forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
419 lines
12 KiB
419 lines
12 KiB
/* |
|
* net/tipc/name_distr.c: TIPC name distribution code |
|
* |
|
* Copyright (c) 2000-2006, 2014-2019, Ericsson AB |
|
* Copyright (c) 2005, 2010-2011, Wind River Systems |
|
* Copyright (c) 2020-2021, Red Hat Inc |
|
* 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 "link.h" |
|
#include "name_distr.h" |
|
|
|
int sysctl_tipc_named_timeout __read_mostly = 2000; |
|
|
|
struct distr_queue_item { |
|
struct distr_item i; |
|
u32 dtype; |
|
u32 node; |
|
unsigned long expires; |
|
struct list_head next; |
|
}; |
|
|
|
/** |
|
* publ_to_item - add publication info to a publication message |
|
* @p: publication info |
|
* @i: location of item in the message |
|
*/ |
|
static void publ_to_item(struct distr_item *i, struct publication *p) |
|
{ |
|
i->type = htonl(p->sr.type); |
|
i->lower = htonl(p->sr.lower); |
|
i->upper = htonl(p->sr.upper); |
|
i->port = htonl(p->sk.ref); |
|
i->key = htonl(p->key); |
|
} |
|
|
|
/** |
|
* named_prepare_buf - allocate & initialize a publication message |
|
* @net: the associated network namespace |
|
* @type: message type |
|
* @size: payload size |
|
* @dest: destination node |
|
* |
|
* The buffer returned is of size INT_H_SIZE + payload size |
|
*/ |
|
static struct sk_buff *named_prepare_buf(struct net *net, u32 type, u32 size, |
|
u32 dest) |
|
{ |
|
struct sk_buff *buf = tipc_buf_acquire(INT_H_SIZE + size, GFP_ATOMIC); |
|
u32 self = tipc_own_addr(net); |
|
struct tipc_msg *msg; |
|
|
|
if (buf != NULL) { |
|
msg = buf_msg(buf); |
|
tipc_msg_init(self, msg, NAME_DISTRIBUTOR, |
|
type, INT_H_SIZE, dest); |
|
msg_set_size(msg, INT_H_SIZE + size); |
|
} |
|
return buf; |
|
} |
|
|
|
/** |
|
* tipc_named_publish - tell other nodes about a new publication by this node |
|
* @net: the associated network namespace |
|
* @p: the new publication |
|
*/ |
|
struct sk_buff *tipc_named_publish(struct net *net, struct publication *p) |
|
{ |
|
struct name_table *nt = tipc_name_table(net); |
|
struct distr_item *item; |
|
struct sk_buff *skb; |
|
|
|
if (p->scope == TIPC_NODE_SCOPE) { |
|
list_add_tail_rcu(&p->binding_node, &nt->node_scope); |
|
return NULL; |
|
} |
|
write_lock_bh(&nt->cluster_scope_lock); |
|
list_add_tail(&p->binding_node, &nt->cluster_scope); |
|
write_unlock_bh(&nt->cluster_scope_lock); |
|
skb = named_prepare_buf(net, PUBLICATION, ITEM_SIZE, 0); |
|
if (!skb) { |
|
pr_warn("Publication distribution failure\n"); |
|
return NULL; |
|
} |
|
msg_set_named_seqno(buf_msg(skb), nt->snd_nxt++); |
|
msg_set_non_legacy(buf_msg(skb)); |
|
item = (struct distr_item *)msg_data(buf_msg(skb)); |
|
publ_to_item(item, p); |
|
return skb; |
|
} |
|
|
|
/** |
|
* tipc_named_withdraw - tell other nodes about a withdrawn publication by this node |
|
* @net: the associated network namespace |
|
* @p: the withdrawn publication |
|
*/ |
|
