Merge tag 'v4.0' into for_next

Linux 4.0

1 files changed, 1084 insertions, 0 deletions

diff --git a/net/tipc/netlink_compat.c b/net/tipc/netlink_compat.c
new file mode 100644
index 000000000000..ce9121e8e990
--- /dev/null
+++ b/net/tipc/netlink_compat.c
@@ -0,0 +1,1084 @@
+/*
+ * Copyright (c) 2014, Ericsson AB
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the names of the copyright holders nor the names of its
+ *    contributors may be used to endorse or promote products derived from
+ *    this software without specific prior written permission.
+ *
+ * Alternatively, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") version 2 as published by the Free
+ * Software Foundation.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "core.h"
+#include "bearer.h"
+#include "link.h"
+#include "name_table.h"
+#include "socket.h"
+#include "node.h"
+#include "net.h"
+#include <net/genetlink.h>
+#include <linux/tipc_config.h>
+
+/* The legacy API had an artificial message length limit called
+ * ULTRA_STRING_MAX_LEN.
+ */
+#define ULTRA_STRING_MAX_LEN 32768
+
+#define TIPC_SKB_MAX TLV_SPACE(ULTRA_STRING_MAX_LEN)
+
+#define REPLY_TRUNCATED "<truncated>\n"
+
+struct tipc_nl_compat_msg {
+	u16 cmd;
+	int rep_type;
+	int rep_size;
+	int req_type;
+	struct sk_buff *rep;
+	struct tlv_desc *req;
+	struct sock *dst_sk;
+};
+
+struct tipc_nl_compat_cmd_dump {
+	int (*header)(struct tipc_nl_compat_msg *);
+	int (*dumpit)(struct sk_buff *, struct netlink_callback *);
+	int (*format)(struct tipc_nl_compat_msg *msg, struct nlattr **attrs);
+};
+
+struct tipc_nl_compat_cmd_doit {
+	int (*doit)(struct sk_buff *skb, struct genl_info *info);
+	int (*transcode)(struct sk_buff *skb, struct tipc_nl_compat_msg *msg);
+};
+
+static int tipc_skb_tailroom(struct sk_buff *skb)
+{
+	int tailroom;
+	int limit;
+
+	tailroom = skb_tailroom(skb);
+	limit = TIPC_SKB_MAX - skb->len;
+
+	if (tailroom < limit)
+		return tailroom;
+
+	return limit;
+}
+
+static int tipc_add_tlv(struct sk_buff *skb, u16 type, void *data, u16 len)
+{
+	struct tlv_desc *tlv = (struct tlv_desc *)skb_tail_pointer(skb);
+
+	if (tipc_skb_tailroom(skb) < TLV_SPACE(len))
+		return -EMSGSIZE;
+
+	skb_put(skb, TLV_SPACE(len));
+	tlv->tlv_type = htons(type);
+	tlv->tlv_len = htons(TLV_LENGTH(len));
+	if (len && data)
+		memcpy(TLV_DATA(tlv), data, len);
+
+	return 0;
+}
+
+static void tipc_tlv_init(struct sk_buff *skb, u16 type)
+{
+	struct tlv_desc *tlv = (struct tlv_desc *)skb->data;
+
+	TLV_SET_LEN(tlv, 0);
+	TLV_SET_TYPE(tlv, type);
+	skb_put(skb, sizeof(struct tlv_desc));
+}
+
+static int tipc_tlv_sprintf(struct sk_buff *skb, const char *fmt, ...)
+{
+	int n;
+	u16 len;
+	u32 rem;
+	char *buf;
+	struct tlv_desc *tlv;
+	va_list args;
+
+	rem = tipc_skb_tailroom(skb);
+
+	tlv = (struct tlv_desc *)skb->data;
+	len = TLV_GET_LEN(tlv);
+	buf = TLV_DATA(tlv) + len;
+
+	va_start(args, fmt);
+	n = vscnprintf(buf, rem, fmt, args);
+	va_end(args);
+
+	TLV_SET_LEN(tlv, n + len);
+	skb_put(skb, n);
+
+	return n;
+}
+
+static struct sk_buff *tipc_tlv_alloc(int size)
+{
+	int hdr_len;
+	struct sk_buff *buf;
+
+	size = TLV_SPACE(size);
+	hdr_len = nlmsg_total_size(GENL_HDRLEN + TIPC_GENL_HDRLEN);
+
+	buf = alloc_skb(hdr_len + size, GFP_KERNEL);
+	if (!buf)
+		return NULL;
+
+	skb_reserve(buf, hdr_len);
+
+	return buf;
+}
+
+static struct sk_buff *tipc_get_err_tlv(char *str)
+{
+	int str_len = strlen(str) + 1;
+	struct sk_buff *buf;
+
+	buf = tipc_tlv_alloc(TLV_SPACE(str_len));
+	if (buf)
+		tipc_add_tlv(buf, TIPC_TLV_ERROR_STRING, str, str_len);
+
+	return buf;
+}
+
+static int __tipc_nl_compat_dumpit(struct tipc_nl_compat_cmd_dump *cmd,
+				   struct tipc_nl_compat_msg *msg,
+				   struct sk_buff *arg)
+{
+	int len = 0;
+	int err;
+	struct sk_buff *buf;
+	struct nlmsghdr *nlmsg;
+	struct netlink_callback cb;
+
+	memset(&cb, 0, sizeof(cb));
+	cb.nlh = (struct nlmsghdr *)arg->data;
+	cb.skb = arg;
+
+	buf = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
+	if (!buf)
+		return -ENOMEM;
+
+	buf->sk = msg->dst_sk;
+
+	do {
+		int rem;
+
+		len = (*cmd->dumpit)(buf, &cb);
+
+		nlmsg_for_each_msg(nlmsg, nlmsg_hdr(buf), len, rem) {
+			struct nlattr **attrs;
+
+			err = tipc_nlmsg_parse(nlmsg, &attrs);
+			if (err)
+				goto err_out;
+
+			err = (*cmd->format)(msg, attrs);
+			if (err)
+				goto err_out;
+
+			if (tipc_skb_tailroom(msg->rep) <= 1) {
+				err = -EMSGSIZE;
+				goto err_out;
+			}
+		}
+
+		skb_reset_tail_pointer(buf);
+		buf->len = 0;
+
+	} while (len);
+
+	err = 0;
+
+err_out:
+	kfree_skb(buf);
+
+	if (err == -EMSGSIZE) {
+		/* The legacy API only considered messages filling
+		 * "ULTRA_STRING_MAX_LEN" to be truncated.
