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authorDaniel Borkmann <dborkman@redhat.com>2013-06-21 21:38:08 +0400
committerDavid S. Miller <davem@davemloft.net>2013-06-25 03:39:05 +0400
commite4fc408e0e99fd2e009c8b3702d9637f5554fd5c (patch)
treef808ee97e82aaeea7c5fce0dea7ae37610ad27cb /drivers/net/Makefile
parentbcbde0d449eda7afa8f63280b165c8300dbd00e2 (diff)
downloadlinux-e4fc408e0e99fd2e009c8b3702d9637f5554fd5c.tar.xz
packet: nlmon: virtual netlink monitoring device for packet sockets
Currently, there is no good possibility to debug netlink traffic that is being exchanged between kernel and user space. Therefore, this patch implements a netlink virtual device, so that netlink messages will be made visible to PF_PACKET sockets. Once there was an approach with a similar idea [1], but it got forgotten somehow. I think it makes most sense to accept the "overhead" of an extra netlink net device over implementing the same functionality from PF_PACKET sockets once again into netlink sockets. We have BPF filters that can already be easily applied which even have netlink extensions, we have RX_RING zero-copy between kernel- and user space that can be reused, and much more features. So instead of re-implementing all of this, we simply pass the skb to a given PF_PACKET socket for further analysis. Another nice benefit that comes from that is that no code needs to be changed in user space packet analyzers (maybe adding a dissector, but not more), thus out of the box, we can already capture pcap files of netlink traffic to debug/troubleshoot netlink problems. Also thanks goes to Thomas Graf, Flavio Leitner, Jesper Dangaard Brouer. [1] http://marc.info/?l=linux-netdev&m=113813401516110 Signed-off-by: Daniel Borkmann <dborkman@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/Makefile')
-rw-r--r--drivers/net/Makefile1
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/net/Makefile b/drivers/net/Makefile
index ef3d090efedf..3fef8a81c0f6 100644
--- a/drivers/net/Makefile
+++ b/drivers/net/Makefile
@@ -22,6 +22,7 @@ obj-$(CONFIG_TUN) += tun.o
obj-$(CONFIG_VETH) += veth.o
obj-$(CONFIG_VIRTIO_NET) += virtio_net.o
obj-$(CONFIG_VXLAN) += vxlan.o
+obj-$(CONFIG_NLMON) += nlmon.o
#
# Networking Drivers