taglinefilesource code
link345include/linux/skbuff.hstruct sk_buff    * volatile link3;
link3328net/inet/af_inet.cskb2 = skb->link3;
link31771net/inet/ip.cnewskb->link3=NULL;
link31907net/inet/ip.cif (skb->link3 != NULL)
link31910net/inet/ip.cskb->link3 = NULL;
link31919net/inet/ip.csk->send_tail->link3 = skb;
link3429net/inet/skbuff.cskb->link3 = NULL;
link3506net/inet/skbuff.cn->link3=NULL;
link3461net/inet/tcp.cskb = skb->link3;
link32986net/inet/tcp.cskb2 = skb->link3;
link32987net/inet/tcp.cskb->link3 = NULL;
link33013net/inet/tcp.csk->send_tail->link3 = skb;
link33016net/inet/tcp.cskb->link3 = NULL;
link33106net/inet/tcp.cif (sk->send_head->link3 &&
link33107net/inet/tcp.cafter(sk->send_head->h.seq, sk->send_head->link3->h.seq)) 
link33127net/inet/tcp.cif (sk->send_head->link3)
link33194net/inet/tcp.csk->send_head = oskb->link3;