+		 */
+		if ((TIPC_SKB_MAX - msg->rep->len) <= 1) {
+			char *tail = skb_tail_pointer(msg->rep);
+
+			if (*tail != '\0')
+				sprintf(tail - sizeof(REPLY_TRUNCATED) - 1,
+					REPLY_TRUNCATED);
+		}
+
+		return 0;
+	}
+
+	return err;
+}
+
+static int tipc_nl_compat_dumpit(struct tipc_nl_compat_cmd_dump *cmd,
+				 struct tipc_nl_compat_msg *msg)
+{
+	int err;
+	struct sk_buff *arg;
+
+	if (msg->req_type && !TLV_CHECK_TYPE(msg->req, msg->req_type))
+		return -EINVAL;
+
+	msg->rep = tipc_tlv_alloc(msg->rep_size);
+	if (!msg->rep)
+		return -ENOMEM;
+
+	if (msg->rep_type)
+		tipc_tlv_init(msg->rep, msg->rep_type);
+
+	if (cmd->header)
+		(*cmd->header)(msg);
+
+	arg = nlmsg_new(0, GFP_KERNEL);
+	if (!arg) {
+		kfree_skb(msg->rep);
+		return -ENOMEM;
+	}
+
+	err = __tipc_nl_compat_dumpit(cmd, msg, arg);
+	if (err)
+		kfree_skb(msg->rep);
+
+	kfree_skb(arg);
+
+	return err;
+}
+
+static int __tipc_nl_compat_doit(struct tipc_nl_compat_cmd_doit *cmd,
+				 struct tipc_nl_compat_msg *msg)
+{
+	int err;
+	struct sk_buff *doit_buf;
+	struct sk_buff *trans_buf;
+	struct nlattr **attrbuf;
+	struct genl_info info;
+
+	trans_buf = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
+	if (!trans_buf)
+		return -ENOMEM;
+
+	err = (*cmd->transcode)(trans_buf, msg);
+	if (err)
+		goto trans_out;
+
+	attrbuf = kmalloc((tipc_genl_family.maxattr + 1) *
+			sizeof(struct nlattr *), GFP_KERNEL);
+	if (!attrbuf) {
+		err = -ENOMEM;
+		goto trans_out;
+	}
+
+	err = nla_parse(attrbuf, tipc_genl_family.maxattr,
+			(const struct nlattr *)trans_buf->data,
+			trans_buf->len, NULL);
+	if (err)
+		goto parse_out;
+
+	doit_buf = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
+	if (!doit_buf) {
+		err = -ENOMEM;
+		goto parse_out;
+	}
+
+	doit_buf->sk = msg->dst_sk;
+
+	memset(&info, 0, sizeof(info));
+	info.attrs = attrbuf;
+
+	err = (*cmd->doit)(doit_buf, &info);
+
+	kfree_skb(doit_buf);
+parse_out:
+	kfree(attrbuf);
+trans_out:
+	kfree_skb(trans_buf);
+
+	return err;
+}
+
+static int tipc_nl_compat_doit(struct tipc_nl_compat_cmd_doit *cmd,
+			       struct tipc_nl_compat_msg *msg)
+{
+	int err;
+
+	if (msg->req_type && !TLV_CHECK_TYPE(msg->req, msg->req_type))
+		return -EINVAL;
+
+	err = __tipc_nl_compat_doit(cmd, msg);
+	if (err)
+		return err;
+
+	/* The legacy API considered an empty message a success message */
+	msg->rep = tipc_tlv_alloc(0);
+	if (!msg->rep)
+		return -ENOMEM;
+
+	return 0;
+}
+
+static int tipc_nl_compat_bearer_dump(struct tipc_nl_compat_msg *msg,
+				      struct nlattr **attrs)
+{
+	struct nlattr *bearer[TIPC_NLA_BEARER_MAX + 1];
+
+	nla_parse_nested(bearer, TIPC_NLA_BEARER_MAX, attrs[TIPC_NLA_BEARER],
+			 NULL);
+
+	return tipc_add_tlv(msg->rep, TIPC_TLV_BEARER_NAME,
+			    nla_data(bearer[TIPC_NLA_BEARER_NAME]),
+			    nla_len(bearer[TIPC_NLA_BEARER_NAME]));
+}
+
+static int tipc_nl_compat_bearer_enable(struct sk_buff *skb,
+					struct tipc_nl_compat_msg *msg)
+{
+	struct nlattr *prop;
+	struct nlattr *bearer;
+	struct tipc_bearer_config *b;
+
+	b = (struct tipc_bearer_config *)TLV_DATA(msg->req);
+
+	bearer = nla_nest_start(skb, TIPC_NLA_BEARER);
+	if (!bearer)
+		return -EMSGSIZE;
+
+	if (nla_put_string(skb, TIPC_NLA_BEARER_NAME, b->name))
+		return -EMSGSIZE;
+
+	if (nla_put_u32(skb, TIPC_NLA_BEARER_DOMAIN, ntohl(b->disc_domain)))
+		return -EMSGSIZE;
+
+	if (ntohl(b->priority) <= TIPC_MAX_LINK_PRI) {
+		prop = nla_nest_start(skb, TIPC_NLA_BEARER_PROP);
+		if (!prop)
+			return -EMSGSIZE;
+		if (nla_put_u32(skb, TIPC_NLA_PROP_PRIO, ntohl(b->priority)))
