![Ying Xue](/assets/img/avatar_default.png)
[ Upstream commit 94f6a80c0c
]
When we get link properties through netlink interface with
tipc_nl_node_get_link(), we don't validate TIPC_NLA_LINK_NAME
attribute at all, instead we directly use it. As a consequence,
KMSAN detected the TIPC_NLA_LINK_NAME attribute was an uninitialized
value, and then posted the following complaint:
==================================================================
BUG: KMSAN: uninit-value in strcmp+0xf7/0x160 lib/string.c:329
CPU: 1 PID: 4527 Comm: syz-executor655 Not tainted 4.16.0+ #87
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:17 [inline]
dump_stack+0x185/0x1d0 lib/dump_stack.c:53
kmsan_report+0x142/0x240 mm/kmsan/kmsan.c:1067
__msan_warning_32+0x6c/0xb0 mm/kmsan/kmsan_instr.c:683
strcmp+0xf7/0x160 lib/string.c:329
tipc_nl_node_get_link+0x220/0x6f0 net/tipc/node.c:1881
genl_family_rcv_msg net/netlink/genetlink.c:599 [inline]
genl_rcv_msg+0x1686/0x1810 net/netlink/genetlink.c:624
netlink_rcv_skb+0x378/0x600 net/netlink/af_netlink.c:2447
genl_rcv+0x63/0x80 net/netlink/genetlink.c:635
netlink_unicast_kernel net/netlink/af_netlink.c:1311 [inline]
netlink_unicast+0x166b/0x1740 net/netlink/af_netlink.c:1337
netlink_sendmsg+0x1048/0x1310 net/netlink/af_netlink.c:1900
sock_sendmsg_nosec net/socket.c:630 [inline]
sock_sendmsg net/socket.c:640 [inline]
___sys_sendmsg+0xec0/0x1310 net/socket.c:2046
__sys_sendmsg net/socket.c:2080 [inline]
SYSC_sendmsg+0x2a3/0x3d0 net/socket.c:2091
SyS_sendmsg+0x54/0x80 net/socket.c:2087
do_syscall_64+0x309/0x430 arch/x86/entry/common.c:287
entry_SYSCALL_64_after_hwframe+0x3d/0xa2
RIP: 0033:0x445589
RSP: 002b:00007fb7ee66cdb8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00000000006dac24 RCX: 0000000000445589
RDX: 0000000000000000 RSI: 0000000020023000 RDI: 0000000000000003
RBP: 00000000006dac20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fffa2bf3f3f R14: 00007fb7ee66d9c0 R15: 0000000000000001
Uninit was created at:
kmsan_save_stack_with_flags mm/kmsan/kmsan.c:278 [inline]
kmsan_internal_poison_shadow+0xb8/0x1b0 mm/kmsan/kmsan.c:188
kmsan_kmalloc+0x94/0x100 mm/kmsan/kmsan.c:314
kmsan_slab_alloc+0x11/0x20 mm/kmsan/kmsan.c:321
slab_post_alloc_hook mm/slab.h:445 [inline]
slab_alloc_node mm/slub.c:2737 [inline]
__kmalloc_node_track_caller+0xaed/0x11c0 mm/slub.c:4369
__kmalloc_reserve net/core/skbuff.c:138 [inline]
__alloc_skb+0x2cf/0x9f0 net/core/skbuff.c:206
alloc_skb include/linux/skbuff.h:984 [inline]
netlink_alloc_large_skb net/netlink/af_netlink.c:1183 [inline]
netlink_sendmsg+0x9a6/0x1310 net/netlink/af_netlink.c:1875
sock_sendmsg_nosec net/socket.c:630 [inline]
sock_sendmsg net/socket.c:640 [inline]
___sys_sendmsg+0xec0/0x1310 net/socket.c:2046
__sys_sendmsg net/socket.c:2080 [inline]
SYSC_sendmsg+0x2a3/0x3d0 net/socket.c:2091
SyS_sendmsg+0x54/0x80 net/socket.c:2087
do_syscall_64+0x309/0x430 arch/x86/entry/common.c:287
entry_SYSCALL_64_after_hwframe+0x3d/0xa2
==================================================================
To quiet the complaint, TIPC_NLA_LINK_NAME attribute has been
validated in tipc_nl_node_get_link() before it's used.
Reported-by: syzbot+df0257c92ffd4fcc58cd@syzkaller.appspotmail.com
Signed-off-by: Ying Xue <ying.xue@windriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2204 lines
54 KiB
C
2204 lines
54 KiB
C
/*
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* net/tipc/node.c: TIPC node management routines
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*
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* Copyright (c) 2000-2006, 2012-2016, Ericsson AB
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* Copyright (c) 2005-2006, 2010-2014, 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 "core.h"
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#include "link.h"
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#include "node.h"
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#include "name_distr.h"
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#include "socket.h"
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#include "bcast.h"
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#include "monitor.h"
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#include "discover.h"
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#include "netlink.h"
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#define INVALID_NODE_SIG 0x10000
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/* Flags used to take different actions according to flag type
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* TIPC_NOTIFY_NODE_DOWN: notify node is down
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* TIPC_NOTIFY_NODE_UP: notify node is up
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* TIPC_DISTRIBUTE_NAME: publish or withdraw link state name type
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*/
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enum {
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TIPC_NOTIFY_NODE_DOWN = (1 << 3),
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TIPC_NOTIFY_NODE_UP = (1 << 4),
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TIPC_NOTIFY_LINK_UP = (1 << 6),
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TIPC_NOTIFY_LINK_DOWN = (1 << 7)
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};
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struct tipc_link_entry {
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struct tipc_link *link;
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spinlock_t lock; /* per link */
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u32 mtu;
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struct sk_buff_head inputq;
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struct tipc_media_addr maddr;
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};
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struct tipc_bclink_entry {
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struct tipc_link *link;
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struct sk_buff_head inputq1;
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struct sk_buff_head arrvq;
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struct sk_buff_head inputq2;
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struct sk_buff_head namedq;
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};
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/**
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* struct tipc_node - TIPC node structure
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* @addr: network address of node
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* @ref: reference counter to node object
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* @lock: rwlock governing access to structure
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* @net: the applicable net namespace
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* @hash: links to adjacent nodes in unsorted hash chain
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* @inputq: pointer to input queue containing messages for msg event
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* @namedq: pointer to name table input queue with name table messages
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* @active_links: bearer ids of active links, used as index into links[] array
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* @links: array containing references to all links to node
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* @action_flags: bit mask of different types of node actions
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* @state: connectivity state vs peer node
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* @sync_point: sequence number where synch/failover is finished
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* @list: links to adjacent nodes in sorted list of cluster's nodes
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* @working_links: number of working links to node (both active and standby)
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* @link_cnt: number of links to node
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* @capabilities: bitmap, indicating peer node's functional capabilities
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* @signature: node instance identifier
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* @link_id: local and remote bearer ids of changing link, if any
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* @publ_list: list of publications
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* @rcu: rcu struct for tipc_node
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*/
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struct tipc_node {
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u32 addr;
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struct kref kref;
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rwlock_t lock;
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struct net *net;
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struct hlist_node hash;
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int active_links[2];
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struct tipc_link_entry links[MAX_BEARERS];
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struct tipc_bclink_entry bc_entry;
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int action_flags;
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struct list_head list;
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int state;
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u16 sync_point;
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int link_cnt;
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u16 working_links;
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u16 capabilities;
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u32 signature;
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u32 link_id;
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struct list_head publ_list;
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struct list_head conn_sks;
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unsigned long keepalive_intv;
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struct timer_list timer;
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struct rcu_head rcu;
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};
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/* Node FSM states and events:
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*/
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enum {
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SELF_DOWN_PEER_DOWN = 0xdd,
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SELF_UP_PEER_UP = 0xaa,
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SELF_DOWN_PEER_LEAVING = 0xd1,
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SELF_UP_PEER_COMING = 0xac,
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SELF_COMING_PEER_UP = 0xca,
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SELF_LEAVING_PEER_DOWN = 0x1d,
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NODE_FAILINGOVER = 0xf0,
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NODE_SYNCHING = 0xcc
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};
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enum {
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SELF_ESTABL_CONTACT_EVT = 0xece,
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SELF_LOST_CONTACT_EVT = 0x1ce,
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PEER_ESTABL_CONTACT_EVT = 0x9ece,
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PEER_LOST_CONTACT_EVT = 0x91ce,
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NODE_FAILOVER_BEGIN_EVT = 0xfbe,
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NODE_FAILOVER_END_EVT = 0xfee,
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NODE_SYNCH_BEGIN_EVT = 0xcbe,
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NODE_SYNCH_END_EVT = 0xcee
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};
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static void __tipc_node_link_down(struct tipc_node *n, int *bearer_id,
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struct sk_buff_head *xmitq,
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struct tipc_media_addr **maddr);
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static void tipc_node_link_down(struct tipc_node *n, int bearer_id,
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bool delete);
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static void node_lost_contact(struct tipc_node *n, struct sk_buff_head *inputq);
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static void tipc_node_delete(struct tipc_node *node);
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static void tipc_node_timeout(unsigned long data);
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static void tipc_node_fsm_evt(struct tipc_node *n, int evt);
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static struct tipc_node *tipc_node_find(struct net *net, u32 addr);
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static void tipc_node_put(struct tipc_node *node);
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static bool tipc_node_is_up(struct tipc_node *n);
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struct tipc_sock_conn {
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u32 port;
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u32 peer_port;
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u32 peer_node;
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struct list_head list;
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};
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static struct tipc_link *node_active_link(struct tipc_node *n, int sel)
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{
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int bearer_id = n->active_links[sel & 1];
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if (unlikely(bearer_id == INVALID_BEARER_ID))
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return NULL;
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return n->links[bearer_id].link;
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}
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int tipc_node_get_mtu(struct net *net, u32 addr, u32 sel)
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{
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struct tipc_node *n;
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int bearer_id;
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unsigned int mtu = MAX_MSG_SIZE;
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n = tipc_node_find(net, addr);
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if (unlikely(!n))
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return mtu;
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bearer_id = n->active_links[sel & 1];
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if (likely(bearer_id != INVALID_BEARER_ID))
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mtu = n->links[bearer_id].mtu;
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tipc_node_put(n);
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return mtu;
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}
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u16 tipc_node_get_capabilities(struct net *net, u32 addr)
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{
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struct tipc_node *n;
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u16 caps;
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n = tipc_node_find(net, addr);
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if (unlikely(!n))
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return TIPC_NODE_CAPABILITIES;
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caps = n->capabilities;
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tipc_node_put(n);
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return caps;
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}
