From: Yang Zhenzhang <yangzhenzhang@xxxxxxxxxx>
Now, kernel allows each net namespace to independently set up its levels
for tcp memory pressure thresholds.
But it seems there is a bug, as using the following steps:
[root@host socket]# lxc-start -n test -f config /bin/bash
[root@net-test socket]# ip route add default via 192.168.58.2
[root@net-test socket]# echo 0 0 0 > /proc/sys/net/ipv4/tcp_mem
[root@net-test socket]# scp root@192.168.58.174:/home/tcp_mem_test .
and it still can transport the "tcp_mem_test" file which we hope it
would not.
It's because inet_init() (net/ipv4/af_inet.c)initialize the tcp_prot.sysctl_mem:
tcp_prot.sysctl_mem = init_net.ipv4.sysctl_tcp_mem;
So when the protocal is TCP, sk->sk_prot->sysctl_mem(following code)
always use the ipv4 sysctl_tcp_mem of init_net namespace rather than
it's own net namespace.
This patch simply set "prot" equal to net->ipv4.sysctl_tcp_mem when
the protocol type is TCP.
Signed-off-by: Yang Zhenzhang <yangzhenzhang@xxxxxxxxxx>
Signed-off-by: Huang Qiang <h.huangqiang@xxxxxxxxxx>
---
include/net/sock.h | 24 ++++++++++++++++--------
1 files changed, 16 insertions(+), 8 deletions(-)
diff --git a/include/net/sock.h b/include/net/sock.h
index 4a45216..ee85d8b 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -59,6 +59,7 @@
#include <linux/static_key.h>
#include <linux/aio.h>
#include <linux/sched.h>
+#include <linux/in.h>
#include <linux/filter.h>
#include <linux/rculist_nulls.h>
@@ -1060,14 +1061,6 @@ static inline void sk_enter_memory_pressure(struct sock *sk)
sk->sk_prot->enter_memory_pressure(sk);
}
-static inline long sk_prot_mem_limits(const struct sock *sk, int index)
-{
- long *prot = sk->sk_prot->sysctl_mem;
- if (mem_cgroup_sockets_enabled && sk->sk_cgrp)
- prot = sk->sk_cgrp->sysctl_mem;
- return prot[index];
-}
-
static inline void memcg_memory_allocated_add(struct cg_proto *prot,
unsigned long amt,
int *parent_status)
@@ -2150,6 +2143,21 @@ static inline void sk_change_net(struct sock *sk, struct net *net)
sock_net_set(sk, hold_net(net));
}
+static inline long sk_prot_mem_limits(const struct sock *sk, int index)
+{
+ long *prot = sk->sk_prot->sysctl_mem;
+
+ if (sk->sk_protocol == IPPROTO_TCP) {
+ struct net *net = sock_net(sk);
+ prot = net->ipv4.sysctl_tcp_mem;
+ }
+
+ if (mem_cgroup_sockets_enabled && sk->sk_cgrp)
+ prot = sk->sk_cgrp->sysctl_mem;
+
+ return prot[index];
+}
+
static inline struct sock *skb_steal_sock(struct sk_buff *skb)
{
if (unlikely(skb->sk)) {
--
1.7.1
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