提交 5cf42280 编写于 作者: A Andy Zhou 提交者: David S. Miller

ipv4: introduce frag_expire_skip_icmp()

Improve readability of skip ICMP for de-fragmentation expiration logic.
This change will also make the logic easier to maintain when the
following patches in this series are applied.
Signed-off-by: NAndy Zhou <azhou@nicira.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
上级 a2ad5d2a
......@@ -478,6 +478,16 @@ enum ip_defrag_users {
IP_DEFRAG_MACVLAN,
};
/* Return true if the value of 'user' is between 'lower_bond'
* and 'upper_bond' inclusively.
*/
static inline bool ip_defrag_user_in_between(u32 user,
enum ip_defrag_users lower_bond,
enum ip_defrag_users upper_bond)
{
return user >= lower_bond && user <= upper_bond;
}
int ip_defrag(struct sk_buff *skb, u32 user);
#ifdef CONFIG_INET
struct sk_buff *ip_check_defrag(struct sk_buff *skb, u32 user);
......
......@@ -173,6 +173,13 @@ static void ipq_kill(struct ipq *ipq)
inet_frag_kill(&ipq->q, &ip4_frags);
}
static bool frag_expire_skip_icmp(u32 user)
{
return user == IP_DEFRAG_AF_PACKET ||
ip_defrag_user_in_between(user, IP_DEFRAG_CONNTRACK_IN,
__IP_DEFRAG_CONNTRACK_IN_END);
}
/*
* Oops, a fragment queue timed out. Kill it and send an ICMP reply.
*/
......@@ -217,10 +224,8 @@ static void ip_expire(unsigned long arg)
/* Only an end host needs to send an ICMP
* "Fragment Reassembly Timeout" message, per RFC792.
*/
if (qp->user == IP_DEFRAG_AF_PACKET ||
((qp->user >= IP_DEFRAG_CONNTRACK_IN) &&
(qp->user <= __IP_DEFRAG_CONNTRACK_IN_END) &&
(skb_rtable(head)->rt_type != RTN_LOCAL)))
if (frag_expire_skip_icmp(qp->user) &&
(skb_rtable(head)->rt_type != RTN_LOCAL))
goto out_rcu_unlock;
/* Send an ICMP "Fragment Reassembly Timeout" message. */
......
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