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static void tipc_node_kref_release(struct kref *kref)
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{
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struct tipc_node *n = container_of(kref, struct tipc_node, kref);
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kfree(n->bc_entry.link);
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kfree_rcu(n, rcu);
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}
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static void tipc_node_put(struct tipc_node *node)
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{
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kref_put(&node->kref, tipc_node_kref_release);
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}
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static void tipc_node_get(struct tipc_node *node)
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{
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kref_get(&node->kref);
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}
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/*
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* tipc_node_find - locate specified node object, if it exists
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*/
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static struct tipc_node *tipc_node_find(struct net *net, u32 addr)
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{
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struct tipc_net *tn = tipc_net(net);
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struct tipc_node *node;
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unsigned int thash = tipc_hashfn(addr);
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if (unlikely(!in_own_cluster_exact(net, addr)))
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return NULL;
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rcu_read_lock();
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hlist_for_each_entry_rcu(node, &tn->node_htable[thash], hash) {
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if (node->addr != addr)
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continue;
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if (!kref_get_unless_zero(&node->kref))
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node = NULL;
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break;
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}
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rcu_read_unlock();
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return node;
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}
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static void tipc_node_read_lock(struct tipc_node *n)
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{
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read_lock_bh(&n->lock);
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}
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static void tipc_node_read_unlock(struct tipc_node *n)
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{
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read_unlock_bh(&n->lock);
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}
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static void tipc_node_write_lock(struct tipc_node *n)
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{
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write_lock_bh(&n->lock);
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}
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static void tipc_node_write_unlock_fast(struct tipc_node *n)
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{
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write_unlock_bh(&n->lock);
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}
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static void tipc_node_write_unlock(struct tipc_node *n)
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{
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struct net *net = n->net;
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u32 addr = 0;
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u32 flags = n->action_flags;
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u32 link_id = 0;
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u32 bearer_id;
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struct list_head *publ_list;
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if (likely(!flags)) {
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write_unlock_bh(&n->lock);
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return;
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}
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addr = n->addr;
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link_id = n->link_id;
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bearer_id = link_id & 0xffff;
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publ_list = &n->publ_list;
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n->action_flags &= ~(TIPC_NOTIFY_NODE_DOWN | TIPC_NOTIFY_NODE_UP |
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TIPC_NOTIFY_LINK_DOWN | TIPC_NOTIFY_LINK_UP);
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write_unlock_bh(&n->lock);
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if (flags & TIPC_NOTIFY_NODE_DOWN)
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tipc_publ_notify(net, publ_list, addr);
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if (flags & TIPC_NOTIFY_NODE_UP)
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tipc_named_node_up(net, addr);
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if (flags & TIPC_NOTIFY_LINK_UP) {
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tipc_mon_peer_up(net, addr, bearer_id);
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tipc_nametbl_publish(net, TIPC_LINK_STATE, addr, addr,
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TIPC_NODE_SCOPE, link_id, addr);
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}
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if (flags & TIPC_NOTIFY_LINK_DOWN) {
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tipc_mon_peer_down(net, addr, bearer_id);
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tipc_nametbl_withdraw(net, TIPC_LINK_STATE, addr,
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link_id, addr);
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}
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}
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struct tipc_node *tipc_node_create(struct net *net, u32 addr, u16 capabilities)
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{
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struct tipc_net *tn = net_generic(net, tipc_net_id);
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struct tipc_node *n, *temp_node;
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int i;
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spin_lock_bh(&tn->node_list_lock);
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n = tipc_node_find(net, addr);
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if (n) {
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/* Same node may come back with new capabilities */
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n->capabilities = capabilities;
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goto exit;
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}
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n = kzalloc(sizeof(*n), GFP_ATOMIC);
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if (!n) {
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pr_warn("Node creation failed, no memory\n");
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goto exit;
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}
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n->addr = addr;
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n->net = net;
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n->capabilities = capabilities;
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kref_init(&n->kref);
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rwlock_init(&n->lock);
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INIT_HLIST_NODE(&n->hash);
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INIT_LIST_HEAD(&n->list);
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INIT_LIST_HEAD(&n->publ_list);
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INIT_LIST_HEAD(&n->conn_sks);
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skb_queue_head_init(&n->bc_entry.namedq);
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skb_queue_head_init(&n->bc_entry.inputq1);
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__skb_queue_head_init(&n->bc_entry.arrvq);
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skb_queue_head_init(&n->bc_entry.inputq2);
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for (i = 0; i < MAX_BEARERS; i++)
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spin_lock_init(&n->links[i].lock);
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n->state = SELF_DOWN_PEER_LEAVING;
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n->signature = INVALID_NODE_SIG;
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n->active_links[0] = INVALID_BEARER_ID;
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n->active_links[1] = INVALID_BEARER_ID;
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if (!tipc_link_bc_create(net, tipc_own_addr(net), n->addr,
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U16_MAX,
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tipc_link_window(tipc_bc_sndlink(net)),
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n->capabilities,
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&n->bc_entry.inputq1,
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&n->bc_entry.namedq,
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tipc_bc_sndlink(net),
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&n->bc_entry.link)) {
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pr_warn("Broadcast rcv link creation failed, no memory\n");
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kfree(n);
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n = NULL;
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goto exit;
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}
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tipc_node_get(n);
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setup_timer(&n->timer, tipc_node_timeout, (unsigned long)n);
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n->keepalive_intv = U32_MAX;
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hlist_add_head_rcu(&n->hash, &tn->node_htable[tipc_hashfn(addr)]);
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list_for_each_entry_rcu(temp_node, &tn->node_list, list) {
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if (n->addr < temp_node->addr)
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break;
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}
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list_add_tail_rcu(&n->list, &temp_node->list);
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exit:
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spin_unlock_bh(&tn->node_list_lock);
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return n;
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}
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static void tipc_node_calculate_timer(struct tipc_node *n, struct tipc_link *l)
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{
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unsigned long tol = tipc_link_tolerance(l);
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unsigned long intv = ((tol / 4) > 500) ? 500 : tol / 4;
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/* Link with lowest tolerance determines timer interval */
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if (intv < n->keepalive_intv)
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n->keepalive_intv = intv;
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/* Ensure link's abort limit corresponds to current tolerance */
|
|
tipc_link_set_abort_limit(l, tol / n->keepalive_intv);
|
|
}
|
|
|
|
static void tipc_node_delete(struct tipc_node *node)
|
|
{
|
|
list_del_rcu(&node->list);
|
|
hlist_del_rcu(&node->hash);
|
|
tipc_node_put(node);
|
|
|
|
del_timer_sync(&node->timer);
|
|
tipc_node_put(node);
|
|
}
|
|
|
|
void tipc_node_stop(struct net *net)
|
|
{
|
|
struct tipc_net *tn = tipc_net(net);
|
|
struct tipc_node *node, *t_node;
|
|
|
|
spin_lock_bh(&tn->node_list_lock);
|
|
list_for_each_entry_safe(node, t_node, &tn->node_list, list)
|
|
tipc_node_delete(node);
|
|
spin_unlock_bh(&tn->node_list_lock);
|
|
}
|
|
|
|
void tipc_node_subscribe(struct net *net, struct list_head *subscr, u32 addr)
|
|
{
|
|
struct tipc_node *n;
|
|
|
|
if (in_own_node(net, addr))
|
|
return;
|
|
|
|
n = tipc_node_find(net, addr);
|
|
if (!n) {
|
|
pr_warn("Node subscribe rejected, unknown node 0x%x\n", addr);
|
|
return;
|
|
}
|
|
tipc_node_write_lock(n);
|
|
list_add_tail(subscr, &n->publ_list);
|
|
tipc_node_write_unlock_fast(n);
|
|
tipc_node_put(n);
|
|
}
|
|
|
|
void tipc_node_unsubscribe(struct net *net, struct list_head *subscr, u32 addr)
|
|
{
|
|
struct tipc_node *n;
|
|
|
|
if (in_own_node(net, addr))
|
|
return;
|
|
|
|
n = tipc_node_find(net, addr);
|
|
if (!n) {
|
|
pr_warn("Node unsubscribe rejected, unknown node 0x%x\n", addr);
|
|
return;
|
|
}
|
|
tipc_node_write_lock(n);
|
|
list_del_init(subscr);
|
|
tipc_node_write_unlock_fast(n);
|
|
tipc_node_put(n);
|
|
}
|
|
|
|
int tipc_node_add_conn(struct net *net, u32 dnode, u32 port, u32 peer_port)
|
|
{
|
|
struct tipc_node *node;
|
|
struct tipc_sock_conn *conn;
|
|
int err = 0;
|
|
|
|
if (in_own_node(net, dnode))
|
|
return 0;
|
|
|
|
node = tipc_node_find(net, dnode);
|
|
if (!node) {
|
|
pr_warn("Connecting sock to node 0x%x failed\n", dnode);
|
|
return -EHOSTUNREACH;
|
|
}
|
|
conn = kmalloc(sizeof(*conn), GFP_ATOMIC);
|
|
if (!conn) {
|
|
err = -EHOSTUNREACH;
|
|
goto exit;
|
|
}
|
|
conn->peer_node = dnode;
|
|
conn->port = port;
|
|
conn->peer_port = peer_port;
|
|
|
|
tipc_node_write_lock(node);
|
|
list_add_tail(&conn->list, &node->conn_sks);
|
|
tipc_node_write_unlock(node);
|
|
exit:
|
|
tipc_node_put(node);
|
|
return err;
|
|
}
|
|
|
|
void tipc_node_remove_conn(struct net *net, u32 dnode, u32 port)
|
|
{
|
|
struct tipc_node *node;
|
|
struct tipc_sock_conn *conn, *safe;
|
|
|
|
if (in_own_node(net, dnode))
|
|
return;
|
|
|
|
node = tipc_node_find(net, dnode);
|
|
if (!node)
|
|
return;
|
|
|
|
tipc_node_write_lock(node);
|
|
list_for_each_entry_safe(conn, safe, &node->conn_sks, list) {
|
|
if (port != conn->port)
|
|
continue;
|
|
list_del(&conn->list);
|
|
kfree(conn);
|
|
}
|
|
tipc_node_write_unlock(node);
|
|
tipc_node_put(node);
|
|
}
|
|
|
|
/* tipc_node_timeout - handle expiration of node timer
|
|
*/
|
|
static void tipc_node_timeout(unsigned long data)
|
|
{
|
|
struct tipc_node *n = (struct tipc_node *)data;
|
|
struct tipc_link_entry *le;
|
|
struct sk_buff_head xmitq;
|
|
int bearer_id;
|
|
int rc = 0;
|
|
|
|
__skb_queue_head_init(&xmitq);
|
|
|
|
for (bearer_id = 0; bearer_id < MAX_BEARERS; bearer_id++) {
|
|
tipc_node_read_lock(n);
|
|
le = &n->links[bearer_id];
|
|
spin_lock_bh(&le->lock);
|
|
if (le->link) {
|
|
/* Link tolerance may change asynchronously: */
|
|
tipc_node_calculate_timer(n, le->link);
|
|
rc = tipc_link_timeout(le->link, &xmitq);
|
|
}
|
|
spin_unlock_bh(&le->lock);
|
|
tipc_node_read_unlock(n);
|
|
tipc_bearer_xmit(n->net, bearer_id, &xmitq, &le->maddr);
|
|
if (rc & TIPC_LINK_DOWN_EVT)
|
|
tipc_node_link_down(n, bearer_id, false);
|
|
}
|
|
mod_timer(&n->timer, jiffies + msecs_to_jiffies(n->keepalive_intv));
|
|
}
|
|
|
|
/**
|
|
* __tipc_node_link_up - handle addition of link
|
|
* Node lock must be held by caller
|
|
* Link becomes active (alone or shared) or standby, depending on its priority.
