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// 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(struct sock *sk, struct sk_buff *skb)
{
struct mptcp_subflow_context *sf;
struct nlattr *start;
u32 flags = 0;
bool slow;
int err;
if (inet_sk_state_load(sk) == TCP_LISTEN)
return 0;
start = nla_nest_start_noflag(skb, INET_ULP_INFO_MPTCP);
if (!start)
return -EMSGSIZE;
slow = lock_sock_fast(sk);
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();
unlock_sock_fast(sk, slow);
nla_nest_end(skb, start);
return 0;
nla_failure:
rcu_read_unlock();
unlock_sock_fast(sk, slow);
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;
}
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