[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,
	.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,
	.no_check =  UDP_CSUM_DEFAULT,
	.flags =     INET_PROTOSW_REUSE,
};


/* Compatibility glue so we can support IPv6 when it's compiled as a module */
int dummy_ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len)
{
	return -EAFNOSUPPORT;
}
int dummy_ip6_datagram_recv_ctl(struct sock *sk, struct msghdr *msg,
				 struct sk_buff *skb)
{
	return -EAFNOSUPPORT;
}
int dummy_icmpv6_err_convert(u8 type, u8 code, int *err)
{
	return -EAFNOSUPPORT;
}
void dummy_ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
			    __be16 port, u32 info, u8 *payload) {}
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) {
		struct sockaddr_in6 *u = (struct sockaddr_in6 *) 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 = &np->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.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, 1);
	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.iov = msg->msg_iov;
	pfh.wcheck = 0;
	pfh.family = AF_INET6;

	if (ipv6_addr_is_multicast(&fl6.daddr))
		hlimit = np->mcast_hops;
	else
		hlimit = np->hop_limit;
	if (hlimit < 0)
		hlimit = ip6_dst_hoplimit(dst);

	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_BH(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);
	}

	return err;
}

#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);
}

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_ctl = ip6_datagram_recv_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_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,
	34	.connect = ip6_datagram_connect,
	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,
	54	.no_check = UDP_CSUM_DEFAULT,
	55	.flags = INET_PROTOSW_REUSE,
	56	};
	57
	58
	59	/* Compatibility glue so we can support IPv6 when it's compiled as a module */
	60	int dummy_ipv6_recv_error(struct sock sk, struct msghdr msg, int len)
	61	{
	62	return -EAFNOSUPPORT;
	63	}
	64	int dummy_ip6_datagram_recv_ctl(struct sock sk, struct msghdr msg,
65	struct sk_buff *skb)
66	{
67	return -EAFNOSUPPORT;
68	}
69	int dummy_icmpv6_err_convert(u8 type, u8 code, int *err)
70	{
71	return -EAFNOSUPPORT;
72	}
73	void dummy_ipv6_icmp_error(struct sock sk, struct sk_buff skb, int err,
74	__be16 port, u32 info, u8 *payload) {}
75	int dummy_ipv6_chk_addr(struct net net, const struct in6_addr addr,
6bc19fb8	76	const struct net_device *dev, int strict)
6d0bfe22 LC	77	{
	78	return 0;
	79	}
	80
6d0bfe22 LC	81	int ping_v6_sendmsg(struct kiocb iocb, struct sock sk, struct msghdr *msg,
	82	size_t len)
	83	{
	84	struct inet_sock *inet = inet_sk(sk);
	85	struct ipv6_pinfo *np = inet6_sk(sk);
	86	struct icmp6hdr user_icmph;
	87	int addr_type;
	88	struct in6_addr *daddr;
	89	int iif = 0;
	90	struct flowi6 fl6;
	91	int err;
	92	int hlimit;
	93	struct dst_entry *dst;
	94	struct rt6_info *rt;
	95	struct pingfakehdr pfh;
	96
	97	pr_debug("ping_v6_sendmsg(sk=%p,sk->num=%u)\n", inet, inet->inet_num);
	98
	99	err = ping_common_sendmsg(AF_INET6, msg, len, &user_icmph,
	100	sizeof(user_icmph));
	101	if (err)
	102	return err;
	103
	104	if (msg->msg_name) {
	105	struct sockaddr_in6 u = (struct sockaddr_in6 ) msg->msg_name;
	106	if (msg->msg_namelen < sizeof(struct sockaddr_in6) \|\|
	107	u->sin6_family != AF_INET6) {
	108	return -EINVAL;
	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;
	119	daddr = &np->daddr;
	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;
	138	fl6.fl6_icmp_type = user_icmph.icmp6_type;
	139	fl6.fl6_icmp_code = user_icmph.icmp6_code;
	140	security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
	141
	142	if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr))
	143	fl6.flowi6_oif = np->mcast_oif;
