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linux/net/atm/common.c
Neil Horman 3b885787ea net: Generalize socket rx gap / receive queue overflow cmsg 
Create a new socket level option to report number of queue overflows

Recently I augmented the AF_PACKET protocol to report the number of frames lost
on the socket receive queue between any two enqueued frames.  This value was
exported via a SOL_PACKET level cmsg.  AFter I completed that work it was
requested that this feature be generalized so that any datagram oriented socket
could make use of this option.  As such I've created this patch, It creates a
new SOL_SOCKET level option called SO_RXQ_OVFL, which when enabled exports a
SOL_SOCKET level cmsg that reports the nubmer of times the sk_receive_queue
overflowed between any two given frames.  It also augments the AF_PACKET
protocol to take advantage of this new feature (as it previously did not touch
sk->sk_drops, which this patch uses to record the overflow count).  Tested
successfully by me.

Notes:

1) Unlike my previous patch, this patch simply records the sk_drops value, which
is not a number of drops between packets, but rather a total number of drops.
Deltas must be computed in user space.

2) While this patch currently works with datagram oriented protocols, it will
also be accepted by non-datagram oriented protocols. I'm not sure if thats
agreeable to everyone, but my argument in favor of doing so is that, for those
protocols which aren't applicable to this option, sk_drops will always be zero,
and reporting no drops on a receive queue that isn't used for those
non-participating protocols seems reasonable to me.  This also saves us having
to code in a per-protocol opt in mechanism.

3) This applies cleanly to net-next assuming that commit
977750076d (my af packet cmsg patch) is reverted

Signed-off-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-10-12 13:26:31 -07:00

