diff --git a/net/ipv4/ping.c b/net/ipv4/ping.c
new file mode 100644
index 0000000..a77e2d7
--- /dev/null
+++ b/net/ipv4/ping.c
@@ -0,0 +1,937 @@
+/*
+ * 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/udp.c code.
+ *
+ * Authors:	Vasiliy Kulikov / Openwall (for Linux 2.6),
+ *		Pavel Kankovsky (for Linux 2.4.32)
+ *
+ * Pavel gave all rights to bugs to Vasiliy,
+ * none of the bugs are Pavel's now.
+ *
+ */
+
+#include <asm/system.h>
+#include <linux/uaccess.h>
+#include <asm/ioctls.h>
+#include <linux/types.h>
+#include <linux/fcntl.h>
+#include <linux/socket.h>
+#include <linux/sockios.h>
+#include <linux/in.h>
+#include <linux/errno.h>
+#include <linux/timer.h>
+#include <linux/mm.h>
+#include <linux/inet.h>
+#include <linux/netdevice.h>
+#include <net/snmp.h>
+#include <net/ip.h>
+#include <net/ipv6.h>
+#include <net/icmp.h>
+#include <net/protocol.h>
+#include <linux/skbuff.h>
+#include <linux/proc_fs.h>
+#include <net/sock.h>
+#include <net/ping.h>
+#include <net/icmp.h>
+#include <net/udp.h>
+#include <net/route.h>
+#include <net/inet_common.h>
+#include <net/checksum.h>
+
+
+struct ping_table ping_table __read_mostly;
+
+u16 ping_port_rover;
+
+static inline int ping_hashfn(struct net *net, unsigned num, unsigned mask)
+{
+	int res = (num + net_hash_mix(net)) & mask;
+	pr_debug("hash(%d) = %d\n", num, res);
+	return res;
+}
+
+static inline struct hlist_nulls_head *ping_hashslot(struct ping_table *table,
+					     struct net *net, unsigned num)
+{
+	return &table->hash[ping_hashfn(net, num, PING_HTABLE_MASK)];
+}
+
+static int ping_v4_get_port(struct sock *sk, unsigned short ident)
+{
+	struct hlist_nulls_node *node;
+	struct hlist_nulls_head *hlist;
+	struct inet_sock *isk, *isk2;
+	struct sock *sk2 = NULL;
+
+	isk = inet_sk(sk);
+	write_lock_bh(&ping_table.lock);
+	if (ident == 0) {
+		u32 i;
+		u16 result = ping_port_rover + 1;
+
+		for (i = 0; i < (1L << 16); i++, result++) {
+			if (!result)
+				result++; /* avoid zero */
+			hlist = ping_hashslot(&ping_table, sock_net(sk),
+					    result);
+			ping_portaddr_for_each_entry(sk2, node, hlist) {
+				isk2 = inet_sk(sk2);
+
+				if (isk2->inet_num == result)
+					goto next_port;
+			}
+
+			/* found */
+			ping_port_rover = ident = result;
+			break;
+next_port:
+			;
+		}
+		if (i >= (1L << 16))
+			goto fail;
+	} else {
+		hlist = ping_hashslot(&ping_table, sock_net(sk), ident);
+		ping_portaddr_for_each_entry(sk2, node, hlist) {
+			isk2 = inet_sk(sk2);
+
+			if ((isk2->inet_num == ident) &&
+			    (sk2 != sk) &&
+			    (!sk2->sk_reuse || !sk->sk_reuse))
+				goto fail;
+		}
+	}
+
+	pr_debug("found port/ident = %d\n", ident);
+	isk->inet_num = ident;
+	if (sk_unhashed(sk)) {
+		pr_debug("was not hashed\n");
+		sock_hold(sk);
+		hlist_nulls_add_head(&sk->sk_nulls_node, hlist);
+		sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
