* [PATCH net-next] net: initialize net->net_cookie at netns setup
@ 2021-02-10 14:41 Eric Dumazet
2021-02-10 14:50 ` Daniel Borkmann
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: Eric Dumazet @ 2021-02-10 14:41 UTC (permalink / raw)
To: David S . Miller, Jakub Kicinski
Cc: netdev, Eric Dumazet, Eric Dumazet, Daniel Borkmann, Lorenz Bauer
From: Eric Dumazet <edumazet@google.com>
It is simpler to make net->net_cookie a plain u64
written once in setup_net() instead of looping
and using atomic64 helpers.
Lorenz Bauer wants to add SO_NETNS_COOKIE socket option
and this patch would makes his patch series simpler.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: Lorenz Bauer <lmb@cloudflare.com>
---
include/net/net_namespace.h | 4 +---
net/core/filter.c | 8 +++-----
net/core/net_namespace.c | 19 +++----------------
3 files changed, 7 insertions(+), 24 deletions(-)
diff --git a/include/net/net_namespace.h b/include/net/net_namespace.h
index 29567875f4280116200f0676d6d619f3d9b46279..dcaee24a4d8773ff3bb2adbe5fe9136dfc186184 100644
--- a/include/net/net_namespace.h
+++ b/include/net/net_namespace.h
@@ -165,7 +165,7 @@ struct net {
struct netns_xfrm xfrm;
#endif
- atomic64_t net_cookie; /* written once */
+ u64 net_cookie; /* written once */
#if IS_ENABLED(CONFIG_IP_VS)
struct netns_ipvs *ipvs;
@@ -224,8 +224,6 @@ extern struct list_head net_namespace_list;
struct net *get_net_ns_by_pid(pid_t pid);
struct net *get_net_ns_by_fd(int fd);
-u64 __net_gen_cookie(struct net *net);
-
#ifdef CONFIG_SYSCTL
void ipx_register_sysctl(void);
void ipx_unregister_sysctl(void);
diff --git a/net/core/filter.c b/net/core/filter.c
index 9ab94e90d66059702a7417ab844d4e8e5f4732c7..74bd401bf483d212884a026599167c1098e78d28 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -4645,11 +4645,9 @@ static const struct bpf_func_proto bpf_get_socket_cookie_sock_ops_proto = {
static u64 __bpf_get_netns_cookie(struct sock *sk)
{
-#ifdef CONFIG_NET_NS
- return __net_gen_cookie(sk ? sk->sk_net.net : &init_net);
-#else
- return 0;
-#endif
+ const struct net *net = sk ? sock_net(sk) : &init_net;
+
+ return net->net_cookie;
}
BPF_CALL_1(bpf_get_netns_cookie_sock, struct sock *, ctx)
diff --git a/net/core/net_namespace.c b/net/core/net_namespace.c
index 2ef3b4557f40d72d27a1642d98f1e8f06caf9835..43b6ac4c44395b55c966f3fb9141c25bb91848cf 100644
--- a/net/core/net_namespace.c
+++ b/net/core/net_namespace.c
@@ -72,18 +72,6 @@ static unsigned int max_gen_ptrs = INITIAL_NET_GEN_PTRS;
DEFINE_COOKIE(net_cookie);
-u64 __net_gen_cookie(struct net *net)
-{
- while (1) {
- u64 res = atomic64_read(&net->net_cookie);
-
- if (res)
- return res;
- res = gen_cookie_next(&net_cookie);
- atomic64_cmpxchg(&net->net_cookie, 0, res);
- }
-}
-
static struct net_generic *net_alloc_generic(void)
{
struct net_generic *ng;
@@ -332,6 +320,9 @@ static __net_init int setup_net(struct net *net, struct user_namespace *user_ns)
refcount_set(&net->ns.count, 1);
refcount_set(&net->passive, 1);
get_random_bytes(&net->hash_mix, sizeof(u32));
+ preempt_disable();
+ net->net_cookie = gen_cookie_next(&net_cookie);
+ preempt_enable();
net->dev_base_seq = 1;
net->user_ns = user_ns;
idr_init(&net->netns_ids);
@@ -1103,10 +1094,6 @@ static int __init net_ns_init(void)
rcu_assign_pointer(init_net.gen, ng);
- preempt_disable();
- __net_gen_cookie(&init_net);
- preempt_enable();
-
down_write(&pernet_ops_rwsem);
if (setup_net(&init_net, &init_user_ns))
panic("Could not setup the initial network namespace");
--
2.30.0.478.g8a0d178c01-goog
^ permalink raw reply related [flat|nested] 4+ messages in thread
* Re: [PATCH net-next] net: initialize net->net_cookie at netns setup
2021-02-10 14:41 [PATCH net-next] net: initialize net->net_cookie at netns setup Eric Dumazet
@ 2021-02-10 14:50 ` Daniel Borkmann
2021-02-11 11:31 ` Lorenz Bauer
2021-02-11 22:20 ` patchwork-bot+netdevbpf
2 siblings, 0 replies; 4+ messages in thread
From: Daniel Borkmann @ 2021-02-10 14:50 UTC (permalink / raw)
To: Eric Dumazet, David S . Miller, Jakub Kicinski
Cc: netdev, Eric Dumazet, Lorenz Bauer
On 2/10/21 3:41 PM, Eric Dumazet wrote:
> From: Eric Dumazet <edumazet@google.com>
>
> It is simpler to make net->net_cookie a plain u64
> written once in setup_net() instead of looping
> and using atomic64 helpers.