+			return -EMSGSIZE;
+		nla_nest_end(skb, prop);
+	}
+	nla_nest_end(skb, bearer);
+
+	return 0;
+}
+
+static int tipc_nl_compat_bearer_disable(struct sk_buff *skb,
+					 struct tipc_nl_compat_msg *msg)
+{
+	char *name;
+	struct nlattr *bearer;
+
+	name = (char *)TLV_DATA(msg->req);
+
+	bearer = nla_nest_start(skb, TIPC_NLA_BEARER);
+	if (!bearer)
+		return -EMSGSIZE;
+
+	if (nla_put_string(skb, TIPC_NLA_BEARER_NAME, name))
+		return -EMSGSIZE;
+
+	nla_nest_end(skb, bearer);
+
+	return 0;
+}
+
+static inline u32 perc(u32 count, u32 total)
+{
+	return (count * 100 + (total / 2)) / total;
+}
+
+static void __fill_bc_link_stat(struct tipc_nl_compat_msg *msg,
+				struct nlattr *prop[], struct nlattr *stats[])
+{
+	tipc_tlv_sprintf(msg->rep, "  Window:%u packets\n",
+			 nla_get_u32(prop[TIPC_NLA_PROP_WIN]));
+
+	tipc_tlv_sprintf(msg->rep,
+			 "  RX packets:%u fragments:%u/%u bundles:%u/%u\n",
+			 nla_get_u32(stats[TIPC_NLA_STATS_RX_INFO]),
+			 nla_get_u32(stats[TIPC_NLA_STATS_RX_FRAGMENTS]),
+			 nla_get_u32(stats[TIPC_NLA_STATS_RX_FRAGMENTED]),
+			 nla_get_u32(stats[TIPC_NLA_STATS_RX_BUNDLES]),
+			 nla_get_u32(stats[TIPC_NLA_STATS_RX_BUNDLED]));
+
+	tipc_tlv_sprintf(msg->rep,
+			 "  TX packets:%u fragments:%u/%u bundles:%u/%u\n",
+			 nla_get_u32(stats[TIPC_NLA_STATS_TX_INFO]),
+			 nla_get_u32(stats[TIPC_NLA_STATS_TX_FRAGMENTS]),
+			 nla_get_u32(stats[TIPC_NLA_STATS_TX_FRAGMENTED]),
+			 nla_get_u32(stats[TIPC_NLA_STATS_TX_BUNDLES]),
+			 nla_get_u32(stats[TIPC_NLA_STATS_TX_BUNDLED]));
+
+	tipc_tlv_sprintf(msg->rep, "  RX naks:%u defs:%u dups:%u\n",
+			 nla_get_u32(stats[TIPC_NLA_STATS_RX_NACKS]),
+			 nla_get_u32(stats[TIPC_NLA_STATS_RX_DEFERRED]),
+			 nla_get_u32(stats[TIPC_NLA_STATS_DUPLICATES]));
+
+	tipc_tlv_sprintf(msg->rep, "  TX naks:%u acks:%u dups:%u\n",
+			 nla_get_u32(stats[TIPC_NLA_STATS_TX_NACKS]),
+			 nla_get_u32(stats[TIPC_NLA_STATS_TX_ACKS]),
+			 nla_get_u32(stats[TIPC_NLA_STATS_RETRANSMITTED]));
+
+	tipc_tlv_sprintf(msg->rep,
+			 "  Congestion link:%u  Send queue max:%u avg:%u",
+			 nla_get_u32(stats[TIPC_NLA_STATS_LINK_CONGS]),
+			 nla_get_u32(stats[TIPC_NLA_STATS_MAX_QUEUE]),
+			 nla_get_u32(stats[TIPC_NLA_STATS_AVG_QUEUE]));
+}
+
+static int tipc_nl_compat_link_stat_dump(struct tipc_nl_compat_msg *msg,
+					 struct nlattr **attrs)
+{
+	char *name;
+	struct nlattr *link[TIPC_NLA_LINK_MAX + 1];
+	struct nlattr *prop[TIPC_NLA_PROP_MAX + 1];
+	struct nlattr *stats[TIPC_NLA_STATS_MAX + 1];
+
+	nla_parse_nested(link, TIPC_NLA_LINK_MAX, attrs[TIPC_NLA_LINK], NULL);
+
+	nla_parse_nested(prop, TIPC_NLA_PROP_MAX, link[TIPC_NLA_LINK_PROP],
+			 NULL);
+
+	nla_parse_nested(stats, TIPC_NLA_STATS_MAX, link[TIPC_NLA_LINK_STATS],
+			 NULL);
+
+	name = (char *)TLV_DATA(msg->req);
+	if (strcmp(name, nla_data(link[TIPC_NLA_LINK_NAME])) != 0)
+		return 0;
+
+	tipc_tlv_sprintf(msg->rep, "\nLink <%s>\n",
+			 nla_data(link[TIPC_NLA_LINK_NAME]));
+
+	if (link[TIPC_NLA_LINK_BROADCAST]) {
+		__fill_bc_link_stat(msg, prop, stats);
+		return 0;
+	}
+
+	if (link[TIPC_NLA_LINK_ACTIVE])
+		tipc_tlv_sprintf(msg->rep, "  ACTIVE");
+	else if (link[TIPC_NLA_LINK_UP])
+		tipc_tlv_sprintf(msg->rep, "  STANDBY");
+	else
+		tipc_tlv_sprintf(msg->rep, "  DEFUNCT");
+
+	tipc_tlv_sprintf(msg->rep, "  MTU:%u  Priority:%u",
+			 nla_get_u32(link[TIPC_NLA_LINK_MTU]),
+			 nla_get_u32(prop[TIPC_NLA_PROP_PRIO]));
+
+	tipc_tlv_sprintf(msg->rep, "  Tolerance:%u ms  Window:%u packets\n",
+			 nla_get_u32(prop[TIPC_NLA_PROP_TOL]),
