From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 20:49:45 +0200 Subject: Adding upstream version 6.1.76. Signed-off-by: Daniel Baumann --- net/tipc/name_distr.c | 411 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 411 insertions(+) create mode 100644 net/tipc/name_distr.c (limited to 'net/tipc/name_distr.c') diff --git a/net/tipc/name_distr.c b/net/tipc/name_distr.c new file mode 100644 index 000000000..190b49c5c --- /dev/null +++ b/net/tipc/name_distr.c @@ -0,0 +1,411 @@ +/* + * 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; + +/** + * 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_ratelimited("Unknown 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); +} -- cgit v1.2.3