|
|
*/
|
|
static void __tipc_node_link_up(struct tipc_node *n, int bearer_id,
|
|
struct sk_buff_head *xmitq)
|
|
{
|
|
int *slot0 = &n->active_links[0];
|
|
int *slot1 = &n->active_links[1];
|
|
struct tipc_link *ol = node_active_link(n, 0);
|
|
struct tipc_link *nl = n->links[bearer_id].link;
|
|
|
|
if (!nl || tipc_link_is_up(nl))
|
|
return;
|
|
|
|
tipc_link_fsm_evt(nl, LINK_ESTABLISH_EVT);
|
|
if (!tipc_link_is_up(nl))
|
|
return;
|
|
|
|
n->working_links++;
|
|
n->action_flags |= TIPC_NOTIFY_LINK_UP;
|
|
n->link_id = tipc_link_id(nl);
|
|
|
|
/* Leave room for tunnel header when returning 'mtu' to users: */
|
|
n->links[bearer_id].mtu = tipc_link_mtu(nl) - INT_H_SIZE;
|
|
|
|
tipc_bearer_add_dest(n->net, bearer_id, n->addr);
|
|
tipc_bcast_inc_bearer_dst_cnt(n->net, bearer_id);
|
|
|
|
pr_debug("Established link <%s> on network plane %c\n",
|
|
tipc_link_name(nl), tipc_link_plane(nl));
|
|
|
|
/* Ensure that a STATE message goes first */
|
|
tipc_link_build_state_msg(nl, xmitq);
|
|
|
|
/* First link? => give it both slots */
|
|
if (!ol) {
|
|
*slot0 = bearer_id;
|
|
*slot1 = bearer_id;
|
|
tipc_node_fsm_evt(n, SELF_ESTABL_CONTACT_EVT);
|
|
n->action_flags |= TIPC_NOTIFY_NODE_UP;
|
|
tipc_link_set_active(nl, true);
|
|
tipc_bcast_add_peer(n->net, nl, xmitq);
|
|
return;
|
|
}
|
|
|
|
/* Second link => redistribute slots */
|
|
if (tipc_link_prio(nl) > tipc_link_prio(ol)) {
|
|
pr_debug("Old link <%s> becomes standby\n", tipc_link_name(ol));
|
|
*slot0 = bearer_id;
|
|
*slot1 = bearer_id;
|
|
tipc_link_set_active(nl, true);
|
|
tipc_link_set_active(ol, false);
|
|
} else if (tipc_link_prio(nl) == tipc_link_prio(ol)) {
|
|
tipc_link_set_active(nl, true);
|
|
*slot1 = bearer_id;
|
|
} else {
|
|
pr_debug("New link <%s> is standby\n", tipc_link_name(nl));
|
|
}
|
|
|
|
/* Prepare synchronization with first link */
|
|
tipc_link_tnl_prepare(ol, nl, SYNCH_MSG, xmitq);
|
|
}
|
|
|
|
/**
|
|
* tipc_node_link_up - handle addition of link
|
|
*
|
|
* Link becomes active (alone or shared) or standby, depending on its priority.
|
|
*/
|
|
static void tipc_node_link_up(struct tipc_node *n, int bearer_id,
|
|
struct sk_buff_head *xmitq)
|
|
{
|
|
struct tipc_media_addr *maddr;
|
|
|
|
tipc_node_write_lock(n);
|
|
__tipc_node_link_up(n, bearer_id, xmitq);
|
|
maddr = &n->links[bearer_id].maddr;
|
|
tipc_bearer_xmit(n->net, bearer_id, xmitq, maddr);
|
|
tipc_node_write_unlock(n);
|
|
}
|
|
|
|
/**
|
|
* __tipc_node_link_down - handle loss of link
|
|
*/
|
|
static void __tipc_node_link_down(struct tipc_node *n, int *bearer_id,
|
|
struct sk_buff_head *xmitq,
|
|
struct tipc_media_addr **maddr)
|
|
{
|
|
struct tipc_link_entry *le = &n->links[*bearer_id];
|
|
int *slot0 = &n->active_links[0];
|
|
int *slot1 = &n->active_links[1];
|
|
int i, highest = 0, prio;
|
|
struct tipc_link *l, *_l, *tnl;
|
|
|
|
l = n->links[*bearer_id].link;
|
|
if (!l || tipc_link_is_reset(l))
|
|
return;
|
|
|
|
n->working_links--;
|
|
n->action_flags |= TIPC_NOTIFY_LINK_DOWN;
|
|
n->link_id = tipc_link_id(l);
|
|
|
|
tipc_bearer_remove_dest(n->net, *bearer_id, n->addr);
|
|
|
|
pr_debug("Lost link <%s> on network plane %c\n",
|
|
tipc_link_name(l), tipc_link_plane(l));
|
|
|
|
/* Select new active link if any available */
|
|
*slot0 = INVALID_BEARER_ID;
|
|
*slot1 = INVALID_BEARER_ID;
|
|
for (i = 0; i < MAX_BEARERS; i++) {
|
|
_l = n->links[i].link;
|
|
if (!_l || !tipc_link_is_up(_l))
|
|
continue;
|
|
if (_l == l)
|
|
continue;
|
|
prio = tipc_link_prio(_l);
|
|
if (prio < highest)
|
|
continue;
|
|
if (prio > highest) {
|
|
highest = prio;
|
|
*slot0 = i;
|
|
*slot1 = i;
|
|
continue;
|
|
}
|
|
*slot1 = i;
|
|
}
|
|
|
|
if (!tipc_node_is_up(n)) {
|
|
if (tipc_link_peer_is_down(l))
|
|
tipc_node_fsm_evt(n, PEER_LOST_CONTACT_EVT);
|
|
tipc_node_fsm_evt(n, SELF_LOST_CONTACT_EVT);
|
|
tipc_link_fsm_evt(l, LINK_RESET_EVT);
|
|
tipc_link_reset(l);
|
|
tipc_link_build_reset_msg(l, xmitq);
|
|
*maddr = &n->links[*bearer_id].maddr;
|
|
node_lost_contact(n, &le->inputq);
|
|
tipc_bcast_dec_bearer_dst_cnt(n->net, *bearer_id);
|
|
return;
|
|
}
|
|
tipc_bcast_dec_bearer_dst_cnt(n->net, *bearer_id);
|
|
|
|
/* There is still a working link => initiate failover */
|
|
*bearer_id = n->active_links[0];
|
|
tnl = n->links[*bearer_id].link;
|
|
tipc_link_fsm_evt(tnl, LINK_SYNCH_END_EVT);
|
|
tipc_node_fsm_evt(n, NODE_SYNCH_END_EVT);
|
|
n->sync_point = tipc_link_rcv_nxt(tnl) + (U16_MAX / 2 - 1);
|
|
tipc_link_tnl_prepare(l, tnl, FAILOVER_MSG, xmitq);
|
|
tipc_link_reset(l);
|
|
tipc_link_fsm_evt(l, LINK_RESET_EVT);
|
|
tipc_link_fsm_evt(l, LINK_FAILOVER_BEGIN_EVT);
|
|
tipc_node_fsm_evt(n, NODE_FAILOVER_BEGIN_EVT);
|
|
*maddr = &n->links[*bearer_id].maddr;
|
|
}
|
|
|
|
static void tipc_node_link_down(struct tipc_node *n, int bearer_id, bool delete)
|
|
{
|
|
struct tipc_link_entry *le = &n->links[bearer_id];
|
|
struct tipc_link *l = le->link;
|
|
struct tipc_media_addr *maddr;
|
|
struct sk_buff_head xmitq;
|
|
int old_bearer_id = bearer_id;
|
|
|
|
if (!l)
|
|
return;
|
|
|
|
__skb_queue_head_init(&xmitq);
|
|
|
|
tipc_node_write_lock(n);
|
|
if (!tipc_link_is_establishing(l)) {
|
|
__tipc_node_link_down(n, &bearer_id, &xmitq, &maddr);
|
|
if (delete) {
|
|
kfree(l);
|
|
le->link = NULL;
|
|
n->link_cnt--;
|
|
}
|
|
} else {
|
|
/* Defuse pending tipc_node_link_up() */
|
|
tipc_link_fsm_evt(l, LINK_RESET_EVT);
|
|
}
|
|
tipc_node_write_unlock(n);
|
|
if (delete)
|
|
tipc_mon_remove_peer(n->net, n->addr, old_bearer_id);
|
|
tipc_bearer_xmit(n->net, bearer_id, &xmitq, maddr);
|
|
tipc_sk_rcv(n->net, &le->inputq);
|
|
}
|
|
|
|
static bool tipc_node_is_up(struct tipc_node *n)
|
|
{
|
|
return n->active_links[0] != INVALID_BEARER_ID;
|
|
}
|
|
|
|
void tipc_node_check_dest(struct net *net, u32 onode,
|
|
struct tipc_bearer *b,
|
|
u16 capabilities, u32 signature,
|
|
struct tipc_media_addr *maddr,
|
|
bool *respond, bool *dupl_addr)
|
|
{
|
|
struct tipc_node *n;
|
|
struct tipc_link *l;
|
|
struct tipc_link_entry *le;
|
|
bool addr_match = false;
|
|
bool sign_match = false;
|
|
bool link_up = false;
|
|
bool accept_addr = false;
|
|
bool reset = true;
|
|
char *if_name;
|
|
unsigned long intv;
|
|
|
|
*dupl_addr = false;
|
|
*respond = false;
|
|
|
|
n = tipc_node_create(net, onode, capabilities);
|
|
if (!n)
|
|
return;
|
|
|
|
tipc_node_write_lock(n);
|
|
|
|
le = &n->links[b->identity];
|
|
|
|
/* Prepare to validate requesting node's signature and media address */
|
|
l = le->link;
|
|
link_up = l && tipc_link_is_up(l);
|
|
addr_match = l && !memcmp(&le->maddr, maddr, sizeof(*maddr));
|
|
sign_match = (signature == n->signature);
|
|
|
|
/* These three flags give us eight permutations: */
|
|
|
|
if (sign_match && addr_match && link_up) {
|
|
/* All is fine. Do nothing. */
|
|
reset = false;
|
|
} else if (sign_match && addr_match && !link_up) {
|
|
/* Respond. The link will come up in due time */
|
|
*respond = true;
|
|
} else if (sign_match && !addr_match && link_up) {
|
|
/* Peer has changed i/f address without rebooting.
|
|
* If so, the link will reset soon, and the next
|
|
* discovery will be accepted. So we can ignore it.
|
|
* It may also be an cloned or malicious peer having
|
|
* chosen the same node address and signature as an
|
|
* existing one.
|
|
* Ignore requests until the link goes down, if ever.
|
|
*/
|
|
*dupl_addr = true;
|
|
} else if (sign_match && !addr_match && !link_up) {
|
|
/* Peer link has changed i/f address without rebooting.
