mirror of
https://github.com/torvalds/linux.git
synced 2024-11-22 04:02:20 +00:00
655111b838
ssn_offset field is u32 and is placed into the netlink response with
nla_put_u32(), but only 2 bytes are reserved for the attribute payload
in subflow_get_info_size() (even though it makes no difference
in the end, as it is aligned up to 4 bytes). Supply the correct
argument to the relevant nla_total_size() call to make it less
confusing.
Fixes: 5147dfb508 ("mptcp: allow dumping subflow context to userspace")
Signed-off-by: Eugene Syromiatnikov <esyr@redhat.com>
Reviewed-by: Matthieu Baerts (NGI0) <matttbe@kernel.org>
Link: https://patch.msgid.link/20240812065024.GA19719@asgard.redhat.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
111 lines
3.1 KiB
C
111 lines
3.1 KiB
C
// 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 "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, subflow_get_local_id(sf))) {
|
|
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(4) + /* 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;
|
|
}
|