From 718d4ad98e272daebc258e49dc02f52a6a8de9d3 Mon Sep 17 00:00:00 2001 From: Fabian Hugelshofer Date: Mon, 9 Jun 2008 15:59:40 -0700 Subject: [PATCH] netfilter: nf_conntrack: properly account terminating packets Currently the last packet of a connection isn't accounted when its causing abnormal termination. Introduces nf_ct_kill_acct() which increments the accounting counters on conntrack kill. The new function was necessary, because there are calls to nf_ct_kill() which don't need accounting: nf_conntrack_proto_tcp.c line ~847: Kills ct and returns NF_REPEAT. We don't want to count twice. nf_conntrack_proto_tcp.c line ~880: Kills ct and returns NF_DROP. I think we don't want to count dropped packets. nf_conntrack_netlink.c line ~824: As far as I can see ctnetlink_del_conntrack() is used to destroy a conntrack on behalf of the user. There is an sk_buff, but I don't think this is an actual packet. Incrementing counters here is therefore not desired. Signed-off-by: Fabian Hugelshofer Signed-off-by: Patrick McHardy Signed-off-by: David S. Miller --- include/net/netfilter/nf_conntrack.h | 19 ++++++++++++++++++- net/ipv4/netfilter/nf_conntrack_proto_icmp.c | 2 +- .../netfilter/nf_conntrack_proto_icmpv6.c | 2 +- net/netfilter/nf_conntrack_core.c | 16 ++++++++++++++-- net/netfilter/nf_conntrack_proto_dccp.c | 2 +- net/netfilter/nf_conntrack_proto_tcp.c | 2 +- 6 files changed, 36 insertions(+), 7 deletions(-) diff --git a/include/net/netfilter/nf_conntrack.h b/include/net/netfilter/nf_conntrack.h index fc19ab23eea..d77dec768dc 100644 --- a/include/net/netfilter/nf_conntrack.h +++ b/include/net/netfilter/nf_conntrack.h @@ -223,7 +223,24 @@ static inline void nf_ct_refresh(struct nf_conn *ct, __nf_ct_refresh_acct(ct, 0, skb, extra_jiffies, 0); } -extern void nf_ct_kill(struct nf_conn *ct); +extern void __nf_ct_kill_acct(struct nf_conn *ct, + enum ip_conntrack_info ctinfo, + const struct sk_buff *skb, + int do_acct); + +/* kill conntrack and do accounting */ +static inline void nf_ct_kill_acct(struct nf_conn *ct, + enum ip_conntrack_info ctinfo, + const struct sk_buff *skb) +{ + __nf_ct_kill_acct(ct, ctinfo, skb, 1); +} + +/* kill conntrack without accounting */ +static inline void nf_ct_kill(struct nf_conn *ct) +{ + __nf_ct_kill_acct(ct, 0, NULL, 0); +} /* These are for NAT. Icky. */ /* Update TCP window tracking data when NAT mangles the packet */ diff --git a/net/ipv4/netfilter/nf_conntrack_proto_icmp.c b/net/ipv4/netfilter/nf_conntrack_proto_icmp.c index 0e21a46184f..97791048fa9 100644 --- a/net/ipv4/netfilter/nf_conntrack_proto_icmp.c +++ b/net/ipv4/netfilter/nf_conntrack_proto_icmp.c @@ -88,7 +88,7 @@ static int icmp_packet(struct nf_conn *ct, (theoretically possible with SMP) */ if (CTINFO2DIR(ctinfo) == IP_CT_DIR_REPLY) { if (atomic_dec_and_test(&ct->proto.icmp.count)) - nf_ct_kill(ct); + nf_ct_kill_acct(ct, ctinfo, skb); } else { atomic_inc(&ct->proto.icmp.count); nf_conntrack_event_cache(IPCT_PROTOINFO_VOLATILE, skb); diff --git a/net/ipv6/netfilter/nf_conntrack_proto_icmpv6.c b/net/ipv6/netfilter/nf_conntrack_proto_icmpv6.c index fe081b90e05..14d47d83354 100644 --- a/net/ipv6/netfilter/nf_conntrack_proto_icmpv6.c +++ b/net/ipv6/netfilter/nf_conntrack_proto_icmpv6.c @@ -90,7 +90,7 @@ static int icmpv6_packet(struct nf_conn *ct, (theoretically possible with SMP) */ if (CTINFO2DIR(ctinfo) == IP_CT_DIR_REPLY) { if (atomic_dec_and_test(&ct->proto.icmp.count)) - nf_ct_kill(ct); + nf_ct_kill_acct(ct, ctinfo, skb); } else { atomic_inc(&ct->proto.icmp.count); nf_conntrack_event_cache(IPCT_PROTOINFO_VOLATILE, skb); diff --git a/net/netfilter/nf_conntrack_core.c b/net/netfilter/nf_conntrack_core.c index 79b07c35eb8..e6d645221d5 100644 --- a/net/netfilter/nf_conntrack_core.c +++ b/net/netfilter/nf_conntrack_core.c @@ -848,12 +848,24 @@ acct: } EXPORT_SYMBOL_GPL(__nf_ct_refresh_acct); -void nf_ct_kill(struct nf_conn *ct) +void __nf_ct_kill_acct(struct nf_conn *ct, + enum ip_conntrack_info ctinfo, + const struct sk_buff *skb, + int do_acct) { +#ifdef CONFIG_NF_CT_ACCT + if (do_acct) { + spin_lock_bh(&nf_conntrack_lock); + ct->counters[CTINFO2DIR(ctinfo)].packets++; + ct->counters[CTINFO2DIR(ctinfo)].bytes += + skb->len - skb_network_offset(skb); + spin_unlock_bh(&nf_conntrack_lock); + } +#endif if (del_timer(&ct->timeout)) ct->timeout.function((unsigned long)ct); } -EXPORT_SYMBOL_GPL(nf_ct_kill); +EXPORT_SYMBOL_GPL(__nf_ct_kill_acct); #if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE) diff --git a/net/netfilter/nf_conntrack_proto_dccp.c b/net/netfilter/nf_conntrack_proto_dccp.c index 223742f371f..e7866dd3cde 100644 --- a/net/netfilter/nf_conntrack_proto_dccp.c +++ b/net/netfilter/nf_conntrack_proto_dccp.c @@ -475,7 +475,7 @@ static int dccp_packet(struct nf_conn *ct, const struct sk_buff *skb, if (type == DCCP_PKT_RESET && !test_bit(IPS_SEEN_REPLY_BIT, &ct->status)) { /* Tear down connection immediately if only reply is a RESET */ - nf_ct_kill(ct); + nf_ct_kill_acct(ct, ctinfo, skb); return NF_ACCEPT; } diff --git a/net/netfilter/nf_conntrack_proto_tcp.c b/net/netfilter/nf_conntrack_proto_tcp.c index c4aa11e0140..8db13fba10b 100644 --- a/net/netfilter/nf_conntrack_proto_tcp.c +++ b/net/netfilter/nf_conntrack_proto_tcp.c @@ -959,7 +959,7 @@ static int tcp_packet(struct nf_conn *ct, problem case, so we can delete the conntrack immediately. --RR */ if (th->rst) { - nf_ct_kill(ct); + nf_ct_kill_acct(ct, ctinfo, skb); return NF_ACCEPT; } } else if (!test_bit(IPS_ASSURED_BIT, &ct->status) -- 2.20.1