|
|
* It may also be a cloned or malicious peer; we can't
|
|
* distinguish between the two.
|
|
* The signature is correct, so we must accept.
|
|
*/
|
|
accept_addr = true;
|
|
*respond = true;
|
|
} else if (!sign_match && addr_match && link_up) {
|
|
/* Peer node rebooted. Two possibilities:
|
|
* - Delayed re-discovery; this link endpoint has already
|
|
* reset and re-established contact with the peer, before
|
|
* receiving a discovery message from that node.
|
|
* (The peer happened to receive one from this node first).
|
|
* - The peer came back so fast that our side has not
|
|
* discovered it yet. Probing from this side will soon
|
|
* reset the link, since there can be no working link
|
|
* endpoint at the peer end, and the link will re-establish.
|
|
* Accept the signature, since it comes from a known peer.
|
|
*/
|
|
n->signature = signature;
|
|
} else if (!sign_match && addr_match && !link_up) {
|
|
/* The peer node has rebooted.
|
|
* Accept signature, since it is a known peer.
|
|
*/
|
|
n->signature = signature;
|
|
*respond = true;
|
|
} else if (!sign_match && !addr_match && link_up) {
|
|
/* Peer rebooted with new address, or a new/duplicate peer.
|
|
* Ignore until the link goes down, if ever.
|
|
*/
|
|
*dupl_addr = true;
|
|
} else if (!sign_match && !addr_match && !link_up) {
|
|
/* Peer rebooted with new address, or it is a new peer.
|
|
* Accept signature and address.
|
|
*/
|
|
n->signature = signature;
|
|
accept_addr = true;
|
|
*respond = true;
|
|
}
|
|
|
|
if (!accept_addr)
|
|
goto exit;
|
|
|
|
/* Now create new link if not already existing */
|
|
if (!l) {
|
|
if (n->link_cnt == 2) {
|
|
pr_warn("Cannot establish 3rd link to %x\n", n->addr);
|
|
goto exit;
|
|
}
|
|
if_name = strchr(b->name, ':') + 1;
|
|
if (!tipc_link_create(net, if_name, b->identity, b->tolerance,
|
|
b->net_plane, b->mtu, b->priority,
|
|
b->window, mod(tipc_net(net)->random),
|
|
tipc_own_addr(net), onode,
|
|
n->capabilities,
|
|
tipc_bc_sndlink(n->net), n->bc_entry.link,
|
|
&le->inputq,
|
|
&n->bc_entry.namedq, &l)) {
|
|
*respond = false;
|
|
goto exit;
|
|
}
|
|
tipc_link_reset(l);
|
|
tipc_link_fsm_evt(l, LINK_RESET_EVT);
|
|
if (n->state == NODE_FAILINGOVER)
|
|
tipc_link_fsm_evt(l, LINK_FAILOVER_BEGIN_EVT);
|
|
le->link = l;
|
|
n->link_cnt++;
|
|
tipc_node_calculate_timer(n, l);
|
|
if (n->link_cnt == 1) {
|
|
intv = jiffies + msecs_to_jiffies(n->keepalive_intv);
|
|
if (!mod_timer(&n->timer, intv))
|
|
tipc_node_get(n);
|
|
}
|
|
}
|
|
memcpy(&le->maddr, maddr, sizeof(*maddr));
|
|
exit:
|
|
tipc_node_write_unlock(n);
|
|
if (reset && l && !tipc_link_is_reset(l))
|
|
tipc_node_link_down(n, b->identity, false);
|
|
tipc_node_put(n);
|
|
}
|
|
|
|
void tipc_node_delete_links(struct net *net, int bearer_id)
|
|
{
|
|
struct tipc_net *tn = net_generic(net, tipc_net_id);
|
|
struct tipc_node *n;
|
|
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(n, &tn->node_list, list) {
|
|
tipc_node_link_down(n, bearer_id, true);
|
|
}
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
static void tipc_node_reset_links(struct tipc_node *n)
|
|
{
|
|
char addr_string[16];
|
|
int i;
|
|
|
|
pr_warn("Resetting all links to %s\n",
|
|
tipc_addr_string_fill(addr_string, n->addr));
|
|
|
|
for (i = 0; i < MAX_BEARERS; i++) {
|
|
tipc_node_link_down(n, i, false);
|
|
}
|
|
}
|
|
|
|
/* tipc_node_fsm_evt - node finite state machine
|
|
* Determines when contact is allowed with peer node
|
|
*/
|
|
static void tipc_node_fsm_evt(struct tipc_node *n, int evt)
|
|
{
|
|
int state = n->state;
|
|
|
|
switch (state) {
|
|
case SELF_DOWN_PEER_DOWN:
|
|
switch (evt) {
|
|
case SELF_ESTABL_CONTACT_EVT:
|
|
state = SELF_UP_PEER_COMING;
|
|
break;
|
|
case PEER_ESTABL_CONTACT_EVT:
|
|
state = SELF_COMING_PEER_UP;
|
|
break;
|
|
case SELF_LOST_CONTACT_EVT:
|
|
case PEER_LOST_CONTACT_EVT:
|
|
break;
|
|
case NODE_SYNCH_END_EVT:
|
|
case NODE_SYNCH_BEGIN_EVT:
|
|
case NODE_FAILOVER_BEGIN_EVT:
|
|
case NODE_FAILOVER_END_EVT:
|
|
default:
|
|
goto illegal_evt;
|
|
}
|
|
break;
|
|
case SELF_UP_PEER_UP:
|
|
switch (evt) {
|
|
case SELF_LOST_CONTACT_EVT:
|
|
state = SELF_DOWN_PEER_LEAVING;
|
|
break;
|
|
case PEER_LOST_CONTACT_EVT:
|
|
state = SELF_LEAVING_PEER_DOWN;
|
|
break;
|
|
case NODE_SYNCH_BEGIN_EVT:
|
|
state = NODE_SYNCHING;
|
|
break;
|
|
case NODE_FAILOVER_BEGIN_EVT:
|
|
state = NODE_FAILINGOVER;
|
|
break;
|
|
case SELF_ESTABL_CONTACT_EVT:
|
|
case PEER_ESTABL_CONTACT_EVT:
|
|
case NODE_SYNCH_END_EVT:
|
|
case NODE_FAILOVER_END_EVT:
|
|
break;
|
|
default:
|
|
goto illegal_evt;
|
|
}
|
|
break;
|
|
case SELF_DOWN_PEER_LEAVING:
|
|
switch (evt) {
|
|
case PEER_LOST_CONTACT_EVT:
|
|
state = SELF_DOWN_PEER_DOWN;
|
|
break;
|
|
case SELF_ESTABL_CONTACT_EVT:
|
|
case PEER_ESTABL_CONTACT_EVT:
|
|
case SELF_LOST_CONTACT_EVT:
|
|
break;
|
|
case NODE_SYNCH_END_EVT:
|
|
case NODE_SYNCH_BEGIN_EVT:
|
|
case NODE_FAILOVER_BEGIN_EVT:
|
|
case NODE_FAILOVER_END_EVT:
|
|
default:
|
|
goto illegal_evt;
|
|
}
|
|
break;
|
|
case SELF_UP_PEER_COMING:
|
|
switch (evt) {
|
|
case PEER_ESTABL_CONTACT_EVT:
|
|
state = SELF_UP_PEER_UP;
|
|
break;
|
|
case SELF_LOST_CONTACT_EVT:
|
|
state = SELF_DOWN_PEER_DOWN;
|
|
break;
|
|
case SELF_ESTABL_CONTACT_EVT:
|
|
case PEER_LOST_CONTACT_EVT:
|
|
case NODE_SYNCH_END_EVT:
|
|
case NODE_FAILOVER_BEGIN_EVT:
|
|
break;
|
|
case NODE_SYNCH_BEGIN_EVT:
|
|
case NODE_FAILOVER_END_EVT:
|
|
default:
|
|
goto illegal_evt;
|
|
}
|
|
break;
|
|
case SELF_COMING_PEER_UP:
|
|
switch (evt) {
|
|
case SELF_ESTABL_CONTACT_EVT:
|
|
state = SELF_UP_PEER_UP;
|
|
break;
|
|
case PEER_LOST_CONTACT_EVT:
|
|
state = SELF_DOWN_PEER_DOWN;
|
|
break;
|
|
case SELF_LOST_CONTACT_EVT:
|
|
case PEER_ESTABL_CONTACT_EVT:
|
|
break;
|
|
case NODE_SYNCH_END_EVT:
|
|
case NODE_SYNCH_BEGIN_EVT:
|
|
case NODE_FAILOVER_BEGIN_EVT:
|
|
case NODE_FAILOVER_END_EVT:
|
|
default:
|
|
goto illegal_evt;
|
|
}
|
|
break;
|
|
case SELF_LEAVING_PEER_DOWN:
|
|
switch (evt) {
|
|
case SELF_LOST_CONTACT_EVT:
|
|
state = SELF_DOWN_PEER_DOWN;
|
|
break;
|
|
case SELF_ESTABL_CONTACT_EVT:
|
|
case PEER_ESTABL_CONTACT_EVT:
|
|
case PEER_LOST_CONTACT_EVT:
|
|
break;
|
|
case NODE_SYNCH_END_EVT:
|
|
case NODE_SYNCH_BEGIN_EVT:
|
|
case NODE_FAILOVER_BEGIN_EVT:
|
|
case NODE_FAILOVER_END_EVT:
|
|
default:
|
|
goto illegal_evt;
|
|
}
|
|
break;
|
|
case NODE_FAILINGOVER:
|
|
switch (evt) {
|
|
case SELF_LOST_CONTACT_EVT:
|
|
state = SELF_DOWN_PEER_LEAVING;
|
|
break;
|
|
case PEER_LOST_CONTACT_EVT:
|
|
state = SELF_LEAVING_PEER_DOWN;
|
|
break;
|
|
case NODE_FAILOVER_END_EVT:
|
|
state = SELF_UP_PEER_UP;
|
|
break;
|
|
case NODE_FAILOVER_BEGIN_EVT:
|
|
case SELF_ESTABL_CONTACT_EVT:
|
|
case PEER_ESTABL_CONTACT_EVT:
|
|
break;
|
|
case NODE_SYNCH_BEGIN_EVT:
|
|
case NODE_SYNCH_END_EVT:
|
|
default:
|
|
goto illegal_evt;
|
|
}
|
|
break;
|
|
case NODE_SYNCHING:
|
|
switch (evt) {
|
|
case SELF_LOST_CONTACT_EVT:
|
|
state = SELF_DOWN_PEER_LEAVING;
|
|
break;
|
|
case PEER_LOST_CONTACT_EVT:
|
|
state = SELF_LEAVING_PEER_DOWN;
|
|
break;
|
|
case NODE_SYNCH_END_EVT:
|
|
state = SELF_UP_PEER_UP;
|
|
break;
|
|
case NODE_FAILOVER_BEGIN_EVT:
|
|
state = NODE_FAILINGOVER;
|
|
break;
|
|
case NODE_SYNCH_BEGIN_EVT:
