[mirror_ubuntu-jammy-kernel.git] / net / ipv6 / ping.c

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * INET		An implementation of the TCP/IP protocol suite for the LINUX
 *		operating system.  INET is implemented using the  BSD Socket
 *		interface as the means of communication with the user level.
 *
 *		"Ping" sockets
 *
 * Based on ipv4/ping.c code.
 *
 * Authors:	Lorenzo Colitti (IPv6 support)
 *		Vasiliy Kulikov / Openwall (IPv4 implementation, for Linux 2.6),
 *		Pavel Kankovsky (IPv4 implementation, for Linux 2.4.32)
 */

#include <net/addrconf.h>
#include <net/ipv6.h>
#include <net/ip6_route.h>
#include <net/protocol.h>
#include <net/udp.h>
#include <net/transp_v6.h>
#include <linux/proc_fs.h>
#include <net/ping.h>

/* Compatibility glue so we can support IPv6 when it's compiled as a module */
static int dummy_ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len,
				 int *addr_len)
{
	return -EAFNOSUPPORT;
}
static void dummy_ip6_datagram_recv_ctl(struct sock *sk, struct msghdr *msg,
				       struct sk_buff *skb)
{
}
static int dummy_icmpv6_err_convert(u8 type, u8 code, int *err)
{
	return -EAFNOSUPPORT;
}
static void dummy_ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
				  __be16 port, u32 info, u8 *payload) {}
static int dummy_ipv6_chk_addr(struct net *net, const struct in6_addr *addr,
			       const struct net_device *dev, int strict)
{
	return 0;
}

static int ping_v6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
{
	struct inet_sock *inet = inet_sk(sk);
	struct ipv6_pinfo *np = inet6_sk(sk);
	struct icmp6hdr user_icmph;
	int addr_type;
	struct in6_addr *daddr;
	int oif = 0;
	struct flowi6 fl6;
	int err;
	struct dst_entry *dst;
	struct rt6_info *rt;
	struct pingfakehdr pfh;
	struct ipcm6_cookie ipc6;

	pr_debug("ping_v6_sendmsg(sk=%p,sk->num=%u)\n", inet, inet->inet_num);

	err = ping_common_sendmsg(AF_INET6, msg, len, &user_icmph,
				  sizeof(user_icmph));
	if (err)
		return err;

	if (msg->msg_name) {
		DECLARE_SOCKADDR(struct sockaddr_in6 *, u, msg->msg_name);
		if (msg->msg_namelen < sizeof(*u))
			return -EINVAL;
		if (u->sin6_family != AF_INET6) {
			return -EAFNOSUPPORT;
		}
		daddr = &(u->sin6_addr);
		if (__ipv6_addr_needs_scope_id(ipv6_addr_type(daddr)))
			oif = u->sin6_scope_id;
	} else {
		if (sk->sk_state != TCP_ESTABLISHED)
			return -EDESTADDRREQ;
		daddr = &sk->sk_v6_daddr;
	}

	if (!oif)
		oif = sk->sk_bound_dev_if;

	if (!oif)
		oif = np->sticky_pktinfo.ipi6_ifindex;

	if (!oif && ipv6_addr_is_multicast(daddr))
		oif = np->mcast_oif;
	else if (!oif)
		oif = np->ucast_oif;

	addr_type = ipv6_addr_type(daddr);
	if ((__ipv6_addr_needs_scope_id(addr_type) && !oif) ||
	    (addr_type & IPV6_ADDR_MAPPED) ||
	    (oif && sk->sk_bound_dev_if && oif != sk->sk_bound_dev_if))
		return -EINVAL;

