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![Jon Maloy](/assets/img/avatar_default.png)
We introduce a simple variable window congestion control for links. The algorithm is inspired by the Reno algorithm, covering both 'slow start', 'congestion avoidance', and 'fast recovery' modes. - We introduce hard lower and upper window limits per link, still different and configurable per bearer type. - We introduce a 'slow start theshold' variable, initially set to the maximum window size. - We let a link start at the minimum congestion window, i.e. in slow start mode, and then let is grow rapidly (+1 per rceived ACK) until it reaches the slow start threshold and enters congestion avoidance mode. - In congestion avoidance mode we increment the congestion window for each window-size number of acked packets, up to a possible maximum equal to the configured maximum window. - For each non-duplicate NACK received, we drop back to fast recovery mode, by setting the both the slow start threshold to and the congestion window to (current_congestion_window / 2). - If the timeout handler finds that the transmit queue has not moved since the previous timeout, it drops the link back to slow start and forces a probe containing the last sent sequence number to the sent to the peer, so that this can discover the stale situation. This change does in reality have effect only on unicast ethernet transport, as we have seen that there is no room whatsoever for increasing the window max size for the UDP bearer. For now, we also choose to keep the limits for the broadcast link unchanged and equal. This algorithm seems to give a 50-100% throughput improvement for messages larger than MTU. Suggested-by: Xin Long <lucien.xin@gmail.com> Acked-by: Ying Xue <ying.xue@windriver.com> Signed-off-by: Jon Maloy <jon.maloy@ericsson.com> Signed-off-by: David S. Miller <davem@davemloft.net>
1304 lines
31 KiB
C
1304 lines
31 KiB
C
/*
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* net/tipc/bearer.c: TIPC bearer code
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*
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* Copyright (c) 1996-2006, 2013-2016, Ericsson AB
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* Copyright (c) 2004-2006, 2010-2013, Wind River Systems
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the names of the copyright holders nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <net/sock.h>
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#include "core.h"
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#include "bearer.h"
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#include "link.h"
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#include "discover.h"
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#include "monitor.h"
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#include "bcast.h"
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#include "netlink.h"
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#include "udp_media.h"
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#include "trace.h"
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#include "crypto.h"
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#define MAX_ADDR_STR 60
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static struct tipc_media * const media_info_array[] = {
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ð_media_info,
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#ifdef CONFIG_TIPC_MEDIA_IB
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&ib_media_info,
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#endif
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#ifdef CONFIG_TIPC_MEDIA_UDP
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&udp_media_info,
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#endif
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NULL
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};
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static struct tipc_bearer *bearer_get(struct net *net, int bearer_id)
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{
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struct tipc_net *tn = tipc_net(net);
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return rcu_dereference(tn->bearer_list[bearer_id]);
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}
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static void bearer_disable(struct net *net, struct tipc_bearer *b);
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static int tipc_l2_rcv_msg(struct sk_buff *skb, struct net_device *dev,
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struct packet_type *pt, struct net_device *orig_dev);
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/**
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* tipc_media_find - locates specified media object by name
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*/
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struct tipc_media *tipc_media_find(const char *name)
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{
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u32 i;
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for (i = 0; media_info_array[i] != NULL; i++) {
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if (!strcmp(media_info_array[i]->name, name))
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break;
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}
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return media_info_array[i];
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}
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/**
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* media_find_id - locates specified media object by type identifier
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*/
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static struct tipc_media *media_find_id(u8 type)
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{
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u32 i;
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for (i = 0; media_info_array[i] != NULL; i++) {
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if (media_info_array[i]->type_id == type)
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break;
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}
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return media_info_array[i];
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}
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/**
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* tipc_media_addr_printf - record media address in print buffer
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*/
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int tipc_media_addr_printf(char *buf, int len, struct tipc_media_addr *a)
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{
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char addr_str[MAX_ADDR_STR];
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struct tipc_media *m;
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int ret;
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m = media_find_id(a->media_id);
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if (m && !m->addr2str(a, addr_str, sizeof(addr_str)))
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ret = scnprintf(buf, len, "%s(%s)", m->name, addr_str);
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else {
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u32 i;
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ret = scnprintf(buf, len, "UNKNOWN(%u)", a->media_id);
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for (i = 0; i < sizeof(a->value); i++)
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ret += scnprintf(buf + ret, len - ret,
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"-%x", a->value[i]);
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}
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return ret;
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}
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/**
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* bearer_name_validate - validate & (optionally) deconstruct bearer name
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* @name: ptr to bearer name string
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* @name_parts: ptr to area for bearer name components (or NULL if not needed)
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*
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* Returns 1 if bearer name is valid, otherwise 0.
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*/
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static int bearer_name_validate(const char *name,
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struct tipc_bearer_names *name_parts)
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{
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char name_copy[TIPC_MAX_BEARER_NAME];
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char *media_name;
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char *if_name;
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u32 media_len;
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u32 if_len;
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/* copy bearer name & ensure length is OK */
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name_copy[TIPC_MAX_BEARER_NAME - 1] = 0;
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/* need above in case non-Posix strncpy() doesn't pad with nulls */
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strncpy(name_copy, name, TIPC_MAX_BEARER_NAME);
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if (name_copy[TIPC_MAX_BEARER_NAME - 1] != 0)
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return 0;
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/* ensure all component parts of bearer name are present */
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media_name = name_copy;
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if_name = strchr(media_name, ':');
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if (if_name == NULL)
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return 0;
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*(if_name++) = 0;
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media_len = if_name - media_name;
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if_len = strlen(if_name) + 1;
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/* validate component parts of bearer name */
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if ((media_len <= 1) || (media_len > TIPC_MAX_MEDIA_NAME) ||
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(if_len <= 1) || (if_len > TIPC_MAX_IF_NAME))
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return 0;
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/* return bearer name components, if necessary */
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if (name_parts) {
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strcpy(name_parts->media_name, media_name);
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strcpy(name_parts->if_name, if_name);
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}
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return 1;
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}
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/**
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* tipc_bearer_find - locates bearer object with matching bearer name
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*/
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struct tipc_bearer *tipc_bearer_find(struct net *net, const char *name)
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{
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struct tipc_net *tn = net_generic(net, tipc_net_id);
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struct tipc_bearer *b;
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u32 i;
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for (i = 0; i < MAX_BEARERS; i++) {
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b = rtnl_dereference(tn->bearer_list[i]);
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if (b && (!strcmp(b->name, name)))
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return b;
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}
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return NULL;
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}
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/* tipc_bearer_get_name - get the bearer name from its id.
