socket

the inheriting of linux sock type

Data Structure

Every xsock has parent sock as its first filed.

  1. sock_common
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    157 struct sock_common {
    ...
    }
  2. sock
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     288 struct sock {
     289         /*
     290          * Now struct inet_timewait_sock also uses sock_common, so please just
     291          * don't add nothing before this first member (__sk_common) --acme
     292          */
     293         struct sock_common      __sk_common;
    ...
  3. inet_sock
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    37 struct inet_sock {
    138         /* sk and pinet6 has to be the first two members of inet_sock */
    139         struct sock             sk;
    ...
  4. inet_connection_sock
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     87 struct inet_connection_sock {
     88         /* inet_sock has to be the first member! */
     89         struct inet_sock          icsk_inet;
    ...
  5. tcp_sock
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    133 struct tcp_sock {
    134         /* inet_connection_sock has to be the first member of tcp_sock */
    135         struct inet_connection_sock     inet_conn;
    ...

转换函数：

sk to inet_sock
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213 static inline struct inet_sock *inet_sk(const struct sock *sk)
214 {
215         return (struct inet_sock *)sk;
216 }
sk to inet_connection_sock
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145 static inline struct inet_connection_sock *inet_csk(const struct sock *sk)
146 {
147         return (struct inet_connection_sock *)sk;
148 }
sk to tcp_sk
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351 static inline struct tcp_sock *tcp_sk(const struct sock *sk)
352 {
353         return (struct tcp_sock *)sk;
354 }

Inherit