struct sk_buff *tipc_named_withdraw(struct net *net, struct publication *p) |
|
{ |
|
struct name_table *nt = tipc_name_table(net); |
|
struct distr_item *item; |
|
struct sk_buff *skb; |
|
|
|
write_lock_bh(&nt->cluster_scope_lock); |
|
list_del(&p->binding_node); |
|
write_unlock_bh(&nt->cluster_scope_lock); |
|
if (p->scope == TIPC_NODE_SCOPE) |
|
return NULL; |
|
|
|
skb = named_prepare_buf(net, WITHDRAWAL, ITEM_SIZE, 0); |
|
if (!skb) { |
|
pr_warn("Withdrawal distribution failure\n"); |
|
return NULL; |
|
} |
|
msg_set_named_seqno(buf_msg(skb), nt->snd_nxt++); |
|
msg_set_non_legacy(buf_msg(skb)); |
|
item = (struct distr_item *)msg_data(buf_msg(skb)); |
|
publ_to_item(item, p); |
|
return skb; |
|
} |
|
|
|
/** |
|
* named_distribute - prepare name info for bulk distribution to another node |
|
* @net: the associated network namespace |
|
* @list: list of messages (buffers) to be returned from this function |
|
* @dnode: node to be updated |
|
* @pls: linked list of publication items to be packed into buffer chain |
|
* @seqno: sequence number for this message |
|
*/ |
|
static void named_distribute(struct net *net, struct sk_buff_head *list, |
|
u32 dnode, struct list_head *pls, u16 seqno) |
|
{ |
|
struct publication *publ; |
|
struct sk_buff *skb = NULL; |
|
struct distr_item *item = NULL; |
|
u32 msg_dsz = ((tipc_node_get_mtu(net, dnode, 0, false) - INT_H_SIZE) / |
|
ITEM_SIZE) * ITEM_SIZE; |
|
u32 msg_rem = msg_dsz; |
|
struct tipc_msg *hdr; |
|
|
|
list_for_each_entry(publ, pls, binding_node) { |
|
/* Prepare next buffer: */ |
|
if (!skb) { |
|
skb = named_prepare_buf(net, PUBLICATION, msg_rem, |
|
dnode); |
|
if (!skb) { |
|
pr_warn("Bulk publication failure\n"); |
|
return; |
|
} |
|
hdr = buf_msg(skb); |
|
msg_set_bc_ack_invalid(hdr, true); |
|
msg_set_bulk(hdr); |
|
msg_set_non_legacy(hdr); |
|
item = (struct distr_item *)msg_data(hdr); |
|
} |
|
|
|
/* Pack publication into message: */ |
|
publ_to_item(item, publ); |
|
item++; |
|
msg_rem -= ITEM_SIZE; |
|
|
|
/* Append full buffer to list: */ |
|
if (!msg_rem) { |
|
__skb_queue_tail(list, skb); |
|
skb = NULL; |
|
msg_rem = msg_dsz; |
|
} |
|
} |
|
if (skb) { |
|
hdr = buf_msg(skb); |
|
msg_set_size(hdr, INT_H_SIZE + (msg_dsz - msg_rem)); |
|
skb_trim(skb, INT_H_SIZE + (msg_dsz - msg_rem)); |
|
__skb_queue_tail(list, skb); |
|
} |
|
hdr = buf_msg(skb_peek_tail(list)); |
|
msg_set_last_bulk(hdr); |
|
msg_set_named_seqno(hdr, seqno); |
|
} |
|
|
|
/** |
|
* tipc_named_node_up - tell specified node about all publications by this node |
|
* @net: the associated network namespace |
|
* @dnode: destination node |
|
* @capabilities: peer node's capabilities |
|
*/ |
|
void tipc_named_node_up(struct net *net, u32 dnode, u16 capabilities) |
|
{ |
|
struct name_table *nt = tipc_name_table(net); |
|
struct tipc_net *tn = tipc_net(net); |
|
struct sk_buff_head head; |
|
u16 seqno; |
|
|
|
__skb_queue_head_init(&head); |
|
