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Message-Id: <f7ad5ee7af232bae59786ca7522f4e238af0ec93.1624239422.git.lucien.xin@gmail.com>
Date: Sun, 20 Jun 2021 21:38:38 -0400
From: Xin Long <lucien.xin@...il.com>
To: network dev <netdev@...r.kernel.org>, davem@...emloft.net,
kuba@...nel.org,
Marcelo Ricardo Leitner <marcelo.leitner@...il.com>,
linux-sctp@...r.kernel.org
Subject: [PATCH net-next 03/14] sctp: add SCTP_PLPMTUD_PROBE_INTERVAL sockopt for sock/asoc/transport
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@...il.com>
---
include/uapi/linux/sctp.h | 8 +++
net/sctp/socket.c | 118 ++++++++++++++++++++++++++++++++++++++
2 files changed, 126 insertions(+)
diff --git a/include/uapi/linux/sctp.h b/include/uapi/linux/sctp.h
index cb78e7a739da..c4ff1ebd8bcc 100644
--- a/include/uapi/linux/sctp.h
+++ b/include/uapi/linux/sctp.h
@@ -141,6 +141,7 @@ typedef __s32 sctp_assoc_t;
#define SCTP_EXPOSE_POTENTIALLY_FAILED_STATE 131
#define SCTP_EXPOSE_PF_STATE SCTP_EXPOSE_POTENTIALLY_FAILED_STATE
#define SCTP_REMOTE_UDP_ENCAPS_PORT 132
+#define SCTP_PLPMTUD_PROBE_INTERVAL 133
/* PR-SCTP policies */
#define SCTP_PR_SCTP_NONE 0x0000
@@ -1213,4 +1214,11 @@ enum sctp_sched_type {
SCTP_SS_MAX = SCTP_SS_RR
};
+/* Probe Interval socket option */
+struct sctp_probeinterval {
+ sctp_assoc_t spi_assoc_id;
+ struct sockaddr_storage spi_address;
+ __u32 spi_interval;
+};
+
#endif /* _UAPI_SCTP_H */
diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index d2960ab665a5..aba576f53458 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -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 *)¶ms->spi_address)) {
+ t = sctp_addr_id2transport(sk, ¶ms->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 @@ static int sctp_getsockopt_encap_port(struct sock *sk, int len,
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(¶ms, 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 *)¶ms.spi_address)) {
+ t = sctp_addr_id2transport(sk, ¶ms.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, ¶ms, 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;
--
2.27.0
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