+			 nla_get_u32(prop[TIPC_NLA_PROP_WIN]));
+
+	tipc_tlv_sprintf(msg->rep,
+			 "  RX packets:%u fragments:%u/%u bundles:%u/%u\n",
+			 nla_get_u32(link[TIPC_NLA_LINK_RX]) -
+			 nla_get_u32(stats[TIPC_NLA_STATS_RX_INFO]),
+			 nla_get_u32(stats[TIPC_NLA_STATS_RX_FRAGMENTS]),
+			 nla_get_u32(stats[TIPC_NLA_STATS_RX_FRAGMENTED]),
+			 nla_get_u32(stats[TIPC_NLA_STATS_RX_BUNDLES]),
+			 nla_get_u32(stats[TIPC_NLA_STATS_RX_BUNDLED]));
+
+	tipc_tlv_sprintf(msg->rep,
+			 "  TX packets:%u fragments:%u/%u bundles:%u/%u\n",
+			 nla_get_u32(link[TIPC_NLA_LINK_TX]) -
+			 nla_get_u32(stats[TIPC_NLA_STATS_TX_INFO]),
+			 nla_get_u32(stats[TIPC_NLA_STATS_TX_FRAGMENTS]),
+			 nla_get_u32(stats[TIPC_NLA_STATS_TX_FRAGMENTED]),
+			 nla_get_u32(stats[TIPC_NLA_STATS_TX_BUNDLES]),
+			 nla_get_u32(stats[TIPC_NLA_STATS_TX_BUNDLED]));
+
+	tipc_tlv_sprintf(msg->rep,
+			 "  TX profile sample:%u packets  average:%u octets\n",
+			 nla_get_u32(stats[TIPC_NLA_STATS_MSG_LEN_CNT]),
+			 nla_get_u32(stats[TIPC_NLA_STATS_MSG_LEN_TOT]) /
+			 nla_get_u32(stats[TIPC_NLA_STATS_MSG_PROF_TOT]));
+
+	tipc_tlv_sprintf(msg->rep,
+			 "  0-64:%u%% -256:%u%% -1024:%u%% -4096:%u%% ",
+			 perc(nla_get_u32(stats[TIPC_NLA_STATS_MSG_LEN_P0]),
+			      nla_get_u32(stats[TIPC_NLA_STATS_MSG_PROF_TOT])),
+			 perc(nla_get_u32(stats[TIPC_NLA_STATS_MSG_LEN_P1]),
+			      nla_get_u32(stats[TIPC_NLA_STATS_MSG_PROF_TOT])),
+			 perc(nla_get_u32(stats[TIPC_NLA_STATS_MSG_LEN_P2]),
+			      nla_get_u32(stats[TIPC_NLA_STATS_MSG_PROF_TOT])),
+			 perc(nla_get_u32(stats[TIPC_NLA_STATS_MSG_LEN_P3]),
+			      nla_get_u32(stats[TIPC_NLA_STATS_MSG_PROF_TOT])));
+
+	tipc_tlv_sprintf(msg->rep, "-16384:%u%% -32768:%u%% -66000:%u%%\n",
+			 perc(nla_get_u32(stats[TIPC_NLA_STATS_MSG_LEN_P4]),
+			      nla_get_u32(stats[TIPC_NLA_STATS_MSG_PROF_TOT])),
+			 perc(nla_get_u32(stats[TIPC_NLA_STATS_MSG_LEN_P5]),
+			      nla_get_u32(stats[TIPC_NLA_STATS_MSG_PROF_TOT])),
+			 perc(nla_get_u32(stats[TIPC_NLA_STATS_MSG_LEN_P6]),
+			      nla_get_u32(stats[TIPC_NLA_STATS_MSG_PROF_TOT])));
+
+	tipc_tlv_sprintf(msg->rep,
+			 "  RX states:%u probes:%u naks:%u defs:%u dups:%u\n",
+			 nla_get_u32(stats[TIPC_NLA_STATS_RX_STATES]),
+			 nla_get_u32(stats[TIPC_NLA_STATS_RX_PROBES]),
+			 nla_get_u32(stats[TIPC_NLA_STATS_RX_NACKS]),
+			 nla_get_u32(stats[TIPC_NLA_STATS_RX_DEFERRED]),
+			 nla_get_u32(stats[TIPC_NLA_STATS_DUPLICATES]));
+
+	tipc_tlv_sprintf(msg->rep,
+			 "  TX states:%u probes:%u naks:%u acks:%u dups:%u\n",
+			 nla_get_u32(stats[TIPC_NLA_STATS_TX_STATES]),
+			 nla_get_u32(stats[TIPC_NLA_STATS_TX_PROBES]),
+			 nla_get_u32(stats[TIPC_NLA_STATS_TX_NACKS]),
+			 nla_get_u32(stats[TIPC_NLA_STATS_TX_ACKS]),
+			 nla_get_u32(stats[TIPC_NLA_STATS_RETRANSMITTED]));
+
+	tipc_tlv_sprintf(msg->rep,
+			 "  Congestion link:%u  Send queue max:%u avg:%u",
+			 nla_get_u32(stats[TIPC_NLA_STATS_LINK_CONGS]),
+			 nla_get_u32(stats[TIPC_NLA_STATS_MAX_QUEUE]),
+			 nla_get_u32(stats[TIPC_NLA_STATS_AVG_QUEUE]));
+
+	return 0;
+}
+
+static int tipc_nl_compat_link_dump(struct tipc_nl_compat_msg *msg,
+				    struct nlattr **attrs)
+{
+	struct nlattr *link[TIPC_NLA_LINK_MAX + 1];
+	struct tipc_link_info link_info;
+
+	nla_parse_nested(link, TIPC_NLA_LINK_MAX, attrs[TIPC_NLA_LINK], NULL);
+
+	link_info.dest = nla_get_flag(link[TIPC_NLA_LINK_DEST]);
+	link_info.up = htonl(nla_get_flag(link[TIPC_NLA_LINK_UP]));
+	strcpy(link_info.str, nla_data(link[TIPC_NLA_LINK_NAME]));
+
+	return tipc_add_tlv(msg->rep, TIPC_TLV_LINK_INFO,