|
|
case SELF_ESTABL_CONTACT_EVT:
|
|
case PEER_ESTABL_CONTACT_EVT:
|
|
break;
|
|
case NODE_FAILOVER_END_EVT:
|
|
default:
|
|
goto illegal_evt;
|
|
}
|
|
break;
|
|
default:
|
|
pr_err("Unknown node fsm state %x\n", state);
|
|
break;
|
|
}
|
|
n->state = state;
|
|
return;
|
|
|
|
illegal_evt:
|
|
pr_err("Illegal node fsm evt %x in state %x\n", evt, state);
|
|
}
|
|
|
|
static void node_lost_contact(struct tipc_node *n,
|
|
struct sk_buff_head *inputq)
|
|
{
|
|
char addr_string[16];
|
|
struct tipc_sock_conn *conn, *safe;
|
|
struct tipc_link *l;
|
|
struct list_head *conns = &n->conn_sks;
|
|
struct sk_buff *skb;
|
|
uint i;
|
|
|
|
pr_debug("Lost contact with %s\n",
|
|
tipc_addr_string_fill(addr_string, n->addr));
|
|
|
|
/* Clean up broadcast state */
|
|
tipc_bcast_remove_peer(n->net, n->bc_entry.link);
|
|
|
|
/* Abort any ongoing link failover */
|
|
for (i = 0; i < MAX_BEARERS; i++) {
|
|
l = n->links[i].link;
|
|
if (l)
|
|
tipc_link_fsm_evt(l, LINK_FAILOVER_END_EVT);
|
|
}
|
|
|
|
/* Notify publications from this node */
|
|
n->action_flags |= TIPC_NOTIFY_NODE_DOWN;
|
|
|
|
/* Notify sockets connected to node */
|
|
list_for_each_entry_safe(conn, safe, conns, list) {
|
|
skb = tipc_msg_create(TIPC_CRITICAL_IMPORTANCE, TIPC_CONN_MSG,
|
|
SHORT_H_SIZE, 0, tipc_own_addr(n->net),
|
|
conn->peer_node, conn->port,
|
|
conn->peer_port, TIPC_ERR_NO_NODE);
|
|
if (likely(skb))
|
|
skb_queue_tail(inputq, skb);
|
|
list_del(&conn->list);
|
|
kfree(conn);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* tipc_node_get_linkname - get the name of a link
|
|
*
|
|
* @bearer_id: id of the bearer
|
|
* @node: peer node address
|
|
* @linkname: link name output buffer
|
|
*
|
|
* Returns 0 on success
|
|
*/
|
|
int tipc_node_get_linkname(struct net *net, u32 bearer_id, u32 addr,
|
|
char *linkname, size_t len)
|
|
{
|
|
struct tipc_link *link;
|
|
int err = -EINVAL;
|
|
struct tipc_node *node = tipc_node_find(net, addr);
|
|
|
|
if (!node)
|
|
return err;
|
|
|
|
if (bearer_id >= MAX_BEARERS)
|
|
goto exit;
|
|
|
|
tipc_node_read_lock(node);
|
|
link = node->links[bearer_id].link;
|
|
if (link) {
|
|
strncpy(linkname, tipc_link_name(link), len);
|
|
err = 0;
|
|
}
|
|
tipc_node_read_unlock(node);
|
|
exit:
|
|
tipc_node_put(node);
|
|
return err;
|
|
}
|
|
|
|
/* Caller should hold node lock for the passed node */
|
|
static int __tipc_nl_add_node(struct tipc_nl_msg *msg, struct tipc_node *node)
|
|
{
|
|
void *hdr;
|
|
struct nlattr *attrs;
|
|
|
|
hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
|
|
NLM_F_MULTI, TIPC_NL_NODE_GET);
|
|
if (!hdr)
|
|
return -EMSGSIZE;
|
|
|
|
attrs = nla_nest_start(msg->skb, TIPC_NLA_NODE);
|
|
if (!attrs)
|
|
goto msg_full;
|
|
|
|
if (nla_put_u32(msg->skb, TIPC_NLA_NODE_ADDR, node->addr))
|
|
goto attr_msg_full;
|
|
if (tipc_node_is_up(node))
|
|
if (nla_put_flag(msg->skb, TIPC_NLA_NODE_UP))
|
|
goto attr_msg_full;
|
|
|
|
nla_nest_end(msg->skb, attrs);
|
|
genlmsg_end(msg->skb, hdr);
|
|
|
|
return 0;
|
|
|
|
attr_msg_full:
|
|
nla_nest_cancel(msg->skb, attrs);
|
|
msg_full:
|
|
genlmsg_cancel(msg->skb, hdr);
|
|
|
|
return -EMSGSIZE;
|
|
}
|
|
|
|
/**
|
|
* tipc_node_xmit() is the general link level function for message sending
|
|
* @net: the applicable net namespace
|
|
* @list: chain of buffers containing message
|
|
* @dnode: address of destination node
|
|
* @selector: a number used for deterministic link selection
|
|
* Consumes the buffer chain.
|
|
* Returns 0 if success, otherwise: -ELINKCONG,-EHOSTUNREACH,-EMSGSIZE,-ENOBUF
|
|
*/
|
|
int tipc_node_xmit(struct net *net, struct sk_buff_head *list,
|
|
u32 dnode, int selector)
|
|
{
|
|
struct tipc_link_entry *le = NULL;
|
|
struct tipc_node *n;
|
|
struct sk_buff_head xmitq;
|
|
int bearer_id;
|
|
int rc;
|
|
|
|
if (in_own_node(net, dnode)) {
|
|
tipc_sk_rcv(net, list);
|
|
return 0;
|
|
}
|
|
|
|
n = tipc_node_find(net, dnode);
|
|
if (unlikely(!n)) {
|
|
skb_queue_purge(list);
|
|
return -EHOSTUNREACH;
|
|
}
|
|
|
|
tipc_node_read_lock(n);
|
|
bearer_id = n->active_links[selector & 1];
|
|
if (unlikely(bearer_id == INVALID_BEARER_ID)) {
|
|
tipc_node_read_unlock(n);
|
|
tipc_node_put(n);
|
|
skb_queue_purge(list);
|
|
return -EHOSTUNREACH;
|
|
}
|
|
|
|
__skb_queue_head_init(&xmitq);
|
|
le = &n->links[bearer_id];
|
|
spin_lock_bh(&le->lock);
|
|
rc = tipc_link_xmit(le->link, list, &xmitq);
|
|
spin_unlock_bh(&le->lock);
|
|
tipc_node_read_unlock(n);
|
|
|
|
if (unlikely(rc == -ENOBUFS))
|
|
tipc_node_link_down(n, bearer_id, false);
|
|
else
|
|
tipc_bearer_xmit(net, bearer_id, &xmitq, &le->maddr);
|
|
|
|
tipc_node_put(n);
|
|
|
|
return rc;
|
|
}
|
|
|
|
/* tipc_node_xmit_skb(): send single buffer to destination
|
|
* Buffers sent via this functon are generally TIPC_SYSTEM_IMPORTANCE
|
|
* messages, which will not be rejected
|
|
* The only exception is datagram messages rerouted after secondary
|
|
* lookup, which are rare and safe to dispose of anyway.
|
|
*/
|
|
int tipc_node_xmit_skb(struct net *net, struct sk_buff *skb, u32 dnode,
|
|
u32 selector)
|
|
{
|
|
struct sk_buff_head head;
|
|
|
|
skb_queue_head_init(&head);
|
|
__skb_queue_tail(&head, skb);
|
|
tipc_node_xmit(net, &head, dnode, selector);
|
|
return 0;
|
|
}
|
|
|
|
void tipc_node_broadcast(struct net *net, struct sk_buff *skb)
|
|
{
|
|
struct sk_buff *txskb;
|
|
struct tipc_node *n;
|
|
u32 dst;
|
|
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(n, tipc_nodes(net), list) {
|
|
dst = n->addr;
|
|
if (in_own_node(net, dst))
|
|
continue;
|
|
if (!tipc_node_is_up(n))
|
|
continue;
|
|
txskb = pskb_copy(skb, GFP_ATOMIC);
|
|
if (!txskb)
|
|
break;
|
|
msg_set_destnode(buf_msg(txskb), dst);
|
|
tipc_node_xmit_skb(net, txskb, dst, 0);
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
kfree_skb(skb);
|
|
}
|
|
|
|
static void tipc_node_mcast_rcv(struct tipc_node *n)
|
|
{
|
|
struct tipc_bclink_entry *be = &n->bc_entry;
|
|
|
|
/* 'arrvq' is under inputq2's lock protection */
|
|
spin_lock_bh(&be->inputq2.lock);
|
|
spin_lock_bh(&be->inputq1.lock);
|
|
skb_queue_splice_tail_init(&be->inputq1, &be->arrvq);
|
|
spin_unlock_bh(&be->inputq1.lock);
|
|
spin_unlock_bh(&be->inputq2.lock);
|
|
tipc_sk_mcast_rcv(n->net, &be->arrvq, &be->inputq2);
|
|
}
|
|
|
|
static void tipc_node_bc_sync_rcv(struct tipc_node *n, struct tipc_msg *hdr,
|
|
int bearer_id, struct sk_buff_head *xmitq)
|
|
{
|
|
struct tipc_link *ucl;
|
|
int rc;
|
|
|
|
rc = tipc_bcast_sync_rcv(n->net, n->bc_entry.link, hdr);
|
|
|
|
if (rc & TIPC_LINK_DOWN_EVT) {
|
|
tipc_node_reset_links(n);
|
|
return;
|
|
}
|
|
|
|
if (!(rc & TIPC_LINK_SND_STATE))
|
|
return;
|
|
|
|
/* If probe message, a STATE response will be sent anyway */
|
|
if (msg_probe(hdr))
|
|
return;
|
|
|
|
/* Produce a STATE message carrying broadcast NACK */
|
|
tipc_node_read_lock(n);
|
|
ucl = n->links[bearer_id].link;
|
|
if (ucl)
|
|
tipc_link_build_state_msg(ucl, xmitq);
|
|
tipc_node_read_unlock(n);
|
|
}
|
|
|
|
/**
|
|
* tipc_node_bc_rcv - process TIPC broadcast packet arriving from off-node
|
|
* @net: the applicable net namespace
|
|
* @skb: TIPC packet
|
|
* @bearer_id: id of bearer message arrived on
|
|
*
|
|
* Invoked with no locks held.
