From: Jakub Sitnicki <jakub@cloudflare.com>
To: bpf@vger.kernel.org
Cc: netdev@vger.kernel.org, kernel-team@cloudflare.com
Subject: [PATCH bpf-next 2/8] flow_dissector: Pull locking up from prog attach callback
Date: Wed, 27 May 2020 19:08:34 +0200 [thread overview]
Message-ID: <20200527170840.1768178-3-jakub@cloudflare.com> (raw)
In-Reply-To: <20200527170840.1768178-1-jakub@cloudflare.com>
Split out the part of attach callback that happens with attach/detach lock
acquired. This structures the prog attach callback similar to prog detach,
and opens up doors for moving the locking out of flow_dissector and into
generic callbacks for attaching/detaching progs to netns in subsequent
patches.
Signed-off-by: Jakub Sitnicki <jakub@cloudflare.com>
---
net/core/flow_dissector.c | 40 +++++++++++++++++++--------------------
1 file changed, 20 insertions(+), 20 deletions(-)
diff --git a/net/core/flow_dissector.c b/net/core/flow_dissector.c
index 73cc085dc2b7..4f73f6c51602 100644
--- a/net/core/flow_dissector.c
+++ b/net/core/flow_dissector.c
@@ -109,15 +109,10 @@ int skb_flow_dissector_prog_query(const union bpf_attr *attr,
return 0;
}
-int skb_flow_dissector_bpf_prog_attach(const union bpf_attr *attr,
- struct bpf_prog *prog)
+static int flow_dissector_bpf_prog_attach(struct net *net,
+ struct bpf_prog *prog)
{
struct bpf_prog *attached;
- struct net *net;
- int ret = 0;
-
- net = current->nsproxy->net_ns;
- mutex_lock(&flow_dissector_mutex);
if (net == &init_net) {
/* BPF flow dissector in the root namespace overrides
@@ -130,33 +125,38 @@ int skb_flow_dissector_bpf_prog_attach(const union bpf_attr *attr,
for_each_net(ns) {
if (ns == &init_net)
continue;
- if (rcu_access_pointer(ns->flow_dissector_prog)) {
- ret = -EEXIST;
- goto out;
- }
+ if (rcu_access_pointer(ns->flow_dissector_prog))
+ return -EEXIST;
}
} else {
/* Make sure root flow dissector is not attached
* when attaching to the non-root namespace.
*/
- if (rcu_access_pointer(init_net.flow_dissector_prog)) {
- ret = -EEXIST;
- goto out;
- }
+ if (rcu_access_pointer(init_net.flow_dissector_prog))
+ return -EEXIST;
}
attached = rcu_dereference_protected(net->flow_dissector_prog,
lockdep_is_held(&flow_dissector_mutex));
- if (attached == prog) {
+ if (attached == prog)
/* The same program cannot be attached twice */
- ret = -EINVAL;
- goto out;
- }
+ return -EINVAL;
+
rcu_assign_pointer(net->flow_dissector_prog, prog);
if (attached)
bpf_prog_put(attached);
-out:
+ return 0;
+}
+
+int skb_flow_dissector_bpf_prog_attach(const union bpf_attr *attr,
+ struct bpf_prog *prog)
+{
+ int ret;
+
+ mutex_lock(&flow_dissector_mutex);
+ ret = flow_dissector_bpf_prog_attach(current->nsproxy->net_ns, prog);
mutex_unlock(&flow_dissector_mutex);
+
return ret;
}
--
2.25.4
next prev parent reply other threads:[~2020-05-27 17:08 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-27 17:08 [PATCH bpf-next 0/8] Link-based program attachment to network namespaces Jakub Sitnicki
2020-05-27 17:08 ` [PATCH bpf-next 1/8] flow_dissector: Don't grab update-side lock on prog detach from pre_exit Jakub Sitnicki
2020-05-27 17:35 ` sdf
2020-05-27 17:08 ` Jakub Sitnicki [this message]
2020-05-27 17:35 ` [PATCH bpf-next 2/8] flow_dissector: Pull locking up from prog attach callback sdf
2020-05-27 17:08 ` [PATCH bpf-next 3/8] net: Introduce netns_bpf for BPF programs attached to netns Jakub Sitnicki
2020-05-27 17:40 ` sdf
2020-05-27 19:31 ` Jakub Sitnicki
2020-05-27 20:36 ` sdf
2020-05-27 17:08 ` [PATCH bpf-next 4/8] flow_dissector: Move out netns_bpf prog callbacks Jakub Sitnicki
2020-05-27 17:08 ` [PATCH bpf-next 5/8] bpf: Add link-based BPF program attachment to network namespace Jakub Sitnicki
2020-05-27 17:48 ` sdf
2020-05-27 19:54 ` Jakub Sitnicki
2020-05-27 20:38 ` sdf
2020-05-28 10:34 ` Jakub Sitnicki
2020-05-27 20:53 ` sdf
2020-05-28 11:03 ` Jakub Sitnicki
2020-05-28 16:09 ` sdf
2020-05-28 2:54 ` kbuild test robot
2020-06-04 23:38 ` Nick Desaulniers
2020-06-05 14:41 ` Jakub Sitnicki
2020-05-28 5:56 ` Andrii Nakryiko
2020-05-28 12:26 ` Jakub Sitnicki
2020-05-28 18:09 ` Andrii Nakryiko
2020-05-28 18:48 ` Alexei Starovoitov
2020-05-28 13:30 ` Jakub Sitnicki
2020-05-27 17:08 ` [PATCH bpf-next 6/8] libbpf: Add support for bpf_link-based netns attachment Jakub Sitnicki
2020-05-28 5:59 ` Andrii Nakryiko
2020-05-28 13:05 ` Jakub Sitnicki
2020-05-27 17:08 ` [PATCH bpf-next 7/8] bpftool: Support link show for netns-attached links Jakub Sitnicki
2020-05-28 6:02 ` Andrii Nakryiko
2020-05-28 13:10 ` Jakub Sitnicki
2020-05-27 17:08 ` [PATCH bpf-next 8/8] selftests/bpf: Add tests for attaching bpf_link to netns Jakub Sitnicki
2020-05-28 6:08 ` Andrii Nakryiko
2020-05-28 13:29 ` Jakub Sitnicki
2020-05-28 18:31 ` Andrii Nakryiko
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20200527170840.1768178-3-jakub@cloudflare.com \
--to=jakub@cloudflare.com \
--cc=bpf@vger.kernel.org \
--cc=kernel-team@cloudflare.com \
--cc=netdev@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).