spin_lock_bh(&tn->nametbl_lock); |
|
if (!(capabilities & TIPC_NAMED_BCAST)) |
|
nt->rc_dests++; |
|
seqno = nt->snd_nxt; |
|
spin_unlock_bh(&tn->nametbl_lock); |
|
|
|
read_lock_bh(&nt->cluster_scope_lock); |
|
named_distribute(net, &head, dnode, &nt->cluster_scope, seqno); |
|
tipc_node_xmit(net, &head, dnode, 0); |
|
read_unlock_bh(&nt->cluster_scope_lock); |
|
} |
|
|
|
/** |
|
* tipc_publ_purge - remove publication associated with a failed node |
|
* @net: the associated network namespace |
|
* @p: the publication to remove |
|
* @addr: failed node's address |
|
* |
|
* Invoked for each publication issued by a newly failed node. |
|
* Removes publication structure from name table & deletes it. |
|
*/ |
|
static void tipc_publ_purge(struct net *net, struct publication *p, u32 addr) |
|
{ |
|
struct tipc_net *tn = tipc_net(net); |
|
struct publication *_p; |
|
struct tipc_uaddr ua; |
|
|
|
tipc_uaddr(&ua, TIPC_SERVICE_RANGE, p->scope, p->sr.type, |
|
p->sr.lower, p->sr.upper); |
|
spin_lock_bh(&tn->nametbl_lock); |
|
_p = tipc_nametbl_remove_publ(net, &ua, &p->sk, p->key); |
|
if (_p) |
|
tipc_node_unsubscribe(net, &_p->binding_node, addr); |
|
spin_unlock_bh(&tn->nametbl_lock); |
|
if (_p) |
|
kfree_rcu(_p, rcu); |
|
} |
|
|
|
void tipc_publ_notify(struct net *net, struct list_head *nsub_list, |
|
u32 addr, u16 capabilities) |
|
{ |
|
struct name_table *nt = tipc_name_table(net); |
|
struct tipc_net *tn = tipc_net(net); |
|
|
|
struct publication *publ, *tmp; |
|
|
|
list_for_each_entry_safe(publ, tmp, nsub_list, binding_node) |
|
tipc_publ_purge(net, publ, addr); |
|
spin_lock_bh(&tn->nametbl_lock); |
|
if (!(capabilities & TIPC_NAMED_BCAST)) |
|
nt->rc_dests--; |
|
spin_unlock_bh(&tn->nametbl_lock); |
|
} |
|
|
|
/** |
|
* tipc_update_nametbl - try to process a nametable update and notify |
|
* subscribers |
|
* @net: the associated network namespace |
|
* @i: location of item in the message |
|
* @node: node address |
|
* @dtype: name distributor message type |
|
* |
|
* tipc_nametbl_lock must be held. |
|
* Return: the publication item if successful, otherwise NULL. |
|
*/ |
|
static bool tipc_update_nametbl(struct net *net, struct distr_item *i, |
|
u32 node, u32 dtype) |
|
{ |
|
struct publication *p = NULL; |
|
struct tipc_socket_addr sk; |
|
struct tipc_uaddr ua; |
|
u32 key = ntohl(i->key); |
|
|
|
tipc_uaddr(&ua, TIPC_SERVICE_RANGE, TIPC_CLUSTER_SCOPE, |
|
ntohl(i->type), ntohl(i->lower), ntohl(i->upper)); |
|
sk.ref = ntohl(i->port); |
|
sk.node = node; |
|
|
|
if (dtype == PUBLICATION) { |
|
p = tipc_nametbl_insert_publ(net, &ua, &sk, key); |
|
if (p) { |
|
tipc_node_subscribe(net, &p->binding_node, node); |
|
return true; |
|
} |
|
} else if (dtype == WITHDRAWAL) { |
|
p = tipc_nametbl_remove_publ(net, &ua, &sk, key); |
|
if (p) { |
|
tipc_node_unsubscribe(net, &p->binding_node, node); |
|
kfree_rcu(p, rcu); |
|
return true; |
|
} |
|