+			    &link_info, sizeof(link_info));
+}
+
+static int tipc_nl_compat_link_set(struct sk_buff *skb,
+				   struct tipc_nl_compat_msg *msg)
+{
+	struct nlattr *link;
+	struct nlattr *prop;
+	struct tipc_link_config *lc;
+
+	lc = (struct tipc_link_config *)TLV_DATA(msg->req);
+
+	link = nla_nest_start(skb, TIPC_NLA_LINK);
+	if (!link)
+		return -EMSGSIZE;
+
+	if (nla_put_string(skb, TIPC_NLA_LINK_NAME, lc->name))
+		return -EMSGSIZE;
+
+	prop = nla_nest_start(skb, TIPC_NLA_LINK_PROP);
+	if (!prop)
+		return -EMSGSIZE;
+
+	if (msg->cmd == TIPC_CMD_SET_LINK_PRI) {
+		if (nla_put_u32(skb, TIPC_NLA_PROP_PRIO, ntohl(lc->value)))
+			return -EMSGSIZE;
+	} else if (msg->cmd == TIPC_CMD_SET_LINK_TOL) {
+		if (nla_put_u32(skb, TIPC_NLA_PROP_TOL, ntohl(lc->value)))
+			return -EMSGSIZE;
+	} else if (msg->cmd == TIPC_CMD_SET_LINK_WINDOW) {
+		if (nla_put_u32(skb, TIPC_NLA_PROP_WIN, ntohl(lc->value)))
+			return -EMSGSIZE;
+	}
+
+	nla_nest_end(skb, prop);
+	nla_nest_end(skb, link);
+
+	return 0;
+}
+
+static int tipc_nl_compat_link_reset_stats(struct sk_buff *skb,
+					   struct tipc_nl_compat_msg *msg)
+{
+	char *name;
+	struct nlattr *link;
+
+	name = (char *)TLV_DATA(msg->req);
+
+	link = nla_nest_start(skb, TIPC_NLA_LINK);
+	if (!link)
+		return -EMSGSIZE;
+
+	if (nla_put_string(skb, TIPC_NLA_LINK_NAME, name))
+		return -EMSGSIZE;
+
+	nla_nest_end(skb, link);
+
+	return 0;
+}
+
+static int tipc_nl_compat_name_table_dump_header(struct tipc_nl_compat_msg *msg)
+{
+	int i;
+	u32 depth;
+	struct tipc_name_table_query *ntq;
+	static const char * const header[] = {
+		"Type       ",
+		"Lower      Upper      ",
+		"Port Identity              ",
+		"Publication Scope"
+	};
+
+	ntq = (struct tipc_name_table_query *)TLV_DATA(msg->req);
+
+	depth = ntohl(ntq->depth);
+
+	if (depth > 4)
+		depth = 4;
+	for (i = 0; i < depth; i++)
+		tipc_tlv_sprintf(msg->rep, header[i]);
+	tipc_tlv_sprintf(msg->rep, "\n");
+
+	return 0;
+}
+
+static int tipc_nl_compat_name_table_dump(struct tipc_nl_compat_msg *msg,
+					  struct nlattr **attrs)
+{
+	char port_str[27];
+	struct tipc_name_table_query *ntq;
+	struct nlattr *nt[TIPC_NLA_NAME_TABLE_MAX + 1];
+	struct nlattr *publ[TIPC_NLA_PUBL_MAX + 1];
+	u32 node, depth, type, lowbound, upbound;
+	static const char * const scope_str[] = {"", " zone", " cluster",
+						 " node"};
+
+	nla_parse_nested(nt, TIPC_NLA_NAME_TABLE_MAX,
+			 attrs[TIPC_NLA_NAME_TABLE], NULL);
+
+	nla_parse_nested(publ, TIPC_NLA_PUBL_MAX, nt[TIPC_NLA_NAME_TABLE_PUBL],
+			 NULL);
+
+	ntq = (struct tipc_name_table_query *)TLV_DATA(msg->req);
+
+	depth = ntohl(ntq->depth);
+	type = ntohl(ntq->type);
+	lowbound = ntohl(ntq->lowbound);
+	upbound = ntohl(ntq->upbound);
+
+	if (!(depth & TIPC_NTQ_ALLTYPES) &&
+	    (type != nla_get_u32(publ[TIPC_NLA_PUBL_TYPE])))
+		return 0;
+	if (lowbound && (lowbound > nla_get_u32(publ[TIPC_NLA_PUBL_UPPER])))
+		return 0;
+	if (upbound && (upbound < nla_get_u32(publ[TIPC_NLA_PUBL_LOWER])))
+		return 0;
+
+	tipc_tlv_sprintf(msg->rep, "%-10u ",
+			 nla_get_u32(publ[TIPC_NLA_PUBL_TYPE]));
+
+	if (depth == 1)
+		goto out;
+
+	tipc_tlv_sprintf(msg->rep, "%-10u %-10u ",
+			 nla_get_u32(publ[TIPC_NLA_PUBL_LOWER]),
+			 nla_get_u32(publ[TIPC_NLA_PUBL_UPPER]));
+
+	if (depth == 2)
+		goto out;
+
+	node = nla_get_u32(publ[TIPC_NLA_PUBL_NODE]);
+	sprintf(port_str, "<%u.%u.%u:%u>", tipc_zone(node), tipc_cluster(node),
+		tipc_node(node), nla_get_u32(publ[TIPC_NLA_PUBL_REF]));
+	tipc_tlv_sprintf(msg->rep, "%-26s ", port_str);
+
+	if (depth == 3)
+		goto out;
+