	144	else if (!fl6.flowi6_oif)
145	fl6.flowi6_oif = np->ucast_oif;
146
147	dst = ip6_sk_dst_lookup_flow(sk, &fl6, daddr, 1);
148	if (IS_ERR(dst))
149	return PTR_ERR(dst);
150	rt = (struct rt6_info *) dst;
151
152	np = inet6_sk(sk);
153	if (!np)
154	return -EBADF;
155
156	if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr))
157	fl6.flowi6_oif = np->mcast_oif;
158	else if (!fl6.flowi6_oif)
159	fl6.flowi6_oif = np->ucast_oif;
160
161	pfh.icmph.type = user_icmph.icmp6_type;
162	pfh.icmph.code = user_icmph.icmp6_code;
163	pfh.icmph.checksum = 0;
164	pfh.icmph.un.echo.id = inet->inet_sport;
165	pfh.icmph.un.echo.sequence = user_icmph.icmp6_sequence;
166	pfh.iov = msg->msg_iov;
167	pfh.wcheck = 0;
168	pfh.family = AF_INET6;
169
170	if (ipv6_addr_is_multicast(&fl6.daddr))
171	hlimit = np->mcast_hops;
172	else
173	hlimit = np->hop_limit;
174	if (hlimit < 0)
175	hlimit = ip6_dst_hoplimit(dst);
176
177	err = ip6_append_data(sk, ping_getfrag, &pfh, len,
178	0, hlimit,
179	np->tclass, NULL, &fl6, rt,
180	MSG_DONTWAIT, np->dontfrag);
181
182	if (err) {
183	ICMP6_INC_STATS_BH(sock_net(sk), rt->rt6i_idev,
184	ICMP6_MIB_OUTERRORS);
185	ip6_flush_pending_frames(sk);
186	} else {
187	err = icmpv6_push_pending_frames(sk, &fl6,
188	(struct icmp6hdr *) &pfh.icmph,
189	len);
190	}
191
192	return err;
193	}
d862e546 LC	194
	195	#ifdef CONFIG_PROC_FS
	196	static void ping_v6_seq_start(struct seq_file seq, loff_t *pos)
	197	{
	198	return ping_seq_start(seq, pos, AF_INET6);
	199	}
	200
	201	int ping_v6_seq_show(struct seq_file seq, void v)
	202	{
	203	if (v == SEQ_START_TOKEN) {
	204	seq_puts(seq, IPV6_SEQ_DGRAM_HEADER);
	205	} else {
	206	int bucket = ((struct ping_iter_state *) seq->private)->bucket;
	207	struct inet_sock *inet = inet_sk(v);
	208	__u16 srcp = ntohs(inet->inet_sport);
	209	__u16 destp = ntohs(inet->inet_dport);
	210	ip6_dgram_sock_seq_show(seq, v, srcp, destp, bucket);
	211	}
	212	return 0;
	213	}
	214
	215	static struct ping_seq_afinfo ping_v6_seq_afinfo = {
	216	.name = "icmp6",
	217	.family = AF_INET6,
	218	.seq_fops = &ping_seq_fops,
	219	.seq_ops = {
	220	.start = ping_v6_seq_start,
	221	.show = ping_v6_seq_show,
	222	.next = ping_seq_next,
	223	.stop = ping_seq_stop,
	224	},
	225	};
	226
	227	static int __net_init ping_v6_proc_init_net(struct net *net)
	228	{
	229	return ping_proc_register(net, &ping_v6_seq_afinfo);
	230	}
	231
	232	static void __net_init ping_v6_proc_exit_net(struct net *net)
	233	{
	234	return ping_proc_unregister(net, &ping_v6_seq_afinfo);
	235	}
	236
	237	static struct pernet_operations ping_v6_net_ops = {
	238	.init = ping_v6_proc_init_net,
	239	.exit = ping_v6_proc_exit_net,
	240	};
	241	#endif
	242
	243	int __init pingv6_init(void)
	244	{
	245	#ifdef CONFIG_PROC_FS
	246	int ret = register_pernet_subsys(&ping_v6_net_ops);
	247	if (ret)
	248	return ret;
	249	#endif
	250	pingv6_ops.ipv6_recv_error = ipv6_recv_error;
	251	pingv6_ops.ip6_datagram_recv_ctl = ip6_datagram_recv_ctl;
	252	pingv6_ops.icmpv6_err_convert = icmpv6_err_convert;
	253	pingv6_ops.ipv6_icmp_error = ipv6_icmp_error;
	254	pingv6_ops.ipv6_chk_addr = ipv6_chk_addr;
	255	return inet6_register_protosw(&pingv6_protosw);
	256	}
	257
258	/* This never gets called because it's not possible to unload the ipv6 module,
259	* but just in case.
260	*/
261	void pingv6_exit(void)
262	{
263	pingv6_ops.ipv6_recv_error = dummy_ipv6_recv_error;
264	pingv6_ops.ip6_datagram_recv_ctl = dummy_ip6_datagram_recv_ctl;
265	pingv6_ops.icmpv6_err_convert = dummy_icmpv6_err_convert;
266	pingv6_ops.ipv6_icmp_error = dummy_ipv6_icmp_error;
267	pingv6_ops.ipv6_chk_addr = dummy_ipv6_chk_addr;
268	#ifdef CONFIG_PROC_FS
269	unregister_pernet_subsys(&ping_v6_net_ops);
270	#endif
271	inet6_unregister_protosw(&pingv6_protosw);
272	}