summaryrefslogtreecommitdiffstats
path: root/drivers/net/tun.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/net/tun.c')
-rw-r--r--drivers/net/tun.c167
1 files changed, 114 insertions, 53 deletions
diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index 15d67635bb1..0476549841a 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -64,6 +64,7 @@
#include <net/net_namespace.h>
#include <net/netns/generic.h>
#include <net/rtnetlink.h>
+#include <net/sock.h>
#include <asm/system.h>
#include <asm/uaccess.h>
@@ -95,6 +96,8 @@ struct tun_file {
wait_queue_head_t read_wait;
};
+struct tun_sock;
+
struct tun_struct {
struct tun_file *tfile;
unsigned int flags;
@@ -107,12 +110,24 @@ struct tun_struct {
struct fasync_struct *fasync;
struct tap_filter txflt;
+ struct sock *sk;
+ struct socket socket;
#ifdef TUN_DEBUG
int debug;
#endif
};
+struct tun_sock {
+ struct sock sk;
+ struct tun_struct *tun;
+};
+
+static inline struct tun_sock *tun_sk(struct sock *sk)
+{
+ return container_of(sk, struct tun_sock, sk);
+}
+
static int tun_attach(struct tun_struct *tun, struct file *file)
{
struct tun_file *tfile = file->private_data;
@@ -461,7 +476,8 @@ static unsigned int tun_chr_poll(struct file *file, poll_table * wait)
{
struct tun_file *tfile = file->private_data;
struct tun_struct *tun = __tun_get(tfile);
- unsigned int mask = POLLOUT | POLLWRNORM;
+ struct sock *sk = tun->sk;
+ unsigned int mask = 0;
if (!tun)
return POLLERR;
@@ -473,6 +489,11 @@ static unsigned int tun_chr_poll(struct file *file, poll_table * wait)
if (!skb_queue_empty(&tun->readq))
mask |= POLLIN | POLLRDNORM;
+ if (sock_writeable(sk) ||
+ (!test_and_set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags) &&
+ sock_writeable(sk)))
+ mask |= POLLOUT | POLLWRNORM;
+
if (tun->dev->reg_state != NETREG_REGISTERED)
mask = POLLERR;
@@ -482,66 +503,35 @@ static unsigned int tun_chr_poll(struct file *file, poll_table * wait)
/* prepad is the amount to reserve at front. len is length after that.
* linear is a hint as to how much to copy (usually headers). */
-static struct sk_buff *tun_alloc_skb(size_t prepad, size_t len, size_t linear,
- gfp_t gfp)
+static inline struct sk_buff *tun_alloc_skb(struct tun_struct *tun,
+ size_t prepad, size_t len,
+ size_t linear, int noblock)
{
+ struct sock *sk = tun->sk;
struct sk_buff *skb;
- unsigned int i;
-
- skb = alloc_skb(prepad + len, gfp|__GFP_NOWARN);
- if (skb) {
- skb_reserve(skb, prepad);
- skb_put(skb, len);
- return skb;
- }
+ int err;
/* Under a page? Don't bother with paged skb. */
if (prepad + len < PAGE_SIZE)
- return NULL;
+ linear = len;
- /* Start with a normal skb, and add pages. */
- skb = alloc_skb(prepad + linear, gfp);
+ skb = sock_alloc_send_pskb(sk, prepad + linear, len - linear, noblock,
+ &err);
if (!skb)
- return NULL;
+ return ERR_PTR(err);
skb_reserve(skb, prepad);
skb_put(skb, linear);
-
- len -= linear;
-
- for (i = 0; i < MAX_SKB_FRAGS; i++) {
- skb_frag_t *f = &skb_shinfo(skb)->frags[i];
-
- f->page = alloc_page(gfp|__GFP_ZERO);
- if (!f->page)
- break;
-
- f->page_offset = 0;
- f->size = PAGE_SIZE;
-
- skb->data_len += PAGE_SIZE;
- skb->len += PAGE_SIZE;
- skb->truesize += PAGE_SIZE;
- skb_shinfo(skb)->nr_frags++;
-
- if (len < PAGE_SIZE) {
- len = 0;
- break;
- }
- len -= PAGE_SIZE;
- }
-
- /* Too large, or alloc fail? */
- if (unlikely(len)) {
- kfree_skb(skb);
- skb = NULL;
- }
+ skb->data_len = len - linear;
+ skb->len += len - linear;
return skb;
}
/* Get packet from user space buffer */
-static __inline__ ssize_t tun_get_user(struct tun_struct *tun, struct iovec *iv, size_t count)
+static __inline__ ssize_t tun_get_user(struct tun_struct *tun,
+ struct iovec *iv, size_t count,
+ int noblock)
{
struct tun_pi pi = { 0, cpu_to_be16(ETH_P_IP) };
struct sk_buff *skb;
@@ -573,9 +563,11 @@ static __inline__ ssize_t tun_get_user(struct tun_struct *tun, struct iovec *iv,
return -EINVAL;
}
- if (!(skb = tun_alloc_skb(align, len, gso.hdr_len, GFP_KERNEL))) {
- tun->dev->stats.rx_dropped++;
- return -ENOMEM;