+	tipc_tlv_sprintf(msg->rep, "%-10u %s",
+			 nla_get_u32(publ[TIPC_NLA_PUBL_REF]),
+			 scope_str[nla_get_u32(publ[TIPC_NLA_PUBL_SCOPE])]);
+out:
+	tipc_tlv_sprintf(msg->rep, "\n");
+
+	return 0;
+}
+
+static int __tipc_nl_compat_publ_dump(struct tipc_nl_compat_msg *msg,
+				      struct nlattr **attrs)
+{
+	u32 type, lower, upper;
+	struct nlattr *publ[TIPC_NLA_PUBL_MAX + 1];
+
+	nla_parse_nested(publ, TIPC_NLA_PUBL_MAX, attrs[TIPC_NLA_PUBL], NULL);
+
+	type = nla_get_u32(publ[TIPC_NLA_PUBL_TYPE]);
+	lower = nla_get_u32(publ[TIPC_NLA_PUBL_LOWER]);
+	upper = nla_get_u32(publ[TIPC_NLA_PUBL_UPPER]);
+
+	if (lower == upper)
+		tipc_tlv_sprintf(msg->rep, " {%u,%u}", type, lower);
+	else
+		tipc_tlv_sprintf(msg->rep, " {%u,%u,%u}", type, lower, upper);
+
+	return 0;
+}
+
+static int tipc_nl_compat_publ_dump(struct tipc_nl_compat_msg *msg, u32 sock)
+{
+	int err;
+	void *hdr;
+	struct nlattr *nest;
+	struct sk_buff *args;
+	struct tipc_nl_compat_cmd_dump dump;
+
+	args = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
+	if (!args)
+		return -ENOMEM;
+
+	hdr = genlmsg_put(args, 0, 0, &tipc_genl_family, NLM_F_MULTI,
+			  TIPC_NL_PUBL_GET);
+
+	nest = nla_nest_start(args, TIPC_NLA_SOCK);
+	if (!nest) {
+		kfree_skb(args);
+		return -EMSGSIZE;
+	}
+
+	if (nla_put_u32(args, TIPC_NLA_SOCK_REF, sock)) {
+		kfree_skb(args);
+		return -EMSGSIZE;
+	}
+
+	nla_nest_end(args, nest);
+	genlmsg_end(args, hdr);
+
+	dump.dumpit = tipc_nl_publ_dump;
+	dump.format = __tipc_nl_compat_publ_dump;
+
+	err = __tipc_nl_compat_dumpit(&dump, msg, args);
+
+	kfree_skb(args);
+
+	return err;
+}
+
+static int tipc_nl_compat_sk_dump(struct tipc_nl_compat_msg *msg,
+				  struct nlattr **attrs)
+{
+	int err;
+	u32 sock_ref;
+	struct nlattr *sock[TIPC_NLA_SOCK_MAX + 1];
+
+	nla_parse_nested(sock, TIPC_NLA_SOCK_MAX, attrs[TIPC_NLA_SOCK], NULL);
+
+	sock_ref = nla_get_u32(sock[TIPC_NLA_SOCK_REF]);
+	tipc_tlv_sprintf(msg->rep, "%u:", sock_ref);
+
+	if (sock[TIPC_NLA_SOCK_CON]) {
+		u32 node;
+		struct nlattr *con[TIPC_NLA_CON_MAX + 1];
+
+		nla_parse_nested(con, TIPC_NLA_CON_MAX, sock[TIPC_NLA_SOCK_CON],
+				 NULL);
+
+		node = nla_get_u32(con[TIPC_NLA_CON_NODE]);
+		tipc_tlv_sprintf(msg->rep, "  connected to <%u.%u.%u:%u>",
+				 tipc_zone(node),
+				 tipc_cluster(node),
+				 tipc_node(node),
+				 nla_get_u32(con[TIPC_NLA_CON_SOCK]));
+
+		if (con[TIPC_NLA_CON_FLAG])
+			tipc_tlv_sprintf(msg->rep, " via {%u,%u}\n",
+					 nla_get_u32(con[TIPC_NLA_CON_TYPE]),
+					 nla_get_u32(con[TIPC_NLA_CON_INST]));
+		else
+			tipc_tlv_sprintf(msg->rep, "\n");
+	} else if (sock[TIPC_NLA_SOCK_HAS_PUBL]) {
+		tipc_tlv_sprintf(msg->rep, " bound to");
+
+		err = tipc_nl_compat_publ_dump(msg, sock_ref);
+		if (err)
+			return err;
+	}
+	tipc_tlv_sprintf(msg->rep, "\n");
+
+	return 0;
+}
+
+static int tipc_nl_compat_media_dump(struct tipc_nl_compat_msg *msg,
+				     struct nlattr **attrs)
+{
+	struct nlattr *media[TIPC_NLA_MEDIA_MAX + 1];
+
+	nla_parse_nested(media, TIPC_NLA_MEDIA_MAX, attrs[TIPC_NLA_MEDIA],
+			 NULL);
+
+	return tipc_add_tlv(msg->rep, TIPC_TLV_MEDIA_NAME,
+			    nla_data(media[TIPC_NLA_MEDIA_NAME]),
+			    nla_len(media[TIPC_NLA_MEDIA_NAME]));
+}
+
+static int tipc_nl_compat_node_dump(struct tipc_nl_compat_msg *msg,
+				    struct nlattr **attrs)
+{
+	struct tipc_node_info node_info;
+	struct nlattr *node[TIPC_NLA_NODE_MAX + 1];
+
+	nla_parse_nested(node, TIPC_NLA_NODE_MAX, attrs[TIPC_NLA_NODE], NULL);
+
+	node_info.addr = htonl(nla_get_u32(node[TIPC_NLA_NODE_ADDR]));