+	}
+	write_unlock_bh(&ping_table.lock);
+	return 0;
+
+fail:
+	write_unlock_bh(&ping_table.lock);
+	return 1;
+}
+
+static void ping_v4_hash(struct sock *sk)
+{
+	pr_debug("ping_v4_hash(sk->port=%u)\n", inet_sk(sk)->inet_num);
+	BUG(); /* "Please do not press this button again." */
+}
+
+static void ping_v4_unhash(struct sock *sk)
+{
+	struct inet_sock *isk = inet_sk(sk);
+	pr_debug("ping_v4_unhash(isk=%p,isk->num=%u)\n", isk, isk->inet_num);
+	if (sk_hashed(sk)) {
+		struct hlist_nulls_head *hslot;
+
+		hslot = ping_hashslot(&ping_table, sock_net(sk), isk->inet_num);
+		write_lock_bh(&ping_table.lock);
+		hlist_nulls_del(&sk->sk_nulls_node);
+		sock_put(sk);
+		isk->inet_num = isk->inet_sport = 0;
+		sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
+		write_unlock_bh(&ping_table.lock);
+	}
+}
+
+struct sock *ping_v4_lookup(struct net *net, u32 saddr, u32 daddr,
+	 u16 ident, int dif)
+{
+	struct hlist_nulls_head *hslot = ping_hashslot(&ping_table, net, ident);
+	struct sock *sk = NULL;
+	struct inet_sock *isk;
+	struct hlist_nulls_node *hnode;
+
+	pr_debug("try to find: num = %d, daddr = %ld, dif = %d\n",
+			 (int)ident, (unsigned long)daddr, dif);
+	read_lock_bh(&ping_table.lock);
+
+	ping_portaddr_for_each_entry(sk, hnode, hslot) {
+		isk = inet_sk(sk);
+
+		pr_debug("found: %p: num = %d, daddr = %ld, dif = %d\n", sk,
+			 (int)isk->inet_num, (unsigned long)isk->inet_rcv_saddr,
+			 sk->sk_bound_dev_if);
+
+		pr_debug("iterate\n");
+		if (isk->inet_num != ident)
+			continue;
+		if (isk->inet_rcv_saddr && isk->inet_rcv_saddr != daddr)
+			continue;
+		if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif)
+			continue;
+
+		sock_hold(sk);
+		goto exit;
+	}
+
+	sk = NULL;
+exit:
+	read_unlock_bh(&ping_table.lock);
+
+	return sk;
+}
+
+static int ping_init_sock(struct sock *sk)
+{
+	struct net *net = sock_net(sk);
+	gid_t group = current_egid();
+	gid_t range[2];
+	struct group_info *group_info = get_current_groups();
+	int i, j, count = group_info->ngroups;
+
+	inet_get_ping_group_range_net(net, range, range+1);
+	if (range[0] <= group && group <= range[1])
+		return 0;
+
+	for (i = 0; i < group_info->nblocks; i++) {
+		int cp_count = min_t(int, NGROUPS_PER_BLOCK, count);
+
+		for (j = 0; j < cp_count; j++) {
+			group = group_info->blocks[i][j];
+			if (range[0] <= group && group <= range[1])
+				return 0;
+		}
+
+		count -= cp_count;
+	}
+
+	return -EACCES;
+}
+
+static void ping_close(struct sock *sk, long timeout)
+{
+	pr_debug("ping_close(sk=%p,sk->num=%u)\n",
+		inet_sk(sk), inet_sk(sk)->inet_num);
+	pr_debug("isk->refcnt = %d\n", sk->sk_refcnt.counter);
+
+	sk_common_release(sk);
+}
+
+/*
+ * We need our own bind because there are no privileged id's == local ports.
+ * Moreover, we don't allow binding to multi- and broadcast addresses.
