Commit 7d231e3f authored by David S. Miller's avatar David S. Miller
Browse files

Merge branch 'tipc-next' 



Jon Maloy says:

====================
tipc: resolve message disordering problem

When TIPC receives messages from multi-threaded device drivers it may
occasionally deliver messages to their destination sockets in the wrong
order. This happens despite correct resequencing at the link layer,
because the upcall path from link to socket is not protected by any
locks.

These commits solve this problem by introducing an 'input' message
queue in each link, through which messages must be delivered to the
upper layers.
====================

Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parents 4134069f cb1b7280

net/tipc/bcast.c

+46 −75
Original line number Diff line number Diff line 
/*

 * net/tipc/bcast.c: TIPC broadcast code

 *

 * Copyright (c) 2004-2006, 2014, Ericsson AB

 * Copyright (c) 2004-2006, 2014-2015, Ericsson AB

 * Copyright (c) 2004, Intel Corporation.

 * Copyright (c) 2005, 2010-2011, Wind River Systems

 * All rights reserved.
@@ -79,6 +79,13 @@ static void tipc_bclink_unlock(struct net *net) 
		tipc_link_reset_all(node);

}



void tipc_bclink_input(struct net *net)

{

	struct tipc_net *tn = net_generic(net, tipc_net_id);



	tipc_sk_mcast_rcv(net, &tn->bclink->arrvq, &tn->bclink->inputq);

}



uint  tipc_bclink_get_mtu(void)

{

	return MAX_PKT_DEFAULT_MCAST;
@@ -189,10 +196,8 @@ static void bclink_retransmit_pkt(struct tipc_net *tn, u32 after, u32 to) 
void tipc_bclink_wakeup_users(struct net *net)

{

	struct tipc_net *tn = net_generic(net, tipc_net_id);

	struct sk_buff *skb;



	while ((skb = skb_dequeue(&tn->bclink->link.waiting_sks)))

		tipc_sk_rcv(net, skb);

	tipc_sk_rcv(net, &tn->bclink->link.wakeupq);

}



/**
@@ -271,9 +276,8 @@ void tipc_bclink_acknowledge(struct tipc_node *n_ptr, u32 acked) 
		tipc_link_push_packets(tn->bcl);

		bclink_set_last_sent(net);

	}

	if (unlikely(released && !skb_queue_empty(&tn->bcl->waiting_sks)))

	if (unlikely(released && !skb_queue_empty(&tn->bcl->wakeupq)))

		n_ptr->action_flags |= TIPC_WAKEUP_BCAST_USERS;



exit:

	tipc_bclink_unlock(net);

}
@@ -283,10 +287,11 @@ exit: 
 *

 * RCU and node lock set

 */

void tipc_bclink_update_link_state(struct net *net, struct tipc_node *n_ptr,

void tipc_bclink_update_link_state(struct tipc_node *n_ptr,

				   u32 last_sent)

{

	struct sk_buff *buf;

	struct net *net = n_ptr->net;

	struct tipc_net *tn = net_generic(net, tipc_net_id);



	/* Ignore "stale" link state info */
@@ -317,7 +322,7 @@ void tipc_bclink_update_link_state(struct net *net, struct tipc_node *n_ptr, 
		struct sk_buff *skb = skb_peek(&n_ptr->bclink.deferred_queue);

		u32 to = skb ? buf_seqno(skb) - 1 : n_ptr->bclink.last_sent;



		tipc_msg_init(net, msg, BCAST_PROTOCOL, STATE_MSG,

		tipc_msg_init(tn->own_addr, msg, BCAST_PROTOCOL, STATE_MSG,

			      INT_H_SIZE, n_ptr->addr);

		msg_set_non_seq(msg, 1);

		msg_set_mc_netid(msg, tn->net_id);
@@ -358,7 +363,7 @@ static void bclink_peek_nack(struct net *net, struct tipc_msg *msg) 
	tipc_node_unlock(n_ptr);

}



/* tipc_bclink_xmit - broadcast buffer chain to all nodes in cluster

/* tipc_bclink_xmit - deliver buffer chain to all nodes in cluster

 *                    and to identified node local sockets

 * @net: the applicable net namespace

 * @list: chain of buffers containing message
@@ -373,6 +378,8 @@ int tipc_bclink_xmit(struct net *net, struct sk_buff_head *list) 
	int rc = 0;

	int bc = 0;

	struct sk_buff *skb;

	struct sk_buff_head arrvq;

	struct sk_buff_head inputq;



	/* Prepare clone of message for local node */

	skb = tipc_msg_reassemble(list);
@@ -381,7 +388,7 @@ int tipc_bclink_xmit(struct net *net, struct sk_buff_head *list) 
		return -EHOSTUNREACH;

	}



	/* Broadcast to all other nodes */

	/* Broadcast to all nodes */

	if (likely(bclink)) {

		tipc_bclink_lock(net);

		if (likely(bclink->bcast_nodes.count)) {
@@ -401,12 +408,15 @@ int tipc_bclink_xmit(struct net *net, struct sk_buff_head *list) 
	if (unlikely(!bc))

