Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 192 insertions, 0 deletions

diff --git a/net/ipv4/tcp_diag.c b/net/ipv4/tcp_diag.c
new file mode 100644
index 000000000..2a46f9f81
--- /dev/null
+++ b/net/ipv4/tcp_diag.c
@@ -0,0 +1,192 @@
+/*
+ * tcp_diag.c	Module for monitoring TCP transport protocols sockets.
+ *
+ * Authors:	Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
+ *
+ *	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.
+ */
+
+#include <linux/module.h>
+#include <linux/net.h>
+#include <linux/sock_diag.h>
+#include <linux/inet_diag.h>
+
+#include <linux/tcp.h>
+
+#include <net/netlink.h>
+#include <net/tcp.h>
+
+static void tcp_diag_get_info(struct sock *sk, struct inet_diag_msg *r,
+			      void *_info)
+{
+	struct tcp_info *info = _info;
+
+	if (inet_sk_state_load(sk) == TCP_LISTEN) {
+		r->idiag_rqueue = sk->sk_ack_backlog;
+		r->idiag_wqueue = sk->sk_max_ack_backlog;
+	} else if (sk->sk_type == SOCK_STREAM) {
+		const struct tcp_sock *tp = tcp_sk(sk);
+
+		r->idiag_rqueue = max_t(int, READ_ONCE(tp->rcv_nxt) -
+					     READ_ONCE(tp->copied_seq), 0);
+		r->idiag_wqueue = READ_ONCE(tp->write_seq) - tp->snd_una;
+	}
+	if (info)
+		tcp_get_info(sk, info);
+}
+
+#ifdef CONFIG_TCP_MD5SIG
+static void tcp_diag_md5sig_fill(struct tcp_diag_md5sig *info,
+				 const struct tcp_md5sig_key *key)
+{
+	info->tcpm_family = key->family;
+	info->tcpm_prefixlen = key->prefixlen;
+	info->tcpm_keylen = key->keylen;
+	memcpy(info->tcpm_key, key->key, key->keylen);
+
+	if (key->family == AF_INET)
+		info->tcpm_addr[0] = key->addr.a4.s_addr;
+	#if IS_ENABLED(CONFIG_IPV6)
+	else if (key->family == AF_INET6)
+		memcpy(&info->tcpm_addr, &key->addr.a6,
+		       sizeof(info->tcpm_addr));
+	#endif
+}
+
+static int tcp_diag_put_md5sig(struct sk_buff *skb,
+			       const struct tcp_md5sig_info *md5sig)
+{
+	const struct tcp_md5sig_key *key;
+	struct tcp_diag_md5sig *info;
+	struct nlattr *attr;
+	int md5sig_count = 0;
+
+	hlist_for_each_entry_rcu(key, &md5sig->head, node)
+		md5sig_count++;
+	if (md5sig_count == 0)
+		return 0;
+
+	attr = nla_reserve(skb, INET_DIAG_MD5SIG,
+			   md5sig_count * sizeof(struct tcp_diag_md5sig));
+	if (!attr)
+		return -EMSGSIZE;
+
+	info = nla_data(attr);
+	memset(info, 0, md5sig_count * sizeof(struct tcp_diag_md5sig));
+	hlist_for_each_entry_rcu(key, &md5sig->head, node) {
+		tcp_diag_md5sig_fill(info++, key);
+		if (--md5sig_count == 0)
+			break;
+	}
+
+	return 0;
+}
+#endif
+
+static int tcp_diag_get_aux(struct sock *sk, bool net_admin,
+			    struct sk_buff *skb)
+{
+#ifdef CONFIG_TCP_MD5SIG
+	if (net_admin) {
+		struct tcp_md5sig_info *md5sig;
+		int err = 0;
+
+		rcu_read_lock();
+		md5sig = rcu_dereference(tcp_sk(sk)->md5sig_info);
+		if (md5sig)
+			err = tcp_diag_put_md5sig(skb, md5sig);
+		rcu_read_unlock();
+		if (err < 0)
+			return err;
+	}
+#endif
+
+	return 0;
+}
+
+static size_t tcp_diag_get_aux_size(struct sock *sk, bool net_admin)
+{
+	size_t size = 0;
+
+#ifdef CONFIG_TCP_MD5SIG
+	if (net_admin && sk_fullsock(sk)) {
+		const struct tcp_md5sig_info *md5sig;
+		const struct tcp_md5sig_key *key;
+		size_t md5sig_count = 0;
+
+		rcu_read_lock();
+		md5sig = rcu_dereference(tcp_sk(sk)->md5sig_info);
+		if (md5sig) {
+			hlist_for_each_entry_rcu(key, &md5sig->head, node)
+				md5sig_count++;
+		}
+		rcu_read_unlock();
+		size += nla_total_size(md5sig_count *
+				       sizeof(struct tcp_diag_md5sig));
+	}
+#endif
+
+	return size;
+}
+
+static void tcp_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
+			  const struct inet_diag_req_v2 *r, struct nlattr *bc)
+{
+	inet_diag_dump_icsk(&tcp_hashinfo, skb, cb, r, bc);
+}
+
+static int tcp_diag_dump_one(struct sk_buff *in_skb, const struct nlmsghdr *nlh,
+			     const struct inet_diag_req_v2 *req)
+{
+	return inet_diag_dump_one_icsk(&tcp_hashinfo, in_skb, nlh, req);
+}
+
+#ifdef CONFIG_INET_DIAG_DESTROY
+static int tcp_diag_destroy(struct sk_buff *in_skb,
+			    const struct inet_diag_req_v2 *req)
+{
+	struct net *net = sock_net(in_skb->sk);
+	struct sock *sk = inet_diag_find_one_icsk(net, &tcp_hashinfo, req);
+	int err;
+
+	if (IS_ERR(sk))
+		return PTR_ERR(sk);
+
+	err = sock_diag_destroy(sk, ECONNABORTED);
+
+	sock_gen_put(sk);
+
+	return err;
+}
+#endif
+
+static const struct inet_diag_handler tcp_diag_handler = {
+	.dump			= tcp_diag_dump,
+	.dump_one		= tcp_diag_dump_one,
+	.idiag_get_info		= tcp_diag_get_info,
+	.idiag_get_aux		= tcp_diag_get_aux,
+	.idiag_get_aux_size	= tcp_diag_get_aux_size,
+	.idiag_type		= IPPROTO_TCP,
+	.idiag_info_size	= sizeof(struct tcp_info),
+#ifdef CONFIG_INET_DIAG_DESTROY
+	.destroy		= tcp_diag_destroy,
+#endif
+};
+
+static int __init tcp_diag_init(void)
+{
+	return inet_diag_register(&tcp_diag_handler);
+}
+
+static void __exit tcp_diag_exit(void)
+{
+	inet_diag_unregister(&tcp_diag_handler);
+}
+
+module_init(tcp_diag_init);
+module_exit(tcp_diag_exit);
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-6 /* AF_INET - IPPROTO_TCP */);