+ */
+
+static int ping_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
+{
+	struct sockaddr_in *addr = (struct sockaddr_in *)uaddr;
+	struct inet_sock *isk = inet_sk(sk);
+	unsigned short snum;
+	int chk_addr_ret;
+	int err;
+
+	if (addr_len < sizeof(struct sockaddr_in))
+		return -EINVAL;
+
+	pr_debug("ping_v4_bind(sk=%p,sa_addr=%08x,sa_port=%d)\n",
+		sk, addr->sin_addr.s_addr, ntohs(addr->sin_port));
+
+	chk_addr_ret = inet_addr_type(sock_net(sk), addr->sin_addr.s_addr);
+	if (addr->sin_addr.s_addr == INADDR_ANY)
+		chk_addr_ret = RTN_LOCAL;
+
+	if ((sysctl_ip_nonlocal_bind == 0 &&
+	    isk->freebind == 0 && isk->transparent == 0 &&
+	     chk_addr_ret != RTN_LOCAL) ||
+	    chk_addr_ret == RTN_MULTICAST ||
+	    chk_addr_ret == RTN_BROADCAST)
+		return -EADDRNOTAVAIL;
+
+	lock_sock(sk);
+
+	err = -EINVAL;
+	if (isk->inet_num != 0)
+		goto out;
+
+	err = -EADDRINUSE;
+	isk->inet_rcv_saddr = isk->inet_saddr = addr->sin_addr.s_addr;
+	snum = ntohs(addr->sin_port);
+	if (ping_v4_get_port(sk, snum) != 0) {
+		isk->inet_saddr = isk->inet_rcv_saddr = 0;
+		goto out;
+	}
+
+	pr_debug("after bind(): num = %d, daddr = %ld, dif = %d\n",
+		(int)isk->inet_num,
+		(unsigned long) isk->inet_rcv_saddr,
+		(int)sk->sk_bound_dev_if);
+
+	err = 0;
+	if (isk->inet_rcv_saddr)
+		sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
+	if (snum)
+		sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
+	isk->inet_sport = htons(isk->inet_num);
+	isk->inet_daddr = 0;
+	isk->inet_dport = 0;
+	sk_dst_reset(sk);
+out:
+	release_sock(sk);
+	pr_debug("ping_v4_bind -> %d\n", err);
+	return err;
+}
+
+/*
+ * Is this a supported type of ICMP message?
+ */
+
+static inline int ping_supported(int type, int code)
+{
+	if (type == ICMP_ECHO && code == 0)
+		return 1;
+	return 0;
+}
+
+/*
+ * This routine is called by the ICMP module when it gets some
+ * sort of error condition.
+ */
+
+static int ping_queue_rcv_skb(struct sock *sk, struct sk_buff *skb);
+
+void ping_err(struct sk_buff *skb, u32 info)
+{
+	struct iphdr *iph = (struct iphdr *)skb->data;
+	struct icmphdr *icmph = (struct icmphdr *)(skb->data+(iph->ihl<<2));
+	struct inet_sock *inet_sock;
+	int type = icmph->type;
+	int code = icmph->code;
+	struct net *net = dev_net(skb->dev);
+	struct sock *sk;
+	int harderr;
+	int err;
+
+	/* We assume the packet has already been checked by icmp_unreach */
+
+	if (!ping_supported(icmph->type, icmph->code))
+		return;
+
+	pr_debug("ping_err(type=%04x,code=%04x,id=%04x,seq=%04x)\n", type,
+		code, ntohs(icmph->un.echo.id), ntohs(icmph->un.echo.sequence));
+
+	sk = ping_v4_lookup(net, iph->daddr, iph->saddr,
+			    ntohs(icmph->un.echo.id), skb->dev->ifindex);
+	if (sk == NULL) {
+		ICMP_INC_STATS_BH(net, ICMP_MIB_INERRORS);
+		pr_debug("no socket, dropping\n");
+		return;	/* No socket for error */
+	}
+	pr_debug("err on socket %p\n", sk);
+
+	err = 0;
+	harderr = 0;
+	inet_sock = inet_sk(sk);
+
+	switch (type) {
+	default:
+	case ICMP_TIME_EXCEEDED:
+		err = EHOSTUNREACH;
+		break;
+	case ICMP_SOURCE_QUENCH:
+		/* This is not a real error but ping wants to see it.
