| Davide Caratti | 5147dfb | 2020-03-27 14:48:49 -0700 | [diff] [blame] | 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, 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, MPTCP_SUBFLOW_ATTR_TOKEN_REM, sf->remote_token) || |
| 54 | nla_put_u32(skb, MPTCP_SUBFLOW_ATTR_TOKEN_LOC, sf->token) || |
| 55 | nla_put_u32(skb, MPTCP_SUBFLOW_ATTR_RELWRITE_SEQ, |
| 56 | sf->rel_write_seq) || |
| 57 | nla_put_u64_64bit(skb, MPTCP_SUBFLOW_ATTR_MAP_SEQ, sf->map_seq, |
| 58 | MPTCP_SUBFLOW_ATTR_PAD) || |
| 59 | nla_put_u32(skb, MPTCP_SUBFLOW_ATTR_MAP_SFSEQ, |
| 60 | sf->map_subflow_seq) || |
| 61 | nla_put_u32(skb, MPTCP_SUBFLOW_ATTR_SSN_OFFSET, sf->ssn_offset) || |
| 62 | nla_put_u16(skb, MPTCP_SUBFLOW_ATTR_MAP_DATALEN, |
| 63 | sf->map_data_len) || |
| 64 | nla_put_u32(skb, MPTCP_SUBFLOW_ATTR_FLAGS, flags) || |
| 65 | nla_put_u8(skb, MPTCP_SUBFLOW_ATTR_ID_REM, sf->remote_id) || |
| 66 | nla_put_u8(skb, MPTCP_SUBFLOW_ATTR_ID_LOC, 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(0) + /* INET_ULP_INFO_MPTCP */ |
| 86 | nla_total_size(4) + /* MPTCP_SUBFLOW_ATTR_TOKEN_REM */ |
| 87 | nla_total_size(4) + /* MPTCP_SUBFLOW_ATTR_TOKEN_LOC */ |
| 88 | nla_total_size(4) + /* MPTCP_SUBFLOW_ATTR_RELWRITE_SEQ */ |
| 89 | nla_total_size_64bit(8) + /* MPTCP_SUBFLOW_ATTR_MAP_SEQ */ |
| 90 | nla_total_size(4) + /* MPTCP_SUBFLOW_ATTR_MAP_SFSEQ */ |
| 91 | nla_total_size(2) + /* MPTCP_SUBFLOW_ATTR_SSN_OFFSET */ |
| 92 | nla_total_size(2) + /* MPTCP_SUBFLOW_ATTR_MAP_DATALEN */ |
| 93 | nla_total_size(4) + /* MPTCP_SUBFLOW_ATTR_FLAGS */ |
| 94 | nla_total_size(1) + /* MPTCP_SUBFLOW_ATTR_ID_REM */ |
| 95 | nla_total_size(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 | } |