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authorJakub Sitnicki <jakub@cloudflare.com>2020-05-31 11:28:37 +0300
committerAlexei Starovoitov <ast@kernel.org>2020-06-02 01:21:02 +0300
commitb27f7bb590ba835b32ef122389db158e44cfda1e (patch)
tree79716052834fb939fcb957d357f0b9213c9cb5fc /net
parenta3fd7ceee05431d2c51ed86c6cae015d236a51f0 (diff)
downloadlinux-b27f7bb590ba835b32ef122389db158e44cfda1e.tar.xz
flow_dissector: Move out netns_bpf prog callbacks
Move functions to manage BPF programs attached to netns that are not specific to flow dissector to a dedicated module named bpf/net_namespace.c. The set of functions will grow with the addition of bpf_link support for netns attached programs. This patch prepares ground by creating a place for it. This is a code move with no functional changes intended. Signed-off-by: Jakub Sitnicki <jakub@cloudflare.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Link: https://lore.kernel.org/bpf/20200531082846.2117903-4-jakub@cloudflare.com
Diffstat (limited to 'net')
-rw-r--r--net/core/flow_dissector.c125
1 files changed, 4 insertions, 121 deletions
diff --git a/net/core/flow_dissector.c b/net/core/flow_dissector.c
index 6c1b8e43d611..d02df0b6d0d9 100644
--- a/net/core/flow_dissector.c
+++ b/net/core/flow_dissector.c
@@ -33,9 +33,6 @@
#endif
#include <linux/bpf-netns.h>
-/* Protects updates to netns_bpf */
-DEFINE_MUTEX(netns_bpf_mutex);
-
static void dissector_set_key(struct flow_dissector *flow_dissector,
enum flow_dissector_key_id key_id)
{
@@ -72,52 +69,8 @@ void skb_flow_dissector_init(struct flow_dissector *flow_dissector,
}
EXPORT_SYMBOL(skb_flow_dissector_init);
-int netns_bpf_prog_query(const union bpf_attr *attr,
- union bpf_attr __user *uattr)
-{
- __u32 __user *prog_ids = u64_to_user_ptr(attr->query.prog_ids);
- u32 prog_id, prog_cnt = 0, flags = 0;
- enum netns_bpf_attach_type type;
- struct bpf_prog *attached;
- struct net *net;
-
- if (attr->query.query_flags)
- return -EINVAL;
-
- type = to_netns_bpf_attach_type(attr->query.attach_type);
- if (type < 0)
- return -EINVAL;
-
- net = get_net_ns_by_fd(attr->query.target_fd);
- if (IS_ERR(net))
- return PTR_ERR(net);
-
- rcu_read_lock();
- attached = rcu_dereference(net->bpf.progs[type]);
- if (attached) {
- prog_cnt = 1;
- prog_id = attached->aux->id;
- }
- rcu_read_unlock();
-
- put_net(net);
-
- if (copy_to_user(&uattr->query.attach_flags, &flags, sizeof(flags)))
- return -EFAULT;
- if (copy_to_user(&uattr->query.prog_cnt, &prog_cnt, sizeof(prog_cnt)))
- return -EFAULT;
-
- if (!attr->query.prog_cnt || !prog_ids || !prog_cnt)
- return 0;
-
- if (copy_to_user(prog_ids, &prog_id, sizeof(u32)))
- return -EFAULT;
-
- return 0;
-}
-
-static int flow_dissector_bpf_prog_attach(struct net *net,
- struct bpf_prog *prog)
+#ifdef CONFIG_BPF_SYSCALL
+int flow_dissector_bpf_prog_attach(struct net *net, struct bpf_prog *prog)
{
enum netns_bpf_attach_type type = NETNS_BPF_FLOW_DISSECTOR;
struct bpf_prog *attached;
@@ -155,76 +108,7 @@ static int flow_dissector_bpf_prog_attach(struct net *net,
bpf_prog_put(attached);
return 0;
}
-
-int netns_bpf_prog_attach(const union bpf_attr *attr, struct bpf_prog *prog)
-{
- enum netns_bpf_attach_type type;
- struct net *net;
- int ret;
-
- type = to_netns_bpf_attach_type(attr->attach_type);
- if (type < 0)
- return -EINVAL;
-
- net = current->nsproxy->net_ns;
- mutex_lock(&netns_bpf_mutex);
- switch (type) {
- case NETNS_BPF_FLOW_DISSECTOR:
- ret = flow_dissector_bpf_prog_attach(net, prog);
- break;
- default:
- ret = -EINVAL;
- break;
- }
- mutex_unlock(&netns_bpf_mutex);
-
- return ret;
-}
-
-/* Must be called with netns_bpf_mutex held. */
-static int __netns_bpf_prog_detach(struct net *net,
- enum netns_bpf_attach_type type)
-{
- struct bpf_prog *attached;
-
- attached = rcu_dereference_protected(net->bpf.progs[type],
- lockdep_is_held(&netns_bpf_mutex));
- if (!attached)
- return -ENOENT;
- RCU_INIT_POINTER(net->bpf.progs[type], NULL);
- bpf_prog_put(attached);
- return 0;
-}
-
-int netns_bpf_prog_detach(const union bpf_attr *attr)
-{
- enum netns_bpf_attach_type type;
- int ret;
-
- type = to_netns_bpf_attach_type(attr->attach_type);
- if (type < 0)
- return -EINVAL;
-
- mutex_lock(&netns_bpf_mutex);
- ret = __netns_bpf_prog_detach(current->nsproxy->net_ns, type);
- mutex_unlock(&netns_bpf_mutex);
-
- return ret;
-}
-
-static void __net_exit netns_bpf_pernet_pre_exit(struct net *net)
-{
- enum netns_bpf_attach_type type;
-
- mutex_lock(&netns_bpf_mutex);
- for (type = 0; type < MAX_NETNS_BPF_ATTACH_TYPE; type++)
- __netns_bpf_prog_detach(net, type);
- mutex_unlock(&netns_bpf_mutex);
-}
-
-static struct pernet_operations netns_bpf_pernet_ops __net_initdata = {
- .pre_exit = netns_bpf_pernet_pre_exit,
-};
+#endif /* CONFIG_BPF_SYSCALL */
/**
* __skb_flow_get_ports - extract the upper layer ports and return them
@@ -1902,7 +1786,6 @@ static int __init init_default_flow_dissectors(void)
skb_flow_dissector_init(&flow_keys_basic_dissector,
flow_keys_basic_dissector_keys,
ARRAY_SIZE(flow_keys_basic_dissector_keys));
-
- return register_pernet_subsys(&netns_bpf_pernet_ops);
+ return 0;
}
core_initcall(init_default_flow_dissectors);