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sctp: add SCTP_PLPMTUD_PROBE_INTERVAL sockopt for sock/asoc/transport

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With this socket option, users can change probe_interval for
a transport, asoc or sock after it's created.

Note that if the change is for an asoc, also apply the change
to each transport in this asoc.

Signed-off-by: Xin Long <lucien.xin@gmail.com>
Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Xin Long
2021-06-22 14:04:49 -04:00
committed by David S. Miller
parent d1e462a7a5
commit 3190b649b4
2 changed files with 126 additions and 0 deletions
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118
net/sctp/socket.c
View File

@@ -4481,6 +4481,58 @@ static int sctp_setsockopt_encap_port(struct sock *sk,
return 0;
}
static int sctp_setsockopt_probe_interval(struct sock *sk,
struct sctp_probeinterval *params,
unsigned int optlen)
{
struct sctp_association *asoc;
struct sctp_transport *t;
__u32 probe_interval;
if (optlen != sizeof(*params))
return -EINVAL;
probe_interval = params->spi_interval;
if (probe_interval && probe_interval < SCTP_PROBE_TIMER_MIN)
return -EINVAL;
/* If an address other than INADDR_ANY is specified, and
* no transport is found, then the request is invalid.
*/
if (!sctp_is_any(sk, (union sctp_addr *)&params->spi_address)) {
t = sctp_addr_id2transport(sk, &params->spi_address,
params->spi_assoc_id);
if (!t)
return -EINVAL;
t->probe_interval = msecs_to_jiffies(probe_interval);
return 0;
}
/* Get association, if assoc_id != SCTP_FUTURE_ASSOC and the
* socket is a one to many style socket, and an association
* was not found, then the id was invalid.
*/
asoc = sctp_id2assoc(sk, params->spi_assoc_id);
if (!asoc && params->spi_assoc_id != SCTP_FUTURE_ASSOC &&
sctp_style(sk, UDP))
return -EINVAL;
/* If changes are for association, also apply probe_interval to
* each transport.
*/
if (asoc) {
list_for_each_entry(t, &asoc->peer.transport_addr_list, transports)
t->probe_interval = msecs_to_jiffies(probe_interval);
asoc->probe_interval = msecs_to_jiffies(probe_interval);
return 0;
}
sctp_sk(sk)->probe_interval = probe_interval;
return 0;
}
/* API 6.2 setsockopt(), getsockopt()
*
* Applications use setsockopt() and getsockopt() to set or retrieve
@@ -4703,6 +4755,9 @@ static int sctp_setsockopt(struct sock *sk, int level, int optname,
case SCTP_REMOTE_UDP_ENCAPS_PORT:
retval = sctp_setsockopt_encap_port(sk, kopt, optlen);
break;
case SCTP_PLPMTUD_PROBE_INTERVAL:
retval = sctp_setsockopt_probe_interval(sk, kopt, optlen);
break;
default:
retval = -ENOPROTOOPT;
break;
@@ -7906,6 +7961,66 @@ out:
return 0;
}
static int sctp_getsockopt_probe_interval(struct sock *sk, int len,
char __user *optval,
int __user *optlen)
{
struct sctp_probeinterval params;
struct sctp_association *asoc;
struct sctp_transport *t;
__u32 probe_interval;
if (len < sizeof(params))
return -EINVAL;
len = sizeof(params);
if (copy_from_user(&params, optval, len))
return -EFAULT;
/* If an address other than INADDR_ANY is specified, and
* no transport is found, then the request is invalid.
*/
if (!sctp_is_any(sk, (union sctp_addr *)&params.spi_address)) {
t = sctp_addr_id2transport(sk, &params.spi_address,
params.spi_assoc_id);
if (!t) {
pr_debug("%s: failed no transport\n", __func__);
return -EINVAL;
}
probe_interval = jiffies_to_msecs(t->probe_interval);
goto out;
}
/* Get association, if assoc_id != SCTP_FUTURE_ASSOC and the
* socket is a one to many style socket, and an association
* was not found, then the id was invalid.
*/
asoc = sctp_id2assoc(sk, params.spi_assoc_id);
if (!asoc && params.spi_assoc_id != SCTP_FUTURE_ASSOC &&
sctp_style(sk, UDP)) {
pr_debug("%s: failed no association\n", __func__);
return -EINVAL;
}
if (asoc) {
probe_interval = jiffies_to_msecs(asoc->probe_interval);
goto out;
}
probe_interval = sctp_sk(sk)->probe_interval;
out:
params.spi_interval = probe_interval;
if (copy_to_user(optval, &params, len))
return -EFAULT;
if (put_user(len, optlen))
return -EFAULT;
return 0;
}
static int sctp_getsockopt(struct sock *sk, int level, int optname,
char __user *optval, int __user *optlen)
{
@@ -8129,6 +8244,9 @@ static int sctp_getsockopt(struct sock *sk, int level, int optname,
case SCTP_REMOTE_UDP_ENCAPS_PORT:
retval = sctp_getsockopt_encap_port(sk, len, optval, optlen);
break;
case SCTP_PLPMTUD_PROBE_INTERVAL:
retval = sctp_getsockopt_probe_interval(sk, len, optval, optlen);
break;
default:
retval = -ENOPROTOOPT;
break;