struct sk_buff与socket

/**
 * struct socket - general BSD socket
 * @state: socket state (%SS_CONNECTED, etc)
 * @type: socket type (%SOCK_STREAM, etc)
 * @flags: socket flags (%SOCK_ASYNC_NOSPACE, etc)
 * @ops: protocol specific socket operations
 * @file: File back pointer for gc
 * @sk: internal networking protocol agnostic socket representation
 * @wq: wait queue for several uses
 */
struct socket {
    socket_state        state;

    kmemcheck_bitfield_begin(type);
    short            type;
    kmemcheck_bitfield_end(type);

    unsigned long        flags;

    struct socket_wq    *wq;

    struct file        *file;
    struct sock        *sk;
    const struct proto_ops    *ops;
};

struct sock {
    /*
     * Now struct inet_timewait_sock also uses sock_common, so please just
     * don't add nothing before this first member (__sk_common) --acme
     */
    struct sock_common    __sk_common;
    /* skip some codes */
    int sk_rcvbuf;
    /* skip some codes */
    int sk_sndbuf;
    struct sk_buff_head    sk_receive_queue;
    struct sk_buff_head    sk_write_queue;

}；

struct sk_buff_head {
    /* These two members must be first. */
    struct sk_buff    *next;
    struct sk_buff    *prev;

    __u32        qlen;
    spinlock_t    lock;
};