[linux.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>

/* 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 sockcm_cookie junk = {0};
	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(&fl6));

	ipc6.tclass = np->tclass;
	fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel);

	dst = ip6_sk_dst_lookup_flow(sk, &fl6,  daddr);
	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);
	ipc6.dontfrag = np->dontfrag;
	ipc6.opt = NULL;

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

	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 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
6d0bfe22	29	/* Compatibility glue so we can support IPv6 when it's compiled as a module */
85fbaa75 HFS	30	static int dummy_ipv6_recv_error(struct sock sk, struct msghdr msg, int len,
85fbaa75 HFS	31	int *addr_len)
6d0bfe22 LC	32	{
	33	return -EAFNOSUPPORT;
	34	}
4b261c75	35	static void dummy_ip6_datagram_recv_ctl(struct sock sk, struct msghdr msg,
a06a2d37	36	struct sk_buff *skb)
6d0bfe22	37	{
6d0bfe22	38	}
a06a2d37	39	static int dummy_icmpv6_err_convert(u8 type, u8 code, int *err)
6d0bfe22 LC	40	{
	41	return -EAFNOSUPPORT;
	42	}
a06a2d37 WF	43	static void dummy_ipv6_icmp_error(struct sock sk, struct sk_buff skb, int err,
	44	__be16 port, u32 info, u8 *payload) {}
	45	static int dummy_ipv6_chk_addr(struct net net, const struct in6_addr addr,
	46	const struct net_device *dev, int strict)
6d0bfe22 LC	47	{
	48	return 0;
	49	}
	50
6579a023	51	static int ping_v6_sendmsg(struct sock sk, struct msghdr msg, size_t len)
6d0bfe22 LC	52	{
	53	struct inet_sock *inet = inet_sk(sk);
	54	struct ipv6_pinfo *np = inet6_sk(sk);
	55	struct icmp6hdr user_icmph;
	56	int addr_type;
	57	struct in6_addr *daddr;
5e457896	58	int oif = 0;
6d0bfe22 LC	59	struct flowi6 fl6;
6d0bfe22 LC	60	int err;
6d0bfe22 LC	61	struct dst_entry *dst;
	62	struct rt6_info *rt;
	63	struct pingfakehdr pfh;
c14ac945	64	struct sockcm_cookie junk = {0};
26879da5	65	struct ipcm6_cookie ipc6;
6d0bfe22 LC	66
	67	pr_debug("ping_v6_sendmsg(sk=%p,sk->num=%u)\n", inet, inet->inet_num);
	68
	69	err = ping_common_sendmsg(AF_INET6, msg, len, &user_icmph,
	70	sizeof(user_icmph));
	71	if (err)
	72	return err;
	73
	74	if (msg->msg_name) {
342dfc30	75	DECLARE_SOCKADDR(struct sockaddr_in6 *, u, msg->msg_name);
9145736d	76	if (msg->msg_namelen < sizeof(*u))
6d0bfe22	77	return -EINVAL;
9145736d LC	78	if (u->sin6_family != AF_INET6) {
9145736d LC	79	return -EAFNOSUPPORT;
6d0bfe22	80	}
6d0bfe22	81	daddr = &(u->sin6_addr);
5e457896 LC	82	if (__ipv6_addr_needs_scope_id(ipv6_addr_type(daddr)))
5e457896 LC	83	oif = u->sin6_scope_id;
6d0bfe22 LC	84	} else {
	85	if (sk->sk_state != TCP_ESTABLISHED)
	86	return -EDESTADDRREQ;
efe4208f	87	daddr = &sk->sk_v6_daddr;
6d0bfe22 LC	88	}
6d0bfe22 LC	89
5e457896 LC	90	if (!oif)
	91	oif = sk->sk_bound_dev_if;
	92
	93	if (!oif)
	94	oif = np->sticky_pktinfo.ipi6_ifindex;
	95
	96	if (!oif && ipv6_addr_is_multicast(daddr))
	97	oif = np->mcast_oif;
	98	else if (!oif)
	99	oif = np->ucast_oif;