	/* TODO: use ip6_datagram_send_ctl to get options from cmsg */

	memset(&fl6, 0, sizeof(fl6));

	fl6.flowi6_proto = IPPROTO_ICMPV6;
	fl6.saddr = np->saddr;
	fl6.daddr = *daddr;
	fl6.flowi6_oif = oif;
	fl6.flowi6_mark = sk->sk_mark;
	fl6.flowi6_uid = sk->sk_uid;
	fl6.fl6_icmp_type = user_icmph.icmp6_type;
	fl6.fl6_icmp_code = user_icmph.icmp6_code;
	security_sk_classify_flow(sk, flowi6_to_flowi_common(&fl6));

	ipcm6_init_sk(&ipc6, np);
	ipc6.sockc.mark = sk->sk_mark;
	fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel);

	dst = ip6_sk_dst_lookup_flow(sk, &fl6, daddr, false);
	if (IS_ERR(dst))
		return PTR_ERR(dst);
	rt = (struct rt6_info *) dst;

	if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr))
		fl6.flowi6_oif = np->mcast_oif;
	else if (!fl6.flowi6_oif)
		fl6.flowi6_oif = np->ucast_oif;

	pfh.icmph.type = user_icmph.icmp6_type;
	pfh.icmph.code = user_icmph.icmp6_code;
	pfh.icmph.checksum = 0;
	pfh.icmph.un.echo.id = inet->inet_sport;
	pfh.icmph.un.echo.sequence = user_icmph.icmp6_sequence;
	pfh.msg = msg;
	pfh.wcheck = 0;
	pfh.family = AF_INET6;

	ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst);

	lock_sock(sk);
	err = ip6_append_data(sk, ping_getfrag, &pfh, len,
			      0, &ipc6, &fl6, rt,
			      MSG_DONTWAIT);

	if (err) {
		ICMP6_INC_STATS(sock_net(sk), rt->rt6i_idev,
				ICMP6_MIB_OUTERRORS);
		ip6_flush_pending_frames(sk);
	} else {
		icmpv6_push_pending_frames(sk, &fl6,
					   (struct icmp6hdr *)&pfh.icmph, len);
	}
	release_sock(sk);

	dst_release(dst);

	if (err)
		return err;

	return len;
}

struct proto pingv6_prot = {
	.name =		"PINGv6",
	.owner =	THIS_MODULE,
	.init =		ping_init_sock,
	.close =	ping_close,
	.connect =	ip6_datagram_connect_v6_only,
	.disconnect =	__udp_disconnect,
	.setsockopt =	ipv6_setsockopt,
	.getsockopt =	ipv6_getsockopt,
	.sendmsg =	ping_v6_sendmsg,
	.recvmsg =	ping_recvmsg,
	.bind =		ping_bind,
	.backlog_rcv =	ping_queue_rcv_skb,
	.hash =		ping_hash,
	.unhash =	ping_unhash,
	.get_port =	ping_get_port,
	.obj_size =	sizeof(struct raw6_sock),
};
EXPORT_SYMBOL_GPL(pingv6_prot);

static struct inet_protosw pingv6_protosw = {
	.type =      SOCK_DGRAM,
	.protocol =  IPPROTO_ICMPV6,
	.prot =      &pingv6_prot,
	.ops =       &inet6_sockraw_ops,
	.flags =     INET_PROTOSW_REUSE,
};

#ifdef CONFIG_PROC_FS
static void *ping_v6_seq_start(struct seq_file *seq, loff_t *pos)
{
	return ping_seq_start(seq, pos, AF_INET6);
}

static int ping_v6_seq_show(struct seq_file *seq, void *v)
{
	if (v == SEQ_START_TOKEN) {
		seq_puts(seq, IPV6_SEQ_DGRAM_HEADER);
	} else {
		int bucket = ((struct ping_iter_state *) seq->private)->bucket;
		struct inet_sock *inet = inet_sk(v);
		__u16 srcp = ntohs(inet->inet_sport);
		__u16 destp = ntohs(inet->inet_dport);
		ip6_dgram_sock_seq_show(seq, v, srcp, destp, bucket);
	}
	return 0;
}

static const struct seq_operations ping_v6_seq_ops = {
	.start		= ping_v6_seq_start,
	.show		= ping_v6_seq_show,
	.next		= ping_seq_next,
	.stop		= ping_seq_stop,
};

