text: /*
   * 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;
  	int req_size;
  	struct net *net;
  	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 tipc_nl_compat_cmd_doit *cmd,
  			 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 inline int TLV_GET_DATA_LEN(struct tlv_desc *tlv)
  {
  	return TLV_GET_LEN(tlv) - TLV_SPACE(0);
  }
  
  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 inline bool string_is_valid(char *s, int len)
  {
  	return memchr(s, '\0', len) ? true : false;
  }
  
  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 && (!msg->req_size ||
  			      !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) {
  		err = (*cmd->header)(msg);
  		if (err) {
  			kfree_skb(msg->rep);
  			msg->rep = NULL;
  			return err;
  		}
  	}
  
  	arg = nlmsg_new(0, GFP_KERNEL);
  	if (!arg) {
  		kfree_skb(msg->rep);
  		msg->rep = NULL;
  		return -ENOMEM;
  	}
  
  	err = __tipc_nl_compat_dumpit(cmd, msg, arg);
  	if (err) {
  		kfree_skb(msg->rep);
  		msg->rep = NULL;
  	}
  	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)(cmd, 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 && (!msg->req_size ||
  			      !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];
  	int err;
  
  	if (!attrs[TIPC_NLA_BEARER])
  		return -EINVAL;
  
  	err = nla_parse_nested(bearer, TIPC_NLA_BEARER_MAX,
  			       attrs[TIPC_NLA_BEARER], NULL);
  	if (err)
  		return err;
  
  	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 tipc_nl_compat_cmd_doit *cmd,
  					struct sk_buff *skb,
  					struct tipc_nl_compat_msg *msg)
  {
  	struct nlattr *prop;
  	struct nlattr *bearer;
  	struct tipc_bearer_config *b;
  	int len;
  
  	b = (struct tipc_bearer_config *)TLV_DATA(msg->req);
  
  	bearer = nla_nest_start(skb, TIPC_NLA_BEARER);
  	if (!bearer)
  		return -EMSGSIZE;
  
  	len = TLV_GET_DATA_LEN(msg->req);
  	len -= offsetof(struct tipc_bearer_config, name);
  	if (len <= 0)
  		return -EINVAL;
  
  	len = min_t(int, len, TIPC_MAX_BEARER_NAME);
  	if (!string_is_valid(b->name, len))
  		return -EINVAL;
  
  	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 tipc_nl_compat_cmd_doit *cmd,
  					 struct sk_buff *skb,
  					 struct tipc_nl_compat_msg *msg)
  {
  	char *name;
  	struct nlattr *bearer;
  	int len;
  
  	name = (char *)TLV_DATA(msg->req);
  
  	bearer = nla_nest_start(skb, TIPC_NLA_BEARER);
  	if (!bearer)
  		return -EMSGSIZE;
  
  	len = TLV_GET_DATA_LEN(msg->req);
  	if (len <= 0)
  		return -EINVAL;
  
  	len = min_t(int, len, TIPC_MAX_BEARER_NAME);
  	if (!string_is_valid(name, len))
  		return -EINVAL;
  
  	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];
  	int err;
  	int len;
  
  	if (!attrs[TIPC_NLA_LINK])
  		return -EINVAL;
  
  	err = nla_parse_nested(link, TIPC_NLA_LINK_MAX, attrs[TIPC_NLA_LINK],
  			       NULL);
  	if (err)
  		return err;
  
  	if (!link[TIPC_NLA_LINK_PROP])
  		return -EINVAL;
  
  	err = nla_parse_nested(prop, TIPC_NLA_PROP_MAX,
  			       link[TIPC_NLA_LINK_PROP], NULL);
  	if (err)
  		return err;
  
  	if (!link[TIPC_NLA_LINK_STATS])
  		return -EINVAL;
  
  	err = nla_parse_nested(stats, TIPC_NLA_STATS_MAX,
  			       link[TIPC_NLA_LINK_STATS], NULL);
  	if (err)
  		return err;
  
  	name = (char *)TLV_DATA(msg->req);
  
  	len = TLV_GET_DATA_LEN(msg->req);
  	if (len <= 0)
  		return -EINVAL;
  
  	len = min_t(int, len, TIPC_MAX_LINK_NAME);
  	if (!string_is_valid(name, len))
  		return -EINVAL;
  
