taglinefilesource code
send_tail622net/inet/af_inet.csk->send_tail = NULL;
send_tail1746net/inet/ip.csk->send_tail = skb;
send_tail1751net/inet/ip.csk->send_tail->link3 = skb;
send_tail1752net/inet/ip.csk->send_tail = skb;
send_tail93net/inet/sock.hstruct sk_buff    * volatile send_tail;
send_tail1970net/inet/tcp.cnewsk->send_tail = NULL;
send_tail2470net/inet/tcp.csk->send_tail = skb;
send_tail2483net/inet/tcp.csk->send_tail = skb;
send_tail2575net/inet/tcp.csk->send_tail = NULL;
send_tail2607net/inet/tcp.csk->send_tail = skb;
send_tail2611net/inet/tcp.csk->send_tail->link3 = skb;
send_tail2612net/inet/tcp.csk->send_tail = skb;
send_tail2620net/inet/tcp.cif (sk->send_tail == NULL || sk->send_head == NULL) 
send_tail2623net/inet/tcp.csk->send_tail = NULL;
send_tail2794net/inet/tcp.csk->send_tail = NULL;