		__skb_queue_purge(list);



	/* Deliver message clone */

	if (likely(!rc))

		tipc_sk_mcast_rcv(net, skb);

	else

	if (unlikely(rc)) {

		kfree_skb(skb);



		return rc;

	}

	/* Deliver message clone */

	__skb_queue_head_init(&arrvq);

	skb_queue_head_init(&inputq);

	__skb_queue_tail(&arrvq, skb);

	tipc_sk_mcast_rcv(net, &arrvq, &inputq);

	return rc;

}
@@ -449,6 +459,9 @@ void tipc_bclink_rcv(struct net *net, struct sk_buff *buf) 
	u32 next_in;

	u32 seqno;

	int deferred = 0;

	int pos = 0;

	struct sk_buff *iskb;

	struct sk_buff_head *arrvq, *inputq;



	/* Screen out unwanted broadcast messages */

	if (msg_mc_netid(msg) != tn->net_id)
@@ -485,6 +498,8 @@ void tipc_bclink_rcv(struct net *net, struct sk_buff *buf) 
	/* Handle in-sequence broadcast message */

	seqno = msg_seqno(msg);

	next_in = mod(node->bclink.last_in + 1);

	arrvq = &tn->bclink->arrvq;

	inputq = &tn->bclink->inputq;



	if (likely(seqno == next_in)) {

receive:
@@ -492,20 +507,26 @@ receive: 
		if (likely(msg_isdata(msg))) {

			tipc_bclink_lock(net);

			bclink_accept_pkt(node, seqno);

			spin_lock_bh(&inputq->lock);

			__skb_queue_tail(arrvq, buf);

			spin_unlock_bh(&inputq->lock);

			node->action_flags |= TIPC_BCAST_MSG_EVT;

			tipc_bclink_unlock(net);

			tipc_node_unlock(node);

			if (likely(msg_mcast(msg)))

				tipc_sk_mcast_rcv(net, buf);

			else

				kfree_skb(buf);

		} else if (msg_user(msg) == MSG_BUNDLER) {

			tipc_bclink_lock(net);

			bclink_accept_pkt(node, seqno);

			bcl->stats.recv_bundles++;

			bcl->stats.recv_bundled += msg_msgcnt(msg);

			pos = 0;

			while (tipc_msg_extract(buf, &iskb, &pos)) {

				spin_lock_bh(&inputq->lock);

				__skb_queue_tail(arrvq, iskb);

				spin_unlock_bh(&inputq->lock);

			}

			node->action_flags |= TIPC_BCAST_MSG_EVT;

			tipc_bclink_unlock(net);

			tipc_node_unlock(node);

			tipc_link_bundle_rcv(net, buf);

		} else if (msg_user(msg) == MSG_FRAGMENTER) {

			tipc_buf_append(&node->bclink.reasm_buf, &buf);

			if (unlikely(!buf && !node->bclink.reasm_buf))
@@ -521,12 +542,6 @@ receive: 
			}

			tipc_bclink_unlock(net);

			tipc_node_unlock(node);

		} else if (msg_user(msg) == NAME_DISTRIBUTOR) {

			tipc_bclink_lock(net);

			bclink_accept_pkt(node, seqno);

			tipc_bclink_unlock(net);

			tipc_node_unlock(node);

			tipc_named_rcv(net, buf);

		} else {

			tipc_bclink_lock(net);

			bclink_accept_pkt(node, seqno);
@@ -943,10 +958,11 @@ int tipc_bclink_init(struct net *net) 
	spin_lock_init(&bclink->lock);

	__skb_queue_head_init(&bcl->outqueue);

	__skb_queue_head_init(&bcl->deferred_queue);

	skb_queue_head_init(&bcl->waiting_sks);

	skb_queue_head_init(&bcl->wakeupq);

	bcl->next_out_no = 1;

	spin_lock_init(&bclink->node.lock);

	__skb_queue_head_init(&bclink->node.waiting_sks);

	__skb_queue_head_init(&bclink->arrvq);

	skb_queue_head_init(&bclink->inputq);

	bcl->owner = &bclink->node;

	bcl->owner->net = net;

	bcl->max_pkt = MAX_PKT_DEFAULT_MCAST;
@@ -954,6 +970,8 @@ int tipc_bclink_init(struct net *net) 
	bcl->bearer_id = MAX_BEARERS;

	rcu_assign_pointer(tn->bearer_list[MAX_BEARERS], &bcbearer->bearer);

	bcl->state = WORKING_WORKING;

	bcl->pmsg = (struct tipc_msg *)&bcl->proto_msg;

	msg_set_prevnode(bcl->pmsg, tn->own_addr);

	strlcpy(bcl->name, tipc_bclink_name, TIPC_MAX_LINK_NAME);

	tn->bcbearer = bcbearer;

	tn->bclink = bclink;
@@ -1032,50 +1050,3 @@ static void tipc_nmap_diff(struct tipc_node_map *nm_a, 
		}