+		 * Report it with some fake errno. */
+		err = EREMOTEIO;
+		break;
+	case ICMP_PARAMETERPROB:
+		err = EPROTO;
+		harderr = 1;
+		break;
+	case ICMP_DEST_UNREACH:
+		if (code == ICMP_FRAG_NEEDED) { /* Path MTU discovery */
+			if (inet_sock->pmtudisc != IP_PMTUDISC_DONT) {
+				err = EMSGSIZE;
+				harderr = 1;
+				break;
+			}
+			goto out;
+		}
+		err = EHOSTUNREACH;
+		if (code <= NR_ICMP_UNREACH) {
+			harderr = icmp_err_convert[code].fatal;
+			err = icmp_err_convert[code].errno;
+		}
+		break;
+	case ICMP_REDIRECT:
+		/* See ICMP_SOURCE_QUENCH */
+		err = EREMOTEIO;
+		break;
+	}
+
+	/*
+	 *      RFC1122: OK.  Passes ICMP errors back to application, as per
+	 *	4.1.3.3.
+	 */
+	if (!inet_sock->recverr) {
+		if (!harderr || sk->sk_state != TCP_ESTABLISHED)
+			goto out;
+	} else {
+		ip_icmp_error(sk, skb, err, 0 /* no remote port */,
+			 info, (u8 *)icmph);
+	}
+	sk->sk_err = err;
+	sk->sk_error_report(sk);
+out:
+	sock_put(sk);
+}
+
+/*
+ *	Copy and checksum an ICMP Echo packet from user space into a buffer.
+ */
+
+struct pingfakehdr {
+	struct icmphdr icmph;
+	struct iovec *iov;
+	u32 wcheck;
+};
+
+static int ping_getfrag(void *from, char * to,
+			int offset, int fraglen, int odd, struct sk_buff *skb)
+{
+	struct pingfakehdr *pfh = (struct pingfakehdr *)from;
+
+	if (offset == 0) {
+		if (fraglen < sizeof(struct icmphdr))
+			BUG();
+		if (csum_partial_copy_fromiovecend(to + sizeof(struct icmphdr),
+			    pfh->iov, 0, fraglen - sizeof(struct icmphdr),
+			    &pfh->wcheck))
+			return -EFAULT;
+
+		return 0;
+	}
+	if (offset < sizeof(struct icmphdr))
+		BUG();
+	if (csum_partial_copy_fromiovecend
+			(to, pfh->iov, offset - sizeof(struct icmphdr),
+			 fraglen, &pfh->wcheck))
+		return -EFAULT;
+	return 0;
+}
+
+static int ping_push_pending_frames(struct sock *sk, struct pingfakehdr *pfh, struct flowi4 *fl4)
+{
+	struct sk_buff *skb = skb_peek(&sk->sk_write_queue);
+
+	pfh->wcheck = csum_partial((char *)&pfh->icmph,
+		sizeof(struct icmphdr), pfh->wcheck);
+	pfh->icmph.checksum = csum_fold(pfh->wcheck);
+	memcpy(icmp_hdr(skb), &pfh->icmph, sizeof(struct icmphdr));
+	skb->ip_summed = CHECKSUM_NONE;
+	return ip_push_pending_frames(sk, fl4);
+}
+
+int ping_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
+		 size_t len)
+{
+	struct net *net = sock_net(sk);
+	struct flowi4 fl4;
+	struct inet_sock *inet = inet_sk(sk);
+	struct ipcm_cookie ipc;
+	struct icmphdr user_icmph;
+	struct pingfakehdr pfh;
+	struct rtable *rt = NULL;
+	struct ip_options_data opt_copy;
+	int free = 0;
+	u32 saddr, daddr, faddr;
+	u8  tos;
+	int err;
+
+	pr_debug("ping_sendmsg(sk=%p,sk->num=%u)\n", inet, inet->inet_num);
+
+
+	if (len > 0xFFFF)
+		return -EMSGSIZE;
+
+	/*
+	 *	Check the flags.