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* @net: network namespace
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* @name: a pointer to the buffer where the name will be stored.
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* @bearer_id: the id to get the name from.
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*/
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int tipc_bearer_get_name(struct net *net, char *name, u32 bearer_id)
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{
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struct tipc_net *tn = tipc_net(net);
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struct tipc_bearer *b;
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if (bearer_id >= MAX_BEARERS)
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return -EINVAL;
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b = rtnl_dereference(tn->bearer_list[bearer_id]);
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if (!b)
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return -EINVAL;
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strcpy(name, b->name);
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return 0;
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}
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void tipc_bearer_add_dest(struct net *net, u32 bearer_id, u32 dest)
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{
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struct tipc_net *tn = net_generic(net, tipc_net_id);
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struct tipc_bearer *b;
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rcu_read_lock();
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b = rcu_dereference(tn->bearer_list[bearer_id]);
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if (b)
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tipc_disc_add_dest(b->disc);
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rcu_read_unlock();
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}
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void tipc_bearer_remove_dest(struct net *net, u32 bearer_id, u32 dest)
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{
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struct tipc_net *tn = net_generic(net, tipc_net_id);
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struct tipc_bearer *b;
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rcu_read_lock();
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b = rcu_dereference(tn->bearer_list[bearer_id]);
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if (b)
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tipc_disc_remove_dest(b->disc);
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rcu_read_unlock();
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}
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/**
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* tipc_enable_bearer - enable bearer with the given name
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*/
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static int tipc_enable_bearer(struct net *net, const char *name,
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u32 disc_domain, u32 prio,
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struct nlattr *attr[])
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{
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struct tipc_net *tn = tipc_net(net);
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struct tipc_bearer_names b_names;
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int with_this_prio = 1;
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struct tipc_bearer *b;
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struct tipc_media *m;
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struct sk_buff *skb;
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int bearer_id = 0;
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int res = -EINVAL;
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char *errstr = "";
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if (!bearer_name_validate(name, &b_names)) {
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errstr = "illegal name";
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goto rejected;
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}
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if (prio > TIPC_MAX_LINK_PRI && prio != TIPC_MEDIA_LINK_PRI) {
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errstr = "illegal priority";
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goto rejected;
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}
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m = tipc_media_find(b_names.media_name);
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if (!m) {
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errstr = "media not registered";
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goto rejected;
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}
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if (prio == TIPC_MEDIA_LINK_PRI)
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prio = m->priority;
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/* Check new bearer vs existing ones and find free bearer id if any */
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while (bearer_id < MAX_BEARERS) {
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b = rtnl_dereference(tn->bearer_list[bearer_id]);
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if (!b)
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break;
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if (!strcmp(name, b->name)) {
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errstr = "already enabled";
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goto rejected;
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}
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bearer_id++;
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if (b->priority != prio)
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continue;
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if (++with_this_prio <= 2)
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continue;
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pr_warn("Bearer <%s>: already 2 bearers with priority %u\n",
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name, prio);
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if (prio == TIPC_MIN_LINK_PRI) {
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errstr = "cannot adjust to lower";
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goto rejected;
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}
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pr_warn("Bearer <%s>: trying with adjusted priority\n", name);
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prio--;
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bearer_id = 0;
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with_this_prio = 1;
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}
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if (bearer_id >= MAX_BEARERS) {
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errstr = "max 3 bearers permitted";
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goto rejected;
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}
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b = kzalloc(sizeof(*b), GFP_ATOMIC);
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if (!b)
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return -ENOMEM;
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strcpy(b->name, name);
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b->media = m;
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res = m->enable_media(net, b, attr);
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if (res) {
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kfree(b);
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errstr = "failed to enable media";
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goto rejected;
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}
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b->identity = bearer_id;
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b->tolerance = m->tolerance;
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b->min_win = m->min_win;
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b->max_win = m->max_win;
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b->domain = disc_domain;
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b->net_plane = bearer_id + 'A';
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b->priority = prio;
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test_and_set_bit_lock(0, &b->up);
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refcount_set(&b->refcnt, 1);
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res = tipc_disc_create(net, b, &b->bcast_addr, &skb);
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if (res) {
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bearer_disable(net, b);
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errstr = "failed to create discoverer";
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goto rejected;
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}
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rcu_assign_pointer(tn->bearer_list[bearer_id], b);
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if (skb)
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tipc_bearer_xmit_skb(net, bearer_id, skb, &b->bcast_addr);
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if (tipc_mon_create(net, bearer_id)) {
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bearer_disable(net, b);
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return -ENOMEM;
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}
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pr_info("Enabled bearer <%s>, priority %u\n", name, prio);
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return res;
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rejected:
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pr_warn("Enabling of bearer <%s> rejected, %s\n", name, errstr);
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return res;
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}
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/**
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* tipc_reset_bearer - Reset all links established over this bearer
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*/
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static int tipc_reset_bearer(struct net *net, struct tipc_bearer *b)
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{
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pr_info("Resetting bearer <%s>\n", b->name);
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tipc_node_delete_links(net, b->identity);
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tipc_disc_reset(net, b);
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return 0;
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}
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bool tipc_bearer_hold(struct tipc_bearer *b)
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{
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return (b && refcount_inc_not_zero(&b->refcnt));
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}
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void tipc_bearer_put(struct tipc_bearer *b)
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{
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if (b && refcount_dec_and_test(&b->refcnt))
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kfree_rcu(b, rcu);
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}
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/**
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* bearer_disable
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*
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* Note: This routine assumes caller holds RTNL lock.