	}

}
 


/**

 * tipc_port_list_add - add a port to a port list, ensuring no duplicates

 */

void tipc_port_list_add(struct tipc_port_list *pl_ptr, u32 port)

{

	struct tipc_port_list *item = pl_ptr;

	int i;

	int item_sz = PLSIZE;

	int cnt = pl_ptr->count;



	for (; ; cnt -= item_sz, item = item->next) {

		if (cnt < PLSIZE)

			item_sz = cnt;

		for (i = 0; i < item_sz; i++)

			if (item->ports[i] == port)

				return;

		if (i < PLSIZE) {

			item->ports[i] = port;

			pl_ptr->count++;

			return;

		}

		if (!item->next) {

			item->next = kmalloc(sizeof(*item), GFP_ATOMIC);

			if (!item->next) {

				pr_warn("Incomplete multicast delivery, no memory\n");

				return;

			}

			item->next->next = NULL;

		}

	}

}



/**

 * tipc_port_list_free - free dynamically created entries in port_list chain

 *

 */

void tipc_port_list_free(struct tipc_port_list *pl_ptr)

{

	struct tipc_port_list *item;

	struct tipc_port_list *next;



	for (item = pl_ptr->next; item; item = next) {

		next = item->next;

		kfree(item);

	}

}

net/tipc/bcast.h

+8 −21
Original line number Diff line number Diff line 
/*

 * net/tipc/bcast.h: Include file for TIPC broadcast code

 *

 * Copyright (c) 2003-2006, 2014, Ericsson AB

 * Copyright (c) 2003-2006, 2014-2015, Ericsson AB

 * Copyright (c) 2005, 2010-2011, Wind River Systems

 * All rights reserved.

 *
@@ -41,22 +41,6 @@ 
#include "link.h"

#include "node.h"



#define TIPC_BCLINK_RESET	1

#define PLSIZE			32

#define	BCBEARER		MAX_BEARERS



/**

 * struct tipc_port_list - set of node local destination ports

 * @count: # of ports in set (only valid for first entry in list)

 * @next: pointer to next entry in list

 * @ports: array of port references

 */

struct tipc_port_list {

	int count;

	struct tipc_port_list *next;

	u32 ports[PLSIZE];

};



/**

 * struct tipc_bcbearer_pair - a pair of bearers used by broadcast link

 * @primary: pointer to primary bearer
@@ -71,6 +55,9 @@ struct tipc_bcbearer_pair { 
	struct tipc_bearer *secondary;

};



#define TIPC_BCLINK_RESET	1

#define	BCBEARER		MAX_BEARERS



/**

 * struct tipc_bcbearer - bearer used by broadcast link

 * @bearer: (non-standard) broadcast bearer structure
@@ -110,6 +97,8 @@ struct tipc_bclink { 
	struct tipc_link link;

	struct tipc_node node;

	unsigned int flags;

	struct sk_buff_head arrvq;

	struct sk_buff_head inputq;

	struct tipc_node_map bcast_nodes;

	struct tipc_node *retransmit_to;

};
@@ -126,9 +115,6 @@ static inline int tipc_nmap_equal(struct tipc_node_map *nm_a, 
	return !memcmp(nm_a, nm_b, sizeof(*nm_a));

}



void tipc_port_list_add(struct tipc_port_list *pl_ptr, u32 port);

void tipc_port_list_free(struct tipc_port_list *pl_ptr);



int tipc_bclink_init(struct net *net);

void tipc_bclink_stop(struct net *net);

void tipc_bclink_set_flags(struct net *tn, unsigned int flags);
@@ -139,7 +125,7 @@ void tipc_bclink_acknowledge(struct tipc_node *n_ptr, u32 acked); 
void tipc_bclink_rcv(struct net *net, struct sk_buff *buf);

u32  tipc_bclink_get_last_sent(struct net *net);

u32  tipc_bclink_acks_missing(struct tipc_node *n_ptr);

void tipc_bclink_update_link_state(struct net *net, struct tipc_node *n_ptr,

void tipc_bclink_update_link_state(struct tipc_node *node,

				   u32 last_sent);

int  tipc_bclink_stats(struct net *net, char *stats_buf, const u32 buf_size);

int  tipc_bclink_reset_stats(struct net *net);
@@ -150,5 +136,6 @@ uint tipc_bclink_get_mtu(void); 
int tipc_bclink_xmit(struct net *net, struct sk_buff_head *list);

void tipc_bclink_wakeup_users(struct net *net);

int tipc_nl_add_bc_link(struct net *net, struct tipc_nl_msg *msg);

void tipc_bclink_input(struct net *net);