+	 */
+
+	/* Mirror BSD error message compatibility */
+	if (msg->msg_flags & MSG_OOB)
+		return -EOPNOTSUPP;
+
+	/*
+	 *	Fetch the ICMP header provided by the userland.
+	 *	iovec is modified!
+	 */
+
+	if (memcpy_fromiovec((u8 *)&user_icmph, msg->msg_iov,
+			     sizeof(struct icmphdr)))
+		return -EFAULT;
+	if (!ping_supported(user_icmph.type, user_icmph.code))
+		return -EINVAL;
+
+	/*
+	 *	Get and verify the address.
+	 */
+
+	if (msg->msg_name) {
+		struct sockaddr_in *usin = (struct sockaddr_in *)msg->msg_name;
+		if (msg->msg_namelen < sizeof(*usin))
+			return -EINVAL;
+		if (usin->sin_family != AF_INET)
+			return -EINVAL;
+		daddr = usin->sin_addr.s_addr;
+		/* no remote port */
+	} else {
+		if (sk->sk_state != TCP_ESTABLISHED)
+			return -EDESTADDRREQ;
+		daddr = inet->inet_daddr;
+		/* no remote port */
+	}
+
+	ipc.addr = inet->inet_saddr;
+	ipc.opt = NULL;
+	ipc.oif = sk->sk_bound_dev_if;
+	ipc.tx_flags = 0;
+	err = sock_tx_timestamp(sk, &ipc.tx_flags);
+	if (err)
+		return err;
+
+	if (msg->msg_controllen) {
+		err = ip_cmsg_send(sock_net(sk), msg, &ipc);
+		if (err)
+			return err;
+		if (ipc.opt)
+			free = 1;
+	}
+	if (!ipc.opt) {
+		struct ip_options_rcu *inet_opt;
+
+		rcu_read_lock();
+		inet_opt = rcu_dereference(inet->inet_opt);
+		if (inet_opt) {
+			memcpy(&opt_copy, inet_opt,
+			       sizeof(*inet_opt) + inet_opt->opt.optlen);
+			ipc.opt = &opt_copy.opt;
+		}
+		rcu_read_unlock();
+	}
+
+	saddr = ipc.addr;
+	ipc.addr = faddr = daddr;
+
+	if (ipc.opt && ipc.opt->opt.srr) {
+		if (!daddr)
+			return -EINVAL;
+		faddr = ipc.opt->opt.faddr;
+	}
+	tos = RT_TOS(inet->tos);
+	if (sock_flag(sk, SOCK_LOCALROUTE) ||
+	    (msg->msg_flags & MSG_DONTROUTE) ||
+	    (ipc.opt && ipc.opt->opt.is_strictroute)) {
+		tos |= RTO_ONLINK;
+	}
+
+	if (ipv4_is_multicast(daddr)) {
+		if (!ipc.oif)
+			ipc.oif = inet->mc_index;
+		if (!saddr)
+			saddr = inet->mc_addr;
+	}
+
+	flowi4_init_output(&fl4, ipc.oif, sk->sk_mark, tos,
+			   RT_SCOPE_UNIVERSE, sk->sk_protocol,
+			   inet_sk_flowi_flags(sk), faddr, saddr, 0, 0);
+
+	security_sk_classify_flow(sk, flowi4_to_flowi(&fl4));
+	rt = ip_route_output_flow(net, &fl4, sk);
+	if (IS_ERR(rt)) {
+		err = PTR_ERR(rt);
+		rt = NULL;
+		if (err == -ENETUNREACH)
+			IP_INC_STATS_BH(net, IPSTATS_MIB_OUTNOROUTES);
+		goto out;
+	}
+
+	err = -EACCES;
+	if ((rt->rt_flags & RTCF_BROADCAST) &&
+	    !sock_flag(sk, SOCK_BROADCAST))
+		goto out;
+
+	if (msg->msg_flags & MSG_CONFIRM)
+		goto do_confirm;
+back_from_confirm:
+
+	if (!ipc.addr)
+		ipc.addr = fl4.daddr;
+
+	lock_sock(sk);
+
+	pfh.icmph.type = user_icmph.type; /* already checked */
+	pfh.icmph.code = user_icmph.code; /* ditto */
+	pfh.icmph.checksum = 0;