pr_warn_ratelimited("Failed to remove binding %u,%u from %u\n", |
|
ua.sr.type, ua.sr.lower, node); |
|
} else { |
|
pr_warn("Unrecognized name table message received\n"); |
|
} |
|
return false; |
|
} |
|
|
|
static struct sk_buff *tipc_named_dequeue(struct sk_buff_head *namedq, |
|
u16 *rcv_nxt, bool *open) |
|
{ |
|
struct sk_buff *skb, *tmp; |
|
struct tipc_msg *hdr; |
|
u16 seqno; |
|
|
|
spin_lock_bh(&namedq->lock); |
|
skb_queue_walk_safe(namedq, skb, tmp) { |
|
if (unlikely(skb_linearize(skb))) { |
|
__skb_unlink(skb, namedq); |
|
kfree_skb(skb); |
|
continue; |
|
} |
|
hdr = buf_msg(skb); |
|
seqno = msg_named_seqno(hdr); |
|
if (msg_is_last_bulk(hdr)) { |
|
*rcv_nxt = seqno; |
|
*open = true; |
|
} |
|
|
|
if (msg_is_bulk(hdr) || msg_is_legacy(hdr)) { |
|
__skb_unlink(skb, namedq); |
|
spin_unlock_bh(&namedq->lock); |
|
return skb; |
|
} |
|
|
|
if (*open && (*rcv_nxt == seqno)) { |
|
(*rcv_nxt)++; |
|
__skb_unlink(skb, namedq); |
|
spin_unlock_bh(&namedq->lock); |
|
return skb; |
|
} |
|
|
|
if (less(seqno, *rcv_nxt)) { |
|
__skb_unlink(skb, namedq); |
|
kfree_skb(skb); |
|
continue; |
|
} |
|
} |
|
spin_unlock_bh(&namedq->lock); |
|
return NULL; |
|
} |
|
|
|
/** |
|
* tipc_named_rcv - process name table update messages sent by another node |
|
* @net: the associated network namespace |
|
* @namedq: queue to receive from |
|
* @rcv_nxt: store last received seqno here |
|
* @open: last bulk msg was received (FIXME) |
|
*/ |
|
void tipc_named_rcv(struct net *net, struct sk_buff_head *namedq, |
|
u16 *rcv_nxt, bool *open) |
|
{ |
|
struct tipc_net *tn = tipc_net(net); |
|
struct distr_item *item; |
|
struct tipc_msg *hdr; |
|
struct sk_buff *skb; |
|
u32 count, node; |
|
|
|
spin_lock_bh(&tn->nametbl_lock); |
|
while ((skb = tipc_named_dequeue(namedq, rcv_nxt, open))) { |
|
hdr = buf_msg(skb); |
|
node = msg_orignode(hdr); |
|
item = (struct distr_item *)msg_data(hdr); |
|
count = msg_data_sz(hdr) / ITEM_SIZE; |
|
while (count--) { |
|
tipc_update_nametbl(net, item, node, msg_type(hdr)); |
|
item++; |
|
} |
|
kfree_skb(skb); |
|
} |
|
spin_unlock_bh(&tn->nametbl_lock); |
|
} |
|
|
|
/** |
|
* tipc_named_reinit - re-initialize local publications |
|
* @net: the associated network namespace |
|
* |
|
* This routine is called whenever TIPC networking is enabled. |
|
* All name table entries published by this node are updated to reflect |
|
* the node's new network address. |
|
*/ |
|
void tipc_named_reinit(struct net *net) |
|
{ |
|
struct name_table *nt = tipc_name_table(net); |
|
struct tipc_net *tn = tipc_net(net); |
|
struct publication *p; |
|
u32 self = tipc_own_addr(net); |
|
|
|
spin_lock_bh(&tn->nametbl_lock); |
|
|
|
list_for_each_entry_rcu(p, &nt->node_scope, binding_node) |
|
p->sk.node = self; |
|
list_for_each_entry_rcu(p, &nt->cluster_scope, binding_node) |
|
p->sk.node = self; |
|
nt->rc_dests = 0; |
|
spin_unlock_bh(&tn->nametbl_lock); |
|
}
|
|
|