--- zzzz-none-000/linux-3.10.107/net/tipc/discover.c	2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/net/tipc/discover.c	2021-02-04 17:41:59.000000000 +0000
@@ -1,7 +1,7 @@
 /*
  * net/tipc/discover.c
  *
- * Copyright (c) 2003-2006, Ericsson AB
+ * Copyright (c) 2003-2006, 2014-2015, Ericsson AB
  * Copyright (c) 2005-2006, 2010-2011, Wind River Systems
  * All rights reserved.
  *
@@ -35,58 +35,64 @@
  */
 
 #include "core.h"
-#include "link.h"
+#include "node.h"
 #include "discover.h"
 
-#define TIPC_LINK_REQ_INIT	125	/* min delay during bearer start up */
-#define TIPC_LINK_REQ_FAST	1000	/* max delay if bearer has no links */
-#define TIPC_LINK_REQ_SLOW	60000	/* max delay if bearer has links */
-#define TIPC_LINK_REQ_INACTIVE	0xffffffff /* indicates no timer in use */
-
+/* min delay during bearer start up */
+#define TIPC_LINK_REQ_INIT	msecs_to_jiffies(125)
+/* max delay if bearer has no links */
+#define TIPC_LINK_REQ_FAST	msecs_to_jiffies(1000)
+/* max delay if bearer has links */
+#define TIPC_LINK_REQ_SLOW	msecs_to_jiffies(60000)
+/* indicates no timer in use */
+#define TIPC_LINK_REQ_INACTIVE	0xffffffff
 
 /**
  * struct tipc_link_req - information about an ongoing link setup request
- * @bearer: bearer issuing requests
+ * @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
  * @buf: request message to be (repeatedly) sent
  * @timer: timer governing period between requests
  * @timer_intv: current interval between requests (in ms)
  */
 struct tipc_link_req {
-	struct tipc_bearer *bearer;
+	u32 bearer_id;
 	struct tipc_media_addr dest;
+	struct net *net;
 	u32 domain;
 	int num_nodes;
+	spinlock_t lock;
 	struct sk_buff *buf;
 	struct timer_list timer;
-	unsigned int timer_intv;
+	unsigned long timer_intv;
 };
 
 /**
  * tipc_disc_init_msg - initialize a link setup message
+ * @net: the applicable net namespace
  * @type: message type (request or response)
- * @dest_domain: network domain of node(s) which should respond to message
  * @b_ptr: ptr to bearer issuing message
  */
-static struct sk_buff *tipc_disc_init_msg(u32 type,
-					  u32 dest_domain,
-					  struct tipc_bearer *b_ptr)
+static void tipc_disc_init_msg(struct net *net, struct sk_buff *buf, u32 type,
+			       struct tipc_bearer *b_ptr)
 {
-	struct sk_buff *buf = tipc_buf_acquire(INT_H_SIZE);
+	struct tipc_net *tn = net_generic(net, tipc_net_id);
 	struct tipc_msg *msg;
+	u32 dest_domain = b_ptr->domain;
 
-	if (buf) {
-		msg = buf_msg(buf);
-		tipc_msg_init(msg, LINK_CONFIG, type, INT_H_SIZE, dest_domain);
-		msg_set_non_seq(msg, 1);
-		msg_set_node_sig(msg, tipc_random);
-		msg_set_dest_domain(msg, dest_domain);
-		msg_set_bc_netid(msg, tipc_net_id);
-		b_ptr->media->addr2msg(&b_ptr->addr, msg_media_addr(msg));
-	}
-	return buf;
+	msg = buf_msg(buf);
+	tipc_msg_init(tn->own_addr, msg, LINK_CONFIG, type,
+		      MAX_H_SIZE, dest_domain);
+	msg_set_non_seq(msg, 1);
+	msg_set_node_sig(msg, tn->random);
+	msg_set_node_capabilities(msg, TIPC_NODE_CAPABILITIES);
+	msg_set_dest_domain(msg, dest_domain);
+	msg_set_bc_netid(msg, tn->net_id);
+	b_ptr->media->addr2msg(msg_media_addr(msg), &b_ptr->addr);
 }
 