>
> Lorenz Bauer wants to add SO_NETNS_COOKIE socket option
> and this patch would makes his patch series simpler.
>
> Signed-off-by: Eric Dumazet <edumazet@google.com>
> Cc: Daniel Borkmann <daniel@iogearbox.net>
> Cc: Lorenz Bauer <lmb@cloudflare.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH net-next] net: initialize net->net_cookie at netns setup
2021-02-10 14:41 [PATCH net-next] net: initialize net->net_cookie at netns setup Eric Dumazet
2021-02-10 14:50 ` Daniel Borkmann
@ 2021-02-11 11:31 ` Lorenz Bauer
2021-02-11 22:20 ` patchwork-bot+netdevbpf
2 siblings, 0 replies; 4+ messages in thread
From: Lorenz Bauer @ 2021-02-11 11:31 UTC (permalink / raw)
To: Eric Dumazet
Cc: David S . Miller, Jakub Kicinski, netdev, Eric Dumazet, Daniel Borkmann
On Wed, 10 Feb 2021 at 14:41, Eric Dumazet <eric.dumazet@gmail.com> wrote:
>
> From: Eric Dumazet <edumazet@google.com>
>
> It is simpler to make net->net_cookie a plain u64
> written once in setup_net() instead of looping
> and using atomic64 helpers.
>
> Lorenz Bauer wants to add SO_NETNS_COOKIE socket option
> and this patch would makes his patch series simpler.
This is nice, thank you!
Tested-by: Lorenz Bauer <lmb@cloudflare.com>
--
Lorenz Bauer | Systems Engineer
6th Floor, County Hall/The Riverside Building, SE1 7PB, UK
www.cloudflare.com
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH net-next] net: initialize net->net_cookie at netns setup
2021-02-10 14:41 [PATCH net-next] net: initialize net->net_cookie at netns setup Eric Dumazet
2021-02-10 14:50 ` Daniel Borkmann
2021-02-11 11:31 ` Lorenz Bauer
@ 2021-02-11 22:20 ` patchwork-bot+netdevbpf
2 siblings, 0 replies; 4+ messages in thread
From: patchwork-bot+netdevbpf @ 2021-02-11 22:20 UTC (permalink / raw)
To: Eric Dumazet; +Cc: davem, kuba, netdev, edumazet, daniel, lmb
Hello:
This patch was applied to netdev/net-next.git (refs/heads/master):
On Wed, 10 Feb 2021 06:41:44 -0800 you wrote:
> From: Eric Dumazet <edumazet@google.com>
>
> It is simpler to make net->net_cookie a plain u64
> written once in setup_net() instead of looping
> and using atomic64 helpers.
>
> Lorenz Bauer wants to add SO_NETNS_COOKIE socket option
> and this patch would makes his patch series simpler.
>
> [...]
Here is the summary with links:
- [net-next] net: initialize net->net_cookie at netns setup
https://git.kernel.org/netdev/net-next/c/3d368ab87cf6
You are awesome, thank you!
--
Deet-doot-dot, I am a bot.
https://korg.docs.kernel.org/patchwork/pwbot.html
^ permalink raw reply [flat|nested] 4+ messages in thread
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2021-02-10 14:41 [PATCH net-next] net: initialize net->net_cookie at netns setup Eric Dumazet
2021-02-10 14:50 ` Daniel Borkmann
2021-02-11 11:31 ` Lorenz Bauer
2021-02-11 22:20 ` patchwork-bot+netdevbpf
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