+	node_info.up = htonl(nla_get_flag(node[TIPC_NLA_NODE_UP]));
+
+	return tipc_add_tlv(msg->rep, TIPC_TLV_NODE_INFO, &node_info,
+			    sizeof(node_info));
+}
+
+static int tipc_nl_compat_net_set(struct sk_buff *skb,
+				  struct tipc_nl_compat_msg *msg)
+{
+	u32 val;
+	struct nlattr *net;
+
+	val = ntohl(*(__be32 *)TLV_DATA(msg->req));
+
+	net = nla_nest_start(skb, TIPC_NLA_NET);
+	if (!net)
+		return -EMSGSIZE;
+
+	if (msg->cmd == TIPC_CMD_SET_NODE_ADDR) {
+		if (nla_put_u32(skb, TIPC_NLA_NET_ADDR, val))
+			return -EMSGSIZE;
+	} else if (msg->cmd == TIPC_CMD_SET_NETID) {
+		if (nla_put_u32(skb, TIPC_NLA_NET_ID, val))
+			return -EMSGSIZE;
+	}
+	nla_nest_end(skb, net);
+
+	return 0;
+}
+
+static int tipc_nl_compat_net_dump(struct tipc_nl_compat_msg *msg,
+				   struct nlattr **attrs)
+{
+	__be32 id;
+	struct nlattr *net[TIPC_NLA_NET_MAX + 1];
+
+	nla_parse_nested(net, TIPC_NLA_NET_MAX, attrs[TIPC_NLA_NET], NULL);
+	id = htonl(nla_get_u32(net[TIPC_NLA_NET_ID]));
+
+	return tipc_add_tlv(msg->rep, TIPC_TLV_UNSIGNED, &id, sizeof(id));
+}
+
+static int tipc_cmd_show_stats_compat(struct tipc_nl_compat_msg *msg)
+{
+	msg->rep = tipc_tlv_alloc(ULTRA_STRING_MAX_LEN);
+	if (!msg->rep)
+		return -ENOMEM;
+
+	tipc_tlv_init(msg->rep, TIPC_TLV_ULTRA_STRING);
+	tipc_tlv_sprintf(msg->rep, "TIPC version " TIPC_MOD_VER "\n");
+
+	return 0;
+}
+
+static int tipc_nl_compat_handle(struct tipc_nl_compat_msg *msg)
+{
+	struct tipc_nl_compat_cmd_dump dump;
+	struct tipc_nl_compat_cmd_doit doit;
+
+	memset(&dump, 0, sizeof(dump));
+	memset(&doit, 0, sizeof(doit));
+
+	switch (msg->cmd) {
+	case TIPC_CMD_NOOP:
+		msg->rep = tipc_tlv_alloc(0);
+		if (!msg->rep)
+			return -ENOMEM;
+		return 0;
+	case TIPC_CMD_GET_BEARER_NAMES:
+		msg->rep_size = MAX_BEARERS * TLV_SPACE(TIPC_MAX_BEARER_NAME);
+		dump.dumpit = tipc_nl_bearer_dump;
+		dump.format = tipc_nl_compat_bearer_dump;
+		return tipc_nl_compat_dumpit(&dump, msg);
+	case TIPC_CMD_ENABLE_BEARER:
+		msg->req_type = TIPC_TLV_BEARER_CONFIG;
+		doit.doit = tipc_nl_bearer_enable;
+		doit.transcode = tipc_nl_compat_bearer_enable;
+		return tipc_nl_compat_doit(&doit, msg);
+	case TIPC_CMD_DISABLE_BEARER:
+		msg->req_type = TIPC_TLV_BEARER_NAME;
+		doit.doit = tipc_nl_bearer_disable;
+		doit.transcode = tipc_nl_compat_bearer_disable;
+		return tipc_nl_compat_doit(&doit, msg);
+	case TIPC_CMD_SHOW_LINK_STATS:
+		msg->req_type = TIPC_TLV_LINK_NAME;
+		msg->rep_size = ULTRA_STRING_MAX_LEN;
+		msg->rep_type = TIPC_TLV_ULTRA_STRING;
+		dump.dumpit = tipc_nl_link_dump;
+		dump.format = tipc_nl_compat_link_stat_dump;
+		return tipc_nl_compat_dumpit(&dump, msg);
+	case TIPC_CMD_GET_LINKS:
+		msg->req_type = TIPC_TLV_NET_ADDR;
+		msg->rep_size = ULTRA_STRING_MAX_LEN;
+		dump.dumpit = tipc_nl_link_dump;
+		dump.format = tipc_nl_compat_link_dump;
+		return tipc_nl_compat_dumpit(&dump, msg);
+	case TIPC_CMD_SET_LINK_TOL:
+	case TIPC_CMD_SET_LINK_PRI:
+	case TIPC_CMD_SET_LINK_WINDOW:
+		msg->req_type =  TIPC_TLV_LINK_CONFIG;
+		doit.doit = tipc_nl_link_set;
+		doit.transcode = tipc_nl_compat_link_set;
+		return tipc_nl_compat_doit(&doit, msg);
+	case TIPC_CMD_RESET_LINK_STATS:
+		msg->req_type = TIPC_TLV_LINK_NAME;
+		doit.doit = tipc_nl_link_reset_stats;
+		doit.transcode = tipc_nl_compat_link_reset_stats;
+		return tipc_nl_compat_doit(&doit, msg);
+	case TIPC_CMD_SHOW_NAME_TABLE:
+		msg->req_type = TIPC_TLV_NAME_TBL_QUERY;
+		msg->rep_size = ULTRA_STRING_MAX_LEN;
+		msg->rep_type = TIPC_TLV_ULTRA_STRING;
+		dump.header = tipc_nl_compat_name_table_dump_header;
