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-rw-r--r--net/tipc/net.c350
1 files changed, 246 insertions, 104 deletions
diff --git a/net/tipc/net.c b/net/tipc/net.c
index 7d305ecc09c2..7e65d0b0c4a8 100644
--- a/net/tipc/net.c
+++ b/net/tipc/net.c
@@ -1,7 +1,7 @@
/*
* net/tipc/net.c: TIPC network routing code
*
- * Copyright (c) 1995-2006, Ericsson AB
+ * Copyright (c) 1995-2006, 2014, Ericsson AB
* Copyright (c) 2005, 2010-2011, Wind River Systems
* All rights reserved.
*
@@ -38,46 +38,44 @@
#include "net.h"
#include "name_distr.h"
#include "subscr.h"
-#include "port.h"
+#include "socket.h"
#include "node.h"
-#include "config.h"
+#include "bcast.h"
+#include "link.h"
+#include "netlink.h"
+#include "monitor.h"
/*
* The TIPC locking policy is designed to ensure a very fine locking
* granularity, permitting complete parallel access to individual
- * port and node/link instances. The code consists of three major
+ * port and node/link instances. The code consists of four major
* locking domains, each protected with their own disjunct set of locks.
*
- * 1: The routing hierarchy.
- * Comprises the structures 'zone', 'cluster', 'node', 'link'
- * and 'bearer'. The whole hierarchy is protected by a big
- * read/write lock, tipc_net_lock, to enssure that nothing is added
- * or removed while code is accessing any of these structures.
- * This layer must not be called from the two others while they
- * hold any of their own locks.
- * Neither must it itself do any upcalls to the other two before
- * it has released tipc_net_lock and other protective locks.
+ * 1: The bearer level.
+ * RTNL lock is used to serialize the process of configuring bearer
+ * on update side, and RCU lock is applied on read side to make
+ * bearer instance valid on both paths of message transmission and
+ * reception.
*
- * Within the tipc_net_lock domain there are two sub-domains;'node' and
- * 'bearer', where local write operations are permitted,
- * provided that those are protected by individual spin_locks
- * per instance. Code holding tipc_net_lock(read) and a node spin_lock
- * is permitted to poke around in both the node itself and its
- * subordinate links. I.e, it can update link counters and queues,
- * change link state, send protocol messages, and alter the
- * "active_links" array in the node; but it can _not_ remove a link
- * or a node from the overall structure.
- * Correspondingly, individual bearers may change status within a
- * tipc_net_lock(read), protected by an individual spin_lock ber bearer
- * instance, but it needs tipc_net_lock(write) to remove/add any bearers.
+ * 2: The node and link level.
+ * All node instances are saved into two tipc_node_list and node_htable
+ * lists. The two lists are protected by node_list_lock on write side,
+ * and they are guarded with RCU lock on read side. Especially node
+ * instance is destroyed only when TIPC module is removed, and we can
+ * confirm that there has no any user who is accessing the node at the
+ * moment. Therefore, Except for iterating the two lists within RCU
+ * protection, it's no needed to hold RCU that we access node instance
+ * in other places.
*
+ * In addition, all members in node structure including link instances
+ * are protected by node spin lock.
*
- * 2: The transport level of the protocol.
- * This consists of the structures port, (and its user level
- * representations, such as user_port and tipc_sock), reference and
- * tipc_user (port.c, reg.c, socket.c).
+ * 3: The transport level of the protocol.
+ * This consists of the structures port, (and its user level
+ * representations, such as user_port and tipc_sock), reference and
+ * tipc_user (port.c, reg.c, socket.c).
*
- * This layer has four different locks:
+ * This layer has four different locks:
* - The tipc_port spin_lock. This is protecting each port instance
* from parallel data access and removal. Since we can not place
* this lock in the port itself, it has been placed in the
@@ -92,11 +90,11 @@
* - A spin lock to protect the registry of kernel/driver users (reg.c)
* - A global spin_lock (tipc_port_lock), which only task is to ensure
* consistency where more than one port is involved in an operation,
- * i.e., whe a port is part of a linked list of ports.
+ * i.e., when a port is part of a linked list of ports.
* There are two such lists; 'port_list', which is used for management,
* and 'wait_list', which is used to queue ports during congestion.
*
- * 3: The name table (name_table.c, name_distr.c, subscription.c)
+ * 4: The name table (name_table.c, name_distr.c, subscription.c)
* - There is one big read/write-lock (tipc_nametbl_lock) protecting the
* overall name table structure. Nothing must be added/removed to
* this structure without holding write access to it.
@@ -108,98 +106,242 @@
* - A local spin_lock protecting the queue of subscriber events.
