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Date: Thu, 17 Sep 2015 14:40:46 +0900
From: Simon Horman <horms@...ge.net.au>
To: Pablo Neira Ayuso <pablo@...filter.org>
Cc: lvs-devel@...r.kernel.org, netdev@...r.kernel.org,
netfilter-devel@...r.kernel.org,
Wensong Zhang <wensong@...ux-vs.org>,
Julian Anastasov <ja@....bg>, Alex Gartrell <agartrell@...com>,
Simon Horman <horms@...ge.net.au>
Subject: [PATCH nf-next 10/15] ipvs: attempt to schedule icmp packets
From: Alex Gartrell <agartrell@...com>
Invoke the try_to_schedule logic from the icmp path and update it to the
appropriate ip_vs_conn_put function. The schedule functions have been
updated to reject the packets immediately for now.
Signed-off-by: Alex Gartrell <agartrell@...com>
Acked-by: Julian Anastasov <ja@....bg>
Signed-off-by: Simon Horman <horms@...ge.net.au>
---
net/netfilter/ipvs/ip_vs_core.c | 45 ++++++++++++++++++++++++++++-------
net/netfilter/ipvs/ip_vs_proto_sctp.c | 6 +++++
net/netfilter/ipvs/ip_vs_proto_tcp.c | 7 ++++++
net/netfilter/ipvs/ip_vs_proto_udp.c | 6 +++++
4 files changed, 55 insertions(+), 9 deletions(-)
diff --git a/net/netfilter/ipvs/ip_vs_core.c b/net/netfilter/ipvs/ip_vs_core.c
index 6465e7b3e891..99be6801c795 100644
--- a/net/netfilter/ipvs/ip_vs_core.c
+++ b/net/netfilter/ipvs/ip_vs_core.c
@@ -1409,7 +1409,7 @@ ip_vs_in_icmp(struct sk_buff *skb, int *related, unsigned int hooknum)
struct ip_vs_protocol *pp;
struct ip_vs_proto_data *pd;
unsigned int offset, offset2, ihl, verdict;
- bool ipip;
+ bool ipip, new_cp = false;
*related = 1;
@@ -1487,8 +1487,17 @@ ip_vs_in_icmp(struct sk_buff *skb, int *related, unsigned int hooknum)
* For IPIP this is error for request, not for reply.
*/
cp = pp->conn_in_get(AF_INET, skb, &ciph);
- if (!cp)
- return NF_ACCEPT;
+
+ if (!cp) {
+ int v;
+
+ if (!sysctl_schedule_icmp(net_ipvs(net)))
+ return NF_ACCEPT;
+
+ if (!ip_vs_try_to_schedule(AF_INET, skb, pd, &v, &cp, &ciph))
+ return v;
+ new_cp = true;
+ }
verdict = NF_DROP;
@@ -1565,7 +1574,10 @@ ignore_ipip:
verdict = ip_vs_icmp_xmit(skb, cp, pp, offset, hooknum, &ciph);
out:
- __ip_vs_conn_put(cp);
+ if (likely(!new_cp))
+ __ip_vs_conn_put(cp);
+ else
+ ip_vs_conn_put(cp);
return verdict;
}
@@ -1581,6 +1593,7 @@ static int ip_vs_in_icmp_v6(struct sk_buff *skb, int *related,
struct ip_vs_protocol *pp;
struct ip_vs_proto_data *pd;
unsigned int offset, verdict;
+ bool new_cp = false;
*related = 1;
@@ -1631,13 +1644,23 @@ static int ip_vs_in_icmp_v6(struct sk_buff *skb, int *related,
*/
cp = pp->conn_in_get(AF_INET6, skb, &ciph);
- if (!cp)
- return NF_ACCEPT;
+ if (!cp) {
+ int v;
+
+ if (!sysctl_schedule_icmp(net_ipvs(net)))
+ return NF_ACCEPT;
+
+ if (!ip_vs_try_to_schedule(AF_INET6, skb, pd, &v, &cp, &ciph))