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*/
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static void bearer_disable(struct net *net, struct tipc_bearer *b)
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{
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struct tipc_net *tn = tipc_net(net);
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int bearer_id = b->identity;
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pr_info("Disabling bearer <%s>\n", b->name);
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clear_bit_unlock(0, &b->up);
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tipc_node_delete_links(net, bearer_id);
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b->media->disable_media(b);
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RCU_INIT_POINTER(b->media_ptr, NULL);
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if (b->disc)
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tipc_disc_delete(b->disc);
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RCU_INIT_POINTER(tn->bearer_list[bearer_id], NULL);
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tipc_bearer_put(b);
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tipc_mon_delete(net, bearer_id);
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}
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int tipc_enable_l2_media(struct net *net, struct tipc_bearer *b,
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struct nlattr *attr[])
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{
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char *dev_name = strchr((const char *)b->name, ':') + 1;
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int hwaddr_len = b->media->hwaddr_len;
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u8 node_id[NODE_ID_LEN] = {0,};
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struct net_device *dev;
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/* Find device with specified name */
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dev = dev_get_by_name(net, dev_name);
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if (!dev)
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return -ENODEV;
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if (tipc_mtu_bad(dev, 0)) {
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dev_put(dev);
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return -EINVAL;
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}
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if (dev == net->loopback_dev) {
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dev_put(dev);
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pr_info("Enabling <%s> not permitted\n", b->name);
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return -EINVAL;
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}
|
|
|
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/* Autoconfigure own node identity if needed */
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if (!tipc_own_id(net) && hwaddr_len <= NODE_ID_LEN) {
|
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memcpy(node_id, dev->dev_addr, hwaddr_len);
|
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tipc_net_init(net, node_id, 0);
|
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}
|
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if (!tipc_own_id(net)) {
|
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dev_put(dev);
|
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pr_warn("Failed to obtain node identity\n");
|
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return -EINVAL;
|
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}
|
|
|
|
/* Associate TIPC bearer with L2 bearer */
|
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rcu_assign_pointer(b->media_ptr, dev);
|
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b->pt.dev = dev;
|
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b->pt.type = htons(ETH_P_TIPC);
|
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b->pt.func = tipc_l2_rcv_msg;
|
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dev_add_pack(&b->pt);
|
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memset(&b->bcast_addr, 0, sizeof(b->bcast_addr));
|
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memcpy(b->bcast_addr.value, dev->broadcast, hwaddr_len);
|
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b->bcast_addr.media_id = b->media->type_id;
|
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b->bcast_addr.broadcast = TIPC_BROADCAST_SUPPORT;
|
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b->mtu = dev->mtu;
|
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b->media->raw2addr(b, &b->addr, (char *)dev->dev_addr);
|
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rcu_assign_pointer(dev->tipc_ptr, b);
|
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return 0;
|
|
}
|
|
|
|
/* tipc_disable_l2_media - detach TIPC bearer from an L2 interface
|
|
*
|
|
* Mark L2 bearer as inactive so that incoming buffers are thrown away
|
|
*/
|
|
void tipc_disable_l2_media(struct tipc_bearer *b)
|
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{
|
|
struct net_device *dev;
|
|
|
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dev = (struct net_device *)rtnl_dereference(b->media_ptr);
|
