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rxrpc: Provide kernel interface to set max lifespan on a call 

Provide an interface to set max lifespan on a call from inside of the
kernel without having to call kernel_sendmsg().

Signed-off-by: David Howells <dhowells@redhat.com>
This commit is contained in:
David Howells 2019-05-16 13:50:31 +01:00
parent 51eba99970
commit bbd172e316
3 changed files with 37 additions and 0 deletions
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10
Documentation/networking/rxrpc.txt
View File

@ -1056,6 +1056,16 @@ The kernel interface functions are as follows:
This value can be used to determine if the remote client has been
restarted as it shouldn't change otherwise.
(*) Set the maxmimum lifespan on a call.
void rxrpc_kernel_set_max_life(struct socket *sock,
struct rxrpc_call *call,
unsigned long hard_timeout)
This sets the maximum lifespan on a call to hard_timeout (which is in
jiffies). In the event of the timeout occurring, the call will be
aborted and -ETIME or -ETIMEDOUT will be returned.
=======================
CONFIGURABLE PARAMETERS

2
include/net/af_rxrpc.h
View File

@ -68,5 +68,7 @@ u32 rxrpc_kernel_get_epoch(struct socket *, struct rxrpc_call *);
bool rxrpc_kernel_get_reply_time(struct socket *, struct rxrpc_call *,
ktime_t *);
bool rxrpc_kernel_call_is_complete(struct rxrpc_call *);
void rxrpc_kernel_set_max_life(struct socket *, struct rxrpc_call *,
unsigned long);
#endif /* _NET_RXRPC_H */

25
net/rxrpc/af_rxrpc.c
View File

@ -443,6 +443,31 @@ void rxrpc_kernel_new_call_notification(
}
EXPORT_SYMBOL(rxrpc_kernel_new_call_notification);
/**
* rxrpc_kernel_set_max_life - Set maximum lifespan on a call
* @sock: The socket the call is on
* @call: The call to configure
* @hard_timeout: The maximum lifespan of the call in jiffies
*
* Set the maximum lifespan of a call. The call will end with ETIME or
* ETIMEDOUT if it takes longer than this.
*/
void rxrpc_kernel_set_max_life(struct socket *sock, struct rxrpc_call *call,
unsigned long hard_timeout)
{
unsigned long now;
mutex_lock(&call->user_mutex);
now = jiffies;
hard_timeout += now;
WRITE_ONCE(call->expect_term_by, hard_timeout);
rxrpc_reduce_call_timer(call, hard_timeout, now, rxrpc_timer_set_for_hard);
mutex_unlock(&call->user_mutex);
}
EXPORT_SYMBOL(rxrpc_kernel_set_max_life);
/*
* connect an RxRPC socket
* - this just targets it at a specific destination; no actual connection