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path: root/net/packet/af_packet.c
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Diffstat (limited to 'net/packet/af_packet.c')
-rw-r--r--net/packet/af_packet.c113
1 files changed, 67 insertions, 46 deletions
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index 616cb9c18f88..674390b1f084 100644
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -329,11 +329,11 @@ static void packet_pick_tx_queue(struct net_device *dev, struct sk_buff *skb)
skb_set_queue_mapping(skb, queue_index);
}
-/* register_prot_hook must be invoked with the po->bind_lock held,
+/* __register_prot_hook must be invoked through register_prot_hook
* or from a context in which asynchronous accesses to the packet
* socket is not possible (packet_create()).
*/
-static void register_prot_hook(struct sock *sk)
+static void __register_prot_hook(struct sock *sk)
{
struct packet_sock *po = pkt_sk(sk);
@@ -348,8 +348,13 @@ static void register_prot_hook(struct sock *sk)
}
}
-/* {,__}unregister_prot_hook() must be invoked with the po->bind_lock
- * held. If the sync parameter is true, we will temporarily drop
+static void register_prot_hook(struct sock *sk)
+{
+ lockdep_assert_held_once(&pkt_sk(sk)->bind_lock);
+ __register_prot_hook(sk);
+}
+
+/* If the sync parameter is true, we will temporarily drop
* the po->bind_lock and do a synchronize_net to make sure no
* asynchronous packet processing paths still refer to the elements
* of po->prot_hook. If the sync parameter is false, it is the
@@ -359,6 +364,8 @@ static void __unregister_prot_hook(struct sock *sk, bool sync)
{
struct packet_sock *po = pkt_sk(sk);
+ lockdep_assert_held_once(&po->bind_lock);
+
po->running = 0;
if (po->fanout)
@@ -2896,13 +2903,15 @@ static int packet_snd(struct socket *sock, struct msghdr *msg, size_t len)
if (skb == NULL)
goto out_unlock;
- skb_set_network_header(skb, reserve);
+ skb_reset_network_header(skb);
err = -EINVAL;
if (sock->type == SOCK_DGRAM) {
offset = dev_hard_header(skb, dev, ntohs(proto), addr, NULL, len);
if (unlikely(offset < 0))
goto out_free;
+ } else if (reserve) {
+ skb_reserve(skb, -reserve);
}
/* Returns -EFAULT on error */
@@ -3008,6 +3017,7 @@ static int packet_release(struct socket *sock)
packet_flush_mclist(sk);
+ lock_sock(sk);
if (po->rx_ring.pg_vec) {
memset(&req_u, 0, sizeof(req_u));
packet_set_ring(sk, &req_u, 1, 0);
@@ -3017,6 +3027,7 @@ static int packet_release(struct socket *sock)
memset(&req_u, 0, sizeof(req_u));
packet_set_ring(sk, &req_u, 1, 1);
}
+ release_sock(sk);
f = fanout_release(sk);
@@ -3250,7 +3261,7 @@ static int packet_create(struct net *net, struct socket *sock, int protocol,
if (proto) {
po->prot_hook.type = proto;
- register_prot_hook(sk);
+ __register_prot_hook(sk);
}
mutex_lock(&net->packet.sklist_lock);
@@ -3643,6 +3654,7 @@ packet_setsockopt(struct socket *sock, int level, int optname, char __user *optv
union tpacket_req_u req_u;
int len;
+ lock_sock(sk);
switch (po->tp_version) {
case TPACKET_V1:
case TPACKET_V2:
@@ -3653,12 +3665,17 @@ packet_setsockopt(struct socket *sock, int level, int optname, char __user *optv
len = sizeof(req_u.req3);
break;
}
- if (optlen < len)
- return -EINVAL;
- if (copy_from_user(&req_u.req, optval, len))
- return -EFAULT;
- return packet_set_ring(sk, &req_u, 0,
- optname == PACKET_TX_RING);
+ if (optlen < len) {
+ ret = -EINVAL;
+ } else {
+ if (copy_from_user(&req_u.req, optval, len))
+ ret = -EFAULT;
+ else
+ ret = packet_set_ring(sk, &req_u, 0,
+ optname == PACKET_TX_RING);
+ }
+ release_sock(sk);
+ return ret;
}
case PACKET_COPY_THRESH:
{
@@ -3724,12 +3741,18 @@ packet_setsockopt(struct socket *sock, int level, int optname, char __user *optv
if (optlen != sizeof(val))
return -EINVAL;
- if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
- return -EBUSY;
if (copy_from_user(&val, optval, sizeof(val)))
return -EFAULT;
- po->tp_loss = !!val;
- return 0;
+
+ lock_sock(sk);
+ if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) {
+ ret = -EBUSY;
+ } else {
+ po->tp_loss = !!val;
+ ret = 0;
+ }
+ release_sock(sk);
+ return ret;
}
case PACKET_AUXDATA:
{
