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authorMike Maloney <maloney@google.com>2017-04-21 17:56:11 +0300
committerDavid S. Miller <davem@davemloft.net>2017-04-24 19:46:00 +0300
commit4a69a864209e9ab436d4a58e8028ac96cc873d15 (patch)
treebf8f3666194ccbfc21b3173db46a18e36b390b4e /include/uapi/linux/if_packet.h
parent2e7a721714b9cdca539da78a0eb1f59dbe4020ac (diff)
downloadlinux-4a69a864209e9ab436d4a58e8028ac96cc873d15.tar.xz
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 'include/uapi/linux/if_packet.h')
-rw-r--r--include/uapi/linux/if_packet.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/uapi/linux/if_packet.h b/include/uapi/linux/if_packet.h
index 9e7edfd8141e..4df96a7dd4fa 100644
--- a/include/uapi/linux/if_packet.h
+++ b/include/uapi/linux/if_packet.h
@@ -66,6 +66,7 @@ struct sockaddr_ll {
#define PACKET_FANOUT_CBPF 6
#define PACKET_FANOUT_EBPF 7
#define PACKET_FANOUT_FLAG_ROLLOVER 0x1000
+#define PACKET_FANOUT_FLAG_UNIQUEID 0x2000
#define PACKET_FANOUT_FLAG_DEFRAG 0x8000
struct tpacket_stats {