+	pfh.icmph.un.echo.id = inet->inet_sport;
+	pfh.icmph.un.echo.sequence = user_icmph.un.echo.sequence;
+	pfh.iov = msg->msg_iov;
+	pfh.wcheck = 0;
+
+	err = ip_append_data(sk, &fl4, ping_getfrag, &pfh, len,
+			0, &ipc, &rt, msg->msg_flags);
+	if (err)
+		ip_flush_pending_frames(sk);
+	else
+		err = ping_push_pending_frames(sk, &pfh, &fl4);
+	release_sock(sk);
+
+out:
+	ip_rt_put(rt);
+	if (free)
+		kfree(ipc.opt);
+	if (!err) {
+		icmp_out_count(sock_net(sk), user_icmph.type);
+		return len;
+	}
+	return err;
+
+do_confirm:
+	dst_confirm(&rt->dst);
+	if (!(msg->msg_flags & MSG_PROBE) || len)
+		goto back_from_confirm;
+	err = 0;
+	goto out;
+}
+
+/*
+ *	IOCTL requests applicable to the UDP^H^H^HICMP protocol
+ */
+
+int ping_ioctl(struct sock *sk, int cmd, unsigned long arg)
+{
+	pr_debug("ping_ioctl(sk=%p,sk->num=%u,cmd=%d,arg=%lu)\n",
+		inet_sk(sk), inet_sk(sk)->inet_num, cmd, arg);
+	switch (cmd) {
+	case SIOCOUTQ:
+	case SIOCINQ:
+		return udp_ioctl(sk, cmd, arg);
+	default:
+		return -ENOIOCTLCMD;
+	}
+}
+
+int ping_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
+		 size_t len, int noblock, int flags, int *addr_len)
+{
+	struct inet_sock *isk = inet_sk(sk);
+	struct sockaddr_in *sin = (struct sockaddr_in *)msg->msg_name;
+	struct sk_buff *skb;
+	int copied, err;
+
+	pr_debug("ping_recvmsg(sk=%p,sk->num=%u)\n", isk, isk->inet_num);
+
+	if (flags & MSG_OOB)
+		goto out;
+
+	if (addr_len)
+		*addr_len = sizeof(*sin);
+
+	if (flags & MSG_ERRQUEUE)
+		return ip_recv_error(sk, msg, len);
+
+	skb = skb_recv_datagram(sk, flags, noblock, &err);
+	if (!skb)
+		goto out;
+
+	copied = skb->len;
+	if (copied > len) {
+		msg->msg_flags |= MSG_TRUNC;
+		copied = len;
+	}
+
+	/* Don't bother checking the checksum */
+	err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
+	if (err)
+		goto done;
+
+	sock_recv_timestamp(msg, sk, skb);
+
+	/* Copy the address. */
+	if (sin) {
+		sin->sin_family = AF_INET;
+		sin->sin_port = 0 /* skb->h.uh->source */;
+		sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
+		memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
+	}
+	if (isk->cmsg_flags)
+		ip_cmsg_recv(msg, skb);
+	err = copied;
+
+done:
+	skb_free_datagram(sk, skb);
+out:
+	pr_debug("ping_recvmsg -> %d\n", err);
+	return err;
+}
+
+static int ping_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
+{
+	pr_debug("ping_queue_rcv_skb(sk=%p,sk->num=%d,skb=%p)\n",
+		inet_sk(sk), inet_sk(sk)->inet_num, skb);
+	if (sock_queue_rcv_skb(sk, skb) < 0) {
+		ICMP_INC_STATS_BH(sock_net(sk), ICMP_MIB_INERRORS);
+		kfree_skb(skb);
+		pr_debug("ping_queue_rcv_skb -> failed\n");
+		return -1;
+	}
+	return 0;
+}
+
+
+/*
+ *	All we need to do is get the socket.
