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

/*
 * 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
 *
 *		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.
 *
 * 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 <net/ping.h>

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_dgram_ops,
	.flags =     INET_PROTOSW_REUSE,
};


/* 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;
}

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 iif = 0;
	struct flowi6 fl6;
	int err;
	int hlimit;
	struct dst_entry *dst;
	struct rt6_info *rt;
	struct pingfakehdr pfh;

	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(struct sockaddr_in6) ||
		    u->sin6_family != AF_INET6) {
			return -EINVAL;
		}
		if (sk->sk_bound_dev_if &&
		    sk->sk_bound_dev_if != u->sin6_scope_id) {
			return -EINVAL;
		}
		daddr = &(u->sin6_addr);
		iif = u->sin6_scope_id;
	} else {
		if (sk->sk_state != TCP_ESTABLISHED)
			return -EDESTADDRREQ;
		daddr = &sk->sk_v6_daddr;
	}

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

	addr_type = ipv6_addr_type(daddr);
	if (__ipv6_addr_needs_scope_id(addr_type) && !iif)
		return -EINVAL;
	if (addr_type & IPV6_ADDR_MAPPED)
		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_mark = sk->sk_mark;
	fl6.fl6_icmp_type = user_icmph.icmp6_type;
	fl6.fl6_icmp_code = user_icmph.icmp6_code;
	security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));

	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;

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

	np = inet6_sk(sk);
	if (!np)
		return -EBADF;

	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;

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

	lock_sock(sk);
	err = ip6_append_data(sk, ping_getfrag, &pfh, len,
			      0, hlimit,
			      np->tclass, NULL, &fl6, rt,
			      MSG_DONTWAIT, np->dontfrag);

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

	if (err)
		return err;

	return len;
}

#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 struct ping_seq_afinfo ping_v6_seq_afinfo = {
	.name		= "icmp6",
	.family		= AF_INET6,
	.seq_fops       = &ping_seq_fops,
	.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)
{
	return ping_proc_register(net, &ping_v6_seq_afinfo);
}

static void __net_init ping_v6_proc_exit_net(struct net *net)
{
	return ping_proc_unregister(net, &ping_v6_seq_afinfo);
}

