netdev - [PATCH bpf-next v3 1/2] bpf: Allow bpf_get_netns_cookie in BPF_PROG_TYPE_CGROUP

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20210813230530.333779-2-sdf@google.com>
Date:   Fri, 13 Aug 2021 16:05:29 -0700
From:   Stanislav Fomichev <sdf@...gle.com>
To:     netdev@...r.kernel.org, bpf@...r.kernel.org
Cc:     ast@...nel.org, daniel@...earbox.net, andrii@...nel.org,
        Stanislav Fomichev <sdf@...gle.com>,
        Martin KaFai Lau <kafai@...com>
Subject: [PATCH bpf-next v3 1/2] bpf: Allow bpf_get_netns_cookie in BPF_PROG_TYPE_CGROUP_SOCKOPT

This is similar to existing BPF_PROG_TYPE_CGROUP_SOCK
and BPF_PROG_TYPE_CGROUP_SOCK_ADDR.

Cc: Martin KaFai Lau <kafai@...com>
Signed-off-by: Stanislav Fomichev <sdf@...gle.com>
---
 kernel/bpf/cgroup.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/kernel/bpf/cgroup.c b/kernel/bpf/cgroup.c
index b567ca46555c..9f6070369caa 100644
--- a/kernel/bpf/cgroup.c
+++ b/kernel/bpf/cgroup.c
@@ -1846,11 +1846,29 @@ const struct bpf_verifier_ops cg_sysctl_verifier_ops = {
 const struct bpf_prog_ops cg_sysctl_prog_ops = {
 };
 
+#ifdef CONFIG_NET
+BPF_CALL_1(bpf_get_netns_cookie_sockopt, struct bpf_sockopt_kern *, ctx)
+{
+	const struct net *net = ctx ? sock_net(ctx->sk) : &init_net;
+
+	return net->net_cookie;
+}
+
+static const struct bpf_func_proto bpf_get_netns_cookie_sockopt_proto = {
+	.func		= bpf_get_netns_cookie_sockopt,
+	.gpl_only	= false,
+	.ret_type	= RET_INTEGER,
+	.arg1_type	= ARG_PTR_TO_CTX_OR_NULL,
+};
+#endif
+
 static const struct bpf_func_proto *
 cg_sockopt_func_proto(enum bpf_func_id func_id, const struct bpf_prog *prog)
 {
 	switch (func_id) {
 #ifdef CONFIG_NET
+	case BPF_FUNC_get_netns_cookie:
+		return &bpf_get_netns_cookie_sockopt_proto;
 	case BPF_FUNC_sk_storage_get:
 		return &bpf_sk_storage_get_proto;
 	case BPF_FUNC_sk_storage_delete:
-- 
2.33.0.rc1.237.g0d66db33f3-goog