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authorMike Maloney <maloney@google.com>2017-04-21 10:56:11 -0400
committerDavid S. Miller <davem@davemloft.net>2017-04-24 12:46:00 -0400
commit4a69a864209e9ab436d4a58e8028ac96cc873d15 (patch)
treebf8f3666194ccbfc21b3173db46a18e36b390b4e /net/packet
parent2e7a721714b9cdca539da78a0eb1f59dbe4020ac (diff)
downloadlinux-4a69a864209e9ab436d4a58e8028ac96cc873d15.tar.bz2
packet: add PACKET_FANOUT_FLAG_UNIQUEID to assign new fanout group id.
Fanout uses a per net global namespace. A process that intends to create a new fanout group can accidentally join an existing group. It is not possible to detect this. Add socket option PACKET_FANOUT_FLAG_UNIQUEID. When specified the supplied fanout group id must be set to 0, and the kernel chooses an id that is not already in use. This is an ephemeral flag so that other sockets can be added to this group using setsockopt, but NOT specifying this flag. The current getsockopt(..., PACKET_FANOUT, ...) can be used to retrieve the new group id. We assume that there are not a lot of fanout groups and that this is not a high frequency call. The method assigns ids starting at zero and increases until it finds an unused id. It keeps track of the last assigned id, and uses it as a starting point to find new ids. Signed-off-by: Mike Maloney <maloney@google.com> Acked-by: Willem de Bruijn <willemb@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/packet')
-rw-r--r--net/packet/af_packet.c44
1 files changed, 44 insertions, 0 deletions
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index 8489beff5c25..94052f42058b 100644
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -1496,6 +1496,7 @@ static int packet_rcv_fanout(struct sk_buff *skb, struct net_device *dev,
DEFINE_MUTEX(fanout_mutex);
EXPORT_SYMBOL_GPL(fanout_mutex);
static LIST_HEAD(fanout_list);
+static u16 fanout_next_id;
static void __fanout_link(struct sock *sk, struct packet_sock *po)
{
@@ -1629,6 +1630,36 @@ static void fanout_release_data(struct packet_fanout *f)
};
}
+static bool __fanout_id_is_free(struct sock *sk, u16 candidate_id)
+{
+ struct packet_fanout *f;
+
+ list_for_each_entry(f, &fanout_list, list) {
+ if (f->id == candidate_id &&
+ read_pnet(&f->net) == sock_net(sk)) {
+ return false;
+ }
+ }
+ return true;
+}
+
+static bool fanout_find_new_id(struct sock *sk, u16 *new_id)
+{
+ u16 id = fanout_next_id;
+
+ do {
+ if (__fanout_id_is_free(sk, id)) {
+ *new_id = id;
+ fanout_next_id = id + 1;
+ return true;
+ }
+
+ id++;
+ } while (id != fanout_next_id);
+
+ return false;
+}
+
static int fanout_add(struct sock *sk, u16 id, u16 type_flags)
{
struct packet_rollover *rollover = NULL;
@@ -1676,6 +1707,19 @@ static int fanout_add(struct sock *sk, u16 id, u16 type_flags)
po->rollover = rollover;
}
+ if (type_flags & PACKET_FANOUT_FLAG_UNIQUEID) {
+ if (id != 0) {
+ err = -EINVAL;
+ goto out;
+ }
+ if (!fanout_find_new_id(sk, &id)) {
+ err = -ENOMEM;
+ goto out;
+ }
+ /* ephemeral flag for the first socket in the group: drop it */
+ flags &= ~(PACKET_FANOUT_FLAG_UNIQUEID >> 8);
+ }
+
match = NULL;
list_for_each_entry(f, &fanout_list, list) {
if (f->id == id &&