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/* net/atm/common.c - ATM sockets (common part for PVC and SVC) */
/* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
#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.h>
#include <linux/time.h> /* struct timeval */
#include <linux/skbuff.h>
#include <linux/bitops.h>
#include <linux/init.h>
#include <net/sock.h> /* struct sock */
#include <asm/uaccess.h>
#include <asm/atomic.h>
#include <asm/poll.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];
DEFINE_RWLOCK(vcc_sklist_lock);
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);
}
void vcc_insert_socket(struct sock *sk)
{
write_lock_irq(&vcc_sklist_lock);
__vcc_insert_socket(sk);
write_unlock_irq(&vcc_sklist_lock);
}
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);
}
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("AlTx %d += %d\n", sk_wmem_alloc_get(sk), skb->truesize);
atomic_add(skb->truesize, &sk->sk_wmem_alloc);
return skb;
}
EXPORT_SYMBOL(vcc_hash);
EXPORT_SYMBOL(vcc_sklist_lock);
EXPORT_SYMBOL(vcc_insert_socket);
static void vcc_sock_destruct(struct sock *sk)
{
if (atomic_read(&sk->sk_rmem_alloc))
printk(KERN_DEBUG "vcc_sock_destruct: rmem leakage (%d bytes) detected.\n", atomic_read(&sk->sk_rmem_alloc));
if (atomic_read(&sk->sk_wmem_alloc))
printk(KERN_DEBUG "vcc_sock_destruct: wmem leakage (%d bytes) detected.\n", atomic_read(&sk->sk_wmem_alloc));
}
static void vcc_def_wakeup(struct sock *sk)
{
read_lock(&sk->sk_callback_lock);
if (sk_has_sleeper(sk))
wake_up(sk->sk_sleep);
read_unlock(&sk->sk_callback_lock);
}
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;
}
static void vcc_write_space(struct sock *sk)
{
read_lock(&sk->sk_callback_lock);
if (vcc_writable(sk)) {
if (sk_has_sleeper(sk))
wake_up_interruptible(sk->sk_sleep);
sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
}
read_unlock(&sk->sk_callback_lock);
}
static struct proto vcc_proto = {
.name = "VCC",
.owner = THIS_MODULE,
.obj_size = sizeof(struct atm_vcc),
};
int vcc_create(struct net *net, struct socket *sock, int protocol, int family)
{
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);
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->push_oam = 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;
}
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 */
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);
}
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;
}
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);
}
EXPORT_SYMBOL(vcc_release_async);
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 *node, *tmp;
struct sock *s;
struct atm_vcc *vcc;
sk_for_each_safe(s, node, 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);
}
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:
printk(KERN_WARNING "ATM: 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;
}
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 hlist_node *node;
struct sock *s;
struct atm_vcc *walk;
sk_for_each(s, node, 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;
}
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;
}
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) {
if ((error = dev->ops->open(vcc)))
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;
}
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("vcc_connect (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("vcc_connect (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;
}
int vcc_recvmsg(struct kiocb *iocb, 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 = -EINVAL;
if (sock->state != SS_CONNECTED)
return -ENOTCONN;
if (flags & ~MSG_DONTWAIT) /* only handle MSG_DONTWAIT */
return -EOPNOTSUPP;
vcc = ATM_SD(sock);
if (test_bit(ATM_VF_RELEASED,&vcc->flags) ||
test_bit(ATM_VF_CLOSE,&vcc->flags) ||
!test_bit(ATM_VF_READY, &vcc->flags))
return 0;
skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &error);
if (!skb)
return error;
copied = skb->len;
if (copied > size) {
copied = size;
msg->msg_flags |= MSG_TRUNC;
}
error = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
if (error)
return error;
sock_recv_ts_and_drops(msg, sk, skb);
pr_debug("RcvM %d -= %d\n", atomic_read(&sk->sk_rmem_alloc), skb->truesize);
atm_return(vcc, skb->truesize);
skb_free_datagram(sk, skb);
return copied;
}
int vcc_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m,
size_t total_len)
{
struct sock *sk = sock->sk;
DEFINE_WAIT(wait);
struct atm_vcc *vcc;
struct sk_buff *skb;
int eff,error;
const void __user *buff;
int size;
lock_sock(sk);
if (sock->state != SS_CONNECTED) {
error = -ENOTCONN;
goto out;
}
if (m->msg_name) {
error = -EISCONN;
goto out;
}
if (m->msg_iovlen != 1) {
error = -ENOSYS; /* fix this later @@@ */
goto out;
}
buff = m->msg_iov->iov_base;
size = m->msg_iov->iov_len;
vcc = ATM_SD(sock);
if (test_bit(ATM_VF_RELEASED, &vcc->flags) ||
test_bit(ATM_VF_CLOSE, &vcc->flags) ||
!test_bit(ATM_VF_READY, &vcc->flags)) {
error = -EPIPE;
send_sig(SIGPIPE, current, 0);
goto out;
}
if (!size) {
error = 0;
goto out;
}
if (size < 0 || size > vcc->qos.txtp.max_sdu) {
error = -EMSGSIZE;
goto out;
}
eff = (size+3) & ~3; /* align to word boundary */
prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
error = 0;
while (!(skb = alloc_tx(vcc,eff))) {
if (m->msg_flags & MSG_DONTWAIT) {
error = -EAGAIN;
break;
}
schedule();
if (signal_pending(current)) {
error = -ERESTARTSYS;
break;
}
if (test_bit(ATM_VF_RELEASED,&vcc->flags) ||
test_bit(ATM_VF_CLOSE,&vcc->flags) ||
!test_bit(ATM_VF_READY,&vcc->flags)) {
error = -EPIPE;
send_sig(SIGPIPE, current, 0);
break;
}
prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
}
finish_wait(sk->sk_sleep, &wait);
if (error)
goto out;
skb->dev = NULL; /* for paths shared with net_device interfaces */
ATM_SKB(skb)->atm_options = vcc->atm_options;
if (copy_from_user(skb_put(skb,size),buff,size)) {
kfree_skb(skb);
error = -EFAULT;
goto out;
}
if (eff != size) memset(skb->data+size,0,eff-size);
error = vcc->dev->ops->send(vcc,skb);
error = error ? error : size;
out:
release_sock(sk);
return error;
}
unsigned int vcc_poll(struct file *file, struct socket *sock, poll_table *wait)
{
struct sock *sk = sock->sk;
struct atm_vcc *vcc;
unsigned int mask;
sock_poll_wait(file, sk->sk_sleep, wait);
mask = 0;
vcc = ATM_SD(sock);
/* exceptional events */
if (sk->sk_err)
mask = POLLERR;
if (test_bit(ATM_VF_RELEASED, &vcc->flags) ||
test_bit(ATM_VF_CLOSE, &vcc->flags))
mask |= POLLHUP;
/* readable? */
if (!skb_queue_empty(&sk->sk_receive_queue))
mask |= POLLIN | POLLRDNORM;
/* writable? */
if (sock->state == SS_CONNECTING &&
test_bit(ATM_VF_WAITING, &vcc->flags))
return mask;
if (vcc->qos.txtp.traffic_class != ATM_NONE &&
vcc_writable(sk))
mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
return mask;
}
static int atm_change_qos(struct atm_vcc *vcc,struct atm_qos *qos)
{
int error;
/*
* Don't let the QoS change the already connected AAL type nor the
* traffic class.
*/
if (qos->aal != vcc->qos.aal ||
qos->rxtp.traffic_class != vcc->qos.rxtp.traffic_class ||
qos->txtp.traffic_class != vcc->qos.txtp.traffic_class)
return -EINVAL;
error = adjust_tp(&qos->txtp,qos->aal);
if (!error) error = adjust_tp(&qos->rxtp,qos->aal);
if (error) return error;
if (!vcc->dev->ops->change_qos) return -EOPNOTSUPP;
if (sk_atm(vcc)->sk_family == AF_ATMPVC)
return vcc->dev->ops->change_qos(vcc,qos,ATM_MF_SET);
return svc_change_qos(vcc,qos);
}
static int check_tp(const struct atm_trafprm *tp)
{
/* @@@ Should be merged with adjust_tp */
if (!tp->traffic_class || tp->traffic_class == ATM_ANYCLASS) return 0;
if (tp->traffic_class != ATM_UBR && !tp->min_pcr && !tp->pcr &&
!tp->max_pcr) return -EINVAL;
if (tp->min_pcr == ATM_MAX_PCR) return -EINVAL;
