From 3190b649b4d9391be7bde3edd8e924e451c5d2f6 Mon Sep 17 00:00:00 2001 From: Xin Long Date: Tue, 22 Jun 2021 14:04:49 -0400 Subject: 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 Acked-by: Marcelo Ricardo Leitner Signed-off-by: David S. Miller --- net/sctp/socket.c | 118 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 118 insertions(+) (limited to 'net/sctp') 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 @@ 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(¶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; -- cgit v1.2.3