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
6d0bfe22 LC	1	/*
	2	* INET An implementation of the TCP/IP protocol suite for the LINUX
	3	* operating system. INET is implemented using the BSD Socket
	4	* interface as the means of communication with the user level.
	5	*
	6	* "Ping" sockets
	7	*
	8	* This program is free software; you can redistribute it and/or
	9	* modify it under the terms of the GNU General Public License
	10	* as published by the Free Software Foundation; either version
	11	* 2 of the License, or (at your option) any later version.
	12	*
	13	* Based on ipv4/ping.c code.
	14	*
	15	* Authors: Lorenzo Colitti (IPv6 support)
	16	* Vasiliy Kulikov / Openwall (IPv4 implementation, for Linux 2.6),
	17	* Pavel Kankovsky (IPv4 implementation, for Linux 2.4.32)
	18	*
	19	*/
	20
	21	#include <net/addrconf.h>
	22	#include <net/ipv6.h>
	23	#include <net/ip6_route.h>
	24	#include <net/protocol.h>
	25	#include <net/udp.h>
	26	#include <net/transp_v6.h>
	27	#include <net/ping.h>
	28
	29	struct proto pingv6_prot = {
	30	.name = "PINGv6",
	31	.owner = THIS_MODULE,
	32	.init = ping_init_sock,
	33	.close = ping_close,
82b276cd	34	.connect = ip6_datagram_connect_v6_only,
6d0bfe22 LC	35	.disconnect = udp_disconnect,
	36	.setsockopt = ipv6_setsockopt,
	37	.getsockopt = ipv6_getsockopt,
	38	.sendmsg = ping_v6_sendmsg,
	39	.recvmsg = ping_recvmsg,
	40	.bind = ping_bind,
	41	.backlog_rcv = ping_queue_rcv_skb,
	42	.hash = ping_hash,
	43	.unhash = ping_unhash,
	44	.get_port = ping_get_port,
	45	.obj_size = sizeof(struct raw6_sock),
	46	};
	47	EXPORT_SYMBOL_GPL(pingv6_prot);
	48
	49	static struct inet_protosw pingv6_protosw = {
	50	.type = SOCK_DGRAM,
	51	.protocol = IPPROTO_ICMPV6,
	52	.prot = &pingv6_prot,
	53	.ops = &inet6_dgram_ops,
6d0bfe22 LC	54	.flags = INET_PROTOSW_REUSE,
	55	};
	56
	57
	58	/* Compatibility glue so we can support IPv6 when it's compiled as a module */
85fbaa75 HFS	59	static int dummy_ipv6_recv_error(struct sock sk, struct msghdr msg, int len,
85fbaa75 HFS	60	int *addr_len)
6d0bfe22 LC	61	{
	62	return -EAFNOSUPPORT;
	63	}
4b261c75	64	static void dummy_ip6_datagram_recv_ctl(struct sock sk, struct msghdr msg,
a06a2d37	65	struct sk_buff *skb)
6d0bfe22	66	{
6d0bfe22	67	}
a06a2d37	68	static int dummy_icmpv6_err_convert(u8 type, u8 code, int *err)
6d0bfe22 LC	69	{
	70	return -EAFNOSUPPORT;
	71	}
a06a2d37 WF	72	static void dummy_ipv6_icmp_error(struct sock sk, struct sk_buff skb, int err,
	73	__be16 port, u32 info, u8 *payload) {}
	74	static int dummy_ipv6_chk_addr(struct net net, const struct in6_addr addr,
	75	const struct net_device *dev, int strict)
6d0bfe22 LC	76	{
	77	return 0;
	78	}
	79
1b784140	80	int ping_v6_sendmsg(struct sock sk, struct msghdr msg, size_t len)
6d0bfe22 LC	81	{
	82	struct inet_sock *inet = inet_sk(sk);
	83	struct ipv6_pinfo *np = inet6_sk(sk);
	84	struct icmp6hdr user_icmph;
	85	int addr_type;
	86	struct in6_addr *daddr;
	87	int iif = 0;
	88	struct flowi6 fl6;
	89	int err;
	90	int hlimit;
	91	struct dst_entry *dst;
	92	struct rt6_info *rt;
	93	struct pingfakehdr pfh;
	94
	95	pr_debug("ping_v6_sendmsg(sk=%p,sk->num=%u)\n", inet, inet->inet_num);
	96
	97	err = ping_common_sendmsg(AF_INET6, msg, len, &user_icmph,
	98	sizeof(user_icmph));
	99	if (err)
	100	return err;
	101
	102	if (msg->msg_name) {
342dfc30	103	DECLARE_SOCKADDR(struct sockaddr_in6 *, u, msg->msg_name);
6d0bfe22 LC	104	if (msg->msg_namelen < sizeof(struct sockaddr_in6) \|\|
	105	u->sin6_family != AF_INET6) {
	106	return -EINVAL;
	107	}
	108	if (sk->sk_bound_dev_if &&
	109	sk->sk_bound_dev_if != u->sin6_scope_id) {
	110	return -EINVAL;
	111	}
	112	daddr = &(u->sin6_addr);
	113	iif = u->sin6_scope_id;
	114	} else {
	115	if (sk->sk_state != TCP_ESTABLISHED)
	116	return -EDESTADDRREQ;
efe4208f	117	daddr = &sk->sk_v6_daddr;
6d0bfe22 LC	118	}
	119
	120	if (!iif)
	121	iif = sk->sk_bound_dev_if;
	122
	123	addr_type = ipv6_addr_type(daddr);
	124	if (__ipv6_addr_needs_scope_id(addr_type) && !iif)
	125	return -EINVAL;
	126	if (addr_type & IPV6_ADDR_MAPPED)
	127	return -EINVAL;
	128
	129	/* TODO: use ip6_datagram_send_ctl to get options from cmsg */
	130
	131	memset(&fl6, 0, sizeof(fl6));
	132
	133	fl6.flowi6_proto = IPPROTO_ICMPV6;
	134	fl6.saddr = np->saddr;
	135	fl6.daddr = *daddr;
bf439b31	136	fl6.flowi6_mark = sk->sk_mark;
6d0bfe22 LC	137	fl6.fl6_icmp_type = user_icmph.icmp6_type;
	138	fl6.fl6_icmp_code = user_icmph.icmp6_code;