6d0bfe22 LC	100
6d0bfe22 LC	101	addr_type = ipv6_addr_type(daddr);
5e457896 LC	102	if ((__ipv6_addr_needs_scope_id(addr_type) && !oif) \|\|
	103	(addr_type & IPV6_ADDR_MAPPED) \|\|
	104	(oif && sk->sk_bound_dev_if && oif != sk->sk_bound_dev_if))
6d0bfe22 LC	105	return -EINVAL;
	106
	107	/* TODO: use ip6_datagram_send_ctl to get options from cmsg */
	108
	109	memset(&fl6, 0, sizeof(fl6));
	110
	111	fl6.flowi6_proto = IPPROTO_ICMPV6;
	112	fl6.saddr = np->saddr;
	113	fl6.daddr = *daddr;
5e457896	114	fl6.flowi6_oif = oif;
bf439b31	115	fl6.flowi6_mark = sk->sk_mark;
e2d118a1	116	fl6.flowi6_uid = sk->sk_uid;
6d0bfe22 LC	117	fl6.fl6_icmp_type = user_icmph.icmp6_type;
	118	fl6.fl6_icmp_code = user_icmph.icmp6_code;
	119	security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
	120
38b7097b HFS	121	ipc6.tclass = np->tclass;
	122	fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel);
	123
0e0d44ab	124	dst = ip6_sk_dst_lookup_flow(sk, &fl6, daddr);
6d0bfe22 LC	125	if (IS_ERR(dst))
	126	return PTR_ERR(dst);
	127	rt = (struct rt6_info *) dst;
	128
6d0bfe22 LC	129	if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr))
	130	fl6.flowi6_oif = np->mcast_oif;
	131	else if (!fl6.flowi6_oif)
	132	fl6.flowi6_oif = np->ucast_oif;
	133
	134	pfh.icmph.type = user_icmph.icmp6_type;
	135	pfh.icmph.code = user_icmph.icmp6_code;
	136	pfh.icmph.checksum = 0;
	137	pfh.icmph.un.echo.id = inet->inet_sport;
	138	pfh.icmph.un.echo.sequence = user_icmph.icmp6_sequence;
cacdc7d2	139	pfh.msg = msg;
6d0bfe22 LC	140	pfh.wcheck = 0;
	141	pfh.family = AF_INET6;
	142
26879da5	143	ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst);
26879da5 WW	144	ipc6.dontfrag = np->dontfrag;
26879da5 WW	145	ipc6.opt = NULL;
6d0bfe22	146
a1bdc455	147	lock_sock(sk);
6d0bfe22	148	err = ip6_append_data(sk, ping_getfrag, &pfh, len,
26879da5 WW	149	0, &ipc6, &fl6, rt,
26879da5 WW	150	MSG_DONTWAIT, &junk);
6d0bfe22 LC	151
6d0bfe22 LC	152	if (err) {
43a43b60 HFS	153	ICMP6_INC_STATS(sock_net(sk), rt->rt6i_idev,
43a43b60 HFS	154	ICMP6_MIB_OUTERRORS);
6d0bfe22 LC	155	ip6_flush_pending_frames(sk);
6d0bfe22 LC	156	} else {
4e64b1ed JP	157	icmpv6_push_pending_frames(sk, &fl6,
4e64b1ed JP	158	(struct icmp6hdr *)&pfh.icmph, len);
6d0bfe22	159	}
a1bdc455	160	release_sock(sk);
6d0bfe22	161
03c2778a DJ	162	dst_release(dst);
03c2778a DJ	163
fbfe80c8 LC	164	if (err)
	165	return err;
	166
	167	return len;
6d0bfe22	168	}
d862e546	169
6579a023 HY	170	struct proto pingv6_prot = {
	171	.name = "PINGv6",
	172	.owner = THIS_MODULE,
	173	.init = ping_init_sock,
	174	.close = ping_close,
	175	.connect = ip6_datagram_connect_v6_only,
286c72de	176	.disconnect = __udp_disconnect,
6579a023 HY	177	.setsockopt = ipv6_setsockopt,
	178	.getsockopt = ipv6_getsockopt,
	179	.sendmsg = ping_v6_sendmsg,
	180	.recvmsg = ping_recvmsg,
	181	.bind = ping_bind,
	182	.backlog_rcv = ping_queue_rcv_skb,
	183	.hash = ping_hash,
	184	.unhash = ping_unhash,
	185	.get_port = ping_get_port,
	186	.obj_size = sizeof(struct raw6_sock),