*/
-DEFINE_RWLOCK(tipc_net_lock);
+static void tipc_net_finalize(struct net *net, u32 addr);
-static void net_route_named_msg(struct sk_buff *buf)
+int tipc_net_init(struct net *net, u8 *node_id, u32 addr)
{
- struct tipc_msg *msg = buf_msg(buf);
- u32 dnode;
- u32 dport;
-
- if (!msg_named(msg)) {
- kfree_skb(buf);
- return;
+ if (tipc_own_id(net)) {
+ pr_info("Cannot configure node identity twice\n");
+ return -1;
}
+ pr_info("Started in network mode\n");
- dnode = addr_domain(msg_lookup_scope(msg));
- dport = tipc_nametbl_translate(msg_nametype(msg), msg_nameinst(msg), &dnode);
- if (dport) {
- msg_set_destnode(msg, dnode);
- msg_set_destport(msg, dport);
- tipc_net_route_msg(buf);
- return;
- }
- tipc_reject_msg(buf, TIPC_ERR_NO_NAME);
+ if (node_id)
+ tipc_set_node_id(net, node_id);
+ if (addr)
+ tipc_net_finalize(net, addr);
+ return 0;
}
-void tipc_net_route_msg(struct sk_buff *buf)
+static void tipc_net_finalize(struct net *net, u32 addr)
{
- struct tipc_msg *msg;
- u32 dnode;
+ struct tipc_net *tn = tipc_net(net);
+ struct tipc_socket_addr sk = {0, addr};
+ struct tipc_uaddr ua;
+
+ tipc_uaddr(&ua, TIPC_SERVICE_RANGE, TIPC_CLUSTER_SCOPE,
+ TIPC_NODE_STATE, addr, addr);
- if (!buf)
+ if (cmpxchg(&tn->node_addr, 0, addr))
return;
- msg = buf_msg(buf);
-
- /* Handle message for this node */
- dnode = msg_short(msg) ? tipc_own_addr : msg_destnode(msg);
- if (tipc_in_scope(dnode, tipc_own_addr)) {
- if (msg_isdata(msg)) {
- if (msg_mcast(msg))
- tipc_port_recv_mcast(buf, NULL);
- else if (msg_destport(msg))
- tipc_port_recv_msg(buf);
- else
- net_route_named_msg(buf);
- return;
- }
- switch (msg_user(msg)) {
- case NAME_DISTRIBUTOR:
- tipc_named_recv(buf);
- break;
- case CONN_MANAGER:
- tipc_port_recv_proto_msg(buf);
- break;
- default:
- kfree_skb(buf);
- }
+ tipc_set_node_addr(net, addr);
+ tipc_named_reinit(net);
+ tipc_sk_reinit(net);
+ tipc_mon_reinit_self(net);
+ tipc_nametbl_publish(net, &ua, &sk, addr);
+}
+
+void tipc_net_finalize_work(struct work_struct *work)
+{
+ struct tipc_net *tn = container_of(work, struct tipc_net, work);
+
+ rtnl_lock();
+ tipc_net_finalize(tipc_link_net(tn->bcl), tn->trial_addr);
+ rtnl_unlock();
+}
+
+void tipc_net_stop(struct net *net)
+{
+ if (!tipc_own_id(net))
return;
+
+ rtnl_lock();
+ tipc_bearer_stop(net);
+ tipc_node_stop(net);
+ rtnl_unlock();
+
+ pr_info("Left network mode\n");
+}
+
+static int __tipc_nl_add_net(struct net *net, struct tipc_nl_msg *msg)
+{
+ struct tipc_net *tn = net_generic(net, tipc_net_id);
+ u64 *w0 = (u64 *)&tn->node_id[0];
+ u64 *w1 = (u64 *)&tn->node_id[8];
+ struct nlattr *attrs;
+ void *hdr;
+
+ hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
+ NLM_F_MULTI, TIPC_NL_NET_GET);
+ if (!hdr)
+ return -EMSGSIZE;
+
+ attrs = nla_nest_start_noflag(msg->skb, TIPC_NLA_NET);
+ if (!attrs)
+ goto msg_full;
+
+ if (nla_put_u32(msg->skb, TIPC_NLA_NET_ID, tn->net_id))
+ goto attr_msg_full;
+ if (nla_put_u64_64bit(msg->skb, TIPC_NLA_NET_NODEID, *w0, 0))
+ goto attr_msg_full;
+ if (nla_put_u64_64bit(msg->skb, TIPC_NLA_NET_NODEID_W1, *w1, 0))
+ 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_net_dump(struct sk_buff *skb, struct netlink_callback *cb)
+{
+ struct net *net = sock_net(skb->sk);
+ int err;
+ int done = cb->args[0];
+ 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;
+
+ err = __tipc_nl_add_net(net, &msg);
+ if (err)
