1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* MPTCP socket monitoring support |
3 | * |
4 | * Copyright (c) 2019 Red Hat |
5 | * |
6 | * Author: Davide Caratti <dcaratti@redhat.com> |
7 | */ |
8 | |
9 | #include <linux/kernel.h> |
10 | #include <linux/net.h> |
11 | #include <linux/inet_diag.h> |
12 | #include <net/netlink.h> |
13 | #include <uapi/linux/mptcp.h> |
14 | #include "protocol.h" |
15 | |
16 | static int subflow_get_info(const struct sock *sk, struct sk_buff *skb) |
17 | { |
18 | struct mptcp_subflow_context *sf; |
19 | struct nlattr *start; |
20 | u32 flags = 0; |
21 | int err; |
22 | |
23 | start = nla_nest_start_noflag(skb, attrtype: INET_ULP_INFO_MPTCP); |
24 | if (!start) |
25 | return -EMSGSIZE; |
26 | |
27 | rcu_read_lock(); |
28 | sf = rcu_dereference(inet_csk(sk)->icsk_ulp_data); |
29 | if (!sf) { |
30 | err = 0; |
31 | goto nla_failure; |
32 | } |
33 | |
34 | if (sf->mp_capable) |
35 | flags |= MPTCP_SUBFLOW_FLAG_MCAP_REM; |
36 | if (sf->request_mptcp) |
37 | flags |= MPTCP_SUBFLOW_FLAG_MCAP_LOC; |
38 | if (sf->mp_join) |
39 | flags |= MPTCP_SUBFLOW_FLAG_JOIN_REM; |
40 | if (sf->request_join) |
41 | flags |= MPTCP_SUBFLOW_FLAG_JOIN_LOC; |
42 | if (sf->backup) |
43 | flags |= MPTCP_SUBFLOW_FLAG_BKUP_REM; |
44 | if (sf->request_bkup) |
45 | flags |= MPTCP_SUBFLOW_FLAG_BKUP_LOC; |
46 | if (sf->fully_established) |
47 | flags |= MPTCP_SUBFLOW_FLAG_FULLY_ESTABLISHED; |
48 | if (sf->conn_finished) |
49 | flags |= MPTCP_SUBFLOW_FLAG_CONNECTED; |
50 | if (sf->map_valid) |
51 | flags |= MPTCP_SUBFLOW_FLAG_MAPVALID; |
52 | |
53 | if (nla_put_u32(skb, attrtype: MPTCP_SUBFLOW_ATTR_TOKEN_REM, value: sf->remote_token) || |
54 | nla_put_u32(skb, attrtype: MPTCP_SUBFLOW_ATTR_TOKEN_LOC, value: sf->token) || |
55 | nla_put_u32(skb, attrtype: MPTCP_SUBFLOW_ATTR_RELWRITE_SEQ, |
56 | value: sf->rel_write_seq) || |
57 | nla_put_u64_64bit(skb, attrtype: MPTCP_SUBFLOW_ATTR_MAP_SEQ, value: sf->map_seq, |
58 | padattr: MPTCP_SUBFLOW_ATTR_PAD) || |
59 | nla_put_u32(skb, attrtype: MPTCP_SUBFLOW_ATTR_MAP_SFSEQ, |
60 | value: sf->map_subflow_seq) || |
61 | nla_put_u32(skb, attrtype: MPTCP_SUBFLOW_ATTR_SSN_OFFSET, value: sf->ssn_offset) || |
62 | nla_put_u16(skb, attrtype: MPTCP_SUBFLOW_ATTR_MAP_DATALEN, |
63 | value: sf->map_data_len) || |
64 | nla_put_u32(skb, attrtype: MPTCP_SUBFLOW_ATTR_FLAGS, value: flags) || |
65 | nla_put_u8(skb, attrtype: MPTCP_SUBFLOW_ATTR_ID_REM, value: sf->remote_id) || |
66 | nla_put_u8(skb, attrtype: MPTCP_SUBFLOW_ATTR_ID_LOC, value: sf->local_id)) { |
67 | err = -EMSGSIZE; |
68 | goto nla_failure; |
69 | } |
70 | |
71 | rcu_read_unlock(); |
72 | nla_nest_end(skb, start); |
73 | return 0; |
74 | |
75 | nla_failure: |
76 | rcu_read_unlock(); |
77 | nla_nest_cancel(skb, start); |
78 | return err; |
79 | } |
80 | |
81 | static size_t subflow_get_info_size(const struct sock *sk) |
82 | { |
83 | size_t size = 0; |
84 | |
85 | size += nla_total_size(payload: 0) + /* INET_ULP_INFO_MPTCP */ |
86 | nla_total_size(payload: 4) + /* MPTCP_SUBFLOW_ATTR_TOKEN_REM */ |
87 | nla_total_size(payload: 4) + /* MPTCP_SUBFLOW_ATTR_TOKEN_LOC */ |
88 | nla_total_size(payload: 4) + /* MPTCP_SUBFLOW_ATTR_RELWRITE_SEQ */ |
89 | nla_total_size_64bit(payload: 8) + /* MPTCP_SUBFLOW_ATTR_MAP_SEQ */ |
90 | nla_total_size(payload: 4) + /* MPTCP_SUBFLOW_ATTR_MAP_SFSEQ */ |
91 | nla_total_size(payload: 2) + /* MPTCP_SUBFLOW_ATTR_SSN_OFFSET */ |
92 | nla_total_size(payload: 2) + /* MPTCP_SUBFLOW_ATTR_MAP_DATALEN */ |
93 | nla_total_size(payload: 4) + /* MPTCP_SUBFLOW_ATTR_FLAGS */ |
94 | nla_total_size(payload: 1) + /* MPTCP_SUBFLOW_ATTR_ID_REM */ |
95 | nla_total_size(payload: 1) + /* MPTCP_SUBFLOW_ATTR_ID_LOC */ |
96 | 0; |
97 | return size; |
98 | } |
99 | |
100 | void mptcp_diag_subflow_init(struct tcp_ulp_ops *ops) |
101 | { |
102 | ops->get_info = subflow_get_info; |
103 | ops->get_info_size = subflow_get_info_size; |
104 | } |
105 | |