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![Thomas Gleixner](/assets/img/avatar_default.png)
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
302 lines
7.3 KiB
C
302 lines
7.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* udp_diag.c Module for monitoring UDP transport protocols sockets.
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*
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* Authors: Pavel Emelyanov, <xemul@parallels.com>
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*/
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#include <linux/module.h>
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#include <linux/inet_diag.h>
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#include <linux/udp.h>
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#include <net/udp.h>
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#include <net/udplite.h>
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#include <linux/sock_diag.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, NULL, skb, req,
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sk_user_ns(NETLINK_CB(cb->skb).sk),
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NETLINK_CB(cb->skb).portid,
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cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh, net_admin);
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}
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static int udp_dump_one(struct udp_table *tbl, struct sk_buff *in_skb,
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const struct nlmsghdr *nlh,
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const struct inet_diag_req_v2 *req)
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{
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int err = -EINVAL;
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struct sock *sk = NULL;
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struct sk_buff *rep;
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struct net *net = sock_net(in_skb->sk);
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rcu_read_lock();
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if (req->sdiag_family == AF_INET)
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/* src and dst are swapped for historical reasons */
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sk = __udp4_lib_lookup(net,
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req->id.idiag_src[0], req->id.idiag_sport,
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req->id.idiag_dst[0], req->id.idiag_dport,
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req->id.idiag_if, 0, tbl, NULL);
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#if IS_ENABLED(CONFIG_IPV6)
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else if (req->sdiag_family == AF_INET6)
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sk = __udp6_lib_lookup(net,
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(struct in6_addr *)req->id.idiag_src,
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req->id.idiag_sport,
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(struct in6_addr *)req->id.idiag_dst,
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req->id.idiag_dport,
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req->id.idiag_if, 0, tbl, NULL);
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#endif
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if (sk && !refcount_inc_not_zero(&sk->sk_refcnt))
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sk = NULL;
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rcu_read_unlock();
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err = -ENOENT;
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if (!sk)
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goto out_nosk;
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err = sock_diag_check_cookie(sk, req->id.idiag_cookie);
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if (err)
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goto out;
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err = -ENOMEM;
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rep = nlmsg_new(sizeof(struct inet_diag_msg) +
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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, NULL, rep, req,
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sk_user_ns(NETLINK_CB(in_skb).sk),
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NETLINK_CB(in_skb).portid,
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nlh->nlmsg_seq, 0, nlh,
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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 = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
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MSG_DONTWAIT);
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if (err > 0)
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err = 0;
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out:
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if (sk)
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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 udp_dump(struct udp_table *table, struct sk_buff *skb,
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struct netlink_callback *cb,
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const struct inet_diag_req_v2 *r, struct nlattr *bc)
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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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int num, s_num, slot, s_slot;
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s_slot = cb->args[0];
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num = s_num = cb->args[1];
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for (slot = s_slot; slot <= table->mask; s_num = 0, slot++) {
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struct udp_hslot *hslot = &table->hash[slot];
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struct sock *sk;
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num = 0;
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if (hlist_empty(&hslot->head))
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continue;
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spin_lock_bh(&hslot->lock);
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sk_for_each(sk, &hslot->head) {
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struct inet_sock *inet = inet_sk(sk);
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if (!net_eq(sock_net(sk), net))
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continue;
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if (num < s_num)
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goto next;
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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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if (sk_diag_dump(sk, skb, cb, r, bc, net_admin) < 0) {
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spin_unlock_bh(&hslot->lock);
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goto done;
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}
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next:
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num++;
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}
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spin_unlock_bh(&hslot->lock);
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}
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done:
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cb->args[0] = slot;
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cb->args[1] = num;
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}
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static void udp_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
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const struct inet_diag_req_v2 *r, struct nlattr *bc)
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{
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udp_dump(&udp_table, skb, cb, r, bc);
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}
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static int udp_diag_dump_one(struct sk_buff *in_skb, const struct nlmsghdr *nlh,
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const struct inet_diag_req_v2 *req)
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{
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return udp_dump_one(&udp_table, in_skb, nlh, req);
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}
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static void udp_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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r->idiag_rqueue = udp_rqueue_get(sk);
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r->idiag_wqueue = sk_wmem_alloc_get(sk);
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}
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#ifdef CONFIG_INET_DIAG_DESTROY