  	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;
  	int err;
  
  	if (!attrs[TIPC_NLA_LINK])
  		return -EINVAL;
  
  	err = nla_parse_nested(link, TIPC_NLA_LINK_MAX, attrs[TIPC_NLA_LINK],
  			       NULL);
  	if (err)
  		return err;
  
  	link_info.dest = nla_get_flag(link[TIPC_NLA_LINK_DEST]);
  	link_info.up = htonl(nla_get_flag(link[TIPC_NLA_LINK_UP]));
  	nla_strlcpy(link_info.str, link[TIPC_NLA_LINK_NAME],
  		    TIPC_MAX_LINK_NAME);
  
  	return tipc_add_tlv(msg->rep, TIPC_TLV_LINK_INFO,
  			    &link_info, sizeof(link_info));
  }
  
  static int __tipc_add_link_prop(struct sk_buff *skb,
  				struct tipc_nl_compat_msg *msg,
  				struct tipc_link_config *lc)
  {
  	switch (msg->cmd) {
  	case TIPC_CMD_SET_LINK_PRI:
  		return nla_put_u32(skb, TIPC_NLA_PROP_PRIO, ntohl(lc->value));
  	case TIPC_CMD_SET_LINK_TOL:
  		return nla_put_u32(skb, TIPC_NLA_PROP_TOL, ntohl(lc->value));
  	case TIPC_CMD_SET_LINK_WINDOW:
  		return nla_put_u32(skb, TIPC_NLA_PROP_WIN, ntohl(lc->value));
  	}
  
  	return -EINVAL;
  }
  
  static int tipc_nl_compat_media_set(struct sk_buff *skb,
  				    struct tipc_nl_compat_msg *msg)
  {
  	struct nlattr *prop;
  	struct nlattr *media;
  	struct tipc_link_config *lc;
  	int len;
  
  	lc = (struct tipc_link_config *)TLV_DATA(msg->req);
  
  	media = nla_nest_start(skb, TIPC_NLA_MEDIA);
  	if (!media)
  		return -EMSGSIZE;
  
  	len = min_t(int, TLV_GET_DATA_LEN(msg->req), TIPC_MAX_MEDIA_NAME);
  	if (!string_is_valid(lc->name, len))
  		return -EINVAL;
  
  	if (nla_put_string(skb, TIPC_NLA_MEDIA_NAME, lc->name))
  		return -EMSGSIZE;
  
  	prop = nla_nest_start(skb, TIPC_NLA_MEDIA_PROP);
  	if (!prop)
  		return -EMSGSIZE;
  
  	__tipc_add_link_prop(skb, msg, lc);
  	nla_nest_end(skb, prop);
  	nla_nest_end(skb, media);
  
  	return 0;
  }
  
  static int tipc_nl_compat_bearer_set(struct sk_buff *skb,
  				     struct tipc_nl_compat_msg *msg)
  {
  	struct nlattr *prop;
  	struct nlattr *bearer;
  	struct tipc_link_config *lc;
  	int len;
  
  	lc = (struct tipc_link_config *)TLV_DATA(msg->req);
  
  	bearer = nla_nest_start(skb, TIPC_NLA_BEARER);
  	if (!bearer)
  		return -EMSGSIZE;
  
  	len = min_t(int, TLV_GET_DATA_LEN(msg->req), TIPC_MAX_MEDIA_NAME);
  	if (!string_is_valid(lc->name, len))
  		return -EINVAL;
  
  	if (nla_put_string(skb, TIPC_NLA_BEARER_NAME, lc->name))
  		return -EMSGSIZE;
  
  	prop = nla_nest_start(skb, TIPC_NLA_BEARER_PROP);
  	if (!prop)
  		return -EMSGSIZE;
  
  	__tipc_add_link_prop(skb, msg, lc);
  	nla_nest_end(skb, prop);
  	nla_nest_end(skb, bearer);
  
  	return 0;
  }
  
  static int __tipc_nl_compat_link_set(struct sk_buff *skb,
  				     struct tipc_nl_compat_msg *msg)
  {
  	struct nlattr *prop;
  	struct nlattr *link;
  	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;
  
  	__tipc_add_link_prop(skb, msg, lc);
  	nla_nest_end(skb, prop);
  	nla_nest_end(skb, link);
  
  	return 0;
  }
  
  static int tipc_nl_compat_link_set(struct tipc_nl_compat_cmd_doit *cmd,
  				   struct sk_buff *skb,
  				   struct tipc_nl_compat_msg *msg)
  {
  	struct tipc_link_config *lc;
  	struct tipc_bearer *bearer;
  	struct tipc_media *media;
  	int len;
  
  	lc = (struct tipc_link_config *)TLV_DATA(msg->req);
  
  	len = TLV_GET_DATA_LEN(msg->req);
  	len -= offsetof(struct tipc_link_config, name);
  	if (len <= 0)
  		return -EINVAL;
  
  	len = min_t(int, len, TIPC_MAX_LINK_NAME);
  	if (!string_is_valid(lc->name, len))
  		return -EINVAL;
  