+ goto out;
+
+ done = 1;
+out:
+ cb->args[0] = done;
+
+ return skb->len;
+}
+
+int __tipc_nl_net_set(struct sk_buff *skb, struct genl_info *info)
+{
+ struct nlattr *attrs[TIPC_NLA_NET_MAX + 1];
+ struct net *net = sock_net(skb->sk);
+ struct tipc_net *tn = tipc_net(net);
+ int err;
+
+ if (!info->attrs[TIPC_NLA_NET])
+ return -EINVAL;
+
+ err = nla_parse_nested_deprecated(attrs, TIPC_NLA_NET_MAX,
+ info->attrs[TIPC_NLA_NET],
+ tipc_nl_net_policy, info->extack);
+
+ if (err)
+ return err;
+
+ /* Can't change net id once TIPC has joined a network */
+ if (tipc_own_addr(net))
+ return -EPERM;
+
+ if (attrs[TIPC_NLA_NET_ID]) {
+ u32 val;
+
+ val = nla_get_u32(attrs[TIPC_NLA_NET_ID]);
+ if (val < 1 || val > 9999)
+ return -EINVAL;
+
+ tn->net_id = val;
+ }
+
+ if (attrs[TIPC_NLA_NET_ADDR]) {
+ u32 addr;
+
+ addr = nla_get_u32(attrs[TIPC_NLA_NET_ADDR]);
+ if (!addr)
+ return -EINVAL;
+ tn->legacy_addr_format = true;
+ tipc_net_init(net, NULL, addr);
+ }
+
+ if (attrs[TIPC_NLA_NET_NODEID]) {
+ u8 node_id[NODE_ID_LEN];
+ u64 *w0 = (u64 *)&node_id[0];
+ u64 *w1 = (u64 *)&node_id[8];
+
+ if (!attrs[TIPC_NLA_NET_NODEID_W1])
+ return -EINVAL;
+ *w0 = nla_get_u64(attrs[TIPC_NLA_NET_NODEID]);
+ *w1 = nla_get_u64(attrs[TIPC_NLA_NET_NODEID_W1]);
+ tipc_net_init(net, node_id, 0);
}
+ return 0;
+}
+
+int tipc_nl_net_set(struct sk_buff *skb, struct genl_info *info)
+{
+ int err;
- /* Handle message for another node */
- skb_trim(buf, msg_size(msg));
- tipc_link_send(buf, dnode, msg_link_selector(msg));
+ rtnl_lock();
+ err = __tipc_nl_net_set(skb, info);
+ rtnl_unlock();
+
+ return err;
}
-void tipc_net_start(u32 addr)
+static int __tipc_nl_addr_legacy_get(struct net *net, struct tipc_nl_msg *msg)
{
- char addr_string[16];
+ struct tipc_net *tn = tipc_net(net);
+ struct nlattr *attrs;
+ void *hdr;
- write_lock_bh(&tipc_net_lock);
- tipc_own_addr = addr;
- tipc_named_reinit();
- tipc_port_reinit();
- tipc_bclink_init();
- write_unlock_bh(&tipc_net_lock);
+ hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
+ 0, TIPC_NL_ADDR_LEGACY_GET);
+ if (!hdr)
+ return -EMSGSIZE;
- tipc_cfg_reinit();
+ attrs = nla_nest_start(msg->skb, TIPC_NLA_NET);
+ if (!attrs)
+ goto msg_full;
- pr_info("Started in network mode\n");
- pr_info("Own node address %s, network identity %u\n",
- tipc_addr_string_fill(addr_string, tipc_own_addr), tipc_net_id);
+ if (tn->legacy_addr_format)
+ if (nla_put_flag(msg->skb, TIPC_NLA_NET_ADDR_LEGACY))
+ 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;
}
-void tipc_net_stop(void)
+int tipc_nl_net_addr_legacy_get(struct sk_buff *skb, struct genl_info *info)
{
- struct tipc_node *node, *t_node;
+ struct net *net = sock_net(skb->sk);
+ struct tipc_nl_msg msg;
+ struct sk_buff *rep;
+ int err;
- if (!tipc_own_addr)
- return;
- write_lock_bh(&tipc_net_lock);
- tipc_bearer_stop();
- tipc_bclink_stop();
- list_for_each_entry_safe(node, t_node, &tipc_node_list, list)
- tipc_node_delete(node);
- write_unlock_bh(&tipc_net_lock);
- pr_info("Left network mode\n");
+ rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
+ if (!rep)
+ return -ENOMEM;
+
+ msg.skb = rep;
+ msg.portid = info->snd_portid;
+ msg.seq = info->snd_seq;
+
+ err = __tipc_nl_addr_legacy_get(net, &msg);
+ if (err) {
+ nlmsg_free(msg.skb);
+ return err;
+ }
+
+ return genlmsg_reply(msg.skb, info);
}
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