char *pkblk_start;
char *pkblk_end;
int kblk_size;
+ unsigned int max_frame_len;
unsigned int knum_blocks;
uint64_t knxt_seq_num;
char *prev;
p1->tov_in_jiffies = msecs_to_jiffies(p1->retire_blk_tov);
p1->blk_sizeof_priv = req_u->req3.tp_sizeof_priv;
+ p1->max_frame_len = p1->kblk_size - BLK_PLUS_PRIV(p1->blk_sizeof_priv);
prb_init_ft_ops(p1, req_u);
prb_setup_retire_blk_timer(po, tx_ring);
prb_open_block(p1, pbd);
f->arr[f->num_members] = sk;
smp_wmb();
f->num_members++;
+ if (f->num_members == 1)
+ dev_add_pack(&f->prot_hook);
spin_unlock(&f->lock);
}
BUG_ON(i >= f->num_members);
f->arr[i] = f->arr[f->num_members - 1];
f->num_members--;
+ if (f->num_members == 0)
+ __dev_remove_pack(&f->prot_hook);
spin_unlock(&f->lock);
}
mutex_lock(&fanout_mutex);
- err = -EINVAL;
- if (!po->running)
- goto out;
-
err = -EALREADY;
if (po->fanout)
goto out;
match->prot_hook.func = packet_rcv_fanout;
match->prot_hook.af_packet_priv = match;
match->prot_hook.id_match = match_fanout_group;
- dev_add_pack(&match->prot_hook);
list_add(&match->list, &fanout_list);
}
err = -EINVAL;
- if (match->type == type &&
+
+ spin_lock(&po->bind_lock);
+ if (po->running &&
+ match->type == type &&
match->prot_hook.type == po->prot_hook.type &&
match->prot_hook.dev == po->prot_hook.dev) {
err = -ENOSPC;
err = 0;
}
}
+ spin_unlock(&po->bind_lock);
+
+ if (err && !atomic_read(&match->sk_ref)) {
+ list_del(&match->list);
+ kfree(match);
+ }
+
out:
mutex_unlock(&fanout_mutex);
return err;
}
-static void fanout_release(struct sock *sk)
+/* If pkt_sk(sk)->fanout->sk_ref is zero, this function removes
+ * pkt_sk(sk)->fanout from fanout_list and returns pkt_sk(sk)->fanout.
+ * It is the responsibility of the caller to call fanout_release_data() and
+ * free the returned packet_fanout (after synchronize_net())
+ */
+static struct packet_fanout *fanout_release(struct sock *sk)
{
struct packet_sock *po = pkt_sk(sk);
struct packet_fanout *f;
if (f) {
po->fanout = NULL;
- if (atomic_dec_and_test(&f->sk_ref)) {
+ if (atomic_dec_and_test(&f->sk_ref))
list_del(&f->list);
- dev_remove_pack(&f->prot_hook);
- kfree(f);
- }
+ else
+ f = NULL;
}
mutex_unlock(&fanout_mutex);
+
+ return f;
}
static const struct proto_ops packet_ops;
if ((int)snaplen < 0)
snaplen = 0;
}
+ } else if (unlikely(macoff + snaplen >
+ GET_PBDQC_FROM_RB(&po->rx_ring)->max_frame_len)) {
+ u32 nval;
+
+ nval = GET_PBDQC_FROM_RB(&po->rx_ring)->max_frame_len - macoff;
+ pr_err_once("tpacket_rcv: packet too big, clamped from %u to %u. macoff=%u\n",
+ snaplen, nval, macoff);
+ snaplen = nval;
+ if (unlikely((int)snaplen < 0)) {
+ snaplen = 0;
+ macoff = GET_PBDQC_FROM_RB(&po->rx_ring)->max_frame_len;
+ }
}
spin_lock(&sk->sk_receive_queue.lock);
h.raw = packet_current_rx_frame(po, skb,
int offset = 0;
int vnet_hdr_len;
struct packet_sock *po = pkt_sk(sk);
+ bool has_vnet_hdr = false;
unsigned short gso_type = 0;
/*
reserve = dev->hard_header_len;
if (po->has_vnet_hdr) {
vnet_hdr_len = sizeof(vnet_hdr);
+ has_vnet_hdr = true;
err = -EINVAL;
if (len < vnet_hdr_len)
skb->priority = sk->sk_priority;
skb->mark = sk->sk_mark;
- if (po->has_vnet_hdr) {
+ if (has_vnet_hdr) {
if (vnet_hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
if (!skb_partial_csum_set(skb, vnet_hdr.csum_start,
vnet_hdr.csum_offset)) {
{
struct sock *sk = sock->sk;
struct packet_sock *po;
+ struct packet_fanout *f;
struct net *net;
union tpacket_req_u req_u;
packet_set_ring(sk, &req_u, 1, 1);
}
- fanout_release(sk);
+ f = fanout_release(sk);
synchronize_net();
+
+ kfree(f);
+
/*
* Now the socket is dead. No more input will appear.
*/
* Attach a packet hook.