+ skb = tun_alloc_skb(tun, align, len, gso.hdr_len, noblock);
+ if (IS_ERR(skb)) {
+ if (PTR_ERR(skb) != -EAGAIN)
+ tun->dev->stats.rx_dropped++;
+ return PTR_ERR(skb);
}
if (skb_copy_datagram_from_iovec(skb, 0, iv, len)) {
@@ -661,7 +653,8 @@ static __inline__ ssize_t tun_get_user(struct tun_struct *tun, struct iovec *iv,
static ssize_t tun_chr_aio_write(struct kiocb *iocb, const struct iovec *iv,
unsigned long count, loff_t pos)
{
- struct tun_struct *tun = tun_get(iocb->ki_filp);
+ struct file *file = iocb->ki_filp;
+ struct tun_struct *tun = file->private_data;
ssize_t result;
if (!tun)
@@ -669,7 +662,8 @@ static ssize_t tun_chr_aio_write(struct kiocb *iocb, const struct iovec *iv,
DBG(KERN_INFO "%s: tun_chr_write %ld\n", tun->dev->name, count);
- result = tun_get_user(tun, (struct iovec *) iv, iov_length(iv, count));
+ result = tun_get_user(tun, (struct iovec *)iv, iov_length(iv, count),
+ file->f_flags & O_NONBLOCK);
tun_put(tun);
return result;
@@ -828,11 +822,40 @@ static struct rtnl_link_ops tun_link_ops __read_mostly = {
.validate = tun_validate,
};
+static void tun_sock_write_space(struct sock *sk)
+{
+ struct tun_struct *tun;
+
+ if (!sock_writeable(sk))
+ return;
+
+ if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
+ wake_up_interruptible_sync(sk->sk_sleep);
+
+ if (!test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags))
+ return;
+
+ tun = container_of(sk, struct tun_sock, sk)->tun;
+ kill_fasync(&tun->fasync, SIGIO, POLL_OUT);
+}
+
+static void tun_sock_destruct(struct sock *sk)
+{
+ dev_put(container_of(sk, struct tun_sock, sk)->tun->dev);
+}
+
+static struct proto tun_proto = {
+ .name = "tun",
+ .owner = THIS_MODULE,
+ .obj_size = sizeof(struct tun_sock),
+};
static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr)
{
+ struct sock *sk;
struct tun_struct *tun;
struct net_device *dev;
+ struct tun_file *tfile = file->private_data;
int err;
dev = __dev_get_by_name(net, ifr->ifr_name);
@@ -885,14 +908,31 @@ static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr)
tun->flags = flags;
tun->txflt.count = 0;
+ err = -ENOMEM;
+ sk = sk_alloc(net, AF_UNSPEC, GFP_KERNEL, &tun_proto);
+ if (!sk)
+ goto err_free_dev;
+
+ /* This ref count is for tun->sk. */
+ dev_hold(dev);
+ sock_init_data(&tun->socket, sk);
+ sk->sk_write_space = tun_sock_write_space;
+ sk->sk_destruct = tun_sock_destruct;
+ sk->sk_sndbuf = INT_MAX;
+ sk->sk_sleep = &tfile->read_wait;
+
+ tun->sk = sk;
+ container_of(sk, struct tun_sock, sk)->tun = tun;
+
tun_net_init(dev);
if (strchr(dev->name, '%')) {
err = dev_alloc_name(dev, dev->name);
if (err < 0)
- goto err_free_dev;
+ goto err_free_sk;
}
+ err = -EINVAL;
err = register_netdevice(tun->dev);
if (err < 0)
goto err_free_dev;
@@ -928,6 +968,8 @@ static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr)
strcpy(ifr->ifr_name, tun->dev->name);
return 0;
+ err_free_sk:
+ sock_put(sk);
err_free_dev:
free_netdev(dev);
failed:
@@ -1012,6 +1054,7 @@ static int tun_chr_ioctl(struct inode *inode, struct file *file,
struct tun_struct *tun;
void __user* argp = (void __user*)arg;
struct ifreq ifr;
+ int sndbuf;
int ret;
if (cmd == TUNSETIFF || _IOC_TYPE(cmd) == 0x89)
@@ -1151,6 +1194,22 @@ static int tun_chr_ioctl(struct inode *inode, struct file *file,
ret = dev_set_mac_address(tun->dev, &ifr.ifr_hwaddr);
rtnl_unlock();
break;
+
+ case TUNGETSNDBUF:
+ sndbuf = tun->sk->sk_sndbuf;
+ if (copy_to_user(argp, &sndbuf, sizeof(sndbuf)))
+ ret = -EFAULT;
+ break;
+
+ case TUNSETSNDBUF:
+ if (copy_from_user(&sndbuf, argp, sizeof(sndbuf))) {
+ ret = -EFAULT;
+ break;
+ }
+
+ tun->sk->sk_sndbuf = sndbuf;
+ break;
+
default:
ret = -EINVAL;
break;
@@ -1218,8 +1277,10 @@ static int tun_chr_close(struct inode *inode, struct file *file)
__tun_detach(tun);
/* If desireable, unregister the netdevice. */
- if (!(tun->flags & TUN_PERSIST))
+ if (!(tun->flags & TUN_PERSIST)) {
+ sock_put(tun->sk);
unregister_netdevice(tun->dev);
+ }
rtnl_unlock();
}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-12-20 01:09:23 +0000