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dev_remove_pack(&b->pt);
|
|
RCU_INIT_POINTER(dev->tipc_ptr, NULL);
|
|
synchronize_net();
|
|
dev_put(dev);
|
|
}
|
|
|
|
/**
|
|
* tipc_l2_send_msg - send a TIPC packet out over an L2 interface
|
|
* @skb: the packet to be sent
|
|
* @b: the bearer through which the packet is to be sent
|
|
* @dest: peer destination address
|
|
*/
|
|
int tipc_l2_send_msg(struct net *net, struct sk_buff *skb,
|
|
struct tipc_bearer *b, struct tipc_media_addr *dest)
|
|
{
|
|
struct net_device *dev;
|
|
int delta;
|
|
|
|
dev = (struct net_device *)rcu_dereference(b->media_ptr);
|
|
if (!dev)
|
|
return 0;
|
|
|
|
delta = SKB_DATA_ALIGN(dev->hard_header_len - skb_headroom(skb));
|
|
if ((delta > 0) && pskb_expand_head(skb, delta, 0, GFP_ATOMIC)) {
|
|
kfree_skb(skb);
|
|
return 0;
|
|
}
|
|
skb_reset_network_header(skb);
|
|
skb->dev = dev;
|
|
skb->protocol = htons(ETH_P_TIPC);
|
|
dev_hard_header(skb, dev, ETH_P_TIPC, dest->value,
|
|
dev->dev_addr, skb->len);
|
|
dev_queue_xmit(skb);
|
|
return 0;
|
|
}
|
|
|
|
bool tipc_bearer_bcast_support(struct net *net, u32 bearer_id)
|
|
{
|
|
bool supp = false;
|
|
struct tipc_bearer *b;
|
|
|
|
rcu_read_lock();
|
|
b = bearer_get(net, bearer_id);
|
|
if (b)
|
|
supp = (b->bcast_addr.broadcast == TIPC_BROADCAST_SUPPORT);
|
|
rcu_read_unlock();
|
|
return supp;
|
|
}
|
|
|
|
int tipc_bearer_mtu(struct net *net, u32 bearer_id)
|
|
{
|
|
int mtu = 0;
|
|
struct tipc_bearer *b;
|
|
|
|
rcu_read_lock();
|
|
b = rcu_dereference(tipc_net(net)->bearer_list[bearer_id]);
|
|
if (b)
|
|
mtu = b->mtu;
|
|
rcu_read_unlock();
|
|
return mtu;
|
|
}
|
|
|
|
/* tipc_bearer_xmit_skb - sends buffer to destination over bearer
|
|
*/
|
|
void tipc_bearer_xmit_skb(struct net *net, u32 bearer_id,
|
|
struct sk_buff *skb,
|
|
struct tipc_media_addr *dest)
|
|
{
|
|
struct tipc_msg *hdr = buf_msg(skb);
|
|
struct tipc_bearer *b;
|
|
|
|
rcu_read_lock();
|
|
b = bearer_get(net, bearer_id);
|
|
if (likely(b && (test_bit(0, &b->up) || msg_is_reset(hdr)))) {
|
|
#ifdef CONFIG_TIPC_CRYPTO
|
|
tipc_crypto_xmit(net, &skb, b, dest, NULL);
|
|
if (skb)
|
|
#endif
|
|
b->media->send_msg(net, skb, b, dest);
|
|
} else {
|
|
kfree_skb(skb);
|
|
}
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
/* tipc_bearer_xmit() -send buffer to destination over bearer
|
|
*/
|
|
void tipc_bearer_xmit(struct net *net, u32 bearer_id,
|
|
struct sk_buff_head *xmitq,
|
|
struct tipc_media_addr *dst,
|
|
struct tipc_node *__dnode)
|
|
{
|
|
struct tipc_bearer *b;
|
|
struct sk_buff *skb, *tmp;
|
|
|
|
if (skb_queue_empty(xmitq))
|
|
return;
|
|
|
|
rcu_read_lock();
|
|
b = bearer_get(net, bearer_id);
|
|
if (unlikely(!b))
|
|
__skb_queue_purge(xmitq);
|
|
skb_queue_walk_safe(xmitq, skb, tmp) {
|
|
__skb_dequeue(xmitq);
|
|
if (likely(test_bit(0, &b->up) || msg_is_reset(buf_msg(skb)))) {
|
|
#ifdef CONFIG_TIPC_CRYPTO
|
|
tipc_crypto_xmit(net, &skb, b, dst, __dnode);
|
|
if (skb)
|
|
#endif
|
|
b->media->send_msg(net, skb, b, dst);
|
|
} else {
|
|
kfree_skb(skb);
|
|
}
|
|
}
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
/* tipc_bearer_bc_xmit() - broadcast buffers to all destinations
|
|
*/
|
|
void tipc_bearer_bc_xmit(struct net *net, u32 bearer_id,
|
|
struct sk_buff_head *xmitq)
|
|
{
|
|
struct tipc_net *tn = tipc_net(net);
|
|
struct tipc_media_addr *dst;
|
|
int net_id = tn->net_id;
|
|
struct tipc_bearer *b;
|
|
struct sk_buff *skb, *tmp;
|
|
struct tipc_msg *hdr;
|
|
|
|
rcu_read_lock();
|
|
b = bearer_get(net, bearer_id);
|
|
if (unlikely(!b || !test_bit(0, &b->up)))
|
|
__skb_queue_purge(xmitq);
|
|
skb_queue_walk_safe(xmitq, skb, tmp) {
|
|
hdr = buf_msg(skb);
|
|
msg_set_non_seq(hdr, 1);
|
|
msg_set_mc_netid(hdr, net_id);
|
|
__skb_dequeue(xmitq);
|
|
dst = &b->bcast_addr;
|
|
#ifdef CONFIG_TIPC_CRYPTO
|
|
tipc_crypto_xmit(net, &skb, b, dst, NULL);
|
|
if (skb)
|
|
#endif
|
|
b->media->send_msg(net, skb, b, dst);
|
|
}
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
/**
|
|
* tipc_l2_rcv_msg - handle incoming TIPC message from an interface
|
|
* @buf: the received packet
|
|
* @dev: the net device that the packet was received on
|
|
* @pt: the packet_type structure which was used to register this handler
|
|
* @orig_dev: the original receive net device in case the device is a bond
|
|
*
|
|
* Accept only packets explicitly sent to this node, or broadcast packets;
|
|
* ignores packets sent using interface multicast, and traffic sent to other
|
|
* nodes (which can happen if interface is running in promiscuous mode).
|
|
*/
|
|
static int tipc_l2_rcv_msg(struct sk_buff *skb, struct net_device *dev,
|
|
struct packet_type *pt, struct net_device *orig_dev)
|
|
{
|
|
struct tipc_bearer *b;
|
|
|
|
rcu_read_lock();
|
|
b = rcu_dereference(dev->tipc_ptr) ?:
|
|
rcu_dereference(orig_dev->tipc_ptr);
|
|
if (likely(b && test_bit(0, &b->up) &&
|
|
(skb->pkt_type <= PACKET_MULTICAST))) {
|
|
skb_mark_not_on_list(skb);
|
|
TIPC_SKB_CB(skb)->flags = 0;
|
|
tipc_rcv(dev_net(b->pt.dev), skb, b);
|
|
rcu_read_unlock();
|
|
return NET_RX_SUCCESS;
|
|
}
|
|
rcu_read_unlock();
|
|
kfree_skb(skb);
|
|
return NET_RX_DROP;
|
|
}
|
|
|
|
/**
|
|
* tipc_l2_device_event - handle device events from network device
|
|
* @nb: the context of the notification
|
|
* @evt: the type of event
|
|
* @ptr: the net device that the event was on
|
|
*
|
|
* This function is called by the Ethernet driver in case of link
|
|
* change event.
