[mirror_ubuntu-artful-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 kiocb *iocb, 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(*u))
			return -EINVAL;
		if (u->sin6_family != AF_INET6) {
			return -EAFNOSUPPORT;
		}
		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
6d0bfe22 LC	80	int ping_v6_sendmsg(struct kiocb iocb, struct sock sk, struct msghdr *msg,
	81	size_t len)
	82	{
	83	struct inet_sock *inet = inet_sk(sk);
	84	struct ipv6_pinfo *np = inet6_sk(sk);
	85	struct icmp6hdr user_icmph;
	86	int addr_type;
	87	struct in6_addr *daddr;
	88	int iif = 0;
	89	struct flowi6 fl6;
	90	int err;
	91	int hlimit;
	92	struct dst_entry *dst;
	93	struct rt6_info *rt;
	94	struct pingfakehdr pfh;
	95
	96	pr_debug("ping_v6_sendmsg(sk=%p,sk->num=%u)\n", inet, inet->inet_num);
	97
	98	err = ping_common_sendmsg(AF_INET6, msg, len, &user_icmph,
	99	sizeof(user_icmph));
	100	if (err)
	101	return err;
	102
	103	if (msg->msg_name) {
342dfc30	104	DECLARE_SOCKADDR(struct sockaddr_in6 *, u, msg->msg_name);
9145736d	105	if (msg->msg_namelen < sizeof(*u))
6d0bfe22	106	return -EINVAL;
9145736d LC	107	if (u->sin6_family != AF_INET6) {
9145736d LC	108	return -EAFNOSUPPORT;
6d0bfe22 LC	109	}
	110	if (sk->sk_bound_dev_if &&
	111	sk->sk_bound_dev_if != u->sin6_scope_id) {
	112	return -EINVAL;
	113	}
	114	daddr = &(u->sin6_addr);
	115	iif = u->sin6_scope_id;
	116	} else {
	117	if (sk->sk_state != TCP_ESTABLISHED)
	118	return -EDESTADDRREQ;
efe4208f	119	daddr = &sk->sk_v6_daddr;
6d0bfe22 LC	120	}
	121
	122	if (!iif)
	123	iif = sk->sk_bound_dev_if;
	124
	125	addr_type = ipv6_addr_type(daddr);
	126	if (__ipv6_addr_needs_scope_id(addr_type) && !iif)
	127	return -EINVAL;
	128	if (addr_type & IPV6_ADDR_MAPPED)
	129	return -EINVAL;
	130
	131	/* TODO: use ip6_datagram_send_ctl to get options from cmsg */
	132
	133	memset(&fl6, 0, sizeof(fl6));
	134
	135	fl6.flowi6_proto = IPPROTO_ICMPV6;
	136	fl6.saddr = np->saddr;
	137	fl6.daddr = *daddr;
bf439b31	138	fl6.flowi6_mark = sk->sk_mark;
6d0bfe22 LC	139	fl6.fl6_icmp_type = user_icmph.icmp6_type;
	140	fl6.fl6_icmp_code = user_icmph.icmp6_code;
	141	security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
	142
	143	if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr))
	144	fl6.flowi6_oif = np->mcast_oif;
	145	else if (!fl6.flowi6_oif)
	146	fl6.flowi6_oif = np->ucast_oif;
	147
0e0d44ab	148	dst = ip6_sk_dst_lookup_flow(sk, &fl6, daddr);
6d0bfe22 LC	149	if (IS_ERR(dst))
	150	return PTR_ERR(dst);
	151	rt = (struct rt6_info *) dst;
	152
	153	np = inet6_sk(sk);
	154	if (!np)
	155	return -EBADF;
	156
	157	if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr))
	158	fl6.flowi6_oif = np->mcast_oif;
	159	else if (!fl6.flowi6_oif)
	160	fl6.flowi6_oif = np->ucast_oif;
	161
	162	pfh.icmph.type = user_icmph.icmp6_type;
	163	pfh.icmph.code = user_icmph.icmp6_code;
	164	pfh.icmph.checksum = 0;
	165	pfh.icmph.un.echo.id = inet->inet_sport;
	166	pfh.icmph.un.echo.sequence = user_icmph.icmp6_sequence;
cacdc7d2	167	pfh.msg = msg;
6d0bfe22 LC	168	pfh.wcheck = 0;
	169	pfh.family = AF_INET6;
	170
5c98631c	171	hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst);
6d0bfe22	172
a1bdc455	173	lock_sock(sk);
6d0bfe22 LC	174	err = ip6_append_data(sk, ping_getfrag, &pfh, len,