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static int __udp_diag_destroy(struct sk_buff *in_skb,
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const struct inet_diag_req_v2 *req,
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struct udp_table *tbl)
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{
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struct net *net = sock_net(in_skb->sk);
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struct sock *sk;
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int err;
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rcu_read_lock();
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if (req->sdiag_family == AF_INET)
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sk = __udp4_lib_lookup(net,
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req->id.idiag_dst[0], req->id.idiag_dport,
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req->id.idiag_src[0], req->id.idiag_sport,
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req->id.idiag_if, 0, tbl, NULL);
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#if IS_ENABLED(CONFIG_IPV6)
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else if (req->sdiag_family == AF_INET6) {
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if (ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_dst) &&
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ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_src))
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sk = __udp4_lib_lookup(net,
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req->id.idiag_dst[3], req->id.idiag_dport,
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req->id.idiag_src[3], req->id.idiag_sport,
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req->id.idiag_if, 0, tbl, NULL);
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else
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sk = __udp6_lib_lookup(net,
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(struct in6_addr *)req->id.idiag_dst,
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req->id.idiag_dport,
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(struct in6_addr *)req->id.idiag_src,
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req->id.idiag_sport,
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req->id.idiag_if, 0, tbl, NULL);
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}
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#endif
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else {
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rcu_read_unlock();
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return -EINVAL;
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}
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if (sk && !refcount_inc_not_zero(&sk->sk_refcnt))
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sk = NULL;
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rcu_read_unlock();
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if (!sk)
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return -ENOENT;
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if (sock_diag_check_cookie(sk, req->id.idiag_cookie)) {
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sock_put(sk);
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return -ENOENT;
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}
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err = sock_diag_destroy(sk, ECONNABORTED);
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sock_put(sk);
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return err;
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}
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static int udp_diag_destroy(struct sk_buff *in_skb,
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const struct inet_diag_req_v2 *req)
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{
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return __udp_diag_destroy(in_skb, req, &udp_table);
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}
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static int udplite_diag_destroy(struct sk_buff *in_skb,
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const struct inet_diag_req_v2 *req)
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{
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return __udp_diag_destroy(in_skb, req, &udplite_table);
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}
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#endif
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static const struct inet_diag_handler udp_diag_handler = {
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.dump = udp_diag_dump,
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.dump_one = udp_diag_dump_one,
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.idiag_get_info = udp_diag_get_info,
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.idiag_type = IPPROTO_UDP,
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.idiag_info_size = 0,
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#ifdef CONFIG_INET_DIAG_DESTROY
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.destroy = udp_diag_destroy,
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#endif
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};
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static void udplite_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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struct nlattr *bc)
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{
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udp_dump(&udplite_table, skb, cb, r, bc);
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}
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static int udplite_diag_dump_one(struct sk_buff *in_skb, const struct nlmsghdr *nlh,
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const struct inet_diag_req_v2 *req)
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{
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return udp_dump_one(&udplite_table, in_skb, nlh, req);
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}
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static const struct inet_diag_handler udplite_diag_handler = {
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.dump = udplite_diag_dump,
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.dump_one = udplite_diag_dump_one,
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.idiag_get_info = udp_diag_get_info,
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.idiag_type = IPPROTO_UDPLITE,
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.idiag_info_size = 0,
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#ifdef CONFIG_INET_DIAG_DESTROY
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.destroy = udplite_diag_destroy,
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#endif
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};
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static int __init udp_diag_init(void)
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{
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int err;
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err = inet_diag_register(&udp_diag_handler);
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if (err)
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goto out;
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err = inet_diag_register(&udplite_diag_handler);
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if (err)
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goto out_lite;
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out:
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return err;
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out_lite:
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inet_diag_unregister(&udp_diag_handler);
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goto out;
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}
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static void __exit udp_diag_exit(void)
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{
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inet_diag_unregister(&udplite_diag_handler);
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inet_diag_unregister(&udp_diag_handler);
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}
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module_init(udp_diag_init);
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module_exit(udp_diag_exit);
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MODULE_LICENSE("GPL");
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MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-17 /* AF_INET - IPPROTO_UDP */);
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MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-136 /* AF_INET - IPPROTO_UDPLITE */);
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