|
|
*/
|
|
static int tipc_l2_device_event(struct notifier_block *nb, unsigned long evt,
|
|
void *ptr)
|
|
{
|
|
struct net_device *dev = netdev_notifier_info_to_dev(ptr);
|
|
struct net *net = dev_net(dev);
|
|
struct tipc_bearer *b;
|
|
|
|
b = rtnl_dereference(dev->tipc_ptr);
|
|
if (!b)
|
|
return NOTIFY_DONE;
|
|
|
|
trace_tipc_l2_device_event(dev, b, evt);
|
|
switch (evt) {
|
|
case NETDEV_CHANGE:
|
|
if (netif_carrier_ok(dev) && netif_oper_up(dev)) {
|
|
test_and_set_bit_lock(0, &b->up);
|
|
break;
|
|
}
|
|
/* fall through */
|
|
case NETDEV_GOING_DOWN:
|
|
clear_bit_unlock(0, &b->up);
|
|
tipc_reset_bearer(net, b);
|
|
break;
|
|
case NETDEV_UP:
|
|
test_and_set_bit_lock(0, &b->up);
|
|
break;
|
|
case NETDEV_CHANGEMTU:
|
|
if (tipc_mtu_bad(dev, 0)) {
|
|
bearer_disable(net, b);
|
|
break;
|
|
}
|
|
b->mtu = dev->mtu;
|
|
tipc_reset_bearer(net, b);
|
|
break;
|
|
case NETDEV_CHANGEADDR:
|
|
b->media->raw2addr(b, &b->addr,
|
|
(char *)dev->dev_addr);
|
|
tipc_reset_bearer(net, b);
|
|
break;
|
|
case NETDEV_UNREGISTER:
|
|
case NETDEV_CHANGENAME:
|
|
bearer_disable(net, b);
|
|
break;
|
|
}
|
|
return NOTIFY_OK;
|
|
}
|
|
|
|
static struct notifier_block notifier = {
|
|
.notifier_call = tipc_l2_device_event,
|
|
.priority = 0,
|
|
};
|
|
|
|
int tipc_bearer_setup(void)
|
|
{
|
|
return register_netdevice_notifier(¬ifier);
|
|
}
|
|
|
|
void tipc_bearer_cleanup(void)
|
|
{
|
|
unregister_netdevice_notifier(¬ifier);
|
|
}
|
|
|
|
void tipc_bearer_stop(struct net *net)
|
|
{
|
|
struct tipc_net *tn = net_generic(net, tipc_net_id);
|
|
struct tipc_bearer *b;
|
|
u32 i;
|
|
|
|
for (i = 0; i < MAX_BEARERS; i++) {
|
|
b = rtnl_dereference(tn->bearer_list[i]);
|
|
if (b) {
|
|
bearer_disable(net, b);
|
|
tn->bearer_list[i] = NULL;
|
|
}
|
|
}
|
|
}
|
|
|
|
void tipc_clone_to_loopback(struct net *net, struct sk_buff_head *pkts)
|
|
{
|
|
struct net_device *dev = net->loopback_dev;
|
|
struct sk_buff *skb, *_skb;
|
|
int exp;
|
|
|
|
skb_queue_walk(pkts, _skb) {
|
|
skb = pskb_copy(_skb, GFP_ATOMIC);
|
|
if (!skb)
|
|
continue;
|
|
|
|
exp = SKB_DATA_ALIGN(dev->hard_header_len - skb_headroom(skb));
|
|
if (exp > 0 && pskb_expand_head(skb, exp, 0, GFP_ATOMIC)) {
|
|
kfree_skb(skb);
|
|
continue;
|
|
}
|
|
|
|
skb_reset_network_header(skb);
|
|
dev_hard_header(skb, dev, ETH_P_TIPC, dev->dev_addr,
|
|
dev->dev_addr, skb->len);
|
|
skb->dev = dev;
|
|
skb->pkt_type = PACKET_HOST;
|
|
skb->ip_summed = CHECKSUM_UNNECESSARY;
|
|
skb->protocol = eth_type_trans(skb, dev);
|
|
netif_rx_ni(skb);
|
|
}
|
|
}
|
|
|
|
static int tipc_loopback_rcv_pkt(struct sk_buff *skb, struct net_device *dev,
|
|
struct packet_type *pt, struct net_device *od)
|
|
{
|
|
consume_skb(skb);
|
|
return NET_RX_SUCCESS;
|
|
}
|
|
|
|
int tipc_attach_loopback(struct net *net)
|
|
{
|
|
struct net_device *dev = net->loopback_dev;
|
|
struct tipc_net *tn = tipc_net(net);
|
|
|
|
if (!dev)
|
|
return -ENODEV;
|
|
|
|
dev_hold(dev);
|
|
tn->loopback_pt.dev = dev;
|
|
tn->loopback_pt.type = htons(ETH_P_TIPC);
|
|
tn->loopback_pt.func = tipc_loopback_rcv_pkt;
|
|
dev_add_pack(&tn->loopback_pt);
|
|
return 0;
|
|
}
|
|
|
|
void tipc_detach_loopback(struct net *net)
|
|
{
|
|
struct tipc_net *tn = tipc_net(net);
|
|
|
|
dev_remove_pack(&tn->loopback_pt);
|
|
dev_put(net->loopback_dev);
|
|
}
|
|
|
|
/* Caller should hold rtnl_lock to protect the bearer */
|
|
static int __tipc_nl_add_bearer(struct tipc_nl_msg *msg,
|
|
struct tipc_bearer *bearer, int nlflags)
|
|
{
|
|
void *hdr;
|
|
struct nlattr *attrs;
|
|
struct nlattr *prop;
|
|
|
|
hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
|
|
nlflags, TIPC_NL_BEARER_GET);
|
|
if (!hdr)
|
|
return -EMSGSIZE;
|
|
|
|
attrs = nla_nest_start_noflag(msg->skb, TIPC_NLA_BEARER);
|
|
if (!attrs)
|
|
goto msg_full;
|
|
|
|
if (nla_put_string(msg->skb, TIPC_NLA_BEARER_NAME, bearer->name))
|
|
goto attr_msg_full;
|
|
|
|
prop = nla_nest_start_noflag(msg->skb, TIPC_NLA_BEARER_PROP);
|
|
if (!prop)
|
|
goto prop_msg_full;
|
|
if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, bearer->priority))
|
|
goto prop_msg_full;
|
|
if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, bearer->tolerance))