#endif

net/tipc/discover.c

+2 −1
Original line number Diff line number Diff line
@@ -85,7 +85,8 @@ static void tipc_disc_init_msg(struct net *net, struct sk_buff *buf, u32 type, 
	u32 dest_domain = b_ptr->domain;



	msg = buf_msg(buf);

	tipc_msg_init(net, msg, LINK_CONFIG, type, INT_H_SIZE, dest_domain);

	tipc_msg_init(tn->own_addr, msg, LINK_CONFIG, type,

		      INT_H_SIZE, dest_domain);

	msg_set_non_seq(msg, 1);

	msg_set_node_sig(msg, tn->random);

	msg_set_dest_domain(msg, dest_domain);

net/tipc/link.c

+129 −172
Original line number Diff line number Diff line
@@ -101,23 +101,20 @@ static const struct nla_policy tipc_nl_prop_policy[TIPC_NLA_PROP_MAX + 1] = { 
 */

#define START_CHANGEOVER 100000u



static void link_handle_out_of_seq_msg(struct net *net,

				       struct tipc_link *l_ptr,

				       struct sk_buff *buf);

static void tipc_link_proto_rcv(struct net *net, struct tipc_link *l_ptr,

				struct sk_buff *buf);

static int  tipc_link_tunnel_rcv(struct net *net, struct tipc_node *n_ptr,

				 struct sk_buff **buf);

static void link_handle_out_of_seq_msg(struct tipc_link *link,

				       struct sk_buff *skb);

static void tipc_link_proto_rcv(struct tipc_link *link,

				struct sk_buff *skb);

static int  tipc_link_tunnel_rcv(struct tipc_node *node,

				 struct sk_buff **skb);

static void link_set_supervision_props(struct tipc_link *l_ptr, u32 tol);

static void link_state_event(struct tipc_link *l_ptr, u32 event);

static void link_reset_statistics(struct tipc_link *l_ptr);

static void link_print(struct tipc_link *l_ptr, const char *str);

static void tipc_link_sync_xmit(struct tipc_link *l);

static void tipc_link_sync_rcv(struct tipc_node *n, struct sk_buff *buf);

static int tipc_link_input(struct net *net, struct tipc_link *l,

			   struct sk_buff *buf);

static int tipc_link_prepare_input(struct net *net, struct tipc_link *l,

				   struct sk_buff **buf);

static void tipc_link_input(struct tipc_link *l, struct sk_buff *skb);

static bool tipc_data_input(struct tipc_link *l, struct sk_buff *skb);



/*

 *  Simple link routines
@@ -303,7 +300,7 @@ struct tipc_link *tipc_link_create(struct tipc_node *n_ptr, 


	l_ptr->pmsg = (struct tipc_msg *)&l_ptr->proto_msg;

	msg = l_ptr->pmsg;

	tipc_msg_init(n_ptr->net, msg, LINK_PROTOCOL, RESET_MSG, INT_H_SIZE,

	tipc_msg_init(tn->own_addr, msg, LINK_PROTOCOL, RESET_MSG, INT_H_SIZE,

		      l_ptr->addr);

	msg_set_size(msg, sizeof(l_ptr->proto_msg));

	msg_set_session(msg, (tn->random & 0xffff));
@@ -319,8 +316,9 @@ struct tipc_link *tipc_link_create(struct tipc_node *n_ptr, 
	l_ptr->next_out_no = 1;

	__skb_queue_head_init(&l_ptr->outqueue);

	__skb_queue_head_init(&l_ptr->deferred_queue);

	skb_queue_head_init(&l_ptr->waiting_sks);



	skb_queue_head_init(&l_ptr->wakeupq);

	skb_queue_head_init(&l_ptr->inputq);

	skb_queue_head_init(&l_ptr->namedq);

	link_reset_statistics(l_ptr);

	tipc_node_attach_link(n_ptr, l_ptr);

	setup_timer(&l_ptr->timer, link_timeout, (unsigned long)l_ptr);
@@ -379,17 +377,16 @@ void tipc_link_delete_list(struct net *net, unsigned int bearer_id, 
static bool link_schedule_user(struct tipc_link *link, u32 oport,

			       uint chain_sz, uint imp)

{

	struct net *net = link->owner->net;

	struct tipc_net *tn = net_generic(net, tipc_net_id);

	struct sk_buff *buf;



	buf = tipc_msg_create(net, SOCK_WAKEUP, 0, INT_H_SIZE, 0, tn->own_addr,

			      tn->own_addr, oport, 0, 0);

	buf = tipc_msg_create(SOCK_WAKEUP, 0, INT_H_SIZE, 0,

			      link_own_addr(link), link_own_addr(link),

			      oport, 0, 0);

	if (!buf)

		return false;

	TIPC_SKB_CB(buf)->chain_sz = chain_sz;

	TIPC_SKB_CB(buf)->chain_imp = imp;

	skb_queue_tail(&link->waiting_sks, buf);

	skb_queue_tail(&link->wakeupq, buf);

	link->stats.link_congs++;

	return true;

}
@@ -400,17 +397,19 @@ static bool link_schedule_user(struct tipc_link *link, u32 oport, 
 * Move a number of waiting users, as permitted by available space in

 * the send queue, from link wait queue to node wait queue for wakeup

 */

static void link_prepare_wakeup(struct tipc_link *link)

void link_prepare_wakeup(struct tipc_link *link)