 /**
@@ -109,146 +115,63 @@
 }
 
 /**
- * tipc_disc_recv_msg - handle incoming link setup message (request or response)
+ * tipc_disc_rcv - handle incoming discovery message (request or response)
+ * @net: the applicable net namespace
  * @buf: buffer containing message
- * @b_ptr: bearer that message arrived on
+ * @bearer: bearer that message arrived on
  */
-void tipc_disc_recv_msg(struct sk_buff *buf, struct tipc_bearer *b_ptr)
+void tipc_disc_rcv(struct net *net, struct sk_buff *skb,
+		   struct tipc_bearer *bearer)
 {
-	struct tipc_node *n_ptr;
-	struct tipc_link *link;
-	struct tipc_media_addr media_addr;
-	struct sk_buff *rbuf;
-	struct tipc_msg *msg = buf_msg(buf);
-	u32 dest = msg_dest_domain(msg);
-	u32 orig = msg_prevnode(msg);
-	u32 net_id = msg_bc_netid(msg);
-	u32 type = msg_type(msg);
-	u32 signature = msg_node_sig(msg);
-	int addr_mismatch;
-	int link_fully_up;
-
-	media_addr.broadcast = 1;
-	b_ptr->media->msg2addr(b_ptr, &media_addr, msg_media_addr(msg));
-	kfree_skb(buf);
+	struct tipc_net *tn = net_generic(net, tipc_net_id);
+	struct tipc_media_addr maddr;
+	struct sk_buff *rskb;
+	struct tipc_msg *hdr = buf_msg(skb);
+	u32 ddom = msg_dest_domain(hdr);
+	u32 onode = msg_prevnode(hdr);
+	u32 net_id = msg_bc_netid(hdr);
+	u32 mtyp = msg_type(hdr);
+	u32 signature = msg_node_sig(hdr);
+	u16 caps = msg_node_capabilities(hdr);
+	bool respond = false;
+	bool dupl_addr = false;
+
+	bearer->media->msg2addr(bearer, &maddr, msg_media_addr(hdr));
+	kfree_skb(skb);
 
 	/* Ensure message from node is valid and communication is permitted */
-	if (net_id != tipc_net_id)
+	if (net_id != tn->net_id)
 		return;
-	if (media_addr.broadcast)
+	if (maddr.broadcast)
 		return;
-	if (!tipc_addr_domain_valid(dest))
+	if (!tipc_addr_domain_valid(ddom))
 		return;
-	if (!tipc_addr_node_valid(orig))
+	if (!tipc_addr_node_valid(onode))
 		return;
-	if (orig == tipc_own_addr) {
-		if (memcmp(&media_addr, &b_ptr->addr, sizeof(media_addr)))
-			disc_dupl_alert(b_ptr, tipc_own_addr, &media_addr);
+
+	if (in_own_node(net, onode)) {
+		if (memcmp(&maddr, &bearer->addr, sizeof(maddr)))
+			disc_dupl_alert(bearer, tn->own_addr, &maddr);
 		return;
 	}
-	if (!tipc_in_scope(dest, tipc_own_addr))
+	if (!tipc_in_scope(ddom, tn->own_addr))
 		return;
-	if (!tipc_in_scope(b_ptr->link_req->domain, orig))
+	if (!tipc_in_scope(bearer->domain, onode))
 		return;
 
