| /* |
| * net/tipc/name_distr.c: TIPC name distribution code |
| * |
| * Copyright (c) 2000-2006, 2014, Ericsson AB |
| * Copyright (c) 2005, 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 "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 |
| */ |
| static void publ_to_item(struct distr_item *i, struct publication *p) |
| { |
| i->type = htonl(p->type); |
| i->lower = htonl(p->lower); |
| i->upper = htonl(p->upper); |
| i->port = htonl(p->port); |
| i->key = htonl(p->key); |
| } |
| |
| /** |
| * named_prepare_buf - allocate & initialize a publication message |
| * |
| * 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 |
| */ |
| struct sk_buff *tipc_named_publish(struct net *net, struct publication *publ) |
| { |
| struct name_table *nt = tipc_name_table(net); |
| struct distr_item *item; |
| struct sk_buff *skb; |
| |
| if (publ->scope == TIPC_NODE_SCOPE) { |
| list_add_tail_rcu(&publ->binding_node, &nt->node_scope); |
| return NULL; |
| } |
| write_lock_bh(&nt->cluster_scope_lock); |
| list_add_tail(&publ->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, publ); |
| return skb; |
| } |
| |
| /** |
| * tipc_named_withdraw - tell other nodes about a withdrawn publication by this node |
| */ |
| struct sk_buff *tipc_named_withdraw(struct net *net, struct publication *publ) |
| { |
| 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(&publ->binding_node); |
| write_unlock_bh(&nt->cluster_scope_lock); |
| if (publ->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, publ); |
| return skb; |
| } |
| |
| /** |
| * named_distribute - prepare name info for bulk distribution to another node |
| * @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 |
| */ |
| 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 |
| */ |
| 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 |
| * |
| * 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 *publ, u32 addr) |
| { |
| struct tipc_net *tn = tipc_net(net); |
| struct publication *p; |
| |
| spin_lock_bh(&tn->nametbl_lock); |
| p = tipc_nametbl_remove_publ(net, publ->type, publ->lower, publ->upper, |
| publ->node, publ->key); |
| if (p) |
| tipc_node_unsubscribe(net, &p->binding_node, addr); |
| spin_unlock_bh(&tn->nametbl_lock); |
| |
| if (p != publ) { |
| pr_err("Unable to remove publication from failed node\n" |
| " (type=%u, lower=%u, node=0x%x, port=%u, key=%u)\n", |
| publ->type, publ->lower, publ->node, publ->port, |
| publ->key); |
| } |
| |
| if (p) |
| kfree_rcu(p, rcu); |
| } |
| |
| /** |
| * tipc_dist_queue_purge - remove deferred updates from a node that went down |
| */ |
| static void tipc_dist_queue_purge(struct net *net, u32 addr) |
| { |
| struct tipc_net *tn = net_generic(net, tipc_net_id); |
| struct distr_queue_item *e, *tmp; |
| |
| spin_lock_bh(&tn->nametbl_lock); |
| list_for_each_entry_safe(e, tmp, &tn->dist_queue, next) { |
| if (e->node != addr) |
| continue; |
| list_del(&e->next); |
| kfree(e); |
| } |
| spin_unlock_bh(&tn->nametbl_lock); |
| } |
| |
| 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); |
| tipc_dist_queue_purge(net, 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 |
| * |
| * tipc_nametbl_lock must be held. |
| * Returns 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; |
| u32 lower = ntohl(i->lower); |
| u32 upper = ntohl(i->upper); |
| u32 type = ntohl(i->type); |
| u32 port = ntohl(i->port); |
| u32 key = ntohl(i->key); |
| |
| if (dtype == PUBLICATION) { |
| p = tipc_nametbl_insert_publ(net, type, lower, upper, |
| TIPC_CLUSTER_SCOPE, node, |
| port, key); |
| if (p) { |
| tipc_node_subscribe(net, &p->binding_node, node); |
| return true; |
| } |
| } else if (dtype == WITHDRAWAL) { |
| p = tipc_nametbl_remove_publ(net, type, lower, |
| upper, node, 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 %x\n", |
| type, 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; |
| |
| skb_queue_walk_safe(namedq, skb, tmp) { |
| skb_linearize(skb); |
| 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); |
| return skb; |
| } |
| |
| if (*open && (*rcv_nxt == seqno)) { |
| (*rcv_nxt)++; |
| __skb_unlink(skb, namedq); |
| return skb; |
| } |
| |
| if (less(seqno, *rcv_nxt)) { |
| __skb_unlink(skb, namedq); |
| kfree_skb(skb); |
| continue; |
| } |
| } |
| return NULL; |
| } |
| |
| /** |
| * tipc_named_rcv - process name table update messages sent by another node |
| */ |
| 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 |
| * |
| * 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 *publ; |
| u32 self = tipc_own_addr(net); |
| |
| spin_lock_bh(&tn->nametbl_lock); |
| |
| list_for_each_entry_rcu(publ, &nt->node_scope, binding_node) |
| publ->node = self; |
| list_for_each_entry_rcu(publ, &nt->cluster_scope, binding_node) |
| publ->node = self; |
| nt->rc_dests = 0; |
| spin_unlock_bh(&tn->nametbl_lock); |
| } |