|
|
*/
|
|
static void tipc_node_bc_rcv(struct net *net, struct sk_buff *skb, int bearer_id)
|
|
{
|
|
int rc;
|
|
struct sk_buff_head xmitq;
|
|
struct tipc_bclink_entry *be;
|
|
struct tipc_link_entry *le;
|
|
struct tipc_msg *hdr = buf_msg(skb);
|
|
int usr = msg_user(hdr);
|
|
u32 dnode = msg_destnode(hdr);
|
|
struct tipc_node *n;
|
|
|
|
__skb_queue_head_init(&xmitq);
|
|
|
|
/* If NACK for other node, let rcv link for that node peek into it */
|
|
if ((usr == BCAST_PROTOCOL) && (dnode != tipc_own_addr(net)))
|
|
n = tipc_node_find(net, dnode);
|
|
else
|
|
n = tipc_node_find(net, msg_prevnode(hdr));
|
|
if (!n) {
|
|
kfree_skb(skb);
|
|
return;
|
|
}
|
|
be = &n->bc_entry;
|
|
le = &n->links[bearer_id];
|
|
|
|
rc = tipc_bcast_rcv(net, be->link, skb);
|
|
|
|
/* Broadcast ACKs are sent on a unicast link */
|
|
if (rc & TIPC_LINK_SND_STATE) {
|
|
tipc_node_read_lock(n);
|
|
tipc_link_build_state_msg(le->link, &xmitq);
|
|
tipc_node_read_unlock(n);
|
|
}
|
|
|
|
if (!skb_queue_empty(&xmitq))
|
|
tipc_bearer_xmit(net, bearer_id, &xmitq, &le->maddr);
|
|
|
|
if (!skb_queue_empty(&be->inputq1))
|
|
tipc_node_mcast_rcv(n);
|
|
|
|
/* If reassembly or retransmission failure => reset all links to peer */
|
|
if (rc & TIPC_LINK_DOWN_EVT)
|
|
tipc_node_reset_links(n);
|
|
|
|
tipc_node_put(n);
|
|
}
|
|
|
|
/**
|
|
* tipc_node_check_state - check and if necessary update node state
|
|
* @skb: TIPC packet
|
|
* @bearer_id: identity of bearer delivering the packet
|
|
* Returns true if state is ok, otherwise consumes buffer and returns false
|
|
*/
|
|
static bool tipc_node_check_state(struct tipc_node *n, struct sk_buff *skb,
|
|
int bearer_id, struct sk_buff_head *xmitq)
|
|
{
|
|
struct tipc_msg *hdr = buf_msg(skb);
|
|
int usr = msg_user(hdr);
|
|
int mtyp = msg_type(hdr);
|
|
u16 oseqno = msg_seqno(hdr);
|
|
u16 iseqno = msg_seqno(msg_get_wrapped(hdr));
|
|
u16 exp_pkts = msg_msgcnt(hdr);
|
|
u16 rcv_nxt, syncpt, dlv_nxt, inputq_len;
|
|
int state = n->state;
|
|
struct tipc_link *l, *tnl, *pl = NULL;
|
|
struct tipc_media_addr *maddr;
|
|
int pb_id;
|
|
|
|
l = n->links[bearer_id].link;
|
|
if (!l)
|
|
return false;
|
|
rcv_nxt = tipc_link_rcv_nxt(l);
|
|
|
|
|
|
if (likely((state == SELF_UP_PEER_UP) && (usr != TUNNEL_PROTOCOL)))
|
|
return true;
|
|
|
|
/* Find parallel link, if any */
|
|
for (pb_id = 0; pb_id < MAX_BEARERS; pb_id++) {
|
|
if ((pb_id != bearer_id) && n->links[pb_id].link) {
|
|
pl = n->links[pb_id].link;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/* Check and update node accesibility if applicable */
|
|
if (state == SELF_UP_PEER_COMING) {
|
|
if (!tipc_link_is_up(l))
|
|
return true;
|
|
if (!msg_peer_link_is_up(hdr))
|
|
return true;
|
|
tipc_node_fsm_evt(n, PEER_ESTABL_CONTACT_EVT);
|
|
}
|
|
|
|
if (state == SELF_DOWN_PEER_LEAVING) {
|
|
if (msg_peer_node_is_up(hdr))
|
|
return false;
|
|
tipc_node_fsm_evt(n, PEER_LOST_CONTACT_EVT);
|
|
return true;
|
|
}
|
|
|
|
if (state == SELF_LEAVING_PEER_DOWN)
|
|
return false;
|
|
|
|
/* Ignore duplicate packets */
|
|
if ((usr != LINK_PROTOCOL) && less(oseqno, rcv_nxt))
|
|
return true;
|
|
|
|
/* Initiate or update failover mode if applicable */
|
|
if ((usr == TUNNEL_PROTOCOL) && (mtyp == FAILOVER_MSG)) {
|
|
syncpt = oseqno + exp_pkts - 1;
|
|
if (pl && tipc_link_is_up(pl)) {
|
|
__tipc_node_link_down(n, &pb_id, xmitq, &maddr);
|
|
tipc_skb_queue_splice_tail_init(tipc_link_inputq(pl),
|
|
tipc_link_inputq(l));
|
|
}
|
|
/* If pkts arrive out of order, use lowest calculated syncpt */
|
|
if (less(syncpt, n->sync_point))
|
|
n->sync_point = syncpt;
|
|
}
|
|
|
|
/* Open parallel link when tunnel link reaches synch point */
|
|
if ((n->state == NODE_FAILINGOVER) && tipc_link_is_up(l)) {
|
|
if (!more(rcv_nxt, n->sync_point))
|
|
return true;
|
|
tipc_node_fsm_evt(n, NODE_FAILOVER_END_EVT);
|
|
if (pl)
|
|
tipc_link_fsm_evt(pl, LINK_FAILOVER_END_EVT);
|
|
return true;
|
|
}
|
|
|
|
/* No synching needed if only one link */
|
|
if (!pl || !tipc_link_is_up(pl))
|
|
return true;
|
|
|
|
/* Initiate synch mode if applicable */
|
|
if ((usr == TUNNEL_PROTOCOL) && (mtyp == SYNCH_MSG) && (oseqno == 1)) {
|
|
syncpt = iseqno + exp_pkts - 1;
|
|
if (!tipc_link_is_up(l))
|
|
__tipc_node_link_up(n, bearer_id, xmitq);
|
|
if (n->state == SELF_UP_PEER_UP) {
|
|
n->sync_point = syncpt;
|
|
tipc_link_fsm_evt(l, LINK_SYNCH_BEGIN_EVT);
|
|
tipc_node_fsm_evt(n, NODE_SYNCH_BEGIN_EVT);
|
|
}
|
|
}
|
|
|
|
/* Open tunnel link when parallel link reaches synch point */
|
|
if (n->state == NODE_SYNCHING) {
|
|
if (tipc_link_is_synching(l)) {
|
|
tnl = l;
|
|
} else {
|
|
tnl = pl;
|
|
pl = l;
|
|
}
|
|
inputq_len = skb_queue_len(tipc_link_inputq(pl));
|
|
dlv_nxt = tipc_link_rcv_nxt(pl) - inputq_len;
|
|
if (more(dlv_nxt, n->sync_point)) {
|
|
tipc_link_fsm_evt(tnl, LINK_SYNCH_END_EVT);
|
|
tipc_node_fsm_evt(n, NODE_SYNCH_END_EVT);
|
|
return true;
|
|
}
|
|
if (l == pl)
|
|
return true;
|
|
if ((usr == TUNNEL_PROTOCOL) && (mtyp == SYNCH_MSG))
|
|
return true;
|
|
if (usr == LINK_PROTOCOL)
|
|
return true;
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* tipc_rcv - process TIPC packets/messages arriving from off-node
|
|
* @net: the applicable net namespace
|
|
* @skb: TIPC packet
|
|
* @bearer: pointer to bearer message arrived on
|
|
*
|
|
* Invoked with no locks held. Bearer pointer must point to a valid bearer
|
|
* structure (i.e. cannot be NULL), but bearer can be inactive.
|
|
*/
|
|
void tipc_rcv(struct net *net, struct sk_buff *skb, struct tipc_bearer *b)
|
|
{
|
|
struct sk_buff_head xmitq;
|
|
struct tipc_node *n;
|
|
struct tipc_msg *hdr;
|
|
int bearer_id = b->identity;
|
|
struct tipc_link_entry *le;
|
|
u32 self = tipc_own_addr(net);
|
|
int usr, rc = 0;
|
|
u16 bc_ack;
|
|
|
|
__skb_queue_head_init(&xmitq);
|
|
|
|
/* Ensure message is well-formed before touching the header */
|
|
if (unlikely(!tipc_msg_validate(skb)))
|
|
goto discard;
|
|
hdr = buf_msg(skb);
|
|
usr = msg_user(hdr);
|
|
bc_ack = msg_bcast_ack(hdr);
|
|
|
|
/* Handle arrival of discovery or broadcast packet */
|
|
if (unlikely(msg_non_seq(hdr))) {
|
|
if (unlikely(usr == LINK_CONFIG))
|
|
return tipc_disc_rcv(net, skb, b);
|
|
else
|
|
return tipc_node_bc_rcv(net, skb, bearer_id);
|
|
}
|
|
|
|
/* Discard unicast link messages destined for another node */
|
|
if (unlikely(!msg_short(hdr) && (msg_destnode(hdr) != self)))
|
|
goto discard;
|
|
|
|
/* Locate neighboring node that sent packet */
|
|
n = tipc_node_find(net, msg_prevnode(hdr));
|
|
if (unlikely(!n))
|
|
goto discard;
|
|
le = &n->links[bearer_id];
|
|
|
|
/* Ensure broadcast reception is in synch with peer's send state */
|
|
if (unlikely(usr == LINK_PROTOCOL))
|
|
tipc_node_bc_sync_rcv(n, hdr, bearer_id, &xmitq);
|
|
else if (unlikely(tipc_link_acked(n->bc_entry.link) != bc_ack))
|
|
tipc_bcast_ack_rcv(net, n->bc_entry.link, hdr);
|
|
|
|
/* Receive packet directly if conditions permit */
|
|
tipc_node_read_lock(n);
|
|
if (likely((n->state == SELF_UP_PEER_UP) && (usr != TUNNEL_PROTOCOL))) {
|
|
spin_lock_bh(&le->lock);
|
|
if (le->link) {
|
|
rc = tipc_link_rcv(le->link, skb, &xmitq);
|
|
skb = NULL;
|
|
}
|
|
spin_unlock_bh(&le->lock);
|
|
}
|
|
tipc_node_read_unlock(n);
|
|
|
|
/* Check/update node state before receiving */
|
|
if (unlikely(skb)) {
|
|
if (unlikely(skb_linearize(skb)))
|
|
goto discard;
|
|
tipc_node_write_lock(n);
|
|
if (tipc_node_check_state(n, skb, bearer_id, &xmitq)) {
|
|
if (le->link) {
|
|
rc = tipc_link_rcv(le->link, skb, &xmitq);
|
|
skb = NULL;
|
|
}
|
|
}
|
|
tipc_node_write_unlock(n);
|
|
}
|
|
|
|
if (unlikely(rc & TIPC_LINK_UP_EVT))
|
|
tipc_node_link_up(n, bearer_id, &xmitq);