-	/* Locate structure corresponding to requesting node */
-	n_ptr = tipc_node_find(orig);
-	if (!n_ptr) {
-		n_ptr = tipc_node_create(orig);
-		if (!n_ptr)
-			return;
-	}
-	tipc_node_lock(n_ptr);
-
-	/* Prepare to validate requesting node's signature and media address */
-	link = n_ptr->links[b_ptr->identity];
-	addr_mismatch = (link != NULL) &&
-		memcmp(&link->media_addr, &media_addr, sizeof(media_addr));
-
-	/*
-	 * Ensure discovery message's signature is correct
-	 *
-	 * If signature is incorrect and there is no working link to the node,
-	 * accept the new signature but invalidate all existing links to the
-	 * node so they won't re-activate without a new discovery message.
-	 *
-	 * If signature is incorrect and the requested link to the node is
-	 * working, accept the new signature. (This is an instance of delayed
-	 * rediscovery, where a link endpoint was able to re-establish contact
-	 * with its peer endpoint on a node that rebooted before receiving a
-	 * discovery message from that node.)
-	 *
-	 * If signature is incorrect and there is a working link to the node
-	 * that is not the requested link, reject the request (must be from
-	 * a duplicate node).
-	 */
-	if (signature != n_ptr->signature) {
-		if (n_ptr->working_links == 0) {
-			struct tipc_link *curr_link;
-			int i;
-
-			for (i = 0; i < MAX_BEARERS; i++) {
-				curr_link = n_ptr->links[i];
-				if (curr_link) {
-					memset(&curr_link->media_addr, 0,
-					       sizeof(media_addr));
-					tipc_link_reset(curr_link);
-				}
-			}
-			addr_mismatch = (link != NULL);
-		} else if (tipc_link_is_up(link) && !addr_mismatch) {
-			/* delayed rediscovery */
-		} else {
-			disc_dupl_alert(b_ptr, orig, &media_addr);
-			tipc_node_unlock(n_ptr);
-			return;
-		}
-		n_ptr->signature = signature;
-	}
-
-	/*
-	 * Ensure requesting node's media address is correct
-	 *
-	 * If media address doesn't match and the link is working, reject the
-	 * request (must be from a duplicate node).
-	 *
-	 * If media address doesn't match and the link is not working, accept
-	 * the new media address and reset the link to ensure it starts up
-	 * cleanly.
-	 */
-	if (addr_mismatch) {
-		if (tipc_link_is_up(link)) {
-			disc_dupl_alert(b_ptr, orig, &media_addr);
-			tipc_node_unlock(n_ptr);
-			return;
-		} else {
-			memcpy(&link->media_addr, &media_addr,
-			       sizeof(media_addr));
-			tipc_link_reset(link);
-		}
-	}
-
-	/* Create a link endpoint for this bearer, if necessary */
-	if (!link) {
-		link = tipc_link_create(n_ptr, b_ptr, &media_addr);
-		if (!link) {
-			tipc_node_unlock(n_ptr);
+	tipc_node_check_dest(net, onode, bearer, caps, signature,
+			     &maddr, &respond, &dupl_addr);
+	if (dupl_addr)
+		disc_dupl_alert(bearer, onode, &maddr);
+
+	/* Send response, if necessary */
+	if (respond && (mtyp == DSC_REQ_MSG)) {
+		rskb = tipc_buf_acquire(MAX_H_SIZE);
+		if (!rskb)
 			return;
-		}
+		tipc_disc_init_msg(net, rskb, DSC_RESP_MSG, bearer);
+		tipc_bearer_xmit_skb(net, bearer->identity, rskb, &maddr);
 	}
-
-	/* Accept discovery message & send response, if necessary */
-	link_fully_up = link_working_working(link);
-
-	if ((type == DSC_REQ_MSG) && !link_fully_up && !b_ptr->blocked) {
-		rbuf = tipc_disc_init_msg(DSC_RESP_MSG, orig, b_ptr);
-		if (rbuf) {
-			tipc_bearer_send(b_ptr, rbuf, &media_addr);
-			kfree_skb(rbuf);
-		}
-	}
-
-	tipc_node_unlock(n_ptr);
 }
 
 /**
@@ -264,7 +187,7 @@
 		if ((req->timer_intv == TIPC_LINK_REQ_INACTIVE) ||
 		    (req->timer_intv > TIPC_LINK_REQ_FAST)) {
 			req->timer_intv = TIPC_LINK_REQ_INIT;
-			k_start_timer(&req->timer, req->timer_intv);
+			mod_timer(&req->timer, jiffies + req->timer_intv);
 		}
 	}
 }
@@ -275,7 +198,9 @@
  */
 void tipc_disc_add_dest(struct tipc_link_req *req)
 {
+	spin_lock_bh(&req->lock);
 	req->num_nodes++;
+	spin_unlock_bh(&req->lock);
 }
 
 /**
@@ -284,31 +209,25 @@
  */
 void tipc_disc_remove_dest(struct tipc_link_req *req)
 {
+	spin_lock_bh(&req->lock);
 	req->num_nodes--;
 	disc_update(req);
-}
-
-/**
- * disc_send_msg - send link setup request message
- * @req: ptr to link request structure
- */
-static void disc_send_msg(struct tipc_link_req *req)
-{
-	if (!req->bearer->blocked)
-		tipc_bearer_send(req->bearer, req->buf, &req->dest);
+	spin_unlock_bh(&req->lock);
 }
 
 /**
  * disc_timeout - send a periodic link setup request
- * @req: ptr to link request structure
+ * @data: ptr to link request structure
  *
  * Called whenever a link setup request timer associated with a bearer expires.
  */
-static void disc_timeout(struct tipc_link_req *req)
+static void disc_timeout(unsigned long data)
 {
+	struct tipc_link_req *req = (struct tipc_link_req *)data;
+	struct sk_buff *skb;
 	int max_delay;
 
