ip_icmp_error 388 include/net/ip.h extern void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err, ip_icmp_error 255 net/ipv4/raw.c ip_icmp_error(sk, skb, err, 0, info, payload); ip_icmp_error 385 net/ipv4/udp.c ip_icmp_error(sk, skb, err, uh->dest, info, (u8*)(uh+1));