+ */
+
+void ping_rcv(struct sk_buff *skb)
+{
+	struct sock *sk;
+	struct net *net = dev_net(skb->dev);
+	struct iphdr *iph = ip_hdr(skb);
+	struct icmphdr *icmph = icmp_hdr(skb);
+	u32 saddr = iph->saddr;
+	u32 daddr = iph->daddr;
+
+	/* We assume the packet has already been checked by icmp_rcv */
+
+	pr_debug("ping_rcv(skb=%p,id=%04x,seq=%04x)\n",
+		skb, ntohs(icmph->un.echo.id), ntohs(icmph->un.echo.sequence));
+
+	/* Push ICMP header back */
+	skb_push(skb, skb->data - (u8 *)icmph);
+
+	sk = ping_v4_lookup(net, saddr, daddr, ntohs(icmph->un.echo.id),
+			    skb->dev->ifindex);
+	if (sk != NULL) {
+		pr_debug("rcv on socket %p\n", sk);
+		ping_queue_rcv_skb(sk, skb_get(skb));
+		sock_put(sk);
+		return;
+	}
+	pr_debug("no socket, dropping\n");
+
+	/* We're called from icmp_rcv(). kfree_skb() is done there. */
+}
+
+struct proto ping_prot = {
+	.name =		"PING",
+	.owner =	THIS_MODULE,
+	.init =		ping_init_sock,
+	.close =	ping_close,
+	.connect =	ip4_datagram_connect,
+	.disconnect =	udp_disconnect,
+	.ioctl =	ping_ioctl,
+	.setsockopt =	ip_setsockopt,
+	.getsockopt =	ip_getsockopt,
+	.sendmsg =	ping_sendmsg,
+	.recvmsg =	ping_recvmsg,
+	.bind =		ping_bind,
+	.backlog_rcv =	ping_queue_rcv_skb,
+	.hash =		ping_v4_hash,
+	.unhash =	ping_v4_unhash,
+	.get_port =	ping_v4_get_port,
+	.obj_size =	sizeof(struct inet_sock),
+};
+EXPORT_SYMBOL(ping_prot);
+
+#ifdef CONFIG_PROC_FS
+
+static struct sock *ping_get_first(struct seq_file *seq, int start)
+{
+	struct sock *sk;
+	struct ping_iter_state *state = seq->private;
+	struct net *net = seq_file_net(seq);
+
+	for (state->bucket = start; state->bucket < PING_HTABLE_SIZE;
+	     ++state->bucket) {
+		struct hlist_nulls_node *node;
+		struct hlist_nulls_head *hslot = &ping_table.hash[state->bucket];
+
+		if (hlist_nulls_empty(hslot))
+			continue;
+
+		sk_nulls_for_each(sk, node, hslot) {
+			if (net_eq(sock_net(sk), net))
+				goto found;
+		}
+	}
+	sk = NULL;
+found:
+	return sk;
+}
+
+static struct sock *ping_get_next(struct seq_file *seq, struct sock *sk)
+{
+	struct ping_iter_state *state = seq->private;
+	struct net *net = seq_file_net(seq);
+
+	do {
+		sk = sk_nulls_next(sk);
+	} while (sk && (!net_eq(sock_net(sk), net)));
+
+	if (!sk)
+		return ping_get_first(seq, state->bucket + 1);
+	return sk;
+}
+
+static struct sock *ping_get_idx(struct seq_file *seq, loff_t pos)
+{
+	struct sock *sk = ping_get_first(seq, 0);
+
+	if (sk)
+		while (pos && (sk = ping_get_next(seq, sk)) != NULL)
+			--pos;
+	return pos ? NULL : sk;
+}
+
+static void *ping_seq_start(struct seq_file *seq, loff_t *pos)
+{
+	struct ping_iter_state *state = seq->private;
+	state->bucket = 0;
+
+	read_lock_bh(&ping_table.lock);
+
+	return *pos ? ping_get_idx(seq, *pos-1) : SEQ_START_TOKEN;
+}
+
+static void *ping_seq_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+	struct sock *sk;
