eb1d164143
This patch adds the core functionality of IGMP snooping support without actually hooking it up. So this patch should be a no-op as far as the bridge's external behaviour is concerned. All the new code and data is controlled by the Kconfig option BRIDGE_IGMP_SNOOPING. A run-time toggle is also available. The multicast switching is done using an hash table that is lockless on the read-side through RCU. On the write-side the new multicast_lock is used for all operations. The hash table supports dynamic growth/rehashing. The hash table will be rehashed if any chain length exceeds a preset limit. If rehashing does not reduce the maximum chain length then snooping will be disabled. These features may be added in future (in no particular order): * IGMPv3 source support * Non-querier router detection * IPv6 Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
46 lines
1.5 KiB
Plaintext
46 lines
1.5 KiB
Plaintext
#
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# 802.1d Ethernet Bridging
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#
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config BRIDGE
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tristate "802.1d Ethernet Bridging"
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select LLC
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select STP
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---help---
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If you say Y here, then your Linux box will be able to act as an
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Ethernet bridge, which means that the different Ethernet segments it
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is connected to will appear as one Ethernet to the participants.
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Several such bridges can work together to create even larger
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networks of Ethernets using the IEEE 802.1 spanning tree algorithm.
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As this is a standard, Linux bridges will cooperate properly with
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other third party bridge products.
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In order to use the Ethernet bridge, you'll need the bridge
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configuration tools; see <file:Documentation/networking/bridge.txt>
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for location. Please read the Bridge mini-HOWTO for more
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information.
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If you enable iptables support along with the bridge support then you
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turn your bridge into a bridging IP firewall.
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iptables will then see the IP packets being bridged, so you need to
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take this into account when setting up your firewall rules.
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Enabling arptables support when bridging will let arptables see
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bridged ARP traffic in the arptables FORWARD chain.
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To compile this code as a module, choose M here: the module
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will be called bridge.
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If unsure, say N.
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config BRIDGE_IGMP_SNOOPING
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bool "IGMP snooping"
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default y
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---help---
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If you say Y here, then the Ethernet bridge will be able selectively
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forward multicast traffic based on IGMP traffic received from each
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port.
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Say N to exclude this support and reduce the binary size.
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If unsure, say Y.
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