static int __net_init ping_v6_proc_init_net(struct net *net)
{
	if (!proc_create_net("icmp6", 0444, net->proc_net, &ping_v6_seq_ops,
			sizeof(struct ping_iter_state)))
		return -ENOMEM;
	return 0;
}

static void __net_exit ping_v6_proc_exit_net(struct net *net)
{
	remove_proc_entry("icmp6", net->proc_net);
}

static struct pernet_operations ping_v6_net_ops = {
	.init = ping_v6_proc_init_net,
	.exit = ping_v6_proc_exit_net,
};
#endif

int __init pingv6_init(void)
{
#ifdef CONFIG_PROC_FS
	int ret = register_pernet_subsys(&ping_v6_net_ops);
	if (ret)
		return ret;
#endif
	pingv6_ops.ipv6_recv_error = ipv6_recv_error;
	pingv6_ops.ip6_datagram_recv_common_ctl = ip6_datagram_recv_common_ctl;
	pingv6_ops.ip6_datagram_recv_specific_ctl =
		ip6_datagram_recv_specific_ctl;
	pingv6_ops.icmpv6_err_convert = icmpv6_err_convert;
	pingv6_ops.ipv6_icmp_error = ipv6_icmp_error;
	pingv6_ops.ipv6_chk_addr = ipv6_chk_addr;
	return inet6_register_protosw(&pingv6_protosw);
}

