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authorDavide Caratti <dcaratti@redhat.com>2020-03-28 00:48:49 +0300
committerDavid S. Miller <davem@davemloft.net>2020-03-30 08:14:48 +0300
commit5147dfb5083204d6f5468d6d6d2d04b2cdc0cf2b (patch)
tree69230ab7f4b1f6df999b78c6b82a5aa353bcbfc4 /net/mptcp/diag.c
parent3b1d6210a9577369103330b0d802b0bf74b65e7f (diff)
downloadlinux-5147dfb5083204d6f5468d6d6d2d04b2cdc0cf2b.tar.xz
mptcp: allow dumping subflow context to userspace
add ulp-specific diagnostic functions, so that subflow information can be dumped to userspace programs like 'ss'. v2 -> v3: - uapi: use bit macros appropriate for userspace Co-developed-by: Matthieu Baerts <matthieu.baerts@tessares.net> Signed-off-by: Matthieu Baerts <matthieu.baerts@tessares.net> Co-developed-by: Paolo Abeni <pabeni@redhat.com> Signed-off-by: Paolo Abeni <pabeni@redhat.com> Signed-off-by: Davide Caratti <dcaratti@redhat.com> Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/mptcp/diag.c')
-rw-r--r--net/mptcp/diag.c104
1 files changed, 104 insertions, 0 deletions
diff --git a/net/mptcp/diag.c b/net/mptcp/diag.c
new file mode 100644
index 000000000000..a536586742f2
--- /dev/null
+++ b/net/mptcp/diag.c
@@ -0,0 +1,104 @@
+// SPDX-License-Identifier: GPL-2.0
+/* MPTCP socket monitoring support
+ *
+ * Copyright (c) 2019 Red Hat
+ *
+ * Author: Davide Caratti <dcaratti@redhat.com>
+ */
+
+#include <linux/kernel.h>
+#include <linux/net.h>
+#include <linux/inet_diag.h>
+#include <net/netlink.h>
+#include <uapi/linux/mptcp.h>
+#include "protocol.h"
+
+static int subflow_get_info(const struct sock *sk, struct sk_buff *skb)
+{
+ struct mptcp_subflow_context *sf;
+ struct nlattr *start;
+ u32 flags = 0;
+ int err;
+
+ start = nla_nest_start_noflag(skb, INET_ULP_INFO_MPTCP);
+ if (!start)
+ return -EMSGSIZE;
+
+ rcu_read_lock();
+ sf = rcu_dereference(inet_csk(sk)->icsk_ulp_data);
+ if (!sf) {
+ err = 0;
+ goto nla_failure;
+ }
+
+ if (sf->mp_capable)
+ flags |= MPTCP_SUBFLOW_FLAG_MCAP_REM;
+ if (sf->request_mptcp)
+ flags |= MPTCP_SUBFLOW_FLAG_MCAP_LOC;
+ if (sf->mp_join)
+ flags |= MPTCP_SUBFLOW_FLAG_JOIN_REM;
+ if (sf->request_join)
+ flags |= MPTCP_SUBFLOW_FLAG_JOIN_LOC;
+ if (sf->backup)
+ flags |= MPTCP_SUBFLOW_FLAG_BKUP_REM;
+ if (sf->request_bkup)
+ flags |= MPTCP_SUBFLOW_FLAG_BKUP_LOC;
+ if (sf->fully_established)
+ flags |= MPTCP_SUBFLOW_FLAG_FULLY_ESTABLISHED;
+ if (sf->conn_finished)
+ flags |= MPTCP_SUBFLOW_FLAG_CONNECTED;
+ if (sf->map_valid)
+ flags |= MPTCP_SUBFLOW_FLAG_MAPVALID;
+
+ if (nla_put_u32(skb, MPTCP_SUBFLOW_ATTR_TOKEN_REM, sf->remote_token) ||
+ nla_put_u32(skb, MPTCP_SUBFLOW_ATTR_TOKEN_LOC, sf->token) ||
+ nla_put_u32(skb, MPTCP_SUBFLOW_ATTR_RELWRITE_SEQ,
+ sf->rel_write_seq) ||
+ nla_put_u64_64bit(skb, MPTCP_SUBFLOW_ATTR_MAP_SEQ, sf->map_seq,
+ MPTCP_SUBFLOW_ATTR_PAD) ||
+ nla_put_u32(skb, MPTCP_SUBFLOW_ATTR_MAP_SFSEQ,
+ sf->map_subflow_seq) ||
+ nla_put_u32(skb, MPTCP_SUBFLOW_ATTR_SSN_OFFSET, sf->ssn_offset) ||
+ nla_put_u16(skb, MPTCP_SUBFLOW_ATTR_MAP_DATALEN,
+ sf->map_data_len) ||
+ nla_put_u32(skb, MPTCP_SUBFLOW_ATTR_FLAGS, flags) ||
+ nla_put_u8(skb, MPTCP_SUBFLOW_ATTR_ID_REM, sf->remote_id) ||
+ nla_put_u8(skb, MPTCP_SUBFLOW_ATTR_ID_LOC, sf->local_id)) {
+ err = -EMSGSIZE;
+ goto nla_failure;
+ }
+
+ rcu_read_unlock();
+ nla_nest_end(skb, start);
+ return 0;
+
+nla_failure:
+ rcu_read_unlock();
+ nla_nest_cancel(skb, start);
+ return err;
+}
+
+static size_t subflow_get_info_size(const struct sock *sk)
+{
+ size_t size = 0;
+
+ size += nla_total_size(0) + /* INET_ULP_INFO_MPTCP */
+ nla_total_size(4) + /* MPTCP_SUBFLOW_ATTR_TOKEN_REM */
+ nla_total_size(4) + /* MPTCP_SUBFLOW_ATTR_TOKEN_LOC */
+ nla_total_size(4) + /* MPTCP_SUBFLOW_ATTR_RELWRITE_SEQ */
+ nla_total_size_64bit(8) + /* MPTCP_SUBFLOW_ATTR_MAP_SEQ */
+ nla_total_size(4) + /* MPTCP_SUBFLOW_ATTR_MAP_SFSEQ */
+ nla_total_size(2) + /* MPTCP_SUBFLOW_ATTR_SSN_OFFSET */
+ nla_total_size(2) + /* MPTCP_SUBFLOW_ATTR_MAP_DATALEN */
+ nla_total_size(4) + /* MPTCP_SUBFLOW_ATTR_FLAGS */
+ nla_total_size(1) + /* MPTCP_SUBFLOW_ATTR_ID_REM */
+ nla_total_size(1) + /* MPTCP_SUBFLOW_ATTR_ID_LOC */
+ 0;
+ return size;
+}
+
+void mptcp_diag_subflow_init(struct tcp_ulp_ops *ops)
+{
+ ops->get_info = subflow_get_info;
+ ops->get_info_size = subflow_get_info_size;
+}