  	media = tipc_media_find(lc->name);
  	if (media) {
  		cmd->doit = &tipc_nl_media_set;
  		return tipc_nl_compat_media_set(skb, msg);
  	}
  
  	bearer = tipc_bearer_find(msg->net, lc->name);
  	if (bearer) {
  		cmd->doit = &tipc_nl_bearer_set;
  		return tipc_nl_compat_bearer_set(skb, msg);
  	}
  
  	return __tipc_nl_compat_link_set(skb, msg);
  }
  
  static int tipc_nl_compat_link_reset_stats(struct tipc_nl_compat_cmd_doit *cmd,
  					   struct sk_buff *skb,
  					   struct tipc_nl_compat_msg *msg)
  {
  	char *name;
  	struct nlattr *link;
  	int len;
  
  	name = (char *)TLV_DATA(msg->req);
  
  	link = nla_nest_start(skb, TIPC_NLA_LINK);
  	if (!link)
  		return -EMSGSIZE;
  
  	len = TLV_GET_DATA_LEN(msg->req);
  	if (len <= 0)
  		return -EINVAL;
  
  	len = min_t(int, len, TIPC_MAX_LINK_NAME);
  	if (!string_is_valid(name, len))
  		return -EINVAL;
  
  	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);
  	if (TLV_GET_DATA_LEN(msg->req) < sizeof(struct tipc_name_table_query))
  		return -EINVAL;
  
  	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"};
  	int err;
  
  	if (!attrs[TIPC_NLA_NAME_TABLE])
  		return -EINVAL;
  
  	err = nla_parse_nested(nt, TIPC_NLA_NAME_TABLE_MAX,
  			       attrs[TIPC_NLA_NAME_TABLE], NULL);
  	if (err)
  		return err;
  
  	if (!nt[TIPC_NLA_NAME_TABLE_PUBL])
  		return -EINVAL;
  
  	err = nla_parse_nested(publ, TIPC_NLA_PUBL_MAX,
  			       nt[TIPC_NLA_NAME_TABLE_PUBL], NULL);
  	if (err)
  		return err;
  
  	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_KEY]),
  			 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];
  	int err;
  
  	if (!attrs[TIPC_NLA_PUBL])
  		return -EINVAL;
  
  	err = nla_parse_nested(publ, TIPC_NLA_PUBL_MAX, attrs[TIPC_NLA_PUBL],
  			       NULL);
  	if (err)
  		return err;
  
  	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);
  	if (!hdr) {
  		kfree_skb(args);
  		return -EMSGSIZE;
  	}
  
  	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];
  
  	if (!attrs[TIPC_NLA_SOCK])
  		return -EINVAL;
  
  	err = nla_parse_nested(sock, TIPC_NLA_SOCK_MAX, attrs[TIPC_NLA_SOCK],
  			       NULL);
  	if (err)
  		return err;
  
  	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];
  	int err;
  
  	if (!attrs[TIPC_NLA_MEDIA])
  		return -EINVAL;
  
  	err = nla_parse_nested(media, TIPC_NLA_MEDIA_MAX, attrs[TIPC_NLA_MEDIA],
  			       NULL);
  	if (err)
  		return err;
  
  	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];
  	int err;
  
  	if (!attrs[TIPC_NLA_NODE])
  		return -EINVAL;
  
  	err = nla_parse_nested(node, TIPC_NLA_NODE_MAX, attrs[TIPC_NLA_NODE],
  			       NULL);
  	if (err)
  		return err;
  
  	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 tipc_nl_compat_cmd_doit *cmd,
  				  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];
  	int err;
  
  	if (!attrs[TIPC_NLA_NET])
  		return -EINVAL;
  
  	err = nla_parse_nested(net, TIPC_NLA_NET_MAX, attrs[TIPC_NLA_NET],
  			       NULL);
  	if (err)
  		return err;
  
  	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_node_dump_link;
  		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_node_dump_link;
  		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_node_set_link;
  		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_node_reset_link_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;
  
  	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.net = genl_info_net(info);
  	msg.dst_sk = skb->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;
  	}
  
  	msg.req_size = nlmsg_attrlen(req_nlh, GENL_HDRLEN + TIPC_GENL_HDRLEN);
  	if (msg.req_size && !TLV_OK(msg.req, msg.req_size)) {
  		msg.rep = tipc_get_err_tlv(TIPC_CFG_NOT_SUPPORTED);
  		err = -EOPNOTSUPP;
  		goto send;
  	}
  
  	err = tipc_nl_compat_handle(&msg);
  	if ((err == -EOPNOTSUPP) || (err == -EPERM))
  		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(msg.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);
  }
  