { c++; if (c >= 1 << vcc->dev->ci_range.vci_bits) c = ATM_NOT_RSV_VCI; } if ((c == ATM_NOT_RSV_VCI || *vci != ATM_VCI_ANY) && *vpi == ATM_VPI_ANY) { p++; if (p >= 1 << vcc->dev->ci_range.vpi_bits) p = 0; } } while (old_p != p || old_c != c); return -EADDRINUSE; }

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Chas Williams25899.61%150.00%
Mitchell Blank Jr.10.39%150.00%
Total259100.00%2100.00%


static int __vcc_connect(struct atm_vcc *vcc, struct atm_dev *dev, short vpi, int vci) { struct sock *sk = sk_atm(vcc); int error; if ((vpi != ATM_VPI_UNSPEC && vpi != ATM_VPI_ANY && vpi >> dev->ci_range.vpi_bits) || (vci != ATM_VCI_UNSPEC && vci != ATM_VCI_ANY && vci >> dev->ci_range.vci_bits)) return -EINVAL; if (vci > 0 && vci < ATM_NOT_RSV_VCI && !capable(CAP_NET_BIND_SERVICE)) return -EPERM; error = -ENODEV; if (!try_module_get(dev->ops->owner)) return error; vcc->dev = dev; write_lock_irq(&vcc_sklist_lock); if (test_bit(ATM_DF_REMOVED, &dev->flags) || (error = find_ci(vcc, &vpi, &vci))) { write_unlock_irq(&vcc_sklist_lock); goto fail_module_put; } vcc->vpi = vpi; vcc->vci = vci; __vcc_insert_socket(sk); write_unlock_irq(&vcc_sklist_lock); switch (vcc->qos.aal) { case ATM_AAL0: error = atm_init_aal0(vcc); vcc->stats = &dev->stats.aal0; break; case ATM_AAL34: error = atm_init_aal34(vcc); vcc->stats = &dev->stats.aal34; break; case ATM_NO_AAL: /* ATM_AAL5 is also used in the "0 for default" case */ vcc->qos.aal = ATM_AAL5; /* fall through */ case ATM_AAL5: error = atm_init_aal5(vcc); vcc->stats = &dev->stats.aal5; break; default: error = -EPROTOTYPE; } if (!error) error = adjust_tp(&vcc->qos.txtp, vcc->qos.aal); if (!error) error = adjust_tp(&vcc->qos.rxtp, vcc->qos.aal); if (error) goto fail; pr_debug("VCC %d.%d, AAL %d\n", vpi, vci, vcc->qos.aal); pr_debug(" TX: %d, PCR %d..%d, SDU %d\n", vcc->qos.txtp.traffic_class, vcc->qos.txtp.min_pcr, vcc->qos.txtp.max_pcr, vcc->qos.txtp.max_sdu); pr_debug(" RX: %d, PCR %d..%d, SDU %d\n", vcc->qos.rxtp.traffic_class, vcc->qos.rxtp.min_pcr, vcc->qos.rxtp.max_pcr, vcc->qos.rxtp.max_sdu); if (dev->ops->open) { error = dev->ops->open(vcc); if (error) goto fail; } return 0; fail: vcc_remove_socket(sk); fail_module_put: module_put(dev->ops->owner); /* ensure we get dev module ref count correct */ vcc->dev = NULL; return error; }

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PersonTokensPropCommitsCommitProp
Chas Williams36675.31%642.86%
Linus Torvalds (pre-git)9018.52%428.57%
Stanislaw W. Gruszka132.67%17.14%
Arnaldo Carvalho de Melo102.06%17.14%
Joe Perches40.82%17.14%
Stephen Hemminger30.62%17.14%
Total486100.00%14100.00%


int vcc_connect(struct socket *sock, int itf, short vpi, int vci) { struct atm_dev *dev; struct atm_vcc *vcc = ATM_SD(sock); int error; pr_debug("(vpi %d, vci %d)\n", vpi, vci); if (sock->state == SS_CONNECTED) return -EISCONN; if (sock->state != SS_UNCONNECTED) return -EINVAL; if (!(vpi || vci)) return -EINVAL; if (vpi != ATM_VPI_UNSPEC && vci != ATM_VCI_UNSPEC) clear_bit(ATM_VF_PARTIAL, &vcc->flags); else if (test_bit(ATM_VF_PARTIAL, &vcc->flags)) return -EINVAL; pr_debug("(TX: cl %d,bw %d-%d,sdu %d; " "RX: cl %d,bw %d-%d,sdu %d,AAL %s%d)\n", vcc->qos.txtp.traffic_class, vcc->qos.txtp.min_pcr, vcc->qos.txtp.max_pcr, vcc->qos.txtp.max_sdu, vcc->qos.rxtp.traffic_class, vcc->qos.rxtp.min_pcr, vcc->qos.rxtp.max_pcr, vcc->qos.rxtp.max_sdu, vcc->qos.aal == ATM_AAL5 ? "" : vcc->qos.aal == ATM_AAL0 ? "" : " ??? code ", vcc->qos.aal == ATM_AAL0 ? 0 : vcc->qos.aal); if (!test_bit(ATM_VF_HASQOS, &vcc->flags)) return -EBADFD; if (vcc->qos.txtp.traffic_class == ATM_ANYCLASS || vcc->qos.rxtp.traffic_class == ATM_ANYCLASS) return -EINVAL; if (likely(itf != ATM_ITF_ANY)) { dev = try_then_request_module(atm_dev_lookup(itf), "atm-device-%d", itf); } else { dev = NULL; mutex_lock(&atm_dev_mutex); if (!list_empty(&atm_devs)) { dev = list_entry(atm_devs.next, struct atm_dev, dev_list); atm_dev_hold(dev); } mutex_unlock(&atm_dev_mutex); } if (!dev) return -ENODEV; error = __vcc_connect(vcc, dev, vpi, vci); if (error) { atm_dev_put(dev); return error; } if (vpi == ATM_VPI_UNSPEC || vci == ATM_VCI_UNSPEC) set_bit(ATM_VF_PARTIAL, &vcc->flags); if (test_bit(ATM_VF_READY, &ATM_SD(sock)->flags)) sock->state = SS_CONNECTED; return 0; }

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Chas Williams29870.12%428.57%
Linus Torvalds (pre-git)8319.53%428.57%
Mitchell Blank Jr.368.47%214.29%
Ingo Molnar20.47%17.14%
Joe Perches20.47%17.14%
Stanislaw W. Gruszka20.47%17.14%
Stephen Hemminger20.47%17.14%
Total425100.00%14100.00%


int vcc_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, int flags) { struct sock *sk = sock->sk; struct atm_vcc *vcc; struct sk_buff *skb; int copied, error