/* This never gets called because it's not possible to unload the ipv6 module,
 * but just in case.
 */
void pingv6_exit(void)
{
	pingv6_ops.ipv6_recv_error = dummy_ipv6_recv_error;
	pingv6_ops.ip6_datagram_recv_common_ctl = dummy_ip6_datagram_recv_ctl;
	pingv6_ops.ip6_datagram_recv_specific_ctl = dummy_ip6_datagram_recv_ctl;
	pingv6_ops.icmpv6_err_convert = dummy_icmpv6_err_convert;
	pingv6_ops.ipv6_icmp_error = dummy_ipv6_icmp_error;
	pingv6_ops.ipv6_chk_addr = dummy_ipv6_chk_addr;
#ifdef CONFIG_PROC_FS
	unregister_pernet_subsys(&ping_v6_net_ops);
#endif
	inet6_unregister_protosw(&pingv6_protosw);
}
Commit	Line	Data
2874c5fd	1	// SPDX-License-Identifier: GPL-2.0-or-later
6d0bfe22 LC	2	/*
	3	* INET An implementation of the TCP/IP protocol suite for the LINUX
	4	* operating system. INET is implemented using the BSD Socket
	5	* interface as the means of communication with the user level.
	6	*
	7	* "Ping" sockets
	8	*
6d0bfe22 LC	9	* Based on ipv4/ping.c code.
	10	*
	11	* Authors: Lorenzo Colitti (IPv6 support)
	12	* Vasiliy Kulikov / Openwall (IPv4 implementation, for Linux 2.6),
	13	* Pavel Kankovsky (IPv4 implementation, for Linux 2.4.32)
6d0bfe22 LC	14	*/
	15
	16	#include <net/addrconf.h>
	17	#include <net/ipv6.h>
	18	#include <net/ip6_route.h>
	19	#include <net/protocol.h>
	20	#include <net/udp.h>
	21	#include <net/transp_v6.h>
f4550221	22	#include <linux/proc_fs.h>
6d0bfe22 LC	23	#include <net/ping.h>
6d0bfe22 LC	24
6d0bfe22	25	/* Compatibility glue so we can support IPv6 when it's compiled as a module */
85fbaa75 HFS	26	static int dummy_ipv6_recv_error(struct sock sk, struct msghdr msg, int len,
85fbaa75 HFS	27	int *addr_len)
6d0bfe22 LC	28	{
	29	return -EAFNOSUPPORT;
	30	}
4b261c75	31	static void dummy_ip6_datagram_recv_ctl(struct sock sk, struct msghdr msg,
a06a2d37	32	struct sk_buff *skb)
6d0bfe22	33	{
6d0bfe22	34	}
a06a2d37	35	static int dummy_icmpv6_err_convert(u8 type, u8 code, int *err)
6d0bfe22 LC	36	{
	37	return -EAFNOSUPPORT;
	38	}
a06a2d37 WF	39	static void dummy_ipv6_icmp_error(struct sock sk, struct sk_buff skb, int err,
	40	__be16 port, u32 info, u8 *payload) {}
	41	static int dummy_ipv6_chk_addr(struct net net, const struct in6_addr addr,
	42	const struct net_device *dev, int strict)
6d0bfe22 LC	43	{
	44	return 0;
	45	}
	46
6579a023	47	static int ping_v6_sendmsg(struct sock sk, struct msghdr msg, size_t len)
6d0bfe22 LC	48	{
	49	struct inet_sock *inet = inet_sk(sk);
	50	struct ipv6_pinfo *np = inet6_sk(sk);
	51	struct icmp6hdr user_icmph;
	52	int addr_type;
	53	struct in6_addr *daddr;
5e457896	54	int oif = 0;
6d0bfe22 LC	55	struct flowi6 fl6;
6d0bfe22 LC	56	int err;
6d0bfe22 LC	57	struct dst_entry *dst;
	58	struct rt6_info *rt;
	59	struct pingfakehdr pfh;
26879da5	60	struct ipcm6_cookie ipc6;
6d0bfe22 LC	61
	62	pr_debug("ping_v6_sendmsg(sk=%p,sk->num=%u)\n", inet, inet->inet_num);
	63
	64	err = ping_common_sendmsg(AF_INET6, msg, len, &user_icmph,
	65	sizeof(user_icmph));
	66	if (err)
	67	return err;
	68
	69	if (msg->msg_name) {
342dfc30	70	DECLARE_SOCKADDR(struct sockaddr_in6 *, u, msg->msg_name);
9145736d	71	if (msg->msg_namelen < sizeof(*u))
6d0bfe22	72	return -EINVAL;
9145736d LC	73	if (u->sin6_family != AF_INET6) {
9145736d LC	74	return -EAFNOSUPPORT;
6d0bfe22	75	}
6d0bfe22	76	daddr = &(u->sin6_addr);