-	spin_lock_bh(&req->bearer->lock);
+	spin_lock_bh(&req->lock);
 
 	/* Stop searching if only desired node has been found */
 	if (tipc_node(req->domain) && req->num_nodes) {
@@ -323,8 +242,9 @@
 	 * hold at fast polling rate if don't have any associated nodes,
 	 * otherwise hold at slow polling rate
 	 */
-	disc_send_msg(req);
-
+	skb = skb_clone(req->buf, GFP_ATOMIC);
+	if (skb)
+		tipc_bearer_xmit_skb(req->net, req->bearer_id, skb, &req->dest);
 	req->timer_intv *= 2;
 	if (req->num_nodes)
 		max_delay = TIPC_LINK_REQ_SLOW;
@@ -333,43 +253,49 @@
 	if (req->timer_intv > max_delay)
 		req->timer_intv = max_delay;
 
-	k_start_timer(&req->timer, req->timer_intv);
+	mod_timer(&req->timer, jiffies + req->timer_intv);
 exit:
-	spin_unlock_bh(&req->bearer->lock);
+	spin_unlock_bh(&req->lock);
 }
 
 /**
  * tipc_disc_create - create object to send periodic link setup requests
+ * @net: the applicable net namespace
  * @b_ptr: 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 tipc_bearer *b_ptr,
-		     struct tipc_media_addr *dest, u32 dest_domain)
+int tipc_disc_create(struct net *net, struct tipc_bearer *b_ptr,
+		     struct tipc_media_addr *dest)
 {
 	struct tipc_link_req *req;
+	struct sk_buff *skb;
 
 	req = kmalloc(sizeof(*req), GFP_ATOMIC);
 	if (!req)
 		return -ENOMEM;
-
-	req->buf = tipc_disc_init_msg(DSC_REQ_MSG, dest_domain, b_ptr);
+	req->buf = tipc_buf_acquire(MAX_H_SIZE);
 	if (!req->buf) {
 		kfree(req);
-		return -ENOMSG;
+		return -ENOMEM;
 	}
 
+	tipc_disc_init_msg(net, req->buf, DSC_REQ_MSG, b_ptr);
 	memcpy(&req->dest, dest, sizeof(*dest));
-	req->bearer = b_ptr;
-	req->domain = dest_domain;
+	req->net = net;
+	req->bearer_id = b_ptr->identity;
+	req->domain = b_ptr->domain;
 	req->num_nodes = 0;
 	req->timer_intv = TIPC_LINK_REQ_INIT;
-	k_init_timer(&req->timer, (Handler)disc_timeout, (unsigned long)req);
-	k_start_timer(&req->timer, req->timer_intv);
+	spin_lock_init(&req->lock);
+	setup_timer(&req->timer, disc_timeout, (unsigned long)req);
+	mod_timer(&req->timer, jiffies + req->timer_intv);
 	b_ptr->link_req = req;
-	disc_send_msg(req);
+	skb = skb_clone(req->buf, GFP_ATOMIC);
+	if (skb)
+		tipc_bearer_xmit_skb(net, req->bearer_id, skb, &req->dest);
 	return 0;
 }
 
@@ -379,8 +305,32 @@
  */
 void tipc_disc_delete(struct tipc_link_req *req)
 {
-	k_cancel_timer(&req->timer);
-	k_term_timer(&req->timer);
+	del_timer_sync(&req->timer);
 	kfree_skb(req->buf);
 	kfree(req);
 }
+
+/**
+ * tipc_disc_reset - reset object to send periodic link setup requests
+ * @net: the applicable net namespace
+ * @b_ptr: 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_ptr)
+{
+	struct tipc_link_req *req = b_ptr->link_req;
+	struct sk_buff *skb;
+
+	spin_lock_bh(&req->lock);
+	tipc_disc_init_msg(net, req->buf, DSC_REQ_MSG, b_ptr);
+	req->net = net;
+	req->bearer_id = b_ptr->identity;
+	req->domain = b_ptr->domain;
+	req->num_nodes = 0;
+	req->timer_intv = TIPC_LINK_REQ_INIT;
+	mod_timer(&req->timer, jiffies + req->timer_intv);
+	skb = skb_clone(req->buf, GFP_ATOMIC);
+	if (skb)
+		tipc_bearer_xmit_skb(net, req->bearer_id, skb, &req->dest);
+	spin_unlock_bh(&req->lock);
+}