Multicast group membership control for a container environment
The disclosure provides approaches for managing multicast group membership at a node. An approach includes policing whether a pod can join a multicast group based on one or more rules. The approach further includes updating forwarding tables of a virtual switch based on whether the pod is allowed to join the multicast group.
1 . A method comprising:
receiving, from a first pod, a multicast join request message to join a first multicast group;
determining, based on one or more multicast rules, whether the first pod is allowed to join the first multicast group;
based on determining the first pod is allowed to join the first multicast group, updating a multicast membership table stored in the node to indicate the first pod is a member of the first multicast group;
updating forwarding rules in a multicast forwarding table of a virtual switch to reflect the updated multicast membership table;
receiving, at the virtual switch, a first multicast packet with a source address and a destination address; and
determining whether to forward the first multicast packet to the first pod based at least in part on:
the multicast forwarding table;
the source address;
the destination address; and
a rule indicating whether packets associated with the first multicast group are to be forwarded based on one or more of the source address or the destination address.
2 . The method of claim 1 , wherein an agent operating on a virtual machine (VM) receives the multicast join request and determines whether the first pod is allowed to join the first multicast group, the method further comprising:
receiving, by the agent and from an agent controller running on a container orchestrator, the one or more multicast rules.
3 . The method of claim 2 further comprising:
compiling, by the agent, the multicast forwarding table based on the multicast membership table and one or more of egress rules, ingress rules, or control rules.
4 . The method of claim 1 , wherein determining whether to forward the first multicast packet comprises determining to forward the first multicast packet to the first pod based on the first pod being a member of the first multicast group and the destination address of the first multicast packet being associated with the first multicast group.
5 . The method of claim 1 , further comprising:
receiving, at the virtual switch, a second multicast packet with a destination address corresponding to a second multicast group; and
determining to not forward the second multicast packet to the first pod based on the first pod not being a member of the second multicast group and the destination address of the second multicast packet being associated with the second multicast group.
6 . The method of claim 1 , wherein determining whether to forward the first multicast packet comprises determining to not forward the first multicast packet based on the first pod being a member of the first multicast group, the destination address of the first multicast packet being associated with the first multicast group, and a rule indicating multicast packets associated with the first multicast group must be sent from an address other than the source address.
7 . The method of claim 1 , wherein determining whether to forward the first multicast packet comprises determining to not forward the first multicast packet based on the first pod being a member of the first multicast group, the destination address of the first multicast packet being associated with the first multicast group, and a rule indicating multicast packets associated with the first multicast group must be sent from an address other than the source address to be received by the first pod.
8 . The method of claim 1 further comprising forwarding the first multicast packet to the first pod based on the determining whether to forward the first multicast packet.
9 . A computer system comprising memory and one or more processors configured to perform operations comprising:
receiving, from a first pod, a multicast join request message to join a first multicast group;
determining, based on one or more multicast rules, whether the first pod is allowed to join the first multicast group;
based on determining the first pod is allowed to join the first multicast group, updating a multicast membership table stored in the node to indicate the first pod is a member of the first multicast group;
updating forwarding rules in a multicast forwarding table of a virtual switch to reflect the updated multicast membership table;
receiving, at the virtual switch, a first multicast packet with a source address and a destination address; and
determining whether to forward the first multicast packet to the first pod based at least in part on:
the multicast forwarding table;
the source address;
the destination address; and
a rule indicating whether packets associated with the first multicast group are to be forwarded based on one or more of the source address or the destination address.
10 . The computer system of claim 9 , wherein determining whether to forward the first multicast packet comprises determining to forward the first multicast packet to the first pod based on the first pod being a member of the first multicast group and the destination address of the first multicast packet being associated with the first multicast group.
11 . The computer system of claim 9 , wherein the operations further comprise:
receiving, at the virtual switch, a second multicast packet with a destination address corresponding to a second multicast group; and
determining to not forward the second multicast packet to the first pod based on the first pod not being a member of the second multicast group and the destination address of the second multicast packet being associated with the second multicast group.
12 . The computer system of claim 9 , wherein determining whether to forward the first multicast packet comprises determining to not forward the first multicast packet based on the first pod being a member of the first multicast group, the destination address of the first multicast packet being associated with the first multicast group, and a rule indicating multicast packets associated with the first multicast group must be sent from an address other than the source address.
13 . The computer system of claim 9 , wherein determining whether to forward the first multicast packet comprises determining to not forward the first multicast packet based on the first pod being a member of the first multicast group, the destination address of the first multicast packet being associated with the first multicast group, and a rule indicating multicast packets associated with the first multicast group must be sent from an address other than the source address to be received by the first pod.
14 . The computer system of claim 9 , wherein the operations further comprise forwarding the first multicast packet to the first pod based on the determining whether to forward the first multicast packet.
15 . A non-transitory computer-readable medium storing instructions, which when executed by a computer system, cause the computer system to perform operations comprising:
receiving, from a first pod, a multicast join request message to join a first multicast group;
determining, based on one or more multicast rules, whether the first pod is allowed to join the first multicast group;
based on determining the first pod is allowed to join the first multicast group, updating a multicast membership table stored in the node to indicate the first pod is a member of the first multicast group;
updating forwarding rules in a multicast forwarding table of a virtual switch to reflect the updated multicast membership table;
receiving, at the virtual switch, a first multicast packet with a source address and a destination address; and
determining whether to forward the first multicast packet to the first pod based at least in part on:
the multicast forwarding table;
the source address;
the destination address; and
a rule indicating whether packets associated with the first multicast group are to be forwarded based on one or more of the source address or the destination address.
16 . The non-transitory computer-readable medium of claim 15 , wherein determining whether to forward the first multicast packet comprises determining to forward the first multicast packet to the first pod based on the first pod being a member of the first multicast group and the destination address of the first multicast packet being associated with the first multicast group.
17 . The non-transitory computer-readable medium of claim 15 , wherein the operations further comprise:
receiving, at the virtual switch, a second multicast packet with a destination address corresponding to a second multicast group; and
determining to not forward the second multicast packet to the first pod based on the first pod not being a member of the second multicast group and the destination address of the second multicast packet being associated with the second multicast group.
18 . The non-transitory computer-readable medium of claim 15 , wherein determining whether to forward the first multicast packet comprises determining to not forward the first multicast packet based on the first pod being a member of the first multicast group, the destination address of the first multicast packet being associated with the first multicast group, and a rule indicating multicast packets associated with the first multicast group must be sent from an address other than the source address.
19 . The non-transitory computer-readable medium of claim 15 , wherein determining whether to forward the first multicast packet comprises determining to not forward the first multicast packet based on the first pod being a member of the first multicast group, the destination address of the first multicast packet being associated with the first multicast group, and a rule indicating multicast packets associated with the first multicast group must be sent from an address other than the source address to be received by the first pod.
20 . The non-transitory computer-readable medium of claim 15 , further comprising forwarding the first multicast packet to the first pod based on the determining whether to forward the first multicast packet.