{

	uint pend_qsz = skb_queue_len(&link->outqueue);

	struct sk_buff *skb, *tmp;



	skb_queue_walk_safe(&link->waiting_sks, skb, tmp) {

	skb_queue_walk_safe(&link->wakeupq, skb, tmp) {

		if (pend_qsz >= link->queue_limit[TIPC_SKB_CB(skb)->chain_imp])

			break;

		pend_qsz += TIPC_SKB_CB(skb)->chain_sz;

		skb_unlink(skb, &link->waiting_sks);

		skb_queue_tail(&link->owner->waiting_sks, skb);

		skb_unlink(skb, &link->wakeupq);

		skb_queue_tail(&link->inputq, skb);

		link->owner->inputq = &link->inputq;

		link->owner->action_flags |= TIPC_MSG_EVT;

	}

}
@@ -463,13 +462,13 @@ void tipc_link_reset(struct tipc_link *l_ptr) 
		l_ptr->exp_msg_count = START_CHANGEOVER;

	}



	/* Clean up all queues: */

	/* Clean up all queues, except inputq: */

	__skb_queue_purge(&l_ptr->outqueue);

	__skb_queue_purge(&l_ptr->deferred_queue);

	if (!skb_queue_empty(&l_ptr->waiting_sks)) {

		skb_queue_splice_init(&l_ptr->waiting_sks, &owner->waiting_sks);

		owner->action_flags |= TIPC_WAKEUP_USERS;

	}

	skb_queue_splice_init(&l_ptr->wakeupq, &l_ptr->inputq);

	if (!skb_queue_empty(&l_ptr->inputq))

		owner->action_flags |= TIPC_MSG_EVT;

	owner->inputq = &l_ptr->inputq;

	l_ptr->next_out = NULL;

	l_ptr->unacked_window = 0;

	l_ptr->checkpoint = 1;
@@ -778,7 +777,7 @@ int __tipc_link_xmit(struct net *net, struct tipc_link *link, 
		} else if (tipc_msg_bundle(outqueue, skb, mtu)) {

			link->stats.sent_bundled++;

			continue;

		} else if (tipc_msg_make_bundle(net, outqueue, skb, mtu,

		} else if (tipc_msg_make_bundle(outqueue, skb, mtu,

						link->addr)) {

			link->stats.sent_bundled++;

			link->stats.sent_bundles++;
@@ -797,7 +796,7 @@ int __tipc_link_xmit(struct net *net, struct tipc_link *link, 


static void skb2list(struct sk_buff *skb, struct sk_buff_head *list)

{

	__skb_queue_head_init(list);

	skb_queue_head_init(list);

	__skb_queue_tail(list, skb);

}
@@ -843,19 +842,13 @@ int tipc_link_xmit(struct net *net, struct sk_buff_head *list, u32 dnode, 
			rc = __tipc_link_xmit(net, link, list);

		tipc_node_unlock(node);

	}



	if (link)

		return rc;



	if (likely(in_own_node(net, dnode))) {

		/* As a node local message chain never contains more than one

		 * buffer, we just need to dequeue one SKB buffer from the

		 * head list.

		 */

		return tipc_sk_rcv(net, __skb_dequeue(list));

	}

	__skb_queue_purge(list);

	if (likely(in_own_node(net, dnode)))

		return tipc_sk_rcv(net, list);



	__skb_queue_purge(list);

	return rc;

}
@@ -877,7 +870,7 @@ static void tipc_link_sync_xmit(struct tipc_link *link) 
		return;



	msg = buf_msg(skb);

	tipc_msg_init(link->owner->net, msg, BCAST_PROTOCOL, STATE_MSG,

	tipc_msg_init(link_own_addr(link), msg, BCAST_PROTOCOL, STATE_MSG,

		      INT_H_SIZE, link->addr);

	msg_set_last_bcast(msg, link->owner->bclink.acked);

	__tipc_link_xmit_skb(link, skb);
@@ -1164,7 +1157,7 @@ void tipc_rcv(struct net *net, struct sk_buff *skb, struct tipc_bearer *b_ptr) 
		/* Locate unicast link endpoint that should handle message */

		l_ptr = n_ptr->links[b_ptr->identity];

		if (unlikely(!l_ptr))

			goto unlock_discard;

			goto unlock;



		/* Verify that communication with node is currently allowed */

		if ((n_ptr->action_flags & TIPC_WAIT_PEER_LINKS_DOWN) &&
@@ -1175,7 +1168,7 @@ void tipc_rcv(struct net *net, struct sk_buff *skb, struct tipc_bearer *b_ptr) 
			n_ptr->action_flags &= ~TIPC_WAIT_PEER_LINKS_DOWN;



		if (tipc_node_blocked(n_ptr))

			goto unlock_discard;

			goto unlock;



		/* Validate message sequence number info */

		seq_no = msg_seqno(msg);
@@ -1199,18 +1192,16 @@ void tipc_rcv(struct net *net, struct sk_buff *skb, struct tipc_bearer *b_ptr) 
		if (unlikely(l_ptr->next_out))

			tipc_link_push_packets(l_ptr);



		if (released && !skb_queue_empty(&l_ptr->waiting_sks)) {

		if (released && !skb_queue_empty(&l_ptr->wakeupq))

			link_prepare_wakeup(l_ptr);

			l_ptr->owner->action_flags |= TIPC_WAKEUP_USERS;

