| // 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; |
| |
| 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(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; |
| } |