+
+	if (v == SEQ_START_TOKEN)
+		sk = ping_get_idx(seq, 0);
+	else
+		sk = ping_get_next(seq, v);
+
+	++*pos;
+	return sk;
+}
+
+static void ping_seq_stop(struct seq_file *seq, void *v)
+{
+	read_unlock_bh(&ping_table.lock);
+}
+
+static void ping_format_sock(struct sock *sp, struct seq_file *f,
+		int bucket, int *len)
+{
+	struct inet_sock *inet = inet_sk(sp);
+	__be32 dest = inet->inet_daddr;
+	__be32 src = inet->inet_rcv_saddr;
+	__u16 destp = ntohs(inet->inet_dport);
+	__u16 srcp = ntohs(inet->inet_sport);
+
+	seq_printf(f, "%5d: %08X:%04X %08X:%04X"
+		" %02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %pK %d%n",
+		bucket, src, srcp, dest, destp, sp->sk_state,
+		sk_wmem_alloc_get(sp),
+		sk_rmem_alloc_get(sp),
+		0, 0L, 0, sock_i_uid(sp), 0, sock_i_ino(sp),
+		atomic_read(&sp->sk_refcnt), sp,
+		atomic_read(&sp->sk_drops), len);
+}
+
+static int ping_seq_show(struct seq_file *seq, void *v)
+{
+	if (v == SEQ_START_TOKEN)
+		seq_printf(seq, "%-127s\n",
+			   "  sl  local_address rem_address   st tx_queue "
+			   "rx_queue tr tm->when retrnsmt   uid  timeout "
+			   "inode ref pointer drops");
+	else {
+		struct ping_iter_state *state = seq->private;
+		int len;
+
+		ping_format_sock(v, seq, state->bucket, &len);
+		seq_printf(seq, "%*s\n", 127 - len, "");
+	}
+	return 0;
+}
+
+static const struct seq_operations ping_seq_ops = {
+	.show		= ping_seq_show,
+	.start		= ping_seq_start,
+	.next		= ping_seq_next,
+	.stop		= ping_seq_stop,
+};
+
+static int ping_seq_open(struct inode *inode, struct file *file)
+{
+	return seq_open_net(inode, file, &ping_seq_ops,
+			   sizeof(struct ping_iter_state));
+}
+
+static const struct file_operations ping_seq_fops = {
+	.open		= ping_seq_open,
+	.read		= seq_read,
+	.llseek		= seq_lseek,
+	.release	= seq_release_net,
+};
+
+static int ping_proc_register(struct net *net)
+{
+	struct proc_dir_entry *p;
+	int rc = 0;
+
+	p = proc_net_fops_create(net, "icmp", S_IRUGO, &ping_seq_fops);
+	if (!p)
+		rc = -ENOMEM;
+	return rc;
+}
+
+static void ping_proc_unregister(struct net *net)
+{
+	proc_net_remove(net, "icmp");
+}
+
+
+static int __net_init ping_proc_init_net(struct net *net)
+{
+	return ping_proc_register(net);
+}
+
+static void __net_exit ping_proc_exit_net(struct net *net)
+{
+	ping_proc_unregister(net);
+}
+
+static struct pernet_operations ping_net_ops = {
+	.init = ping_proc_init_net,
+	.exit = ping_proc_exit_net,
+};
+
+int __init ping_proc_init(void)
+{
+	return register_pernet_subsys(&ping_net_ops);
+}
+
+void ping_proc_exit(void)
+{
+	unregister_pernet_subsys(&ping_net_ops);
+}
+
+#endif
+
+void __init ping_init(void)
+{
+	int i;
+
+	for (i = 0; i < PING_HTABLE_SIZE; i++)
+		INIT_HLIST_NULLS_HEAD(&ping_table.hash[i], i);
+	rwlock_init(&ping_table.lock);
+}