+ return v;
+
+ new_cp = true;
+ }
+
/* VS/TUN, VS/DR and LOCALNODE just let it go */
if ((hooknum == NF_INET_LOCAL_OUT) &&
(IP_VS_FWD_METHOD(cp) != IP_VS_CONN_F_MASQ)) {
- __ip_vs_conn_put(cp);
- return NF_ACCEPT;
+ verdict = NF_ACCEPT;
+ goto out;
}
/* do the statistics and put it back */
@@ -1651,7 +1674,11 @@ static int ip_vs_in_icmp_v6(struct sk_buff *skb, int *related,
verdict = ip_vs_icmp_xmit_v6(skb, cp, pp, offset, hooknum, &ciph);
- __ip_vs_conn_put(cp);
+out:
+ if (likely(!new_cp))
+ __ip_vs_conn_put(cp);
+ else
+ ip_vs_conn_put(cp);
return verdict;
}
diff --git a/net/netfilter/ipvs/ip_vs_proto_sctp.c b/net/netfilter/ipvs/ip_vs_proto_sctp.c
index 5b84c0b56642..cd2984f3dad7 100644
--- a/net/netfilter/ipvs/ip_vs_proto_sctp.c
+++ b/net/netfilter/ipvs/ip_vs_proto_sctp.c
@@ -19,6 +19,12 @@ sctp_conn_schedule(int af, struct sk_buff *skb, struct ip_vs_proto_data *pd,
sctp_chunkhdr_t _schunkh, *sch;
sctp_sctphdr_t *sh, _sctph;
+ if (ip_vs_iph_icmp(iph)) {
+ /* TEMPORARY - do not schedule icmp yet */
+ *verdict = NF_ACCEPT;
+ return 0;
+ }
+
sh = skb_header_pointer(skb, iph->len, sizeof(_sctph), &_sctph);
if (sh == NULL) {
*verdict = NF_DROP;
diff --git a/net/netfilter/ipvs/ip_vs_proto_tcp.c b/net/netfilter/ipvs/ip_vs_proto_tcp.c
index 8e92beb0cca9..dbc707514f29 100644
--- a/net/netfilter/ipvs/ip_vs_proto_tcp.c
+++ b/net/netfilter/ipvs/ip_vs_proto_tcp.c
@@ -41,6 +41,12 @@ tcp_conn_schedule(int af, struct sk_buff *skb, struct ip_vs_proto_data *pd,
struct tcphdr _tcph, *th;
struct netns_ipvs *ipvs;
+ if (ip_vs_iph_icmp(iph)) {
+ /* TEMPORARY - do not schedule icmp yet */
+ *verdict = NF_ACCEPT;
+ return 0;
+ }
+
th = skb_header_pointer(skb, iph->len, sizeof(_tcph), &_tcph);
if (th == NULL) {
*verdict = NF_DROP;
@@ -48,6 +54,7 @@ tcp_conn_schedule(int af, struct sk_buff *skb, struct ip_vs_proto_data *pd,
}
net = skb_net(skb);
ipvs = net_ipvs(net);
+
/* No !th->ack check to allow scheduling on SYN+ACK for Active FTP */
rcu_read_lock();
if ((th->syn || sysctl_sloppy_tcp(ipvs)) && !th->rst &&
diff --git a/net/netfilter/ipvs/ip_vs_proto_udp.c b/net/netfilter/ipvs/ip_vs_proto_udp.c
index b62a3c0ff9bf..1403be250988 100644
--- a/net/netfilter/ipvs/ip_vs_proto_udp.c
+++ b/net/netfilter/ipvs/ip_vs_proto_udp.c
@@ -37,6 +37,12 @@ udp_conn_schedule(int af, struct sk_buff *skb, struct ip_vs_proto_data *pd,
struct ip_vs_service *svc;
struct udphdr _udph, *uh;
+ if (ip_vs_iph_icmp(iph)) {
+ /* TEMPORARY - do not schedule icmp yet */
+ *verdict = NF_ACCEPT;
+ return 0;
+ }
+
/* IPv6 fragments, only first fragment will hit this */
uh = skb_header_pointer(skb, iph->len, sizeof(_udph), &_udph);
if (uh == NULL) {
--
2.1.4
--
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