5e457896 LC	77	if (__ipv6_addr_needs_scope_id(ipv6_addr_type(daddr)))
5e457896 LC	78	oif = u->sin6_scope_id;
6d0bfe22 LC	79	} else {
	80	if (sk->sk_state != TCP_ESTABLISHED)
	81	return -EDESTADDRREQ;
efe4208f	82	daddr = &sk->sk_v6_daddr;
6d0bfe22 LC	83	}
6d0bfe22 LC	84
5e457896 LC	85	if (!oif)
	86	oif = sk->sk_bound_dev_if;
	87
	88	if (!oif)
	89	oif = np->sticky_pktinfo.ipi6_ifindex;
	90
	91	if (!oif && ipv6_addr_is_multicast(daddr))
	92	oif = np->mcast_oif;
	93	else if (!oif)
	94	oif = np->ucast_oif;
6d0bfe22 LC	95
6d0bfe22 LC	96	addr_type = ipv6_addr_type(daddr);
5e457896 LC	97	if ((__ipv6_addr_needs_scope_id(addr_type) && !oif) \|\|
	98	(addr_type & IPV6_ADDR_MAPPED) \|\|
	99	(oif && sk->sk_bound_dev_if && oif != sk->sk_bound_dev_if))
6d0bfe22 LC	100	return -EINVAL;
	101
	102	/* TODO: use ip6_datagram_send_ctl to get options from cmsg */
	103
	104	memset(&fl6, 0, sizeof(fl6));
	105
	106	fl6.flowi6_proto = IPPROTO_ICMPV6;
	107	fl6.saddr = np->saddr;
	108	fl6.daddr = *daddr;
5e457896	109	fl6.flowi6_oif = oif;
bf439b31	110	fl6.flowi6_mark = sk->sk_mark;
e2d118a1	111	fl6.flowi6_uid = sk->sk_uid;
6d0bfe22 LC	112	fl6.fl6_icmp_type = user_icmph.icmp6_type;
6d0bfe22 LC	113	fl6.fl6_icmp_code = user_icmph.icmp6_code;
3df98d79	114	security_sk_classify_flow(sk, flowi6_to_flowi_common(&fl6));
6d0bfe22	115
b515430a	116	ipcm6_init_sk(&ipc6, np);
cd8700e4	117	ipc6.sockc.mark = sk->sk_mark;
38b7097b HFS	118	fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel);
38b7097b HFS	119
96818159	120	dst = ip6_sk_dst_lookup_flow(sk, &fl6, daddr, false);
6d0bfe22 LC	121	if (IS_ERR(dst))
	122	return PTR_ERR(dst);
	123	rt = (struct rt6_info *) dst;
	124
6d0bfe22 LC	125	if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr))
	126	fl6.flowi6_oif = np->mcast_oif;
	127	else if (!fl6.flowi6_oif)
	128	fl6.flowi6_oif = np->ucast_oif;
	129
	130	pfh.icmph.type = user_icmph.icmp6_type;
	131	pfh.icmph.code = user_icmph.icmp6_code;
	132	pfh.icmph.checksum = 0;
	133	pfh.icmph.un.echo.id = inet->inet_sport;
	134	pfh.icmph.un.echo.sequence = user_icmph.icmp6_sequence;
cacdc7d2	135	pfh.msg = msg;
6d0bfe22 LC	136	pfh.wcheck = 0;
	137	pfh.family = AF_INET6;
	138
26879da5	139	ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst);
6d0bfe22	140
a1bdc455	141	lock_sock(sk);
6d0bfe22	142	err = ip6_append_data(sk, ping_getfrag, &pfh, len,
26879da5	143	0, &ipc6, &fl6, rt,
5fdaa88d	144	MSG_DONTWAIT);
6d0bfe22 LC	145
6d0bfe22 LC	146	if (err) {
43a43b60 HFS	147	ICMP6_INC_STATS(sock_net(sk), rt->rt6i_idev,
43a43b60 HFS	148	ICMP6_MIB_OUTERRORS);
6d0bfe22 LC	149	ip6_flush_pending_frames(sk);
6d0bfe22 LC	150	} else {
4e64b1ed JP	151	icmpv6_push_pending_frames(sk, &fl6,
4e64b1ed JP	152	(struct icmp6hdr *)&pfh.icmph, len);
6d0bfe22	153	}
a1bdc455	154	release_sock(sk);
6d0bfe22	155
03c2778a DJ	156	dst_release(dst);
03c2778a DJ	157
fbfe80c8 LC	158	if (err)
	159	return err;
	160
	161	return len;
6d0bfe22	162	}
d862e546	163
6579a023 HY	164	struct proto pingv6_prot = {
	165	.name = "PINGv6",
	166	.owner = THIS_MODULE,
	167	.init = ping_init_sock,
	168	.close = ping_close,
	169	.connect = ip6_datagram_connect_v6_only,
286c72de	170	.disconnect = __udp_disconnect,
6579a023 HY	171	.setsockopt = ipv6_setsockopt,
	172	.getsockopt = ipv6_getsockopt,
	173	.sendmsg = ping_v6_sendmsg,
	174	.recvmsg = ping_recvmsg,
