mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-24 17:59:32 +00:00
![kbuild test robot](/assets/img/avatar_default.png)
Fixes: 25b0b9c4e8
("tipc: handle collisions of 32-bit node address hash values")
Signed-off-by: Fengguang Wu <fengguang.wu@intel.com>
Acked-by: Jon Maloy jon.maloy@ericsson.com
Signed-off-by: David S. Miller <davem@davemloft.net>
410 lines
12 KiB
C
410 lines
12 KiB
C
/*
|
|
* net/tipc/discover.c
|
|
*
|
|
* Copyright (c) 2003-2006, 2014-2018, Ericsson AB
|
|
* Copyright (c) 2005-2006, 2010-2011, Wind River Systems
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions are met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. Neither the names of the copyright holders nor the names of its
|
|
* contributors may be used to endorse or promote products derived from
|
|
* this software without specific prior written permission.
|
|
*
|
|
* Alternatively, this software may be distributed under the terms of the
|
|
* GNU General Public License ("GPL") version 2 as published by the Free
|
|
* Software Foundation.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
|
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
|
|
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#include "core.h"
|
|
#include "node.h"
|
|
#include "discover.h"
|
|
|
|
/* min delay during bearer start up */
|
|
#define TIPC_DISC_INIT msecs_to_jiffies(125)
|
|
/* max delay if bearer has no links */
|
|
#define TIPC_DISC_FAST msecs_to_jiffies(1000)
|
|
/* max delay if bearer has links */
|
|
#define TIPC_DISC_SLOW msecs_to_jiffies(60000)
|
|
/* indicates no timer in use */
|
|
#define TIPC_DISC_INACTIVE 0xffffffff
|
|
|
|
/**
|
|
* struct tipc_discoverer - information about an ongoing link setup request
|
|
* @bearer_id: identity of bearer issuing requests
|
|
* @net: network namespace instance
|
|
* @dest: destination address for request messages
|
|
* @domain: network domain to which links can be established
|
|
* @num_nodes: number of nodes currently discovered (i.e. with an active link)
|
|
* @lock: spinlock for controlling access to requests
|
|
* @skb: request message to be (repeatedly) sent
|
|
* @timer: timer governing period between requests
|
|
* @timer_intv: current interval between requests (in ms)
|
|
*/
|
|
struct tipc_discoverer {
|
|
u32 bearer_id;
|
|
struct tipc_media_addr dest;
|
|
struct net *net;
|
|
u32 domain;
|
|
int num_nodes;
|
|
spinlock_t lock;
|
|
struct sk_buff *skb;
|
|
struct timer_list timer;
|
|
unsigned long timer_intv;
|
|
};
|
|
|
|
/**
|
|
* tipc_disc_init_msg - initialize a link setup message
|
|
* @net: the applicable net namespace
|
|
* @type: message type (request or response)
|
|
* @b: ptr to bearer issuing message
|
|
*/
|
|
static void tipc_disc_init_msg(struct net *net, struct sk_buff *skb,
|
|
u32 mtyp, struct tipc_bearer *b)
|
|
{
|
|
struct tipc_net *tn = tipc_net(net);
|
|
u32 dest_domain = b->domain;
|
|
struct tipc_msg *hdr;
|
|
|
|
hdr = buf_msg(skb);
|
|
tipc_msg_init(tn->trial_addr, hdr, LINK_CONFIG, mtyp,
|
|
MAX_H_SIZE, dest_domain);
|
|
msg_set_size(hdr, MAX_H_SIZE + NODE_ID_LEN);
|
|
msg_set_non_seq(hdr, 1);
|
|
msg_set_node_sig(hdr, tn->random);
|
|
msg_set_node_capabilities(hdr, TIPC_NODE_CAPABILITIES);
|
|
msg_set_dest_domain(hdr, dest_domain);
|
|
msg_set_bc_netid(hdr, tn->net_id);
|
|
b->media->addr2msg(msg_media_addr(hdr), &b->addr);
|
|
msg_set_node_id(hdr, tipc_own_id(net));
|
|
}
|
|
|
|
static void tipc_disc_msg_xmit(struct net *net, u32 mtyp, u32 dst,
|
|
u32 src, u32 sugg_addr,
|
|
struct tipc_media_addr *maddr,
|
|
struct tipc_bearer *b)
|
|
{
|
