Paolo Abeni | ac3b45f | 2020-07-09 15:12:41 +0200 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0 |
| 2 | /* MPTCP socket monitoring support |
| 3 | * |
| 4 | * Copyright (c) 2020 Red Hat |
| 5 | * |
| 6 | * Author: Paolo Abeni <pabeni@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 sk_diag_dump(struct sock *sk, struct sk_buff *skb, |
| 17 | struct netlink_callback *cb, |
| 18 | const struct inet_diag_req_v2 *req, |
| 19 | struct nlattr *bc, bool net_admin) |
| 20 | { |
| 21 | if (!inet_diag_bc_sk(bc, sk)) |
| 22 | return 0; |
| 23 | |
| 24 | return inet_sk_diag_fill(sk, inet_csk(sk), skb, cb, req, NLM_F_MULTI, |
| 25 | net_admin); |
| 26 | } |
| 27 | |
| 28 | static int mptcp_diag_dump_one(struct netlink_callback *cb, |
| 29 | const struct inet_diag_req_v2 *req) |
| 30 | { |
| 31 | struct sk_buff *in_skb = cb->skb; |
| 32 | struct mptcp_sock *msk = NULL; |
| 33 | struct sk_buff *rep; |
| 34 | int err = -ENOENT; |
| 35 | struct net *net; |
| 36 | struct sock *sk; |
| 37 | |
| 38 | net = sock_net(in_skb->sk); |
Florian Westphal | ea1300b | 2021-09-23 17:04:11 -0700 | [diff] [blame] | 39 | msk = mptcp_token_get_sock(net, req->id.idiag_cookie[0]); |
Paolo Abeni | ac3b45f | 2020-07-09 15:12:41 +0200 | [diff] [blame] | 40 | if (!msk) |
| 41 | goto out_nosk; |
| 42 | |
| 43 | err = -ENOMEM; |
| 44 | sk = (struct sock *)msk; |
| 45 | rep = nlmsg_new(nla_total_size(sizeof(struct inet_diag_msg)) + |
| 46 | inet_diag_msg_attrs_size() + |
| 47 | nla_total_size(sizeof(struct mptcp_info)) + |
| 48 | nla_total_size(sizeof(struct inet_diag_meminfo)) + 64, |
| 49 | GFP_KERNEL); |
| 50 | if (!rep) |
| 51 | goto out; |
| 52 | |
| 53 | err = inet_sk_diag_fill(sk, inet_csk(sk), rep, cb, req, 0, |
| 54 | netlink_net_capable(in_skb, CAP_NET_ADMIN)); |
| 55 | if (err < 0) { |
| 56 | WARN_ON(err == -EMSGSIZE); |
| 57 | kfree_skb(rep); |
| 58 | goto out; |
| 59 | } |
Yajun Deng | 01757f5 | 2021-07-13 10:48:24 +0800 | [diff] [blame] | 60 | err = nlmsg_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid); |
| 61 | |
Paolo Abeni | ac3b45f | 2020-07-09 15:12:41 +0200 | [diff] [blame] | 62 | out: |
| 63 | sock_put(sk); |
| 64 | |
| 65 | out_nosk: |
| 66 | return err; |
| 67 | } |
| 68 | |
| 69 | static void mptcp_diag_dump(struct sk_buff *skb, struct netlink_callback *cb, |
| 70 | const struct inet_diag_req_v2 *r) |
| 71 | { |
| 72 | bool net_admin = netlink_net_capable(cb->skb, CAP_NET_ADMIN); |
| 73 | struct net *net = sock_net(skb->sk); |
| 74 | struct inet_diag_dump_data *cb_data; |
| 75 | struct mptcp_sock *msk; |
| 76 | struct nlattr *bc; |
| 77 | |
| 78 | cb_data = cb->data; |
| 79 | bc = cb_data->inet_diag_nla_bc; |
| 80 | |
| 81 | while ((msk = mptcp_token_iter_next(net, &cb->args[0], &cb->args[1])) != |
| 82 | NULL) { |
| 83 | struct inet_sock *inet = (struct inet_sock *)msk; |
| 84 | struct sock *sk = (struct sock *)msk; |
| 85 | int ret = 0; |
| 86 | |
| 87 | if (!(r->idiag_states & (1 << sk->sk_state))) |
| 88 | goto next; |
| 89 | if (r->sdiag_family != AF_UNSPEC && |
| 90 | sk->sk_family != r->sdiag_family) |
| 91 | goto next; |
| 92 | if (r->id.idiag_sport != inet->inet_sport && |
| 93 | r->id.idiag_sport) |
| 94 | goto next; |
| 95 | if (r->id.idiag_dport != inet->inet_dport && |
| 96 | r->id.idiag_dport) |
| 97 | goto next; |
| 98 | |
| 99 | ret = sk_diag_dump(sk, skb, cb, r, bc, net_admin); |
| 100 | next: |
| 101 | sock_put(sk); |
| 102 | if (ret < 0) { |
| 103 | /* will retry on the same position */ |
| 104 | cb->args[1]--; |
| 105 | break; |
| 106 | } |
| 107 | cond_resched(); |
| 108 | } |
| 109 | } |
| 110 | |
| 111 | static void mptcp_diag_get_info(struct sock *sk, struct inet_diag_msg *r, |
| 112 | void *_info) |
| 113 | { |
| 114 | struct mptcp_sock *msk = mptcp_sk(sk); |
| 115 | struct mptcp_info *info = _info; |
Paolo Abeni | ac3b45f | 2020-07-09 15:12:41 +0200 | [diff] [blame] | 116 | |
| 117 | r->idiag_rqueue = sk_rmem_alloc_get(sk); |
| 118 | r->idiag_wqueue = sk_wmem_alloc_get(sk); |
| 119 | if (!info) |
| 120 | return; |
| 121 | |
Florian Westphal | 61bc6e8 | 2021-09-17 16:33:18 -0700 | [diff] [blame] | 122 | mptcp_diag_fill_info(msk, info); |
Paolo Abeni | ac3b45f | 2020-07-09 15:12:41 +0200 | [diff] [blame] | 123 | } |
| 124 | |
| 125 | static const struct inet_diag_handler mptcp_diag_handler = { |
| 126 | .dump = mptcp_diag_dump, |
| 127 | .dump_one = mptcp_diag_dump_one, |
| 128 | .idiag_get_info = mptcp_diag_get_info, |
| 129 | .idiag_type = IPPROTO_MPTCP, |
| 130 | .idiag_info_size = sizeof(struct mptcp_info), |
| 131 | }; |
| 132 | |
| 133 | static int __init mptcp_diag_init(void) |
| 134 | { |
| 135 | return inet_diag_register(&mptcp_diag_handler); |
| 136 | } |
| 137 | |
| 138 | static void __exit mptcp_diag_exit(void) |
| 139 | { |
| 140 | inet_diag_unregister(&mptcp_diag_handler); |
| 141 | } |
| 142 | |
| 143 | module_init(mptcp_diag_init); |
| 144 | module_exit(mptcp_diag_exit); |
| 145 | MODULE_LICENSE("GPL"); |
| 146 | MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-262 /* AF_INET - IPPROTO_MPTCP */); |