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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.

Signed-off-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Link: https://lore.kernel.org/bpf/20210813230530.333779-2-sdf@google.com
This commit is contained in:
Stanislav Fomichev 2021-08-13 16:05:29 -07:00 committed by Andrii Nakryiko
parent d164dd9a5c
commit f1248dee95
1 changed files with 18 additions and 0 deletions
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18
kernel/bpf/cgroup.c
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@ -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: