/* * 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_FSstatic 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);}