net/ipv6/ping.c - maze/linux - Git at Google

 /*
  * 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 */
 static int dummy_ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len,
 				 int *addr_len)
 {
 	return -EAFNOSUPPORT;
 }
 static int dummy_ip6_datagram_recv_ctl(struct sock *sk, struct msghdr *msg,
 				       struct sk_buff *skb)
 {
 	return -EAFNOSUPPORT;
 }
 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) {
 		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 = &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.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);

 	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_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);
 	}
 	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_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);
 }
	/*
	* 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 */
	static int dummy_ipv6_recv_error(struct sock sk, struct msghdr msg, int len,
	int *addr_len)
	{
	return -EAFNOSUPPORT;
	}
	static int dummy_ip6_datagram_recv_ctl(struct sock sk, struct msghdr msg,
	struct sk_buff *skb)
	{
	return -EAFNOSUPPORT;
	}
	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) {
	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 = &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.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);

	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_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);
	}
	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_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);
	}