From mboxrd@z Thu Jan 1 00:00:00 1970 From: Nikolay Aleksandrov Subject: [PATCH net-next v2 5/6] inet: frags: use INET_FRAG_EVICTED to prevent icmp messages Date: Fri, 1 Aug 2014 12:29:47 +0200 Message-ID: <1406888988-20742-6-git-send-email-nikolay@redhat.com> References: <1406888988-20742-1-git-send-email-nikolay@redhat.com> Cc: Hannes Frederic Sowa , Florian Westphal , Nikolay Aleksandrov , "David S. Miller" , Alexey Kuznetsov , James Morris , Hideaki YOSHIFUJI , Patrick McHardy , Alexander Aring , Eric Dumazet To: netdev@vger.kernel.org Return-path: Received: from mx1.redhat.com ([209.132.183.28]:41186 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754685AbaHAKbE (ORCPT ); Fri, 1 Aug 2014 06:31:04 -0400 In-Reply-To: <1406888988-20742-1-git-send-email-nikolay@redhat.com> Sender: netdev-owner@vger.kernel.org List-ID: Now that we have INET_FRAG_EVICTED we might as well use it to stop sending icmp messages in the "frag_expire" functions instead of stripping INET_FRAG_FIRST_IN from their flags when evicting. Also fix the comment style in ip6_expire_frag_queue(). Signed-off-by: Nikolay Aleksandrov Reviewed-by: Florian Westphal --- v2: no changes net/ipv4/inet_fragment.c | 2 -- net/ipv4/ip_fragment.c | 14 +++++++------- net/ipv6/reassembly.c | 15 ++++++++------- 3 files changed, 15 insertions(+), 16 deletions(-) diff --git a/net/ipv4/inet_fragment.c b/net/ipv4/inet_fragment.c index fa49916c23a0..4baa76c60398 100644 --- a/net/ipv4/inet_fragment.c +++ b/net/ipv4/inet_fragment.c @@ -151,8 +151,6 @@ evict_again: goto evict_again; } - /* suppress xmit of (icmp) error packet */ - fq->flags &= ~INET_FRAG_FIRST_IN; fq->flags |= INET_FRAG_EVICTED; hlist_del(&fq->list); hlist_add_head(&fq->list, &expired); diff --git a/net/ipv4/ip_fragment.c b/net/ipv4/ip_fragment.c index 6fce1ecc5bca..cb56bcc1eee2 100644 --- a/net/ipv4/ip_fragment.c +++ b/net/ipv4/ip_fragment.c @@ -189,16 +189,18 @@ static void ip_expire(unsigned long arg) goto out; ipq_kill(qp); - - if (!(qp->q.flags & INET_FRAG_EVICTED)) - IP_INC_STATS_BH(net, IPSTATS_MIB_REASMTIMEOUT); IP_INC_STATS_BH(net, IPSTATS_MIB_REASMFAILS); - if ((qp->q.flags & INET_FRAG_FIRST_IN) && qp->q.fragments != NULL) { + if (!(qp->q.flags & INET_FRAG_EVICTED)) { struct sk_buff *head = qp->q.fragments; const struct iphdr *iph; int err; + IP_INC_STATS_BH(net, IPSTATS_MIB_REASMTIMEOUT); + + if (!(qp->q.flags & INET_FRAG_FIRST_IN) || !qp->q.fragments) + goto out; + rcu_read_lock(); head->dev = dev_get_by_index_rcu(net, qp->iif); if (!head->dev) @@ -211,8 +213,7 @@ static void ip_expire(unsigned long arg) if (err) goto out_rcu_unlock; - /* - * Only an end host needs to send an ICMP + /* Only an end host needs to send an ICMP * "Fragment Reassembly Timeout" message, per RFC792. */ if (qp->user == IP_DEFRAG_AF_PACKET || @@ -221,7 +222,6 @@ static void ip_expire(unsigned long arg) (skb_rtable(head)->rt_type != RTN_LOCAL))) goto out_rcu_unlock; - /* Send an ICMP "Fragment Reassembly Timeout" message. */ icmp_send(head, ICMP_TIME_EXCEEDED, ICMP_EXC_FRAGTIME, 0); out_rcu_unlock: diff --git a/net/ipv6/reassembly.c b/net/ipv6/reassembly.c index b4baceed0d0d..beb6872a8fa5 100644 --- a/net/ipv6/reassembly.c +++ b/net/ipv6/reassembly.c @@ -141,19 +141,20 @@ void ip6_expire_frag_queue(struct net *net, struct frag_queue *fq, if (!dev) goto out_rcu_unlock; - if (!(fq->q.flags & INET_FRAG_EVICTED)) - IP6_INC_STATS_BH(net, __in6_dev_get(dev), - IPSTATS_MIB_REASMTIMEOUT); IP6_INC_STATS_BH(net, __in6_dev_get(dev), IPSTATS_MIB_REASMFAILS); + if (fq->q.flags & INET_FRAG_EVICTED) + goto out_rcu_unlock; + + IP6_INC_STATS_BH(net, __in6_dev_get(dev), IPSTATS_MIB_REASMTIMEOUT); + /* Don't send error if the first segment did not arrive. */ if (!(fq->q.flags & INET_FRAG_FIRST_IN) || !fq->q.fragments) goto out_rcu_unlock; - /* - But use as source device on which LAST ARRIVED - segment was received. And do not use fq->dev - pointer directly, device might already disappeared. + /* But use as source device on which LAST ARRIVED + * segment was received. And do not use fq->dev + * pointer directly, device might already disappeared. */ fq->q.fragments->dev = dev; icmpv6_send(fq->q.fragments, ICMPV6_TIME_EXCEED, ICMPV6_EXC_FRAGTIME, 0); -- 1.9.3