147 строки
3.5 KiB
C
147 строки
3.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* MPTCP socket monitoring support
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*
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* Copyright (c) 2020 Red Hat
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*
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* Author: Paolo Abeni <pabeni@redhat.com>
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*/
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#include <linux/kernel.h>
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#include <linux/net.h>
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#include <linux/inet_diag.h>
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#include <net/netlink.h>
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#include <uapi/linux/mptcp.h>
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#include "protocol.h"
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static int sk_diag_dump(struct sock *sk, struct sk_buff *skb,
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struct netlink_callback *cb,
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const struct inet_diag_req_v2 *req,
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struct nlattr *bc, bool net_admin)
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{
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if (!inet_diag_bc_sk(bc, sk))
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return 0;
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return inet_sk_diag_fill(sk, inet_csk(sk), skb, cb, req, NLM_F_MULTI,
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net_admin);
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}
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static int mptcp_diag_dump_one(struct netlink_callback *cb,
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const struct inet_diag_req_v2 *req)
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{
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struct sk_buff *in_skb = cb->skb;
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struct mptcp_sock *msk = NULL;
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struct sk_buff *rep;
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int err = -ENOENT;
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struct net *net;
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struct sock *sk;
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net = sock_net(in_skb->sk);
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msk = mptcp_token_get_sock(net, req->id.idiag_cookie[0]);
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if (!msk)
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goto out_nosk;
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err = -ENOMEM;
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sk = (struct sock *)msk;
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rep = nlmsg_new(nla_total_size(sizeof(struct inet_diag_msg)) +
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inet_diag_msg_attrs_size() +
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nla_total_size(sizeof(struct mptcp_info)) +
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nla_total_size(sizeof(struct inet_diag_meminfo)) + 64,
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GFP_KERNEL);
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if (!rep)
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goto out;
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err = inet_sk_diag_fill(sk, inet_csk(sk), rep, cb, req, 0,
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netlink_net_capable(in_skb, CAP_NET_ADMIN));
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if (err < 0) {
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WARN_ON(err == -EMSGSIZE);
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kfree_skb(rep);
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goto out;
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}
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err = nlmsg_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid);
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out:
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sock_put(sk);
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out_nosk:
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return err;
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}
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static void mptcp_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
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const struct inet_diag_req_v2 *r)
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{
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bool net_admin = netlink_net_capable(cb->skb, CAP_NET_ADMIN);
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struct net *net = sock_net(skb->sk);
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struct inet_diag_dump_data *cb_data;
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struct mptcp_sock *msk;
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struct nlattr *bc;
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cb_data = cb->data;
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bc = cb_data->inet_diag_nla_bc;
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while ((msk = mptcp_token_iter_next(net, &cb->args[0], &cb->args[1])) !=
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NULL) {
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struct inet_sock *inet = (struct inet_sock *)msk;
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struct sock *sk = (struct sock *)msk;
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int ret = 0;
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if (!(r->idiag_states & (1 << sk->sk_state)))
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goto next;
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if (r->sdiag_family != AF_UNSPEC &&
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sk->sk_family != r->sdiag_family)
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goto next;
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if (r->id.idiag_sport != inet->inet_sport &&
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r->id.idiag_sport)
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goto next;
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if (r->id.idiag_dport != inet->inet_dport &&
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r->id.idiag_dport)
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goto next;
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ret = sk_diag_dump(sk, skb, cb, r, bc, net_admin);
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next:
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sock_put(sk);
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if (ret < 0) {
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/* will retry on the same position */
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cb->args[1]--;
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break;
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}
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cond_resched();
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}
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}
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static void mptcp_diag_get_info(struct sock *sk, struct inet_diag_msg *r,
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void *_info)
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{
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struct mptcp_sock *msk = mptcp_sk(sk);
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struct mptcp_info *info = _info;
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r->idiag_rqueue = sk_rmem_alloc_get(sk);
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r->idiag_wqueue = sk_wmem_alloc_get(sk);
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if (!info)
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return;
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mptcp_diag_fill_info(msk, info);
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}
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static const struct inet_diag_handler mptcp_diag_handler = {
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.dump = mptcp_diag_dump,
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.dump_one = mptcp_diag_dump_one,
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.idiag_get_info = mptcp_diag_get_info,
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.idiag_type = IPPROTO_MPTCP,
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.idiag_info_size = sizeof(struct mptcp_info),
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};
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static int __init mptcp_diag_init(void)
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{
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return inet_diag_register(&mptcp_diag_handler);
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}
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static void __exit mptcp_diag_exit(void)
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{
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inet_diag_unregister(&mptcp_diag_handler);
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}
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module_init(mptcp_diag_init);
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module_exit(mptcp_diag_exit);
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MODULE_LICENSE("GPL");
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MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-262 /* AF_INET - IPPROTO_MPTCP */);
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