|
|
goto prop_msg_full;
|
|
if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, bearer->max_win))
|
|
goto prop_msg_full;
|
|
if (bearer->media->type_id == TIPC_MEDIA_TYPE_UDP)
|
|
if (nla_put_u32(msg->skb, TIPC_NLA_PROP_MTU, bearer->mtu))
|
|
goto prop_msg_full;
|
|
|
|
nla_nest_end(msg->skb, prop);
|
|
|
|
#ifdef CONFIG_TIPC_MEDIA_UDP
|
|
if (bearer->media->type_id == TIPC_MEDIA_TYPE_UDP) {
|
|
if (tipc_udp_nl_add_bearer_data(msg, bearer))
|
|
goto attr_msg_full;
|
|
}
|
|
#endif
|
|
|
|
nla_nest_end(msg->skb, attrs);
|
|
genlmsg_end(msg->skb, hdr);
|
|
|
|
return 0;
|
|
|
|
prop_msg_full:
|
|
nla_nest_cancel(msg->skb, prop);
|
|
attr_msg_full:
|
|
nla_nest_cancel(msg->skb, attrs);
|
|
msg_full:
|
|
genlmsg_cancel(msg->skb, hdr);
|
|
|
|
return -EMSGSIZE;
|
|
}
|
|
|
|
int tipc_nl_bearer_dump(struct sk_buff *skb, struct netlink_callback *cb)
|
|
{
|
|
int err;
|
|
int i = cb->args[0];
|
|
struct tipc_bearer *bearer;
|
|
struct tipc_nl_msg msg;
|
|
struct net *net = sock_net(skb->sk);
|
|
struct tipc_net *tn = net_generic(net, tipc_net_id);
|
|
|
|
if (i == MAX_BEARERS)
|
|
return 0;
|
|
|
|
msg.skb = skb;
|
|
msg.portid = NETLINK_CB(cb->skb).portid;
|
|
msg.seq = cb->nlh->nlmsg_seq;
|
|
|
|
rtnl_lock();
|
|
for (i = 0; i < MAX_BEARERS; i++) {
|
|
bearer = rtnl_dereference(tn->bearer_list[i]);
|
|
if (!bearer)
|
|
continue;
|
|
|
|
err = __tipc_nl_add_bearer(&msg, bearer, NLM_F_MULTI);
|
|
if (err)
|
|
break;
|
|
}
|
|
rtnl_unlock();
|
|
|
|
cb->args[0] = i;
|
|
return skb->len;
|
|
}
|
|
|
|
int tipc_nl_bearer_get(struct sk_buff *skb, struct genl_info *info)
|
|
{
|
|
int err;
|
|
char *name;
|
|
struct sk_buff *rep;
|
|
struct tipc_bearer *bearer;
|
|
struct tipc_nl_msg msg;
|
|
struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
|
|
struct net *net = genl_info_net(info);
|
|
|
|
if (!info->attrs[TIPC_NLA_BEARER])
|
|
return -EINVAL;
|
|
|
|
err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX,
|
|
info->attrs[TIPC_NLA_BEARER],
|
|
tipc_nl_bearer_policy, info->extack);
|
|
if (err)
|
|
return err;
|
|
|
|
if (!attrs[TIPC_NLA_BEARER_NAME])
|
|
return -EINVAL;
|
|
name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
|
|
|
|
rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
|
|
if (!rep)
|
|
return -ENOMEM;
|
|
|
|
msg.skb = rep;
|
|
msg.portid = info->snd_portid;
|
|
msg.seq = info->snd_seq;
|
|
|
|
rtnl_lock();
|
|
bearer = tipc_bearer_find(net, name);
|
|
if (!bearer) {
|
|
err = -EINVAL;
|
|
goto err_out;
|
|
}
|
|
|
|
err = __tipc_nl_add_bearer(&msg, bearer, 0);
|
|
if (err)
|
|
goto err_out;
|
|
rtnl_unlock();
|
|
|
|
return genlmsg_reply(rep, info);
|
|
err_out:
|
|
rtnl_unlock();
|
|
nlmsg_free(rep);
|
|
|
|
return err;
|
|
}
|
|
|
|
int __tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info)
|
|
{
|
|
int err;
|
|
char *name;
|
|
struct tipc_bearer *bearer;
|
|
struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
|
|
struct net *net = sock_net(skb->sk);
|
|
|
|
if (!info->attrs[TIPC_NLA_BEARER])
|
|
return -EINVAL;
|
|
|
|
err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX,
|
|
info->attrs[TIPC_NLA_BEARER],
|
|
tipc_nl_bearer_policy, info->extack);
|
|
if (err)
|
|
return err;
|
|
|
|
if (!attrs[TIPC_NLA_BEARER_NAME])
|
|
return -EINVAL;
|
|
|
|
name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
|
|
|
|
bearer = tipc_bearer_find(net, name);
|
|
if (!bearer)
|
|
return -EINVAL;
|
|
|
|
bearer_disable(net, bearer);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info)
|
|
{
|
|
int err;
|
|
|
|
rtnl_lock();
|
|
err = __tipc_nl_bearer_disable(skb, info);
|
|
rtnl_unlock();
|
|
|
|
return err;
|
|
}
|
|
|
|
int __tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info)
|
|
{
|
|
int err;
|
|
char *bearer;
|
|
struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
|
|
struct net *net = sock_net(skb->sk);
|
|
u32 domain = 0;
|
|
u32 prio;
|
|
|
|
prio = TIPC_MEDIA_LINK_PRI;
|
|
|
|
if (!info->attrs[TIPC_NLA_BEARER])
|
|
return -EINVAL;
|
|
|
|
err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX,
|
|
info->attrs[TIPC_NLA_BEARER],
|
|
tipc_nl_bearer_policy, info->extack);