if (tp->min_pcr && tp->max_pcr && tp->max_pcr != ATM_MAX_PCR &&
tp->min_pcr > tp->max_pcr) return -EINVAL;
/*
* We allow pcr to be outside [min_pcr,max_pcr], because later
* adjustment may still push it in the valid range.
*/
return 0;
}
static int check_qos(const struct atm_qos *qos)
{
int error;
if (!qos->txtp.traffic_class && !qos->rxtp.traffic_class)
return -EINVAL;
if (qos->txtp.traffic_class != qos->rxtp.traffic_class &&
qos->txtp.traffic_class && qos->rxtp.traffic_class &&
qos->txtp.traffic_class != ATM_ANYCLASS &&
qos->rxtp.traffic_class != ATM_ANYCLASS) return -EINVAL;
error = check_tp(&qos->txtp);
if (error) return error;
return check_tp(&qos->rxtp);
}
int vcc_setsockopt(struct socket *sock, int level, int optname,
char __user *optval, unsigned int optlen)
{
struct atm_vcc *vcc;
unsigned long value;
int error;
if (__SO_LEVEL_MATCH(optname, level) && optlen != __SO_SIZE(optname))
return -EINVAL;
vcc = ATM_SD(sock);
switch (optname) {
case SO_ATMQOS:
{
struct atm_qos qos;
if (copy_from_user(&qos,optval,sizeof(qos)))
return -EFAULT;
error = check_qos(&qos);
if (error) return error;
if (sock->state == SS_CONNECTED)
return atm_change_qos(vcc,&qos);
if (sock->state != SS_UNCONNECTED)
return -EBADFD;
vcc->qos = qos;
set_bit(ATM_VF_HASQOS,&vcc->flags);
return 0;
}
case SO_SETCLP:
if (get_user(value,(unsigned long __user *)optval))
return -EFAULT;
if (value) vcc->atm_options |= ATM_ATMOPT_CLP;
else vcc->atm_options &= ~ATM_ATMOPT_CLP;
return 0;
default:
if (level == SOL_SOCKET) return -EINVAL;
break;
}
if (!vcc->dev || !vcc->dev->ops->setsockopt) return -EINVAL;
return vcc->dev->ops->setsockopt(vcc,level,optname,optval,optlen);
}
int vcc_getsockopt(struct socket *sock, int level, int optname,
char __user *optval, int __user *optlen)
{
struct atm_vcc *vcc;
int len;
if (get_user(len, optlen))
return -EFAULT;
if (__SO_LEVEL_MATCH(optname, level) && len != __SO_SIZE(optname))
return -EINVAL;
vcc = ATM_SD(sock);
switch (optname) {
case SO_ATMQOS:
if (!test_bit(ATM_VF_HASQOS,&vcc->flags))
return -EINVAL;
return copy_to_user(optval,&vcc->qos,sizeof(vcc->qos)) ?
-EFAULT : 0;
case SO_SETCLP:
return put_user(vcc->atm_options & ATM_ATMOPT_CLP ? 1 :
0,(unsigned long __user *)optval) ? -EFAULT : 0;
case SO_ATMPVC:
{
struct sockaddr_atmpvc pvc;
if (!vcc->dev ||
!test_bit(ATM_VF_ADDR,&vcc->flags))
return -ENOTCONN;
pvc.sap_family = AF_ATMPVC;
pvc.sap_addr.itf = vcc->dev->number;
pvc.sap_addr.vpi = vcc->vpi;
pvc.sap_addr.vci = vcc->vci;
return copy_to_user(optval,&pvc,sizeof(pvc)) ?
-EFAULT : 0;
}
default:
if (level == SOL_SOCKET) return -EINVAL;
break;
}
if (!vcc->dev || !vcc->dev->ops->getsockopt) return -EINVAL;
return vcc->dev->ops->getsockopt(vcc, level, optname, optval, len);
}
static int __init atm_init(void)
{
int error;
if ((error = proto_register(&vcc_proto, 0)) < 0)
goto out;
if ((error = atmpvc_init()) < 0) {
printk(KERN_ERR "atmpvc_init() failed with %d\n", error);
goto out_unregister_vcc_proto;
}
if ((error = atmsvc_init()) < 0) {
printk(KERN_ERR "atmsvc_init() failed with %d\n", error);
goto out_atmpvc_exit;
}
if ((error = atm_proc_init()) < 0) {
printk(KERN_ERR "atm_proc_init() failed with %d\n",error);
goto out_atmsvc_exit;
}
if ((error = atm_sysfs_init()) < 0) {
printk(KERN_ERR "atm_sysfs_init() failed with %d\n",error);
goto out_atmproc_exit;
}
out:
return error;
out_atmproc_exit:
atm_proc_exit();
out_atmsvc_exit:
atmsvc_exit();
out_atmpvc_exit:
atmsvc_exit();
out_unregister_vcc_proto:
proto_unregister(&vcc_proto);
goto out;
}
static void __exit atm_exit(void)
{
atm_proc_exit();
atm_sysfs_exit();
atmsvc_exit();
atmpvc_exit();
proto_unregister(&vcc_proto);
}
subsys_initcall(atm_init);
module_exit(atm_exit);
MODULE_LICENSE("GPL");
MODULE_ALIAS_NETPROTO(PF_ATMPVC);
MODULE_ALIAS_NETPROTO(PF_ATMSVC);
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