		}



		/* Process the incoming packet */

		if (unlikely(!link_working_working(l_ptr))) {

			if (msg_user(msg) == LINK_PROTOCOL) {

				tipc_link_proto_rcv(net, l_ptr, skb);

				tipc_link_proto_rcv(l_ptr, skb);

				link_retrieve_defq(l_ptr, &head);

				tipc_node_unlock(n_ptr);

				continue;

				skb = NULL;

				goto unlock;

			}



			/* Traffic message. Conditionally activate link */
@@ -1219,18 +1210,18 @@ void tipc_rcv(struct net *net, struct sk_buff *skb, struct tipc_bearer *b_ptr) 
			if (link_working_working(l_ptr)) {

				/* Re-insert buffer in front of queue */

				__skb_queue_head(&head, skb);

				tipc_node_unlock(n_ptr);

				continue;

				skb = NULL;

				goto unlock;

			}

			goto unlock_discard;

			goto unlock;

		}



		/* Link is now in state WORKING_WORKING */

		if (unlikely(seq_no != mod(l_ptr->next_in_no))) {

			link_handle_out_of_seq_msg(net, l_ptr, skb);

			link_handle_out_of_seq_msg(l_ptr, skb);

			link_retrieve_defq(l_ptr, &head);

			tipc_node_unlock(n_ptr);

			continue;

			skb = NULL;

			goto unlock;

		}

		l_ptr->next_in_no++;

		if (unlikely(!skb_queue_empty(&l_ptr->deferred_queue)))
@@ -1240,97 +1231,102 @@ void tipc_rcv(struct net *net, struct sk_buff *skb, struct tipc_bearer *b_ptr) 
			l_ptr->stats.sent_acks++;

			tipc_link_proto_xmit(l_ptr, STATE_MSG, 0, 0, 0, 0, 0);

		}



		if (tipc_link_prepare_input(net, l_ptr, &skb)) {

			tipc_node_unlock(n_ptr);

			continue;

		}

		tipc_node_unlock(n_ptr);



		if (tipc_link_input(net, l_ptr, skb) != 0)

			goto discard;

		continue;

unlock_discard:

		tipc_link_input(l_ptr, skb);

		skb = NULL;

unlock:

		tipc_node_unlock(n_ptr);

discard:

		if (unlikely(skb))

			kfree_skb(skb);

	}

}



/**

 * tipc_link_prepare_input - process TIPC link messages

 *

 * returns nonzero if the message was consumed

/* tipc_data_input - deliver data and name distr msgs to upper layer

 *

 * Consumes buffer if message is of right type

 * Node lock must be held

 */

static int tipc_link_prepare_input(struct net *net, struct tipc_link *l,

				   struct sk_buff **buf)

static bool tipc_data_input(struct tipc_link *link, struct sk_buff *skb)

{

	struct tipc_node *n;

	struct tipc_msg *msg;

	int res = -EINVAL;

	struct tipc_node *node = link->owner;

	struct tipc_msg *msg = buf_msg(skb);

	u32 dport = msg_destport(msg);



	n = l->owner;

	msg = buf_msg(*buf);

	switch (msg_user(msg)) {

	case CHANGEOVER_PROTOCOL:

		if (tipc_link_tunnel_rcv(net, n, buf))

			res = 0;

		break;

	case MSG_FRAGMENTER:

		l->stats.recv_fragments++;

		if (tipc_buf_append(&l->reasm_buf, buf)) {

			l->stats.recv_fragmented++;

			res = 0;

		} else if (!l->reasm_buf) {

			tipc_link_reset(l);

	case TIPC_LOW_IMPORTANCE:

	case TIPC_MEDIUM_IMPORTANCE:

	case TIPC_HIGH_IMPORTANCE:

	case TIPC_CRITICAL_IMPORTANCE:

	case CONN_MANAGER:

		if (tipc_skb_queue_tail(&link->inputq, skb, dport)) {

			node->inputq = &link->inputq;

			node->action_flags |= TIPC_MSG_EVT;

		}

		break;

	case MSG_BUNDLER:

		l->stats.recv_bundles++;

		l->stats.recv_bundled += msg_msgcnt(msg);

		res = 0;

		break;

		return true;

	case NAME_DISTRIBUTOR:

		n->bclink.recv_permitted = true;

		res = 0;

		break;

		node->bclink.recv_permitted = true;

		node->namedq = &link->namedq;

		skb_queue_tail(&link->namedq, skb);

		if (skb_queue_len(&link->namedq) == 1)

			node->action_flags |= TIPC_NAMED_MSG_EVT;

		return true;

	case MSG_BUNDLER:

	case CHANGEOVER_PROTOCOL:

	case MSG_FRAGMENTER:

	case BCAST_PROTOCOL:

		tipc_link_sync_rcv(n, *buf);

		break;

		return false;

	default:

		res = 0;

