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170 lines
4.5 KiB
170 lines
4.5 KiB
// 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 <[email protected]> |
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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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u32 flags = 0; |
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bool slow; |
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u8 val; |
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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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slow = lock_sock_fast(sk); |
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info->mptcpi_subflows = READ_ONCE(msk->pm.subflows); |
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info->mptcpi_add_addr_signal = READ_ONCE(msk->pm.add_addr_signaled); |
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info->mptcpi_add_addr_accepted = READ_ONCE(msk->pm.add_addr_accepted); |
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info->mptcpi_local_addr_used = READ_ONCE(msk->pm.local_addr_used); |
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info->mptcpi_subflows_max = mptcp_pm_get_subflows_max(msk); |
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val = mptcp_pm_get_add_addr_signal_max(msk); |
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info->mptcpi_add_addr_signal_max = val; |
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val = mptcp_pm_get_add_addr_accept_max(msk); |
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info->mptcpi_add_addr_accepted_max = val; |
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info->mptcpi_local_addr_max = mptcp_pm_get_local_addr_max(msk); |
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if (test_bit(MPTCP_FALLBACK_DONE, &msk->flags)) |
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flags |= MPTCP_INFO_FLAG_FALLBACK; |
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if (READ_ONCE(msk->can_ack)) |
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flags |= MPTCP_INFO_FLAG_REMOTE_KEY_RECEIVED; |
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info->mptcpi_flags = flags; |
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info->mptcpi_token = READ_ONCE(msk->token); |
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info->mptcpi_write_seq = READ_ONCE(msk->write_seq); |
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info->mptcpi_snd_una = READ_ONCE(msk->snd_una); |
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info->mptcpi_rcv_nxt = READ_ONCE(msk->ack_seq); |
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info->mptcpi_csum_enabled = READ_ONCE(msk->csum_enabled); |
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unlock_sock_fast(sk, slow); |
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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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