|
struct tipc_msg *hdr;
|
|
struct sk_buff *skb;
|
|
|
|
skb = tipc_buf_acquire(MAX_H_SIZE + NODE_ID_LEN, GFP_ATOMIC);
|
|
if (!skb)
|
|
return;
|
|
hdr = buf_msg(skb);
|
|
tipc_disc_init_msg(net, skb, mtyp, b);
|
|
msg_set_sugg_node_addr(hdr, sugg_addr);
|
|
msg_set_dest_domain(hdr, dst);
|
|
tipc_bearer_xmit_skb(net, b->identity, skb, maddr);
|
|
}
|
|
|
|
/**
|
|
* disc_dupl_alert - issue node address duplication alert
|
|
* @b: pointer to bearer detecting duplication
|
|
* @node_addr: duplicated node address
|
|
* @media_addr: media address advertised by duplicated node
|
|
*/
|
|
static void disc_dupl_alert(struct tipc_bearer *b, u32 node_addr,
|
|
struct tipc_media_addr *media_addr)
|
|
{
|
|
char media_addr_str[64];
|
|
|
|
tipc_media_addr_printf(media_addr_str, sizeof(media_addr_str),
|
|
media_addr);
|
|
pr_warn("Duplicate %x using %s seen on <%s>\n", node_addr,
|
|
media_addr_str, b->name);
|
|
}
|
|
|
|
/* tipc_disc_addr_trial(): - handle an address uniqueness trial from peer
|
|
*/
|
|
static bool tipc_disc_addr_trial_msg(struct tipc_discoverer *d,
|
|
struct tipc_media_addr *maddr,
|
|
struct tipc_bearer *b,
|
|
u32 dst, u32 src,
|
|
u32 sugg_addr,
|
|
u8 *peer_id,
|
|
int mtyp)
|
|
{
|
|
struct net *net = d->net;
|
|
struct tipc_net *tn = tipc_net(net);
|
|
bool trial = time_before(jiffies, tn->addr_trial_end);
|
|
u32 self = tipc_own_addr(net);
|
|
|
|
if (mtyp == DSC_TRIAL_FAIL_MSG) {
|
|
if (!trial)
|
|
return true;
|
|
|
|
/* Ignore if somebody else already gave new suggestion */
|
|
if (dst != tn->trial_addr)
|
|
return true;
|
|
|
|
/* Otherwise update trial address and restart trial period */
|
|
tn->trial_addr = sugg_addr;
|
|
msg_set_prevnode(buf_msg(d->skb), sugg_addr);
|
|
tn->addr_trial_end = jiffies + msecs_to_jiffies(1000);
|
|
return true;
|
|
}
|
|
|
|
/* Apply trial address if we just left trial period */
|
|
if (!trial && !self) {
|
|
tipc_net_finalize(net, tn->trial_addr);
|
|
msg_set_type(buf_msg(d->skb), DSC_REQ_MSG);
|
|
}
|
|
|
|
if (mtyp != DSC_TRIAL_MSG)
|
|
return false;
|
|
|
|
sugg_addr = tipc_node_try_addr(net, peer_id, src);
|
|
if (sugg_addr)
|
|
tipc_disc_msg_xmit(net, DSC_TRIAL_FAIL_MSG, src,
|
|
self, sugg_addr, maddr, b);
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* tipc_disc_rcv - handle incoming discovery message (request or response)
|
|
* @net: applicable net namespace
|
|
* @skb: buffer containing message
|
|
* @b: bearer that message arrived on
|
|
*/
|
|
void tipc_disc_rcv(struct net *net, struct sk_buff *skb,
|
|
struct tipc_bearer *b)
|
|
{
|
|
struct tipc_net *tn = tipc_net(net);
|
|
struct tipc_msg *hdr = buf_msg(skb);
|
|
u16 caps = msg_node_capabilities(hdr);
|
|
bool legacy = tn->legacy_addr_format;
|
|
u32 sugg = msg_sugg_node_addr(hdr);
|
|
u32 signature = msg_node_sig(hdr);
|
|
u8 peer_id[NODE_ID_LEN] = {0,};
|
|
u32 dst = msg_dest_domain(hdr);
|
|
u32 net_id = msg_bc_netid(hdr);
|
|
struct tipc_media_addr maddr;
|
|
u32 src = msg_prevnode(hdr);
|
|
u32 mtyp = msg_type(hdr);
|
|
bool dupl_addr = false;
|
|
bool respond = false;
|
|
u32 self;
|
|
int err;
|
|
|
|
skb_linearize(skb);
|
|
hdr = buf_msg(skb);
|
|
|
|
if (caps & TIPC_NODE_ID128)
|
|
memcpy(peer_id, msg_node_id(hdr), NODE_ID_LEN);
|
|
else
|
|
sprintf(peer_id, "%x", src);
|
|
|
|
err = b->media->msg2addr(b, &maddr, msg_media_addr(hdr));
|
|
kfree_skb(skb);
|
|
if (err || maddr.broadcast) {
|
|
pr_warn_ratelimited("Rcv corrupt discovery message\n");
|
|
return;
|
|
}
|
|
/* Ignore discovery messages from own node */
|
|
if (!memcmp(&maddr, &b->addr, sizeof(maddr)))
|
|
return;
|
|