	}

	return res;

		pr_warn("Dropping received illegal msg type\n");

		kfree_skb(skb);

		return false;

	};

}

/**

 * tipc_link_input - Deliver message too higher layers



/* tipc_link_input - process packet that has passed link protocol check

 *

 * Consumes buffer

 * Node lock must be held

 */

static int tipc_link_input(struct net *net, struct tipc_link *l,

			   struct sk_buff *buf)

static void tipc_link_input(struct tipc_link *link, struct sk_buff *skb)

{

	struct tipc_msg *msg = buf_msg(buf);

	int res = 0;

	struct tipc_node *node = link->owner;

	struct tipc_msg *msg = buf_msg(skb);

	struct sk_buff *iskb;

	int pos = 0;



	if (likely(tipc_data_input(link, skb)))

		return;



	switch (msg_user(msg)) {

	case TIPC_LOW_IMPORTANCE:

	case TIPC_MEDIUM_IMPORTANCE:

	case TIPC_HIGH_IMPORTANCE:

	case TIPC_CRITICAL_IMPORTANCE:

	case CONN_MANAGER:

		tipc_sk_rcv(net, buf);

	case CHANGEOVER_PROTOCOL:

		if (!tipc_link_tunnel_rcv(node, &skb))

			break;

	case NAME_DISTRIBUTOR:

		tipc_named_rcv(net, buf);

		if (msg_user(buf_msg(skb)) != MSG_BUNDLER) {

			tipc_data_input(link, skb);

			break;

		}

	case MSG_BUNDLER:

		tipc_link_bundle_rcv(net, buf);

		link->stats.recv_bundles++;

		link->stats.recv_bundled += msg_msgcnt(msg);



		while (tipc_msg_extract(skb, &iskb, &pos))

			tipc_data_input(link, iskb);

		break;

	default:

		res = -EINVAL;

	case MSG_FRAGMENTER:

		link->stats.recv_fragments++;

		if (tipc_buf_append(&link->reasm_buf, &skb)) {

			link->stats.recv_fragmented++;

			tipc_data_input(link, skb);

		} else if (!link->reasm_buf) {

			tipc_link_reset(link);

		}

	return res;

		break;

	case BCAST_PROTOCOL:

		tipc_link_sync_rcv(node, skb);

		break;

	default:

		break;

	};

}



/**
@@ -1375,14 +1371,13 @@ u32 tipc_link_defer_pkt(struct sk_buff_head *list, struct sk_buff *skb) 
/*

 * link_handle_out_of_seq_msg - handle arrival of out-of-sequence packet

 */

static void link_handle_out_of_seq_msg(struct net *net,

				       struct tipc_link *l_ptr,

static void link_handle_out_of_seq_msg(struct tipc_link *l_ptr,

				       struct sk_buff *buf)

{

	u32 seq_no = buf_seqno(buf);



	if (likely(msg_user(buf_msg(buf)) == LINK_PROTOCOL)) {

		tipc_link_proto_rcv(net, l_ptr, buf);

		tipc_link_proto_rcv(l_ptr, buf);

		return;

	}
@@ -1507,10 +1502,9 @@ void tipc_link_proto_xmit(struct tipc_link *l_ptr, u32 msg_typ, int probe_msg, 
 * Note that network plane id propagates through the network, and may

 * change at any time. The node with lowest address rules

 */

static void tipc_link_proto_rcv(struct net *net, struct tipc_link *l_ptr,

static void tipc_link_proto_rcv(struct tipc_link *l_ptr,

				struct sk_buff *buf)

{

	struct tipc_net *tn = net_generic(net, tipc_net_id);

	u32 rec_gap = 0;

	u32 max_pkt_info;

	u32 max_pkt_ack;
@@ -1522,7 +1516,7 @@ static void tipc_link_proto_rcv(struct net *net, struct tipc_link *l_ptr, 
		goto exit;



	if (l_ptr->net_plane != msg_net_plane(msg))

		if (tn->own_addr > msg_prevnode(msg))

		if (link_own_addr(l_ptr) > msg_prevnode(msg))

			l_ptr->net_plane = msg_net_plane(msg);



	switch (msg_type(msg)) {
@@ -1625,7 +1619,7 @@ static void tipc_link_proto_rcv(struct net *net, struct tipc_link *l_ptr, 