*/
-static int packet_do_bind(struct sock *sk, struct net_device *dev, __be16 protocol)
+static int packet_do_bind(struct sock *sk, const char *name, int ifindex,
+ __be16 protocol)
{
struct packet_sock *po = pkt_sk(sk);
+ struct net_device *dev_curr;
+ struct net_device *dev = NULL;
+ int ret = 0;
+ bool unlisted = false;
+
+ lock_sock(sk);
+
+ spin_lock(&po->bind_lock);
+ rcu_read_lock();
if (po->fanout) {
- if (dev)
- dev_put(dev);
+ ret = -EINVAL;
+ goto out_unlock;
+ }
- return -EINVAL;
+ if (name) {
+ dev = dev_get_by_name_rcu(sock_net(sk), name);
+ if (!dev) {
+ ret = -ENODEV;
+ goto out_unlock;
+ }
+ } else if (ifindex) {
+ dev = dev_get_by_index_rcu(sock_net(sk), ifindex);
+ if (!dev) {
+ ret = -ENODEV;
+ goto out_unlock;
+ }
}
- lock_sock(sk);
+ if (dev)
+ dev_hold(dev);
- spin_lock(&po->bind_lock);
- unregister_prot_hook(sk, true);
+ dev_curr = po->prot_hook.dev;
+
+ if (po->running) {
+ rcu_read_unlock();
+ /* prevents packet_notifier() from calling
+ * register_prot_hook()
+ */
+ po->num = 0;
+ __unregister_prot_hook(sk, true);
+ rcu_read_lock();
+ dev_curr = po->prot_hook.dev;
+ if (dev)
+ unlisted = !dev_get_by_index_rcu(sock_net(sk),
+ dev->ifindex);
+ }
+ BUG_ON(po->running);
po->num = protocol;
po->prot_hook.type = protocol;
- if (po->prot_hook.dev)
- dev_put(po->prot_hook.dev);
- po->prot_hook.dev = dev;
- po->ifindex = dev ? dev->ifindex : 0;
+ if (unlikely(unlisted)) {
+ dev_put(dev);
+ po->prot_hook.dev = NULL;
+ po->ifindex = -1;
+ } else {
+ po->prot_hook.dev = dev;
+ po->ifindex = dev ? dev->ifindex : 0;
+ }
+
+ if (dev_curr)
+ dev_put(dev_curr);
if (protocol == 0)
goto out_unlock;
- if (!dev || (dev->flags & IFF_UP)) {
+ if (!unlisted && (!dev || (dev->flags & IFF_UP))) {
register_prot_hook(sk);
} else {
sk->sk_err = ENETDOWN;
}
out_unlock:
+ rcu_read_unlock();
spin_unlock(&po->bind_lock);
release_sock(sk);
- return 0;
+ return ret;
}
/*
{
struct sock *sk = sock->sk;
char name[15];
- struct net_device *dev;
- int err = -ENODEV;
/*
* Check legality
return -EINVAL;
strlcpy(name, uaddr->sa_data, sizeof(name));
- dev = dev_get_by_name(sock_net(sk), name);
- if (dev)
- err = packet_do_bind(sk, dev, pkt_sk(sk)->num);
- return err;
+ return packet_do_bind(sk, name, 0, pkt_sk(sk)->num);
}
static int packet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
{
struct sockaddr_ll *sll = (struct sockaddr_ll *)uaddr;
struct sock *sk = sock->sk;
- struct net_device *dev = NULL;
- int err;
-
/*
* Check legality
if (sll->sll_family != AF_PACKET)
return -EINVAL;
- if (sll->sll_ifindex) {
- err = -ENODEV;
- dev = dev_get_by_index(sock_net(sk), sll->sll_ifindex);
- if (dev == NULL)
- goto out;
- }
- err = packet_do_bind(sk, dev, sll->sll_protocol ? : pkt_sk(sk)->num);
-
-out:
- return err;
+ return packet_do_bind(sk, NULL, sll->sll_ifindex,
+ sll->sll_protocol ? : pkt_sk(sk)->num);
}
static struct proto packet_proto = {
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_reserve = val;
- return 0;
+ if (val > INT_MAX)
+ return -EINVAL;
+ lock_sock(sk);
+ if (po->rx_ring.pg_vec || po->tx_ring.pg_vec) {
+ ret = -EBUSY;
+ } else {
+ po->tp_reserve = val;
+ ret = 0;
+ }
+ release_sock(sk);
+ return ret;
}
case PACKET_LOSS:
{
goto out;
if (unlikely(req->tp_block_size & (PAGE_SIZE - 1)))
goto out;
+ if (po->tp_version >= TPACKET_V3 &&
+ req->tp_block_size <=
+ BLK_PLUS_PRIV((u64)req_u->req3.tp_sizeof_priv))
+ goto out;
if (unlikely(req->tp_frame_size < po->tp_hdrlen +
po->tp_reserve))
goto out;
rb->frames_per_block = req->tp_block_size/req->tp_frame_size;
if (unlikely(rb->frames_per_block <= 0))
goto out;
+ if (unlikely(req->tp_block_size > UINT_MAX / req->tp_block_nr))
+ goto out;
if (unlikely((rb->frames_per_block * req->tp_block_nr) !=
req->tp_frame_nr))
goto out;
git.openpandora.org / pandora-kernel.git / blobdiff