	139	security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
	140
	141	if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr))
	142	fl6.flowi6_oif = np->mcast_oif;
	143	else if (!fl6.flowi6_oif)
	144	fl6.flowi6_oif = np->ucast_oif;
	145
0e0d44ab	146	dst = ip6_sk_dst_lookup_flow(sk, &fl6, daddr);
6d0bfe22 LC	147	if (IS_ERR(dst))
	148	return PTR_ERR(dst);
	149	rt = (struct rt6_info *) dst;
	150
	151	np = inet6_sk(sk);
	152	if (!np)
	153	return -EBADF;
	154
	155	if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr))
	156	fl6.flowi6_oif = np->mcast_oif;
	157	else if (!fl6.flowi6_oif)
	158	fl6.flowi6_oif = np->ucast_oif;
	159
	160	pfh.icmph.type = user_icmph.icmp6_type;
	161	pfh.icmph.code = user_icmph.icmp6_code;
	162	pfh.icmph.checksum = 0;
	163	pfh.icmph.un.echo.id = inet->inet_sport;
	164	pfh.icmph.un.echo.sequence = user_icmph.icmp6_sequence;
cacdc7d2	165	pfh.msg = msg;
6d0bfe22 LC	166	pfh.wcheck = 0;
	167	pfh.family = AF_INET6;
	168
5c98631c	169	hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst);
6d0bfe22	170
a1bdc455	171	lock_sock(sk);
6d0bfe22 LC	172	err = ip6_append_data(sk, ping_getfrag, &pfh, len,
	173	0, hlimit,
	174	np->tclass, NULL, &fl6, rt,
	175	MSG_DONTWAIT, np->dontfrag);
	176
	177	if (err) {
43a43b60 HFS	178	ICMP6_INC_STATS(sock_net(sk), rt->rt6i_idev,
43a43b60 HFS	179	ICMP6_MIB_OUTERRORS);
6d0bfe22 LC	180	ip6_flush_pending_frames(sk);
	181	} else {
	182	err = icmpv6_push_pending_frames(sk, &fl6,
	183	(struct icmp6hdr *) &pfh.icmph,
	184	len);
	185	}
a1bdc455	186	release_sock(sk);
6d0bfe22	187
fbfe80c8 LC	188	if (err)
	189	return err;
	190
	191	return len;
6d0bfe22	192	}
d862e546 LC	193
	194	#ifdef CONFIG_PROC_FS
	195	static void ping_v6_seq_start(struct seq_file seq, loff_t *pos)
	196	{
	197	return ping_seq_start(seq, pos, AF_INET6);
	198	}
	199
a06a2d37	200	static int ping_v6_seq_show(struct seq_file seq, void v)
d862e546 LC	201	{
	202	if (v == SEQ_START_TOKEN) {
	203	seq_puts(seq, IPV6_SEQ_DGRAM_HEADER);
	204	} else {
	205	int bucket = ((struct ping_iter_state *) seq->private)->bucket;
	206	struct inet_sock *inet = inet_sk(v);
	207	__u16 srcp = ntohs(inet->inet_sport);
	208	__u16 destp = ntohs(inet->inet_dport);
	209	ip6_dgram_sock_seq_show(seq, v, srcp, destp, bucket);
	210	}
	211	return 0;
	212	}
	213
	214	static struct ping_seq_afinfo ping_v6_seq_afinfo = {
	215	.name = "icmp6",
	216	.family = AF_INET6,
	217	.seq_fops = &ping_seq_fops,
	218	.seq_ops = {
	219	.start = ping_v6_seq_start,
	220	.show = ping_v6_seq_show,
	221	.next = ping_seq_next,
	222	.stop = ping_seq_stop,
	223	},
	224	};
	225
	226	static int __net_init ping_v6_proc_init_net(struct net *net)
	227	{
	228	return ping_proc_register(net, &ping_v6_seq_afinfo);
	229	}
	230
	231	static void __net_init ping_v6_proc_exit_net(struct net *net)
	232	{
	233	return ping_proc_unregister(net, &ping_v6_seq_afinfo);
	234	}
	235
	236	static struct pernet_operations ping_v6_net_ops = {
	237	.init = ping_v6_proc_init_net,
	238	.exit = ping_v6_proc_exit_net,
	239	};
	240	#endif
	241
	242	int __init pingv6_init(void)
	243	{
	244	#ifdef CONFIG_PROC_FS
	245	int ret = register_pernet_subsys(&ping_v6_net_ops);
	246	if (ret)
	247	return ret;
	248	#endif
	249	pingv6_ops.ipv6_recv_error = ipv6_recv_error;
4b261c75 HFS	250	pingv6_ops.ip6_datagram_recv_common_ctl = ip6_datagram_recv_common_ctl;
	251	pingv6_ops.ip6_datagram_recv_specific_ctl =
	252	ip6_datagram_recv_specific_ctl;
d862e546 LC	253	pingv6_ops.icmpv6_err_convert = icmpv6_err_convert;
	254	pingv6_ops.ipv6_icmp_error = ipv6_icmp_error;
	255	pingv6_ops.ipv6_chk_addr = ipv6_chk_addr;
	256	return inet6_register_protosw(&pingv6_protosw);
	257	}
	258
	259	/* This never gets called because it's not possible to unload the ipv6 module,
	260	* but just in case.
	261	*/
	262	void pingv6_exit(void)
	263	{
	264	pingv6_ops.ipv6_recv_error = dummy_ipv6_recv_error;
4b261c75 HFS	265	pingv6_ops.ip6_datagram_recv_common_ctl = dummy_ip6_datagram_recv_ctl;
4b261c75 HFS	266	pingv6_ops.ip6_datagram_recv_specific_ctl = dummy_ip6_datagram_recv_ctl;
d862e546 LC	267	pingv6_ops.icmpv6_err_convert = dummy_icmpv6_err_convert;
	268	pingv6_ops.ipv6_icmp_error = dummy_ipv6_icmp_error;
	269	pingv6_ops.ipv6_chk_addr = dummy_ipv6_chk_addr;
	270	#ifdef CONFIG_PROC_FS
	271	unregister_pernet_subsys(&ping_v6_net_ops);
	272	#endif
	273	inet6_unregister_protosw(&pingv6_protosw);
	274	}