tcp_trim_head 460 include/net/tcp.h extern int tcp_trim_head(struct sock *, struct sk_buff *, u32); tcp_trim_head 2823 net/ipv4/tcp_input.c if (tcp_trim_head(sk, skb, tp->snd_una - TCP_SKB_CB(skb)->seq)) tcp_trim_head 1915 net/ipv4/tcp_output.c if (tcp_trim_head(sk, skb, tp->snd_una - TCP_SKB_CB(skb)->seq))