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rxrpc: add rxrpc_sock_set_min_security_level 

Add a helper to directly set the RXRPC_MIN_SECURITY_LEVEL sockopt from
kernel space without going through a fake uaccess.

Thanks to David Howells for the documentation updates.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: David Howells <dhowells@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Christoph Hellwig 2020-05-28 07:12:35 +02:00 committed by David S. Miller
parent 7d7207c2d5
commit 298cd88a66
4 changed files with 28 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
Documentation/networking/rxrpc.rst
View File

@ -477,7 +477,7 @@ AF_RXRPC sockets support a few socket options at the SOL_RXRPC level:
Encrypted checksum plus packet padded and first eight bytes of packet
encrypted - which includes the actual packet length.
(c) RXRPC_SECURITY_ENCRYPTED
(c) RXRPC_SECURITY_ENCRYPT
Encrypted checksum plus entire packet padded and encrypted, including
actual packet length.
@ -578,7 +578,7 @@ A client would issue an operation by:
This issues a request_key() to get the key representing the security
context. The minimum security level can be set::
unsigned int sec = RXRPC_SECURITY_ENCRYPTED;
unsigned int sec = RXRPC_SECURITY_ENCRYPT;
setsockopt(client, SOL_RXRPC, RXRPC_MIN_SECURITY_LEVEL,
&sec, sizeof(sec));
@ -1090,6 +1090,15 @@ The kernel interface functions are as follows:
jiffies). In the event of the timeout occurring, the call will be
aborted and -ETIME or -ETIMEDOUT will be returned.
(#) Apply the RXRPC_MIN_SECURITY_LEVEL sockopt to a socket from within in the
kernel::
int rxrpc_sock_set_min_security_level(struct sock *sk,
unsigned int val);
This specifies the minimum security level required for calls on this
socket.
Configurable Parameters
=======================

6
fs/afs/rxrpc.c
View File

@ -37,7 +37,6 @@ int afs_open_socket(struct afs_net *net)
{
struct sockaddr_rxrpc srx;
struct socket *socket;
unsigned int min_level;
int ret;
_enter("");
@ -57,9 +56,8 @@ int afs_open_socket(struct afs_net *net)
srx.transport.sin6.sin6_family = AF_INET6;
srx.transport.sin6.sin6_port = htons(AFS_CM_PORT);
min_level = RXRPC_SECURITY_ENCRYPT;
ret = kernel_setsockopt(socket, SOL_RXRPC, RXRPC_MIN_SECURITY_LEVEL,
(void *)&min_level, sizeof(min_level));
ret = rxrpc_sock_set_min_security_level(socket->sk,
RXRPC_SECURITY_ENCRYPT);
if (ret < 0)
goto error_2;

2
include/net/af_rxrpc.h
View File

@ -72,4 +72,6 @@ bool rxrpc_kernel_call_is_complete(struct rxrpc_call *);
void rxrpc_kernel_set_max_life(struct socket *, struct rxrpc_call *,
unsigned long);
int rxrpc_sock_set_min_security_level(struct sock *sk, unsigned int val);
#endif /* _NET_RXRPC_H */

13
net/rxrpc/af_rxrpc.c
View File

@ -571,6 +571,19 @@ static int rxrpc_sendmsg(struct socket *sock, struct msghdr *m, size_t len)
return ret;
}
int rxrpc_sock_set_min_security_level(struct sock *sk, unsigned int val)
{
if (sk->sk_state != RXRPC_UNBOUND)
return -EISCONN;
if (val > RXRPC_SECURITY_MAX)
return -EINVAL;
lock_sock(sk);
rxrpc_sk(sk)->min_sec_level = val;
release_sock(sk);
return 0;
}
EXPORT_SYMBOL(rxrpc_sock_set_min_security_level);
/*
* set RxRPC socket options
*/