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ksmbd: add max ip connections parameter

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commit d8b6dc9256762293048bf122fc11c4e612d0ef5d upstream.

This parameter set the maximum number of connections per ip address.
The default is 8.

Cc: stable@vger.kernel.org
Fixes: c0d41112f1a5 ("ksmbd: extend the connection limiting mechanism to support IPv6")
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Namjae Jeon 2025-10-01 09:25:35 +09:00 committed by Greg Kroah-Hartman
parent b613671dc1
commit 8173dcfafe
4 changed files with 23 additions and 13 deletions
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5
fs/smb/server/ksmbd_netlink.h
View File

@ -112,10 +112,11 @@ struct ksmbd_startup_request {
__u32 smbd_max_io_size; /* smbd read write size */
__u32 max_connections; /* Number of maximum simultaneous connections */
__s8 bind_interfaces_only;
__s8 reserved[503]; /* Reserved room */
__u32 max_ip_connections; /* Number of maximum connection per ip address */
__s8 reserved[499]; /* Reserved room */
__u32 ifc_list_sz; /* interfaces list size */
__s8 ____payload[];
};
} __packed;
#define KSMBD_STARTUP_CONFIG_INTERFACES(s) ((s)->____payload)

1
fs/smb/server/server.h
View File

@ -43,6 +43,7 @@ struct ksmbd_server_config {
unsigned int auth_mechs;
unsigned int max_connections;
unsigned int max_inflight_req;
unsigned int max_ip_connections;
char *conf[SERVER_CONF_WORK_GROUP + 1];
struct task_struct *dh_task;

3
fs/smb/server/transport_ipc.c
View File

@ -335,6 +335,9 @@ static int ipc_server_config_on_startup(struct ksmbd_startup_request *req)
if (req->max_connections)
server_conf.max_connections = req->max_connections;
if (req->max_ip_connections)
server_conf.max_ip_connections = req->max_ip_connections;
ret = ksmbd_set_netbios_name(req->netbios_name);
ret |= ksmbd_set_server_string(req->server_string);
ret |= ksmbd_set_work_group(req->work_group);

27
fs/smb/server/transport_tcp.c
View File

@ -240,6 +240,7 @@ static int ksmbd_kthread_fn(void *p)
struct interface *iface = (struct interface *)p;
struct ksmbd_conn *conn;
int ret;
unsigned int max_ip_conns;
while (!kthread_should_stop()) {
mutex_lock(&iface->sock_release_lock);
@ -257,34 +258,38 @@ static int ksmbd_kthread_fn(void *p)
continue;
}
if (!server_conf.max_ip_connections)
goto skip_max_ip_conns_limit;
/*
* Limits repeated connections from clients with the same IP.
*/
max_ip_conns = 0;
down_read(&conn_list_lock);
list_for_each_entry(conn, &conn_list, conns_list)
list_for_each_entry(conn, &conn_list, conns_list) {
#if IS_ENABLED(CONFIG_IPV6)
if (client_sk->sk->sk_family == AF_INET6) {
if (memcmp(&client_sk->sk->sk_v6_daddr,
&conn->inet6_addr, 16) == 0) {
ret = -EAGAIN;
break;
}
&conn->inet6_addr, 16) == 0)
max_ip_conns++;
} else if (inet_sk(client_sk->sk)->inet_daddr ==
conn->inet_addr) {
ret = -EAGAIN;
break;
}
conn->inet_addr)
max_ip_conns++;
#else
if (inet_sk(client_sk->sk)->inet_daddr ==
conn->inet_addr) {
conn->inet_addr)
max_ip_conns++;
#endif
if (server_conf.max_ip_connections <= max_ip_conns) {
ret = -EAGAIN;
break;
}
#endif
}
up_read(&conn_list_lock);
if (ret == -EAGAIN)
continue;
skip_max_ip_conns_limit:
if (server_conf.max_connections &&
atomic_inc_return(&active_num_conn) >= server_conf.max_connections) {
pr_info_ratelimited("Limit the maximum number of connections(%u)\n",