|
|
if (err)
|
|
return err;
|
|
|
|
if (!attrs[TIPC_NLA_BEARER_NAME])
|
|
return -EINVAL;
|
|
|
|
bearer = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
|
|
|
|
if (attrs[TIPC_NLA_BEARER_DOMAIN])
|
|
domain = nla_get_u32(attrs[TIPC_NLA_BEARER_DOMAIN]);
|
|
|
|
if (attrs[TIPC_NLA_BEARER_PROP]) {
|
|
struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
|
|
|
|
err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP],
|
|
props);
|
|
if (err)
|
|
return err;
|
|
|
|
if (props[TIPC_NLA_PROP_PRIO])
|
|
prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
|
|
}
|
|
|
|
return tipc_enable_bearer(net, bearer, domain, prio, attrs);
|
|
}
|
|
|
|
int tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info)
|
|
{
|
|
int err;
|
|
|
|
rtnl_lock();
|
|
err = __tipc_nl_bearer_enable(skb, info);
|
|
rtnl_unlock();
|
|
|
|
return err;
|
|
}
|
|
|
|
int tipc_nl_bearer_add(struct sk_buff *skb, struct genl_info *info)
|
|
{
|
|
int err;
|
|
char *name;
|
|
struct tipc_bearer *b;
|
|
struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
|
|
struct net *net = sock_net(skb->sk);
|
|
|
|
if (!info->attrs[TIPC_NLA_BEARER])
|
|
return -EINVAL;
|
|
|
|
err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX,
|
|
info->attrs[TIPC_NLA_BEARER],
|
|
tipc_nl_bearer_policy, info->extack);
|
|
if (err)
|
|
return err;
|
|
|
|
if (!attrs[TIPC_NLA_BEARER_NAME])
|
|
return -EINVAL;
|
|
name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
|
|
|
|
rtnl_lock();
|
|
b = tipc_bearer_find(net, name);
|
|
if (!b) {
|
|
rtnl_unlock();
|
|
return -EINVAL;
|
|
}
|
|
|
|
#ifdef CONFIG_TIPC_MEDIA_UDP
|
|
if (attrs[TIPC_NLA_BEARER_UDP_OPTS]) {
|
|
err = tipc_udp_nl_bearer_add(b,
|
|
attrs[TIPC_NLA_BEARER_UDP_OPTS]);
|
|
if (err) {
|
|
rtnl_unlock();
|
|
return err;
|
|
}
|
|
}
|
|
#endif
|
|
rtnl_unlock();
|
|
|
|
return 0;
|
|
}
|
|
|
|
int __tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info)
|
|
{
|
|
struct tipc_bearer *b;
|
|
struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
|
|
struct net *net = sock_net(skb->sk);
|
|
char *name;
|
|
int err;
|
|
|
|
if (!info->attrs[TIPC_NLA_BEARER])
|
|
return -EINVAL;
|
|
|
|
err = nla_parse_nested_deprecated(attrs, TIPC_NLA_BEARER_MAX,
|
|
info->attrs[TIPC_NLA_BEARER],
|
|
tipc_nl_bearer_policy, info->extack);
|
|
if (err)
|
|
return err;
|
|
|
|
if (!attrs[TIPC_NLA_BEARER_NAME])
|
|
return -EINVAL;
|
|
name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
|
|
|
|
b = tipc_bearer_find(net, name);
|
|
if (!b)
|
|
return -EINVAL;
|
|
|
|
if (attrs[TIPC_NLA_BEARER_PROP]) {
|
|
struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
|
|
|
|
err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP],
|
|
props);
|
|
if (err)
|
|
return err;
|
|
|
|
if (props[TIPC_NLA_PROP_TOL]) {
|
|
b->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
|
|
tipc_node_apply_property(net, b, TIPC_NLA_PROP_TOL);
|
|
}
|
|
if (props[TIPC_NLA_PROP_PRIO])
|
|
b->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
|
|
if (props[TIPC_NLA_PROP_WIN])
|
|
b->max_win = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
|
|
if (props[TIPC_NLA_PROP_MTU]) {
|
|
if (b->media->type_id != TIPC_MEDIA_TYPE_UDP)
|
|
return -EINVAL;
|
|
#ifdef CONFIG_TIPC_MEDIA_UDP
|
|
if (tipc_udp_mtu_bad(nla_get_u32
|
|
(props[TIPC_NLA_PROP_MTU])))
|
|
return -EINVAL;
|
|
b->mtu = nla_get_u32(props[TIPC_NLA_PROP_MTU]);
|
|
tipc_node_apply_property(net, b, TIPC_NLA_PROP_MTU);
|
|
#endif
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info)
|
|
{
|
|
int err;
|
|
|
|
rtnl_lock();
|
|
err = __tipc_nl_bearer_set(skb, info);
|
|
rtnl_unlock();
|
|
|
|
return err;
|
|
}
|
|
|
|
static int __tipc_nl_add_media(struct tipc_nl_msg *msg,
|
|
struct tipc_media *media, int nlflags)
|
|
{
|
|
void *hdr;
|
|
struct nlattr *attrs;
|
|
struct nlattr *prop;
|
|
|
|
hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
|
|
nlflags, TIPC_NL_MEDIA_GET);
|
|
if (!hdr)
|
|
return -EMSGSIZE;
|
|
|
|
attrs = nla_nest_start_noflag(msg->skb, TIPC_NLA_MEDIA);
|
|
if (!attrs)
|
|
goto msg_full;
|
|
|
|
if (nla_put_string(msg->skb, TIPC_NLA_MEDIA_NAME, media->name))
|
|
goto attr_msg_full;