		/* Protocol message before retransmits, reduce loss risk */

		if (l_ptr->owner->bclink.recv_permitted)

			tipc_bclink_update_link_state(net, l_ptr->owner,

			tipc_bclink_update_link_state(l_ptr->owner,

						      msg_last_bcast(msg));



		if (rec_gap || (msg_probe(msg))) {
@@ -1690,7 +1684,7 @@ void tipc_link_failover_send_queue(struct tipc_link *l_ptr) 
	if (!tunnel)

		return;



	tipc_msg_init(l_ptr->owner->net, &tunnel_hdr, CHANGEOVER_PROTOCOL,

	tipc_msg_init(link_own_addr(l_ptr), &tunnel_hdr, CHANGEOVER_PROTOCOL,

		      ORIGINAL_MSG, INT_H_SIZE, l_ptr->addr);

	msg_set_bearer_id(&tunnel_hdr, l_ptr->peer_bearer_id);

	msg_set_msgcnt(&tunnel_hdr, msgcount);
@@ -1748,7 +1742,7 @@ void tipc_link_dup_queue_xmit(struct tipc_link *l_ptr, 
	struct sk_buff *skb;

	struct tipc_msg tunnel_hdr;



	tipc_msg_init(l_ptr->owner->net, &tunnel_hdr, CHANGEOVER_PROTOCOL,

	tipc_msg_init(link_own_addr(l_ptr), &tunnel_hdr, CHANGEOVER_PROTOCOL,

		      DUPLICATE_MSG, INT_H_SIZE, l_ptr->addr);

	msg_set_msgcnt(&tunnel_hdr, skb_queue_len(&l_ptr->outqueue));

	msg_set_bearer_id(&tunnel_hdr, l_ptr->peer_bearer_id);
@@ -1783,7 +1777,7 @@ void tipc_link_dup_queue_xmit(struct tipc_link *l_ptr, 
 * @from_pos: offset to extract from

 *

 * Returns a new message buffer containing an embedded message.  The

 * encapsulating message itself is left unchanged.

 * encapsulating buffer is left unchanged.

 */

static struct sk_buff *buf_extract(struct sk_buff *skb, u32 from_pos)

{
@@ -1797,12 +1791,10 @@ static struct sk_buff *buf_extract(struct sk_buff *skb, u32 from_pos) 
	return eb;

}







/* tipc_link_dup_rcv(): Receive a tunnelled DUPLICATE_MSG packet.

 * Owner node is locked.

 */

static void tipc_link_dup_rcv(struct net *net, struct tipc_link *l_ptr,

static void tipc_link_dup_rcv(struct tipc_link *l_ptr,

			      struct sk_buff *t_buf)

{

	struct sk_buff *buf;
@@ -1817,7 +1809,7 @@ static void tipc_link_dup_rcv(struct net *net, struct tipc_link *l_ptr, 
	}



	/* Add buffer to deferred queue, if applicable: */

	link_handle_out_of_seq_msg(net, l_ptr, buf);

	link_handle_out_of_seq_msg(l_ptr, buf);

}



/*  tipc_link_failover_rcv(): Receive a tunnelled ORIGINAL_MSG packet
@@ -1869,7 +1861,7 @@ exit: 
 *  returned to the active link for delivery upwards.

 *  Owner node is locked.

 */

static int tipc_link_tunnel_rcv(struct net *net, struct tipc_node *n_ptr,

static int tipc_link_tunnel_rcv(struct tipc_node *n_ptr,

				struct sk_buff **buf)

{

	struct sk_buff *t_buf = *buf;
@@ -1887,7 +1879,7 @@ static int tipc_link_tunnel_rcv(struct net *net, struct tipc_node *n_ptr, 
		goto exit;



	if (msg_type(t_msg) == DUPLICATE_MSG)

		tipc_link_dup_rcv(net, l_ptr, t_buf);

		tipc_link_dup_rcv(l_ptr, t_buf);

	else if (msg_type(t_msg) == ORIGINAL_MSG)

		*buf = tipc_link_failover_rcv(l_ptr, t_buf);

	else
@@ -1897,41 +1889,6 @@ exit: 
	return *buf != NULL;

}



/*

 *  Bundler functionality:

 */

void tipc_link_bundle_rcv(struct net *net, struct sk_buff *buf)

{

	u32 msgcount = msg_msgcnt(buf_msg(buf));

	u32 pos = INT_H_SIZE;

	struct sk_buff *obuf;

	struct tipc_msg *omsg;



	while (msgcount--) {

		obuf = buf_extract(buf, pos);

		if (obuf == NULL) {

			pr_warn("Link unable to unbundle message(s)\n");

			break;

		}

		omsg = buf_msg(obuf);

		pos += align(msg_size(omsg));

		if (msg_isdata(omsg)) {

			if (unlikely(msg_type(omsg) == TIPC_MCAST_MSG))

				tipc_sk_mcast_rcv(net, obuf);

			else

				tipc_sk_rcv(net, obuf);

		} else if (msg_user(omsg) == CONN_MANAGER) {

			tipc_sk_rcv(net, obuf);

		} else if (msg_user(omsg) == NAME_DISTRIBUTOR) {

			tipc_named_rcv(net, obuf);

		} else {

			pr_warn("Illegal bundled msg: %u\n", msg_user(omsg));

			kfree_skb(obuf);

		}

	}

	kfree_skb(buf);

}



static void link_set_supervision_props(struct tipc_link *l_ptr, u32 tol)

{

	unsigned long intv = ((tol / 4) > 500) ? 500 : tol / 4;

net/tipc/link.h

+11 −3

File changed.

Preview size limit exceeded, changes collapsed.

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