	175	.bind = ping_bind,
	176	.backlog_rcv = ping_queue_rcv_skb,
	177	.hash = ping_hash,
	178	.unhash = ping_unhash,
	179	.get_port = ping_get_port,
	180	.obj_size = sizeof(struct raw6_sock),
	181	};
	182	EXPORT_SYMBOL_GPL(pingv6_prot);
	183
	184	static struct inet_protosw pingv6_protosw = {
	185	.type = SOCK_DGRAM,
	186	.protocol = IPPROTO_ICMPV6,
	187	.prot = &pingv6_prot,
77d4b1d3	188	.ops = &inet6_sockraw_ops,
6579a023 HY	189	.flags = INET_PROTOSW_REUSE,
	190	};
	191
d862e546 LC	192	#ifdef CONFIG_PROC_FS
	193	static void ping_v6_seq_start(struct seq_file seq, loff_t *pos)
	194	{
	195	return ping_seq_start(seq, pos, AF_INET6);
	196	}
	197
a06a2d37	198	static int ping_v6_seq_show(struct seq_file seq, void v)
d862e546 LC	199	{
	200	if (v == SEQ_START_TOKEN) {
	201	seq_puts(seq, IPV6_SEQ_DGRAM_HEADER);
	202	} else {
	203	int bucket = ((struct ping_iter_state *) seq->private)->bucket;
	204	struct inet_sock *inet = inet_sk(v);
	205	__u16 srcp = ntohs(inet->inet_sport);
	206	__u16 destp = ntohs(inet->inet_dport);
	207	ip6_dgram_sock_seq_show(seq, v, srcp, destp, bucket);
	208	}
	209	return 0;
	210	}
	211
f4550221 CH	212	static const struct seq_operations ping_v6_seq_ops = {
	213	.start = ping_v6_seq_start,
	214	.show = ping_v6_seq_show,
	215	.next = ping_seq_next,
	216	.stop = ping_seq_stop,
	217	};
	218
d862e546 LC	219	static int __net_init ping_v6_proc_init_net(struct net *net)
d862e546 LC	220	{
c3506372 CH	221	if (!proc_create_net("icmp6", 0444, net->proc_net, &ping_v6_seq_ops,
c3506372 CH	222	sizeof(struct ping_iter_state)))
f4550221 CH	223	return -ENOMEM;
f4550221 CH	224	return 0;
d862e546 LC	225	}
d862e546 LC	226
d23dbc47	227	static void __net_exit ping_v6_proc_exit_net(struct net *net)
d862e546	228	{
f4550221	229	remove_proc_entry("icmp6", net->proc_net);
d862e546 LC	230	}
	231
	232	static struct pernet_operations ping_v6_net_ops = {
	233	.init = ping_v6_proc_init_net,
	234	.exit = ping_v6_proc_exit_net,
	235	};
	236	#endif
	237
	238	int __init pingv6_init(void)
	239	{
	240	#ifdef CONFIG_PROC_FS
	241	int ret = register_pernet_subsys(&ping_v6_net_ops);
	242	if (ret)
	243	return ret;
	244	#endif
	245	pingv6_ops.ipv6_recv_error = ipv6_recv_error;
4b261c75 HFS	246	pingv6_ops.ip6_datagram_recv_common_ctl = ip6_datagram_recv_common_ctl;
	247	pingv6_ops.ip6_datagram_recv_specific_ctl =
	248	ip6_datagram_recv_specific_ctl;
d862e546 LC	249	pingv6_ops.icmpv6_err_convert = icmpv6_err_convert;
	250	pingv6_ops.ipv6_icmp_error = ipv6_icmp_error;
	251	pingv6_ops.ipv6_chk_addr = ipv6_chk_addr;
	252	return inet6_register_protosw(&pingv6_protosw);
	253	}
	254
	255	/* This never gets called because it's not possible to unload the ipv6 module,
	256	* but just in case.
	257	*/
	258	void pingv6_exit(void)
	259	{
	260	pingv6_ops.ipv6_recv_error = dummy_ipv6_recv_error;
4b261c75 HFS	261	pingv6_ops.ip6_datagram_recv_common_ctl = dummy_ip6_datagram_recv_ctl;
4b261c75 HFS	262	pingv6_ops.ip6_datagram_recv_specific_ctl = dummy_ip6_datagram_recv_ctl;
d862e546 LC	263	pingv6_ops.icmpv6_err_convert = dummy_icmpv6_err_convert;
	264	pingv6_ops.ipv6_icmp_error = dummy_ipv6_icmp_error;
	265	pingv6_ops.ipv6_chk_addr = dummy_ipv6_chk_addr;
	266	#ifdef CONFIG_PROC_FS
	267	unregister_pernet_subsys(&ping_v6_net_ops);
	268	#endif
	269	inet6_unregister_protosw(&pingv6_protosw);
	270	}