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Message-ID: <20240829144641.3880376-3-edumazet@google.com>
Date: Thu, 29 Aug 2024 14:46:40 +0000
From: Eric Dumazet <edumazet@...gle.com>
To: "David S . Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>
Cc: David Ahern <dsahern@...nel.org>, Willy Tarreau <w@....eu>, Keyu Man <keyu.man@...il.ucr.edu>,
Jesper Dangaard Brouer <hawk@...nel.org>, netdev@...r.kernel.org, eric.dumazet@...il.com,
Eric Dumazet <edumazet@...gle.com>
Subject: [PATCH v2 net-next 2/3] icmp: move icmp_global.credit and
icmp_global.stamp to per netns storage
Host wide ICMP ratelimiter should be per netns, to provide better isolation.
Following patch in this series makes the sysctl per netns.
Signed-off-by: Eric Dumazet <edumazet@...gle.com>
Reviewed-by: David Ahern <dsahern@...nel.org>
---
include/net/ip.h | 4 ++--
include/net/netns/ipv4.h | 3 ++-
net/ipv4/icmp.c | 26 +++++++++++---------------
net/ipv6/icmp.c | 4 ++--
4 files changed, 17 insertions(+), 20 deletions(-)
diff --git a/include/net/ip.h b/include/net/ip.h
index 82248813619e3f21e09d52976accbdc76c7668c2..d3bca4e83979f681c4931e9ff62db5941a059c11 100644
--- a/include/net/ip.h
+++ b/include/net/ip.h
@@ -794,8 +794,8 @@ static inline void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb)
ip_cmsg_recv_offset(msg, skb->sk, skb, 0, 0);
}
-bool icmp_global_allow(void);
-void icmp_global_consume(void);
+bool icmp_global_allow(struct net *net);
+void icmp_global_consume(struct net *net);
extern int sysctl_icmp_msgs_per_sec;
extern int sysctl_icmp_msgs_burst;
diff --git a/include/net/netns/ipv4.h b/include/net/netns/ipv4.h
index 5fcd61ada62289253844be9cbe25387dd92385a5..54fe7c079fffb285b7a8a069f3d57f9440a6655a 100644
--- a/include/net/netns/ipv4.h
+++ b/include/net/netns/ipv4.h
@@ -122,7 +122,8 @@ struct netns_ipv4 {
u8 sysctl_icmp_errors_use_inbound_ifaddr;
int sysctl_icmp_ratelimit;
int sysctl_icmp_ratemask;
-
+ atomic_t icmp_global_credit;
+ u32 icmp_global_stamp;
u32 ip_rt_min_pmtu;
int ip_rt_mtu_expires;
int ip_rt_min_advmss;
diff --git a/net/ipv4/icmp.c b/net/ipv4/icmp.c
index 0078e8fb2e86d0552ef85eb5bf5bef947b0f1c3d..2e1d81dbdbb6fe93ea53398bbe3b3627b35852b0 100644
--- a/net/ipv4/icmp.c
+++ b/net/ipv4/icmp.c
@@ -223,19 +223,15 @@ static inline void icmp_xmit_unlock(struct sock *sk)
int sysctl_icmp_msgs_per_sec __read_mostly = 1000;
int sysctl_icmp_msgs_burst __read_mostly = 50;
-static struct {
- atomic_t credit;
- u32 stamp;
-} icmp_global;
-
/**
* icmp_global_allow - Are we allowed to send one more ICMP message ?
+ * @net: network namespace
*
* Uses a token bucket to limit our ICMP messages to ~sysctl_icmp_msgs_per_sec.
* Returns false if we reached the limit and can not send another packet.
* Works in tandem with icmp_global_consume().
*/
-bool icmp_global_allow(void)
+bool icmp_global_allow(struct net *net)
{
u32 delta, now, oldstamp;
int incr, new, old;
@@ -244,11 +240,11 @@ bool icmp_global_allow(void)
* Then later icmp_global_consume() could consume more credits,
* this is an acceptable race.
*/
- if (atomic_read(&icmp_global.credit) > 0)
+ if (atomic_read(&net->ipv4.icmp_global_credit) > 0)
return true;
now = jiffies;
- oldstamp = READ_ONCE(icmp_global.stamp);
+ oldstamp = READ_ONCE(net->ipv4.icmp_global_stamp);
delta = min_t(u32, now - oldstamp, HZ);
if (delta < HZ / 50)
return false;
@@ -257,23 +253,23 @@ bool icmp_global_allow(void)
if (!incr)
return false;
- if (cmpxchg(&icmp_global.stamp, oldstamp, now) == oldstamp) {
- old = atomic_read(&icmp_global.credit);
+ if (cmpxchg(&net->ipv4.icmp_global_stamp, oldstamp, now) == oldstamp) {
+ old = atomic_read(&net->ipv4.icmp_global_credit);
do {
new = min(old + incr, READ_ONCE(sysctl_icmp_msgs_burst));
- } while (!atomic_try_cmpxchg(&icmp_global.credit, &old, new));
+ } while (!atomic_try_cmpxchg(&net->ipv4.icmp_global_credit, &old, new));
}
return true;
}
EXPORT_SYMBOL(icmp_global_allow);
-void icmp_global_consume(void)
+void icmp_global_consume(struct net *net)
{
int credits = get_random_u32_below(3);
/* Note: this might make icmp_global.credit negative. */
if (credits)
- atomic_sub(credits, &icmp_global.credit);
+ atomic_sub(credits, &net->ipv4.icmp_global_credit);
}
EXPORT_SYMBOL(icmp_global_consume);
@@ -299,7 +295,7 @@ static bool icmpv4_global_allow(struct net *net, int type, int code,
if (icmpv4_mask_allow(net, type, code))
return true;
- if (icmp_global_allow()) {
+ if (icmp_global_allow(net)) {
*apply_ratelimit = true;
return true;
}
@@ -337,7 +333,7 @@ static bool icmpv4_xrlim_allow(struct net *net, struct rtable *rt,
if (!rc)
__ICMP_INC_STATS(net, ICMP_MIB_RATELIMITHOST);
else
- icmp_global_consume();
+ icmp_global_consume(net);
return rc;
}
diff --git a/net/ipv6/icmp.c b/net/ipv6/icmp.c
index 46f70e4a835139ef7d8925c49440865355048193..071b0bc1179d81b18c340ce415cef21e02a30cd7 100644
--- a/net/ipv6/icmp.c
+++ b/net/ipv6/icmp.c
@@ -181,7 +181,7 @@ static bool icmpv6_global_allow(struct net *net, int type,
if (icmpv6_mask_allow(net, type))
return true;
- if (icmp_global_allow()) {
+ if (icmp_global_allow(net)) {
*apply_ratelimit = true;
return true;
}
@@ -231,7 +231,7 @@ static bool icmpv6_xrlim_allow(struct sock *sk, u8 type,
__ICMP6_INC_STATS(net, ip6_dst_idev(dst),
ICMP6_MIB_RATELIMITHOST);
else
- icmp_global_consume();
+ icmp_global_consume(net);
dst_release(dst);
return res;
}
--
2.46.0.295.g3b9ea8a38a-goog
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