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tcp, ulp: remove ulp bits from sockmap

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In order to prepare sockmap logic to be used in combination with kTLS
we need to detangle it from ULP, and further split it in later commits
into a generic API.

Joint work with John.

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Daniel Borkmann 2018-10-13 02:45:57 +02:00 • committed by Alexei Starovoitov
parent 8b9088f806
commit 1243a51f6c
3 changed files with 32 additions and 97 deletions
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89
net/ipv4/tcp_ulp.c
View file

@ -6,7 +6,7 @@
*
*/
#include<linux/module.h>
#include <linux/module.h>
#include <linux/mm.h>
#include <linux/types.h>
#include <linux/list.h>
@ -29,18 +29,6 @@ static struct tcp_ulp_ops *tcp_ulp_find(const char *name)
return NULL;
}
static struct tcp_ulp_ops *tcp_ulp_find_id(const int ulp)
{
struct tcp_ulp_ops *e;
list_for_each_entry_rcu(e, &tcp_ulp_list, list) {
if (e->uid == ulp)
return e;
}
return NULL;
}
static const struct tcp_ulp_ops *__tcp_ulp_find_autoload(const char *name)
{
const struct tcp_ulp_ops *ulp = NULL;
@ -63,18 +51,6 @@ static const struct tcp_ulp_ops *__tcp_ulp_find_autoload(const char *name)
return ulp;
}
static const struct tcp_ulp_ops *__tcp_ulp_lookup(const int uid)
{
const struct tcp_ulp_ops *ulp;
rcu_read_lock();
ulp = tcp_ulp_find_id(uid);
if (!ulp || !try_module_get(ulp->owner))
ulp = NULL;
rcu_read_unlock();
return ulp;
}
/* Attach new upper layer protocol to the list
* of available protocols.
*/
@ -135,56 +111,35 @@ void tcp_cleanup_ulp(struct sock *sk)
icsk->icsk_ulp_ops = NULL;
}
/* Change upper layer protocol for socket */
int tcp_set_ulp(struct sock *sk, const char *name)
static int __tcp_set_ulp(struct sock *sk, const struct tcp_ulp_ops *ulp_ops)
{
struct inet_connection_sock *icsk = inet_csk(sk);
int err;
err = -EEXIST;
if (icsk->icsk_ulp_ops)
goto out_err;
err = ulp_ops->init(sk);
if (err)
goto out_err;
icsk->icsk_ulp_ops = ulp_ops;
return 0;
out_err:
module_put(ulp_ops->owner);
return err;
}
int tcp_set_ulp(struct sock *sk, const char *name)
{
const struct tcp_ulp_ops *ulp_ops;
int err = 0;
sock_owned_by_me(sk);
if (icsk->icsk_ulp_ops)
return -EEXIST;
ulp_ops = __tcp_ulp_find_autoload(name);
if (!ulp_ops)
return -ENOENT;
if (!ulp_ops->user_visible) {
module_put(ulp_ops->owner);
return -ENOENT;
}
err = ulp_ops->init(sk);
if (err) {
module_put(ulp_ops->owner);
return err;
}
icsk->icsk_ulp_ops = ulp_ops;
return 0;
}
int tcp_set_ulp_id(struct sock *sk, int ulp)
{
struct inet_connection_sock *icsk = inet_csk(sk);
const struct tcp_ulp_ops *ulp_ops;
int err;
sock_owned_by_me(sk);
if (icsk->icsk_ulp_ops)
return -EEXIST;
ulp_ops = __tcp_ulp_lookup(ulp);
if (!ulp_ops)
return -ENOENT;
err = ulp_ops->init(sk);
if (err) {
module_put(ulp_ops->owner);
return err;
}
icsk->icsk_ulp_ops = ulp_ops;
return 0;
return __tcp_set_ulp(sk, ulp_ops);
}