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    SubjectRe: [TOMOYO 14/15](repost) LSM expansion for TOMOYO Linux.
    On Tue, 2 Oct 2007, Kentaro Takeda wrote:


    > --- linux-2.6.orig/net/core/datagram.c 2007-10-02 11:11:51.000000000 +0900
    > +++ linux-2.6/net/core/datagram.c 2007-10-02 11:26:23.000000000 +0900
    > @@ -55,6 +55,7 @@
    > #include <net/checksum.h>
    > #include <net/sock.h>
    > #include <net/tcp_states.h>
    > +#include <linux/security.h>
    >
    > /*
    > * Is a socket 'connection oriented' ?
    > @@ -178,6 +179,27 @@ struct sk_buff *skb_recv_datagram(struct
    > } else
    > skb = skb_dequeue(&sk->sk_receive_queue);
    >
    > + error = security_post_recv_datagram(sk, skb, flags);
    > + if (error) {
    > + unsigned long cpu_flags;
    > +
    > + if (!(flags & MSG_PEEK))
    > + goto no_peek;
    > +
    > + spin_lock_irqsave(&sk->sk_receive_queue.lock,
    > + cpu_flags);
    > + if (skb == skb_peek(&sk->sk_receive_queue)) {
    > + __skb_unlink(skb,
    > + &sk->sk_receive_queue);
    > + atomic_dec(&skb->users);
    > + }
    > + spin_unlock_irqrestore(&sk->sk_receive_queue.lock,
    > + cpu_flags);
    > +no_peek:
    > + skb_free_datagram(sk, skb);
    > + goto no_packet;
    > + }
    > +
    > if (skb)
    > return skb;

    I'm guessing you need this to determine the receiving process, rather than
    the socket (which is available via security_sock_rcv_skb()).

    If so, is this to interactively determine from the user or admin whether
    the packet should be accepted/denied for the receiving process?


    - James
    --
    James Morris
    <jmorris@namei.org>
    -
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