if (net_id != tn->net_id)
|
|
return;
|
|
if (tipc_disc_addr_trial_msg(b->disc, &maddr, b, dst,
|
|
src, sugg, peer_id, mtyp))
|
|
return;
|
|
self = tipc_own_addr(net);
|
|
|
|
/* Message from somebody using this node's address */
|
|
if (in_own_node(net, src)) {
|
|
disc_dupl_alert(b, self, &maddr);
|
|
return;
|
|
}
|
|
if (!tipc_in_scope(legacy, dst, self))
|
|
return;
|
|
if (!tipc_in_scope(legacy, b->domain, src))
|
|
return;
|
|
tipc_node_check_dest(net, src, peer_id, b, caps, signature,
|
|
&maddr, &respond, &dupl_addr);
|
|
if (dupl_addr)
|
|
disc_dupl_alert(b, src, &maddr);
|
|
if (!respond)
|
|
return;
|
|
if (mtyp != DSC_REQ_MSG)
|
|
return;
|
|
tipc_disc_msg_xmit(net, DSC_RESP_MSG, src, self, 0, &maddr, b);
|
|
}
|
|
|
|
/* tipc_disc_add_dest - increment set of discovered nodes
|
|
*/
|
|
void tipc_disc_add_dest(struct tipc_discoverer *d)
|
|
{
|
|
spin_lock_bh(&d->lock);
|
|
d->num_nodes++;
|
|
spin_unlock_bh(&d->lock);
|
|
}
|
|
|
|
/* tipc_disc_remove_dest - decrement set of discovered nodes
|
|
*/
|
|
void tipc_disc_remove_dest(struct tipc_discoverer *d)
|
|
{
|
|
int intv, num;
|
|
|
|
spin_lock_bh(&d->lock);
|
|
d->num_nodes--;
|
|
num = d->num_nodes;
|
|
intv = d->timer_intv;
|
|
if (!num && (intv == TIPC_DISC_INACTIVE || intv > TIPC_DISC_FAST)) {
|
|
d->timer_intv = TIPC_DISC_INIT;
|
|
mod_timer(&d->timer, jiffies + d->timer_intv);
|
|
}
|
|
spin_unlock_bh(&d->lock);
|
|
}
|
|
|
|
/* tipc_disc_timeout - send a periodic link setup request
|
|
* Called whenever a link setup request timer associated with a bearer expires.
|
|
* - Keep doubling time between sent request until limit is reached;
|
|
* - Hold at fast polling rate if we don't have any associated nodes
|
|
* - Otherwise hold at slow polling rate
|
|
*/
|
|
static void tipc_disc_timeout(struct timer_list *t)
|
|
{
|
|
struct tipc_discoverer *d = from_timer(d, t, timer);
|
|
struct tipc_net *tn = tipc_net(d->net);
|
|
u32 self = tipc_own_addr(d->net);
|
|
struct tipc_media_addr maddr;
|
|
struct sk_buff *skb = NULL;
|
|
struct net *net = d->net;
|
|
u32 bearer_id;
|
|
|
|
spin_lock_bh(&d->lock);
|
|
|
|
/* Stop searching if only desired node has been found */
|
|
if (tipc_node(d->domain) && d->num_nodes) {
|
|
d->timer_intv = TIPC_DISC_INACTIVE;
|
|
goto exit;
|
|
}
|
|
|
|
/* Did we just leave the address trial period ? */
|
|
if (!self && !time_before(jiffies, tn->addr_trial_end)) {
|
|
self = tn->trial_addr;
|
|
tipc_net_finalize(net, self);
|
|
msg_set_prevnode(buf_msg(d->skb), self);
|
|
msg_set_type(buf_msg(d->skb), DSC_REQ_MSG);
|
|
}
|
|
|
|
/* Adjust timeout interval according to discovery phase */
|
|
if (time_before(jiffies, tn->addr_trial_end)) {
|
|
d->timer_intv = TIPC_DISC_INIT;
|
|
} else {
|
|
d->timer_intv *= 2;
|
|
if (d->num_nodes && d->timer_intv > TIPC_DISC_SLOW)
|
|
d->timer_intv = TIPC_DISC_SLOW;
|
|
else if (!d->num_nodes && d->timer_intv > TIPC_DISC_FAST)
|
|
d->timer_intv = TIPC_DISC_FAST;
|
|
}
|
|
|
|
mod_timer(&d->timer, jiffies + d->timer_intv);
|
|
memcpy(&maddr, &d->dest, sizeof(maddr));
|
|
skb = skb_clone(d->skb, GFP_ATOMIC);
|
|
bearer_id = d->bearer_id;
|
|
exit:
|
|
spin_unlock_bh(&d->lock);
|
|
if (skb)
|
|
tipc_bearer_xmit_skb(net, bearer_id, skb, &maddr);
|
|
}
|
|
|
|
/**
|
|
* tipc_disc_create - create object to send periodic link setup requests
|
|
* @net: the applicable net namespace
|
|
* @b: ptr to bearer issuing requests
|
|
* @dest: destination address for request messages
|
|
* @dest_domain: network domain to which links can be established
|
|
*
|
|
* Returns 0 if successful, otherwise -errno.
