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We will remove this restriction in llc_rcv() soon, which means that the protocol handler must be aware of netns. if (!net_eq(dev_net(dev), &init_net)) goto drop; llc_rcv() fetches llc_type_handlers[llc_pdu_type(skb) - 1] and calls it if not NULL. If the PDU type is LLC_DEST_SAP, llc_sap_handler() is called to pass skb to corresponding sockets. Then, we must look up a proper socket in the same netns with skb->dev. If the destination is a multicast address, llc_sap_handler() calls llc_sap_mcast(). It calculates a hash based on DSAP and skb->dev->ifindex, iterates on a socket list, and calls llc_mcast_match() to check if the socket is the correct destination. Then, llc_mcast_match() checks if skb->dev matches with llc_sk(sk)->dev. So, we need not check netns here. OTOH, if the destination is a unicast address, llc_sap_handler() calls llc_lookup_dgram() to look up a socket, but it does not check the netns. Therefore, we need to add netns check in llc_lookup_dgram(). Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com> Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.