	175	0, hlimit,
	176	np->tclass, NULL, &fl6, rt,
	177	MSG_DONTWAIT, np->dontfrag);
	178
	179	if (err) {
43a43b60 HFS	180	ICMP6_INC_STATS(sock_net(sk), rt->rt6i_idev,
43a43b60 HFS	181	ICMP6_MIB_OUTERRORS);
6d0bfe22 LC	182	ip6_flush_pending_frames(sk);
	183	} else {
	184	err = icmpv6_push_pending_frames(sk, &fl6,
	185	(struct icmp6hdr *) &pfh.icmph,
	186	len);
	187	}
a1bdc455	188	release_sock(sk);
6d0bfe22	189
fbfe80c8 LC	190	if (err)
	191	return err;
	192
	193	return len;
6d0bfe22	194	}
d862e546 LC	195
	196	#ifdef CONFIG_PROC_FS
	197	static void ping_v6_seq_start(struct seq_file seq, loff_t *pos)
	198	{
	199	return ping_seq_start(seq, pos, AF_INET6);
	200	}
	201
a06a2d37	202	static int ping_v6_seq_show(struct seq_file seq, void v)
d862e546 LC	203	{
	204	if (v == SEQ_START_TOKEN) {
	205	seq_puts(seq, IPV6_SEQ_DGRAM_HEADER);
	206	} else {
	207	int bucket = ((struct ping_iter_state *) seq->private)->bucket;
	208	struct inet_sock *inet = inet_sk(v);
	209	__u16 srcp = ntohs(inet->inet_sport);
	210	__u16 destp = ntohs(inet->inet_dport);
	211	ip6_dgram_sock_seq_show(seq, v, srcp, destp, bucket);
	212	}
	213	return 0;
	214	}
	215
	216	static struct ping_seq_afinfo ping_v6_seq_afinfo = {
	217	.name = "icmp6",
	218	.family = AF_INET6,
	219	.seq_fops = &ping_seq_fops,
	220	.seq_ops = {
	221	.start = ping_v6_seq_start,
	222	.show = ping_v6_seq_show,
	223	.next = ping_seq_next,
	224	.stop = ping_seq_stop,
	225	},
	226	};
	227
	228	static int __net_init ping_v6_proc_init_net(struct net *net)
	229	{
	230	return ping_proc_register(net, &ping_v6_seq_afinfo);
	231	}
	232
	233	static void __net_init ping_v6_proc_exit_net(struct net *net)
	234	{
	235	return ping_proc_unregister(net, &ping_v6_seq_afinfo);
	236	}
	237
	238	static struct pernet_operations ping_v6_net_ops = {
	239	.init = ping_v6_proc_init_net,
	240	.exit = ping_v6_proc_exit_net,
	241	};
	242	#endif
	243
	244	int __init pingv6_init(void)
	245	{
	246	#ifdef CONFIG_PROC_FS
	247	int ret = register_pernet_subsys(&ping_v6_net_ops);
	248	if (ret)
	249	return ret;
	250	#endif
	251	pingv6_ops.ipv6_recv_error = ipv6_recv_error;
4b261c75 HFS	252	pingv6_ops.ip6_datagram_recv_common_ctl = ip6_datagram_recv_common_ctl;
	253	pingv6_ops.ip6_datagram_recv_specific_ctl =
	254	ip6_datagram_recv_specific_ctl;
d862e546 LC	255	pingv6_ops.icmpv6_err_convert = icmpv6_err_convert;
	256	pingv6_ops.ipv6_icmp_error = ipv6_icmp_error;
	257	pingv6_ops.ipv6_chk_addr = ipv6_chk_addr;
	258	return inet6_register_protosw(&pingv6_protosw);
	259	}
	260
	261	/* This never gets called because it's not possible to unload the ipv6 module,
	262	* but just in case.
	263	*/
	264	void pingv6_exit(void)
	265	{
	266	pingv6_ops.ipv6_recv_error = dummy_ipv6_recv_error;
4b261c75 HFS	267	pingv6_ops.ip6_datagram_recv_common_ctl = dummy_ip6_datagram_recv_ctl;
4b261c75 HFS	268	pingv6_ops.ip6_datagram_recv_specific_ctl = dummy_ip6_datagram_recv_ctl;
d862e546 LC	269	pingv6_ops.icmpv6_err_convert = dummy_icmpv6_err_convert;
	270	pingv6_ops.ipv6_icmp_error = dummy_ipv6_icmp_error;
	271	pingv6_ops.ipv6_chk_addr = dummy_ipv6_chk_addr;
	272	#ifdef CONFIG_PROC_FS
	273	unregister_pernet_subsys(&ping_v6_net_ops);
	274	#endif
	275	inet6_unregister_protosw(&pingv6_protosw);
	276	}