|
|
*/
|
|
int tipc_disc_create(struct net *net, struct tipc_bearer *b,
|
|
struct tipc_media_addr *dest, struct sk_buff **skb)
|
|
{
|
|
struct tipc_net *tn = tipc_net(net);
|
|
struct tipc_discoverer *d;
|
|
|
|
d = kmalloc(sizeof(*d), GFP_ATOMIC);
|
|
if (!d)
|
|
return -ENOMEM;
|
|
d->skb = tipc_buf_acquire(MAX_H_SIZE + NODE_ID_LEN, GFP_ATOMIC);
|
|
if (!d->skb) {
|
|
kfree(d);
|
|
return -ENOMEM;
|
|
}
|
|
tipc_disc_init_msg(net, d->skb, DSC_REQ_MSG, b);
|
|
|
|
/* Do we need an address trial period first ? */
|
|
if (!tipc_own_addr(net)) {
|
|
tn->addr_trial_end = jiffies + msecs_to_jiffies(1000);
|
|
msg_set_type(buf_msg(d->skb), DSC_TRIAL_MSG);
|
|
}
|
|
memcpy(&d->dest, dest, sizeof(*dest));
|
|
d->net = net;
|
|
d->bearer_id = b->identity;
|
|
d->domain = b->domain;
|
|
d->num_nodes = 0;
|
|
d->timer_intv = TIPC_DISC_INIT;
|
|
spin_lock_init(&d->lock);
|
|
timer_setup(&d->timer, tipc_disc_timeout, 0);
|
|
mod_timer(&d->timer, jiffies + d->timer_intv);
|
|
b->disc = d;
|
|
*skb = skb_clone(d->skb, GFP_ATOMIC);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* tipc_disc_delete - destroy object sending periodic link setup requests
|
|
* @d: ptr to link duest structure
|
|
*/
|
|
void tipc_disc_delete(struct tipc_discoverer *d)
|
|
{
|
|
del_timer_sync(&d->timer);
|
|
kfree_skb(d->skb);
|
|
kfree(d);
|
|
}
|
|
|
|
/**
|
|
* tipc_disc_reset - reset object to send periodic link setup requests
|
|
* @net: the applicable net namespace
|
|
* @b: ptr to bearer issuing requests
|
|
* @dest_domain: network domain to which links can be established
|
|
*/
|
|
void tipc_disc_reset(struct net *net, struct tipc_bearer *b)
|
|
{
|
|
struct tipc_discoverer *d = b->disc;
|
|
struct tipc_media_addr maddr;
|
|
struct sk_buff *skb;
|
|
|
|
spin_lock_bh(&d->lock);
|
|
tipc_disc_init_msg(net, d->skb, DSC_REQ_MSG, b);
|
|
d->net = net;
|
|
d->bearer_id = b->identity;
|
|
d->domain = b->domain;
|
|
d->num_nodes = 0;
|
|
d->timer_intv = TIPC_DISC_INIT;
|
|
memcpy(&maddr, &d->dest, sizeof(maddr));
|
|
mod_timer(&d->timer, jiffies + d->timer_intv);
|
|
skb = skb_clone(d->skb, GFP_ATOMIC);
|
|
spin_unlock_bh(&d->lock);
|
|
if (skb)
|
|
tipc_bearer_xmit_skb(net, b->identity, skb, &maddr);
|
|
}
|