	187	};
	188	EXPORT_SYMBOL_GPL(pingv6_prot);
	189
	190	static struct inet_protosw pingv6_protosw = {
	191	.type = SOCK_DGRAM,
	192	.protocol = IPPROTO_ICMPV6,
	193	.prot = &pingv6_prot,
77d4b1d3	194	.ops = &inet6_sockraw_ops,
6579a023 HY	195	.flags = INET_PROTOSW_REUSE,
	196	};
	197
d862e546 LC	198	#ifdef CONFIG_PROC_FS
	199	static void ping_v6_seq_start(struct seq_file seq, loff_t *pos)
	200	{
	201	return ping_seq_start(seq, pos, AF_INET6);
	202	}
	203
a06a2d37	204	static int ping_v6_seq_show(struct seq_file seq, void v)
d862e546 LC	205	{
	206	if (v == SEQ_START_TOKEN) {
	207	seq_puts(seq, IPV6_SEQ_DGRAM_HEADER);
	208	} else {
	209	int bucket = ((struct ping_iter_state *) seq->private)->bucket;
	210	struct inet_sock *inet = inet_sk(v);
	211	__u16 srcp = ntohs(inet->inet_sport);
	212	__u16 destp = ntohs(inet->inet_dport);
	213	ip6_dgram_sock_seq_show(seq, v, srcp, destp, bucket);
	214	}
	215	return 0;
	216	}
	217
	218	static struct ping_seq_afinfo ping_v6_seq_afinfo = {
	219	.name = "icmp6",
	220	.family = AF_INET6,
	221	.seq_fops = &ping_seq_fops,
	222	.seq_ops = {
	223	.start = ping_v6_seq_start,
	224	.show = ping_v6_seq_show,
	225	.next = ping_seq_next,
	226	.stop = ping_seq_stop,
	227	},
	228	};
	229
	230	static int __net_init ping_v6_proc_init_net(struct net *net)
	231	{
	232	return ping_proc_register(net, &ping_v6_seq_afinfo);
	233	}
	234
	235	static void __net_init ping_v6_proc_exit_net(struct net *net)
	236	{
	237	return ping_proc_unregister(net, &ping_v6_seq_afinfo);
	238	}
	239
	240	static struct pernet_operations ping_v6_net_ops = {
	241	.init = ping_v6_proc_init_net,
	242	.exit = ping_v6_proc_exit_net,
	243	};
	244	#endif
	245
	246	int __init pingv6_init(void)
	247	{
	248	#ifdef CONFIG_PROC_FS
	249	int ret = register_pernet_subsys(&ping_v6_net_ops);
	250	if (ret)
	251	return ret;
	252	#endif
	253	pingv6_ops.ipv6_recv_error = ipv6_recv_error;
4b261c75 HFS	254	pingv6_ops.ip6_datagram_recv_common_ctl = ip6_datagram_recv_common_ctl;
	255	pingv6_ops.ip6_datagram_recv_specific_ctl =
	256	ip6_datagram_recv_specific_ctl;
d862e546 LC	257	pingv6_ops.icmpv6_err_convert = icmpv6_err_convert;
	258	pingv6_ops.ipv6_icmp_error = ipv6_icmp_error;
	259	pingv6_ops.ipv6_chk_addr = ipv6_chk_addr;
	260	return inet6_register_protosw(&pingv6_protosw);
	261	}
	262
	263	/* This never gets called because it's not possible to unload the ipv6 module,
	264	* but just in case.
	265	*/
	266	void pingv6_exit(void)
	267	{
	268	pingv6_ops.ipv6_recv_error = dummy_ipv6_recv_error;
4b261c75 HFS	269	pingv6_ops.ip6_datagram_recv_common_ctl = dummy_ip6_datagram_recv_ctl;
4b261c75 HFS	270	pingv6_ops.ip6_datagram_recv_specific_ctl = dummy_ip6_datagram_recv_ctl;
d862e546 LC	271	pingv6_ops.icmpv6_err_convert = dummy_icmpv6_err_convert;
	272	pingv6_ops.ipv6_icmp_error = dummy_ipv6_icmp_error;
	273	pingv6_ops.ipv6_chk_addr = dummy_ipv6_chk_addr;
	274	#ifdef CONFIG_PROC_FS
	275	unregister_pernet_subsys(&ping_v6_net_ops);
	276	#endif
	277	inet6_unregister_protosw(&pingv6_protosw);
	278	}