|
|
|
|
prop = nla_nest_start_noflag(msg->skb, TIPC_NLA_MEDIA_PROP);
|
|
if (!prop)
|
|
goto prop_msg_full;
|
|
if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, media->priority))
|
|
goto prop_msg_full;
|
|
if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, media->tolerance))
|
|
goto prop_msg_full;
|
|
if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, media->max_win))
|
|
goto prop_msg_full;
|
|
if (media->type_id == TIPC_MEDIA_TYPE_UDP)
|
|
if (nla_put_u32(msg->skb, TIPC_NLA_PROP_MTU, media->mtu))
|
|
goto prop_msg_full;
|
|
|
|
nla_nest_end(msg->skb, prop);
|
|
nla_nest_end(msg->skb, attrs);
|
|
genlmsg_end(msg->skb, hdr);
|
|
|
|
return 0;
|
|
|
|
prop_msg_full:
|
|
nla_nest_cancel(msg->skb, prop);
|
|
attr_msg_full:
|
|
nla_nest_cancel(msg->skb, attrs);
|
|
msg_full:
|
|
genlmsg_cancel(msg->skb, hdr);
|
|
|
|
return -EMSGSIZE;
|
|
}
|
|
|
|
int tipc_nl_media_dump(struct sk_buff *skb, struct netlink_callback *cb)
|
|
{
|
|
int err;
|
|
int i = cb->args[0];
|
|
struct tipc_nl_msg msg;
|
|
|
|
if (i == MAX_MEDIA)
|
|
return 0;
|
|
|
|
msg.skb = skb;
|
|
msg.portid = NETLINK_CB(cb->skb).portid;
|
|
msg.seq = cb->nlh->nlmsg_seq;
|
|
|
|
rtnl_lock();
|
|
for (; media_info_array[i] != NULL; i++) {
|
|
err = __tipc_nl_add_media(&msg, media_info_array[i],
|
|
NLM_F_MULTI);
|
|
if (err)
|
|
break;
|
|
}
|
|
rtnl_unlock();
|
|
|
|
cb->args[0] = i;
|
|
return skb->len;
|
|
}
|
|
|
|
int tipc_nl_media_get(struct sk_buff *skb, struct genl_info *info)
|
|
{
|
|
int err;
|
|
char *name;
|
|
struct tipc_nl_msg msg;
|
|
struct tipc_media *media;
|
|
struct sk_buff *rep;
|
|
struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
|
|
|
|
if (!info->attrs[TIPC_NLA_MEDIA])
|
|
return -EINVAL;
|
|
|
|
err = nla_parse_nested_deprecated(attrs, TIPC_NLA_MEDIA_MAX,
|
|
info->attrs[TIPC_NLA_MEDIA],
|
|
tipc_nl_media_policy, info->extack);
|
|
if (err)
|
|
return err;
|
|
|
|
if (!attrs[TIPC_NLA_MEDIA_NAME])
|
|
return -EINVAL;
|
|
name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]);
|
|
|
|
rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
|
|
if (!rep)
|
|
return -ENOMEM;
|
|
|
|
msg.skb = rep;
|
|
msg.portid = info->snd_portid;
|
|
msg.seq = info->snd_seq;
|
|
|
|
rtnl_lock();
|
|
media = tipc_media_find(name);
|
|
if (!media) {
|
|
err = -EINVAL;
|
|
goto err_out;
|
|
}
|
|
|
|
err = __tipc_nl_add_media(&msg, media, 0);
|
|
if (err)
|
|
goto err_out;
|
|
rtnl_unlock();
|
|
|
|
return genlmsg_reply(rep, info);
|
|
err_out:
|
|
rtnl_unlock();
|
|
nlmsg_free(rep);
|
|
|
|
return err;
|
|
}
|
|
|
|
int __tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info)
|
|
{
|
|
int err;
|
|
char *name;
|
|
struct tipc_media *m;
|
|
struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
|
|
|
|
if (!info->attrs[TIPC_NLA_MEDIA])
|
|
return -EINVAL;
|
|
|
|
err = nla_parse_nested_deprecated(attrs, TIPC_NLA_MEDIA_MAX,
|
|
info->attrs[TIPC_NLA_MEDIA],
|
|
tipc_nl_media_policy, info->extack);
|
|
|
|
if (!attrs[TIPC_NLA_MEDIA_NAME])
|
|
return -EINVAL;
|
|
name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]);
|
|
|
|
m = tipc_media_find(name);
|
|
if (!m)
|
|
return -EINVAL;
|
|
|
|
if (attrs[TIPC_NLA_MEDIA_PROP]) {
|
|
struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
|
|
|
|
err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_MEDIA_PROP],
|
|
props);
|
|
if (err)
|
|
return err;
|
|
|
|
if (props[TIPC_NLA_PROP_TOL])
|
|
m->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
|
|
if (props[TIPC_NLA_PROP_PRIO])
|
|
m->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
|
|
if (props[TIPC_NLA_PROP_WIN])
|
|
m->max_win = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
|
|
if (props[TIPC_NLA_PROP_MTU]) {
|
|
if (m->type_id != TIPC_MEDIA_TYPE_UDP)
|
|
return -EINVAL;
|
|
#ifdef CONFIG_TIPC_MEDIA_UDP
|
|
if (tipc_udp_mtu_bad(nla_get_u32
|
|
(props[TIPC_NLA_PROP_MTU])))
|
|
return -EINVAL;
|
|
m->mtu = nla_get_u32(props[TIPC_NLA_PROP_MTU]);
|
|
#endif
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info)
|
|
{
|
|
int err;
|
|
|
|
rtnl_lock();
|
|
err = __tipc_nl_media_set(skb, info);
|
|
rtnl_unlock();
|
|
|
|
return err;
|
|
}
|