|
|
|
|
if (unlikely(rc & TIPC_LINK_DOWN_EVT))
|
|
tipc_node_link_down(n, bearer_id, false);
|
|
|
|
if (unlikely(!skb_queue_empty(&n->bc_entry.namedq)))
|
|
tipc_named_rcv(net, &n->bc_entry.namedq);
|
|
|
|
if (unlikely(!skb_queue_empty(&n->bc_entry.inputq1)))
|
|
tipc_node_mcast_rcv(n);
|
|
|
|
if (!skb_queue_empty(&le->inputq))
|
|
tipc_sk_rcv(net, &le->inputq);
|
|
|
|
if (!skb_queue_empty(&xmitq))
|
|
tipc_bearer_xmit(net, bearer_id, &xmitq, &le->maddr);
|
|
|
|
tipc_node_put(n);
|
|
discard:
|
|
kfree_skb(skb);
|
|
}
|
|
|
|
int tipc_nl_peer_rm(struct sk_buff *skb, struct genl_info *info)
|
|
{
|
|
struct net *net = sock_net(skb->sk);
|
|
struct tipc_net *tn = net_generic(net, tipc_net_id);
|
|
struct nlattr *attrs[TIPC_NLA_NET_MAX + 1];
|
|
struct tipc_node *peer;
|
|
u32 addr;
|
|
int err;
|
|
int i;
|
|
|
|
/* We identify the peer by its net */
|
|
if (!info->attrs[TIPC_NLA_NET])
|
|
return -EINVAL;
|
|
|
|
err = nla_parse_nested(attrs, TIPC_NLA_NET_MAX,
|
|
info->attrs[TIPC_NLA_NET], tipc_nl_net_policy,
|
|
info->extack);
|
|
if (err)
|
|
return err;
|
|
|
|
if (!attrs[TIPC_NLA_NET_ADDR])
|
|
return -EINVAL;
|
|
|
|
addr = nla_get_u32(attrs[TIPC_NLA_NET_ADDR]);
|
|
|
|
if (in_own_node(net, addr))
|
|
return -ENOTSUPP;
|
|
|
|
spin_lock_bh(&tn->node_list_lock);
|
|
peer = tipc_node_find(net, addr);
|
|
if (!peer) {
|
|
spin_unlock_bh(&tn->node_list_lock);
|
|
return -ENXIO;
|
|
}
|
|
|
|
tipc_node_write_lock(peer);
|
|
if (peer->state != SELF_DOWN_PEER_DOWN &&
|
|
peer->state != SELF_DOWN_PEER_LEAVING) {
|
|
tipc_node_write_unlock(peer);
|
|
err = -EBUSY;
|
|
goto err_out;
|
|
}
|
|
|
|
for (i = 0; i < MAX_BEARERS; i++) {
|
|
struct tipc_link_entry *le = &peer->links[i];
|
|
|
|
if (le->link) {
|
|
kfree(le->link);
|
|
le->link = NULL;
|
|
peer->link_cnt--;
|
|
}
|
|
}
|
|
tipc_node_write_unlock(peer);
|
|
tipc_node_delete(peer);
|
|
|
|
err = 0;
|
|
err_out:
|
|
tipc_node_put(peer);
|
|
spin_unlock_bh(&tn->node_list_lock);
|
|
|
|
return err;
|
|
}
|
|
|
|
int tipc_nl_node_dump(struct sk_buff *skb, struct netlink_callback *cb)
|
|
{
|
|
int err;
|
|
struct net *net = sock_net(skb->sk);
|
|
struct tipc_net *tn = net_generic(net, tipc_net_id);
|
|
int done = cb->args[0];
|
|
int last_addr = cb->args[1];
|
|
struct tipc_node *node;
|
|
struct tipc_nl_msg msg;
|
|
|
|
if (done)
|
|
return 0;
|
|
|
|
msg.skb = skb;
|
|
msg.portid = NETLINK_CB(cb->skb).portid;
|
|
msg.seq = cb->nlh->nlmsg_seq;
|
|
|
|
rcu_read_lock();
|
|
if (last_addr) {
|
|
node = tipc_node_find(net, last_addr);
|
|
if (!node) {
|
|
rcu_read_unlock();
|
|
/* We never set seq or call nl_dump_check_consistent()
|
|
* this means that setting prev_seq here will cause the
|
|
* consistence check to fail in the netlink callback
|
|
* handler. Resulting in the NLMSG_DONE message having
|
|
* the NLM_F_DUMP_INTR flag set if the node state
|
|
* changed while we released the lock.
|
|
*/
|
|
cb->prev_seq = 1;
|
|
return -EPIPE;
|
|
}
|
|
tipc_node_put(node);
|
|
}
|
|
|
|
list_for_each_entry_rcu(node, &tn->node_list, list) {
|
|
if (last_addr) {
|
|
if (node->addr == last_addr)
|
|
last_addr = 0;
|
|
else
|
|
continue;
|
|
}
|
|
|
|
tipc_node_read_lock(node);
|
|
err = __tipc_nl_add_node(&msg, node);
|
|
if (err) {
|
|
last_addr = node->addr;
|
|
tipc_node_read_unlock(node);
|
|
goto out;
|
|
}
|
|
|
|
tipc_node_read_unlock(node);
|
|
}
|
|
done = 1;
|
|
out:
|
|
cb->args[0] = done;
|
|
cb->args[1] = last_addr;
|
|
rcu_read_unlock();
|
|
|
|
return skb->len;
|
|
}
|
|
|
|
/* tipc_node_find_by_name - locate owner node of link by link's name
|
|
* @net: the applicable net namespace
|
|
* @name: pointer to link name string
|
|
* @bearer_id: pointer to index in 'node->links' array where the link was found.
|
|
*
|
|
* Returns pointer to node owning the link, or 0 if no matching link is found.
|
|
*/
|
|
static struct tipc_node *tipc_node_find_by_name(struct net *net,
|
|
const char *link_name,
|
|
unsigned int *bearer_id)
|
|
{
|
|
struct tipc_net *tn = net_generic(net, tipc_net_id);
|
|
struct tipc_link *l;
|
|
struct tipc_node *n;
|
|
struct tipc_node *found_node = NULL;
|
|
int i;
|
|
|
|
*bearer_id = 0;
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(n, &tn->node_list, list) {
|
|
tipc_node_read_lock(n);
|
|
for (i = 0; i < MAX_BEARERS; i++) {
|
|
l = n->links[i].link;
|
|
if (l && !strcmp(tipc_link_name(l), link_name)) {
|
|
*bearer_id = i;
|
|
found_node = n;
|
|
break;
|
|
}
|
|
}
|
|
tipc_node_read_unlock(n);
|
|
if (found_node)
|
|
break;
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
return found_node;
|
|
}
|
|
|
|
int tipc_nl_node_set_link(struct sk_buff *skb, struct genl_info *info)
|
|
{
|
|
int err;
|
|
int res = 0;
|
|
int bearer_id;
|
|
char *name;
|
|
struct tipc_link *link;
|
|
struct tipc_node *node;
|
|
struct sk_buff_head xmitq;
|
|
struct nlattr *attrs[TIPC_NLA_LINK_MAX + 1];
|
|
struct net *net = sock_net(skb->sk);
|
|
|
|
__skb_queue_head_init(&xmitq);
|
|
|
|
if (!info->attrs[TIPC_NLA_LINK])
|
|
return -EINVAL;
|
|
|
|
err = nla_parse_nested(attrs, TIPC_NLA_LINK_MAX,
|
|
info->attrs[TIPC_NLA_LINK],
|
|
tipc_nl_link_policy, info->extack);
|
|
if (err)
|
|
return err;
|
|
|
|
if (!attrs[TIPC_NLA_LINK_NAME])
|
|
return -EINVAL;
|
|
|
|
name = nla_data(attrs[TIPC_NLA_LINK_NAME]);
|
|
|
|
if (strcmp(name, tipc_bclink_name) == 0)
|
|
return tipc_nl_bc_link_set(net, attrs);
|
|
|
|
node = tipc_node_find_by_name(net, name, &bearer_id);
|
|
if (!node)
|
|
return -EINVAL;
|
|
|
|
tipc_node_read_lock(node);
|
|
|
|
link = node->links[bearer_id].link;
|
|
if (!link) {
|
|
res = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
if (attrs[TIPC_NLA_LINK_PROP]) {
|
|
struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
|
|
|
|
err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_LINK_PROP],
|
|
props);
|
|
if (err) {
|
|
res = err;
|
|
goto out;
|
|
}
|
|
|
|
if (props[TIPC_NLA_PROP_TOL]) {
|
|
u32 tol;
|
|
|
|
tol = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
|
|
tipc_link_set_tolerance(link, tol, &xmitq);
|
|
}
|
|
if (props[TIPC_NLA_PROP_PRIO]) {
|
|
u32 prio;
|
|
|
|
prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
|
|
tipc_link_set_prio(link, prio, &xmitq);
|
|
}
|
|
if (props[TIPC_NLA_PROP_WIN]) {
|
|
u32 win;
|
|
|
|
win = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
|
|
tipc_link_set_queue_limits(link, win);
|
|
}
|
|
}
|
|
|
|
out:
|
|
tipc_node_read_unlock(node);
|
|
tipc_bearer_xmit(net, bearer_id, &xmitq, &node->links[bearer_id].maddr);
|
|
return res;
|
|
}
|
|
|
|
int tipc_nl_node_get_link(struct sk_buff *skb, struct genl_info *info)
|
|
{
|
|
struct net *net = genl_info_net(info);
|
|
struct nlattr *attrs[TIPC_NLA_LINK_MAX + 1];
|
|
struct tipc_nl_msg msg;
|
|
char *name;
|
|
int err;
|
|
|
|
msg.portid = info->snd_portid;
|
|
msg.seq = info->snd_seq;
|
|
|
|
if (!info->attrs[TIPC_NLA_LINK])
|
|
return -EINVAL;
|
|
|
|
err = nla_parse_nested(attrs, TIPC_NLA_LINK_MAX,
|
|
info->attrs[TIPC_NLA_LINK],
|
|
tipc_nl_link_policy, info->extack);
|
|
if (err)
|
|
return err;
|
|
|
|
if (!attrs[TIPC_NLA_LINK_NAME])
|
|
return -EINVAL;
|
|
|
|
name = nla_data(attrs[TIPC_NLA_LINK_NAME]);
|
|
|
|
msg.skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
|
|
if (!msg.skb)
|
|
return -ENOMEM;
|
|
|
|
if (strcmp(name, tipc_bclink_name) == 0) {
|
|
err = tipc_nl_add_bc_link(net, &msg);
|
|
if (err)
|
|
goto err_free;
|
|
} else {
|
|
int bearer_id;
|
|
struct tipc_node *node;
|
|
struct tipc_link *link;
|
|
|
|
node = tipc_node_find_by_name(net, name, &bearer_id);
|
|
if (!node) {
|
|
err = -EINVAL;
|
|
goto err_free;
|
|
}
|
|
|
|
tipc_node_read_lock(node);
|
|