+		dump.dumpit = tipc_nl_name_table_dump;
+		dump.format = tipc_nl_compat_name_table_dump;
+		return tipc_nl_compat_dumpit(&dump, msg);
+	case TIPC_CMD_SHOW_PORTS:
+		msg->rep_size = ULTRA_STRING_MAX_LEN;
+		msg->rep_type = TIPC_TLV_ULTRA_STRING;
+		dump.dumpit = tipc_nl_sk_dump;
+		dump.format = tipc_nl_compat_sk_dump;
+		return tipc_nl_compat_dumpit(&dump, msg);
+	case TIPC_CMD_GET_MEDIA_NAMES:
+		msg->rep_size = MAX_MEDIA * TLV_SPACE(TIPC_MAX_MEDIA_NAME);
+		dump.dumpit = tipc_nl_media_dump;
+		dump.format = tipc_nl_compat_media_dump;
+		return tipc_nl_compat_dumpit(&dump, msg);
+	case TIPC_CMD_GET_NODES:
+		msg->rep_size = ULTRA_STRING_MAX_LEN;
+		dump.dumpit = tipc_nl_node_dump;
+		dump.format = tipc_nl_compat_node_dump;
+		return tipc_nl_compat_dumpit(&dump, msg);
+	case TIPC_CMD_SET_NODE_ADDR:
+		msg->req_type = TIPC_TLV_NET_ADDR;
+		doit.doit = tipc_nl_net_set;
+		doit.transcode = tipc_nl_compat_net_set;
+		return tipc_nl_compat_doit(&doit, msg);
+	case TIPC_CMD_SET_NETID:
+		msg->req_type = TIPC_TLV_UNSIGNED;
+		doit.doit = tipc_nl_net_set;
+		doit.transcode = tipc_nl_compat_net_set;
+		return tipc_nl_compat_doit(&doit, msg);
+	case TIPC_CMD_GET_NETID:
+		msg->rep_size = sizeof(u32);
+		dump.dumpit = tipc_nl_net_dump;
+		dump.format = tipc_nl_compat_net_dump;
+		return tipc_nl_compat_dumpit(&dump, msg);
+	case TIPC_CMD_SHOW_STATS:
+		return tipc_cmd_show_stats_compat(msg);
+	}
+
+	return -EOPNOTSUPP;
+}
+
+static int tipc_nl_compat_recv(struct sk_buff *skb, struct genl_info *info)
+{
+	int err;
+	int len;
+	struct tipc_nl_compat_msg msg;
+	struct nlmsghdr *req_nlh;
+	struct nlmsghdr *rep_nlh;
+	struct tipc_genlmsghdr *req_userhdr = info->userhdr;
+	struct net *net = genl_info_net(info);
+
+	memset(&msg, 0, sizeof(msg));
+
+	req_nlh = (struct nlmsghdr *)skb->data;
+	msg.req = nlmsg_data(req_nlh) + GENL_HDRLEN + TIPC_GENL_HDRLEN;
+	msg.cmd = req_userhdr->cmd;
+	msg.dst_sk = info->dst_sk;
+
+	if ((msg.cmd & 0xC000) && (!netlink_net_capable(skb, CAP_NET_ADMIN))) {
+		msg.rep = tipc_get_err_tlv(TIPC_CFG_NOT_NET_ADMIN);
+		err = -EACCES;
+		goto send;
+	}
+
+	len = nlmsg_attrlen(req_nlh, GENL_HDRLEN + TIPC_GENL_HDRLEN);
+	if (TLV_GET_LEN(msg.req) && !TLV_OK(msg.req, len)) {
+		msg.rep = tipc_get_err_tlv(TIPC_CFG_NOT_SUPPORTED);
+		err = -EOPNOTSUPP;
+		goto send;
+	}
+
+	err = tipc_nl_compat_handle(&msg);
+	if (err == -EOPNOTSUPP)
+		msg.rep = tipc_get_err_tlv(TIPC_CFG_NOT_SUPPORTED);
+	else if (err == -EINVAL)
+		msg.rep = tipc_get_err_tlv(TIPC_CFG_TLV_ERROR);
+send:
+	if (!msg.rep)
+		return err;
+
+	len = nlmsg_total_size(GENL_HDRLEN + TIPC_GENL_HDRLEN);
+	skb_push(msg.rep, len);
+	rep_nlh = nlmsg_hdr(msg.rep);
+	memcpy(rep_nlh, info->nlhdr, len);
+	rep_nlh->nlmsg_len = msg.rep->len;
+	genlmsg_unicast(net, msg.rep, NETLINK_CB(skb).portid);
+
+	return err;
+}
+
+static struct genl_family tipc_genl_compat_family = {
+	.id		= GENL_ID_GENERATE,
+	.name		= TIPC_GENL_NAME,
+	.version	= TIPC_GENL_VERSION,
+	.hdrsize	= TIPC_GENL_HDRLEN,
+	.maxattr	= 0,
+	.netnsok	= true,
+};
+
+static struct genl_ops tipc_genl_compat_ops[] = {
+	{
+		.cmd		= TIPC_GENL_CMD,
+		.doit		= tipc_nl_compat_recv,
+	},
+};
+
+int tipc_netlink_compat_start(void)
+{
+	int res;
+
+	res = genl_register_family_with_ops(&tipc_genl_compat_family,
+					    tipc_genl_compat_ops);
+	if (res) {
+		pr_err("Failed to register legacy compat interface\n");
+		return res;
+	}
+
+	return 0;
+}
+
+void tipc_netlink_compat_stop(void)
+{
+	genl_unregister_family(&tipc_genl_compat_family);
+}