@@ -3740,7 +3763,9 @@ packet_setsockopt(struct socket *sock, int level, int optname, char __user *optv
if (copy_from_user(&val, optval, sizeof(val)))
return -EFAULT;
+ lock_sock(sk);
po->auxdata = !!val;
+ release_sock(sk);
return 0;
}
case PACKET_ORIGDEV:
@@ -3752,7 +3777,9 @@ packet_setsockopt(struct socket *sock, int level, int optname, char __user *optv
if (copy_from_user(&val, optval, sizeof(val)))
return -EFAULT;
+ lock_sock(sk);
po->origdev = !!val;
+ release_sock(sk);
return 0;
}
case PACKET_VNET_HDR:
@@ -3761,15 +3788,20 @@ packet_setsockopt(struct socket *sock, int level, int optname, char __user *optv
if (sock->type != SOCK_RAW)
return -EINVAL;
- if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
- return -EBUSY;
if (optlen < sizeof(val))
return -EINVAL;
if (copy_from_user(&val, optval, sizeof(val)))
return -EFAULT;
- po->has_vnet_hdr = !!val;
- return 0;
+ lock_sock(sk);
+ if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) {
+ ret = -EBUSY;
+ } else {
+ po->has_vnet_hdr = !!val;
+ ret = 0;
+ }
+ release_sock(sk);
+ return ret;
}
case PACKET_TIMESTAMP:
{
@@ -3807,11 +3839,17 @@ packet_setsockopt(struct socket *sock, int level, int optname, char __user *optv
if (optlen != sizeof(val))
return -EINVAL;
- if (po->rx_ring.pg_vec || po->tx_ring.pg_vec)
- return -EBUSY;
if (copy_from_user(&val, optval, sizeof(val)))
return -EFAULT;
- po->tp_tx_has_off = !!val;
+
+ lock_sock(sk);
+ if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) {
+ ret = -EBUSY;
+ } else {
+ po->tp_tx_has_off = !!val;
+ ret = 0;
+ }
+ release_sock(sk);
return 0;
}
case PACKET_QDISC_BYPASS:
@@ -4072,12 +4110,11 @@ static int packet_ioctl(struct socket *sock, unsigned int cmd,
return 0;
}
-static __poll_t packet_poll(struct file *file, struct socket *sock,
- poll_table *wait)
+static __poll_t packet_poll_mask(struct socket *sock, __poll_t events)
{
struct sock *sk = sock->sk;
struct packet_sock *po = pkt_sk(sk);
- __poll_t mask = datagram_poll(file, sock, wait);
+ __poll_t mask = datagram_poll_mask(sock, events);
spin_lock_bh(&sk->sk_receive_queue.lock);
if (po->rx_ring.pg_vec) {
@@ -4208,8 +4245,6 @@ static int packet_set_ring(struct sock *sk, union tpacket_req_u *req_u,
/* Added to avoid minimal code churn */
struct tpacket_req *req = &req_u->req;
- lock_sock(sk);
-
rb = tx_ring ? &po->tx_ring : &po->rx_ring;
rb_queue = tx_ring ? &sk->sk_write_queue : &sk->sk_receive_queue;
@@ -4347,7 +4382,6 @@ static int packet_set_ring(struct sock *sk, union tpacket_req_u *req_u,
if (pg_vec)
free_pg_vec(pg_vec, order, req->tp_block_nr);
out:
- release_sock(sk);
return err;
}
@@ -4422,7 +4456,7 @@ static const struct proto_ops packet_ops_spkt = {
.socketpair = sock_no_socketpair,
.accept = sock_no_accept,
.getname = packet_getname_spkt,
- .poll = datagram_poll,
+ .poll_mask = datagram_poll_mask,
.ioctl = packet_ioctl,
.listen = sock_no_listen,
.shutdown = sock_no_shutdown,
@@ -4443,7 +4477,7 @@ static const struct proto_ops packet_ops = {
.socketpair = sock_no_socketpair,
.accept = sock_no_accept,
.getname = packet_getname,
- .poll = packet_poll,
+ .poll_mask = packet_poll_mask,
.ioctl = packet_ioctl,
.listen = sock_no_listen,
.shutdown = sock_no_shutdown,
@@ -4521,20 +4555,6 @@ static const struct seq_operations packet_seq_ops = {
.stop = packet_seq_stop,
.show = packet_seq_show,
};
-
-static int packet_seq_open(struct inode *inode, struct file *file)
-{
- return seq_open_net(inode, file, &packet_seq_ops,
- sizeof(struct seq_net_private));
-}
-
-static const struct file_operations packet_seq_fops = {
- .open = packet_seq_open,
- .read = seq_read,
- .llseek = seq_lseek,
- .release = seq_release_net,
-};
-
#endif
static int __net_init packet_net_init(struct net *net)
@@ -4542,7 +4562,8 @@ static int __net_init packet_net_init(struct net *net)
mutex_init(&net->packet.sklist_lock);
INIT_HLIST_HEAD(&net->packet.sklist);
- if (!proc_create("packet", 0, net->proc_net, &packet_seq_fops))
+ if (!proc_create_net("packet", 0, net->proc_net, &packet_seq_ops,
+ sizeof(struct seq_net_private)))
return -ENOMEM;
return 0;
generated by cgit v1.2.3 (git 2.39.0) at 2024-11-25 19:18:19 +0300