link = node->links[bearer_id].link;
|
|
if (!link) {
|
|
tipc_node_read_unlock(node);
|
|
err = -EINVAL;
|
|
goto err_free;
|
|
}
|
|
|
|
err = __tipc_nl_add_link(net, &msg, link, 0);
|
|
tipc_node_read_unlock(node);
|
|
if (err)
|
|
goto err_free;
|
|
}
|
|
|
|
return genlmsg_reply(msg.skb, info);
|
|
|
|
err_free:
|
|
nlmsg_free(msg.skb);
|
|
return err;
|
|
}
|
|
|
|
int tipc_nl_node_reset_link_stats(struct sk_buff *skb, struct genl_info *info)
|
|
{
|
|
int err;
|
|
char *link_name;
|
|
unsigned int bearer_id;
|
|
struct tipc_link *link;
|
|
struct tipc_node *node;
|
|
struct nlattr *attrs[TIPC_NLA_LINK_MAX + 1];
|
|
struct net *net = sock_net(skb->sk);
|
|
struct tipc_link_entry *le;
|
|
|
|
if (!info->attrs[TIPC_NLA_LINK])
|
|
return -EINVAL;
|
|
|
|
err = nla_parse_nested(attrs, TIPC_NLA_LINK_MAX,
|
|
info->attrs[TIPC_NLA_LINK],
|
|
tipc_nl_link_policy, info->extack);
|
|
if (err)
|
|
return err;
|
|
|
|
if (!attrs[TIPC_NLA_LINK_NAME])
|
|
return -EINVAL;
|
|
|
|
link_name = nla_data(attrs[TIPC_NLA_LINK_NAME]);
|
|
|
|
if (strcmp(link_name, tipc_bclink_name) == 0) {
|
|
err = tipc_bclink_reset_stats(net);
|
|
if (err)
|
|
return err;
|
|
return 0;
|
|
}
|
|
|
|
node = tipc_node_find_by_name(net, link_name, &bearer_id);
|
|
if (!node)
|
|
return -EINVAL;
|
|
|
|
le = &node->links[bearer_id];
|
|
tipc_node_read_lock(node);
|
|
spin_lock_bh(&le->lock);
|
|
link = node->links[bearer_id].link;
|
|
if (!link) {
|
|
spin_unlock_bh(&le->lock);
|
|
tipc_node_read_unlock(node);
|
|
return -EINVAL;
|
|
}
|
|
tipc_link_reset_stats(link);
|
|
spin_unlock_bh(&le->lock);
|
|
tipc_node_read_unlock(node);
|
|
return 0;
|
|
}
|
|
|
|
/* Caller should hold node lock */
|
|
static int __tipc_nl_add_node_links(struct net *net, struct tipc_nl_msg *msg,
|
|
struct tipc_node *node, u32 *prev_link)
|
|
{
|
|
u32 i;
|
|
int err;
|
|
|
|
for (i = *prev_link; i < MAX_BEARERS; i++) {
|
|
*prev_link = i;
|
|
|
|
if (!node->links[i].link)
|
|
continue;
|
|
|
|
err = __tipc_nl_add_link(net, msg,
|
|
node->links[i].link, NLM_F_MULTI);
|
|
if (err)
|
|
return err;
|
|
}
|
|
*prev_link = 0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int tipc_nl_node_dump_link(struct sk_buff *skb, struct netlink_callback *cb)
|
|
{
|
|
struct net *net = sock_net(skb->sk);
|
|
struct tipc_net *tn = net_generic(net, tipc_net_id);
|
|
struct tipc_node *node;
|
|
struct tipc_nl_msg msg;
|
|
u32 prev_node = cb->args[0];
|
|
u32 prev_link = cb->args[1];
|
|
int done = cb->args[2];
|
|
int err;
|
|
|
|
if (done)
|
|
return 0;
|
|
|
|
msg.skb = skb;
|
|
msg.portid = NETLINK_CB(cb->skb).portid;
|
|
msg.seq = cb->nlh->nlmsg_seq;
|
|
|
|
rcu_read_lock();
|
|
if (prev_node) {
|
|
node = tipc_node_find(net, prev_node);
|
|
if (!node) {
|
|
/* We never set seq or call nl_dump_check_consistent()
|
|
* this means that setting prev_seq here will cause the
|
|
* consistence check to fail in the netlink callback
|
|
* handler. Resulting in the last NLMSG_DONE message
|
|
* having the NLM_F_DUMP_INTR flag set.
|
|
*/
|
|
cb->prev_seq = 1;
|
|
goto out;
|
|
}
|
|
tipc_node_put(node);
|
|
|
|
list_for_each_entry_continue_rcu(node, &tn->node_list,
|
|
list) {
|
|
tipc_node_read_lock(node);
|
|
err = __tipc_nl_add_node_links(net, &msg, node,
|
|
&prev_link);
|
|
tipc_node_read_unlock(node);
|
|
if (err)
|
|
goto out;
|
|
|
|
prev_node = node->addr;
|
|
}
|
|
} else {
|
|
err = tipc_nl_add_bc_link(net, &msg);
|
|
if (err)
|
|
goto out;
|
|
|
|
list_for_each_entry_rcu(node, &tn->node_list, list) {
|
|
tipc_node_read_lock(node);
|
|
err = __tipc_nl_add_node_links(net, &msg, node,
|
|
&prev_link);
|
|
tipc_node_read_unlock(node);
|
|
if (err)
|
|
goto out;
|
|
|
|
prev_node = node->addr;
|
|
}
|
|
}
|
|
done = 1;
|
|
out:
|
|
rcu_read_unlock();
|
|
|
|
cb->args[0] = prev_node;
|
|
cb->args[1] = prev_link;
|
|
cb->args[2] = done;
|
|
|
|
return skb->len;
|
|
}
|
|
|
|
int tipc_nl_node_set_monitor(struct sk_buff *skb, struct genl_info *info)
|
|
{
|
|
struct nlattr *attrs[TIPC_NLA_MON_MAX + 1];
|
|
struct net *net = sock_net(skb->sk);
|
|
int err;
|
|
|
|
if (!info->attrs[TIPC_NLA_MON])
|
|
return -EINVAL;
|
|
|
|
err = nla_parse_nested(attrs, TIPC_NLA_MON_MAX,
|
|
info->attrs[TIPC_NLA_MON],
|
|
tipc_nl_monitor_policy, info->extack);
|
|
if (err)
|
|
return err;
|
|
|
|
if (attrs[TIPC_NLA_MON_ACTIVATION_THRESHOLD]) {
|
|
u32 val;
|
|
|
|
val = nla_get_u32(attrs[TIPC_NLA_MON_ACTIVATION_THRESHOLD]);
|
|
err = tipc_nl_monitor_set_threshold(net, val);
|
|
if (err)
|
|
return err;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __tipc_nl_add_monitor_prop(struct net *net, struct tipc_nl_msg *msg)
|
|
{
|
|
struct nlattr *attrs;
|
|
void *hdr;
|
|
u32 val;
|
|
|
|
hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
|
|
0, TIPC_NL_MON_GET);
|
|
if (!hdr)
|
|
return -EMSGSIZE;
|
|
|
|
attrs = nla_nest_start(msg->skb, TIPC_NLA_MON);
|
|
if (!attrs)
|
|
goto msg_full;
|
|
|
|
val = tipc_nl_monitor_get_threshold(net);
|
|
|
|
if (nla_put_u32(msg->skb, TIPC_NLA_MON_ACTIVATION_THRESHOLD, val))
|
|
goto attr_msg_full;
|
|
|
|
nla_nest_end(msg->skb, attrs);
|
|
genlmsg_end(msg->skb, hdr);
|
|
|
|
return 0;
|
|
|
|
attr_msg_full:
|
|
nla_nest_cancel(msg->skb, attrs);
|
|
msg_full:
|
|
genlmsg_cancel(msg->skb, hdr);
|
|
|
|
return -EMSGSIZE;
|
|
}
|
|
|
|
int tipc_nl_node_get_monitor(struct sk_buff *skb, struct genl_info *info)
|
|
{
|
|
struct net *net = sock_net(skb->sk);
|
|
struct tipc_nl_msg msg;
|
|
int err;
|
|
|
|
msg.skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
|
|
if (!msg.skb)
|
|
return -ENOMEM;
|
|
msg.portid = info->snd_portid;
|
|
msg.seq = info->snd_seq;
|
|
|
|
err = __tipc_nl_add_monitor_prop(net, &msg);
|
|
if (err) {
|
|
nlmsg_free(msg.skb);
|
|
return err;
|
|
}
|
|
|
|
return genlmsg_reply(msg.skb, info);
|
|
}
|
|
|
|
int tipc_nl_node_dump_monitor(struct sk_buff *skb, struct netlink_callback *cb)
|
|
{
|
|
struct net *net = sock_net(skb->sk);
|
|
u32 prev_bearer = cb->args[0];
|
|
struct tipc_nl_msg msg;
|
|
int bearer_id;
|
|
int err;
|
|
|
|
if (prev_bearer == MAX_BEARERS)
|
|
return 0;
|
|
|
|
msg.skb = skb;
|
|
msg.portid = NETLINK_CB(cb->skb).portid;
|
|
msg.seq = cb->nlh->nlmsg_seq;
|
|
|
|
rtnl_lock();
|
|
for (bearer_id = prev_bearer; bearer_id < MAX_BEARERS; bearer_id++) {
|
|
err = __tipc_nl_add_monitor(net, &msg, bearer_id);
|
|
if (err)
|
|
break;
|
|
}
|
|
rtnl_unlock();
|
|
cb->args[0] = bearer_id;
|
|
|
|
return skb->len;
|
|
}
|
|
|
|
int tipc_nl_node_dump_monitor_peer(struct sk_buff *skb,
|
|
struct netlink_callback *cb)
|
|
{
|
|
struct net *net = sock_net(skb->sk);
|
|
u32 prev_node = cb->args[1];
|
|
u32 bearer_id = cb->args[2];
|
|
int done = cb->args[0];
|
|
struct tipc_nl_msg msg;
|
|
int err;
|
|
|
|
if (!prev_node) {
|
|
struct nlattr **attrs;
|
|
struct nlattr *mon[TIPC_NLA_MON_MAX + 1];
|
|
|
|
err = tipc_nlmsg_parse(cb->nlh, &attrs);
|
|
if (err)
|
|
return err;
|
|
|
|
if (!attrs[TIPC_NLA_MON])
|
|
return -EINVAL;
|
|
|
|
err = nla_parse_nested(mon, TIPC_NLA_MON_MAX,
|
|
attrs[TIPC_NLA_MON],
|
|
tipc_nl_monitor_policy, NULL);
|
|
if (err)
|
|
return err;
|
|
|
|
if (!mon[TIPC_NLA_MON_REF])
|
|
return -EINVAL;
|
|
|
|
bearer_id = nla_get_u32(mon[TIPC_NLA_MON_REF]);
|
|
|
|
if (bearer_id >= MAX_BEARERS)
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (done)
|
|
return 0;
|
|
|
|
msg.skb = skb;
|
|
msg.portid = NETLINK_CB(cb->skb).portid;
|
|
msg.seq = cb->nlh->nlmsg_seq;
|
|
|
|
rtnl_lock();
|
|
err = tipc_nl_add_monitor_peer(net, &msg, bearer_id, &prev_node);
|
|
if (!err)
|
|
done = 1;
|
|
|
|
rtnl_unlock();
|
|
cb->args[0] = done;
|
|
cb->args[1] = prev_node;
|
|
cb->args[2] = bearer_id;
|
|
|
|
return skb->len;
|
|
}
|